summaryrefslogtreecommitdiffstats
path: root/doc/src/stylesheet.qdoc
blob: 46ec04110627bf5b76d03807f49179883b075c63 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

/*!
    \page stylesheet.html
    \startpage index.html QtReference Documentation
    \nextpage The Style Sheet Syntax
    \title Qt Style Sheets
    \ingroup architecture
    \brief How to use style sheets to customize the appearance of widgets.

    \keyword style sheet
    \keyword stylesheet

    Qt Style Sheets are a powerful mechanism that allows you to
    customize the appearance of widgets, in addition to what is
    already possible by subclassing QStyle. The concepts,
    terminology, and syntax of Qt Style Sheets are heavily inspired
    by HTML \l{http://www.w3.org/Style/CSS/}{Cascading Style Sheets
    (CSS)} but adapted to the world of widgets.

    Topics:

    \list
    \i \l{Overview}
    \i \l{The Style Sheet Syntax}
    \tableofcontents{1 The Style Sheet Syntax}
    \i \l{Qt Designer Integration}
    \tableofcontents{1 Qt Designer Integration}
    \i \l{Customizing Qt Widgets Using Style Sheets}
    \tableofcontents{1 Customizing Qt Widgets Using Style Sheets}
    \i \l{Qt Style Sheets Reference}
    \tableofcontents{1 Qt Style Sheets Reference}
    \i \l{Qt Style Sheets Examples}
    \tableofcontents{1 Qt Style Sheets Examples}
    \endlist

    \target overview
    \section1 Overview

    Styles sheets are textual specifications that can be set on the
    whole application using QApplication::setStyleSheet() or on a
    specific widget (and its children) using
    QWidget::setStyleSheet(). If several style sheets are set at
    different levels, Qt derives the effective style sheet from all
    of those that are set. This is called cascading.

    For example, the following style sheet specifies that all
    \l{QLineEdit}s should use yellow as their background color, and
    all \l{QCheckBox}es should use red as the text color:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 0

    For this kind of customization, style sheets are much more
    powerful than QPalette. For example, it might be tempting to set
    the QPalette::Button role to red for a QPushButton to obtain a
    red push button. However, this wasn't guaranteed to work for all
    styles, because style authors are restricted by the different
    platforms' guidelines and (on Windows XP and Mac OS X) by the
    native theme engine.

    Style sheets let you perform all kinds of customizations that are
    difficult or impossible to perform using QPalette alone. If you
    want yellow backgrounds for mandatory fields, red text for
    potentially destructive push buttons, or fancy check boxes, style
    sheets are the answer.

    Style sheets are applied on top of the current \l{QStyle}{widget
    style}, meaning that your applications will look as native as
    possible, but any style sheet constraints will be taken into
    consideration. Unlike palette fiddling, style sheets offer
    guarantees: If you set the background color of a QPushButton to be
    red, you can be assured that the button will have a red background
    in all styles, on all platforms. In addition, \l{Qt Designer}
    provides style sheet integration, making it easy to view the effects
    of a style sheet in different \l{QStyle}{widget styles}.

    In addition, style sheets can be used to provide a distinctive
    look and feel for your application, without having to subclass
    QStyle. For example, you can specify arbitrary images for radio
    buttons and check boxes to make them stand out. Using this
    technique, you can also achieve minor customizations that would
    normally require subclassing several style classes, such as
    specifying a \l{QStyle::styleHint()}{style hint}. The
    \l{widgets/stylesheet}{Style Sheet} example depicted below defines
    two distinctive style sheets that you can try out and modify at
    will.

    \table
    \row \o \inlineimage stylesheet-coffee-xp.png
         \o \inlineimage stylesheet-pagefold.png
    \row \o Coffee theme running on Windows XP
         \o Pagefold theme running on Windows XP
    \endtable

    \table
    \row \o \inlineimage stylesheet-coffee-cleanlooks.png
         \o \inlineimage stylesheet-pagefold-mac.png
    \row \o Coffee theme running on Ubuntu Linux
         \o Pagefold theme running on Mac OS X
    \endtable

    When a style sheet is active, the QStyle returned by QWidget::style()
    is a wrapper "style sheet" style, \e not the platform-specific style. The
    wrapper style ensures that any active style sheet is respected and
    otherwise forwards the drawing operations to the underlying,
    platform-specific style (e.g., QWindowsXPStyle on Windows XP).

    Since Qt 4.5, Qt style sheets fully supports Mac OS X.

    \warning Qt style sheets are currently not supported for custom QStyle
    subclasses. We plan to address this in some future release.
*/

    /*!
    \page stylesheet-syntax.html
    \contentspage {Qt Style Sheet}{Contents}
    \previouspage Qt Style Sheet
    \nextpage Qt Designer Integration
    \title The Style Sheet Syntax

    Qt Style Sheet terminology and syntactic rules are almost
    identical to those of HTML CSS. If you already know CSS, you can
    probably skim quickly through this section.

    \section1 Style Rules

    Style sheets consist of a sequence of style rules. A \e{style
    rule} is made up of a selector and a declaration. The
    \e{selector} specifies which widgets are affected by the rule;
    the \e{declaration} specifies which properties should be set on
    the widget. For example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 1

    In the above style rule, \c QPushButton is the selector and \c{{
    color: red }} is the declaration. The rule specifies that
    QPushButton and its subclasses (e.g., \c MyPushButton) should use
    red as their foreground color.

    Qt Style Sheet is generally case insensitive (i.e., \c color, 
    \c Color, \c COLOR, and \c cOloR refer to the same property). 
    The only exceptions are class names,
    \l{QObject::setObjectName()}{object names}, and Qt property
    names, which are case sensitive.

    Several selectors can be specified for the same declaration,
    using commas (\c{,}) to separate the selectors. For example,
    the rule

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 2

    is equivalent to this sequence of three rules:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 3

    The declaration part of a style rule is a list of
    \tt{\e{property}: \e{value}} pairs, enclosed in braces (\c{{}})
    and separated with semicolons. For example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 4

    See the \l{List of Properties} section below for the list of
    properties provided by Qt widgets.

    \section1 Selector Types

    All the examples so far used the simplest type of selector, the
    Type Selector. Qt Style Sheets support all the
    \l{http://www.w3.org/TR/REC-CSS2/selector.html#q1}{selectors
    defined in CSS2}. The table below summarizes the most useful
    types of selectors.

    \table 100%
    \header
        \o Selector
        \o Example
        \o Explanation

    \row
        \o Universal Selector
        \o \c *
        \o Matches all widgets.

    \row
        \o Type Selector
        \o \c QPushButton
        \o Matches instances of QPushButton and of its subclasses.

    \row
        \o Property Selector
        \o \c{QPushButton[flat="false"]}
        \o Matches instances of QPushButton that are not
           \l{QPushButton::}{flat}. You may use this selector to test
           for any Qt property specified using Q_PROPERTY(). In
           addition, the special \c class property is supported, for
           the name of the class.
            
           This selector may also be used to test dynamic properties.
           For more information on customization using dynamic properties,
           refer to \l{Customizing Using Dynamic Properties}.

           Instead of \c =, you can also use \c ~= to test whether a
           Qt property of type QStringList contains a given QString.

           \warning If the value of the Qt property changes after the
           style sheet has been set, it might be necessary to force a
           style sheet recomputation. One way to achieve this is to
           unset the style sheet and set it again.

    \row
        \o Class Selector
        \o \c .QPushButton
        \o Matches instances of QPushButton, but not of its subclasses.

           This is equivalent to \c{*[class~="QPushButton"]}.

    \row
        \o ID \target ID Selector
           Selector
        \o \c{QPushButton#okButton}
        \o Matches all QPushButton instances whose
           \l{QObject::objectName}{object name} is \c okButton.

    \row
        \o Descendant Selector
        \o \c{QDialog QPushButton}
        \o Matches all instances of QPushButton that are descendants
           (children, grandchildren, etc.) of a QDialog.

    \row
        \o Child Selector
        \o \c{QDialog > QPushButton}
        \o Matches all instances of QPushButton that are direct
           children of a QDialog.
    \endtable

    \section1 Sub-Controls

    For styling complex widgets, it is necessary to access subcontrols of the
    widget, such as the drop-down button of a QComboBox or the up and down
    arrows of a QSpinBox. Selectors may contain \e{subcontrols} that make it
    possible to restrict the application of a rule to specific widget
    subcontrols. For example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 5

    The above rule styles the drop-down button of all \l{QComboBox}es.
    Although the double-colon (\c{::}) syntax is reminiscent of CSS3
    Pseudo-Elements, Qt Sub-Controls differ conceptually from these and have
    different cascading semantics.
   
    Sub-controls are always positioned with respect to another element - a
    reference element. This reference element could be the widget or another
    Sub-control. For example, the \l{Qt Style Sheets Reference#drop-down-sub}
    {::drop-down} of a QComboBox is placed, by default, in the top right corner
    of the Padding rectangle of the QComboBox. The
    \l{Qt Style Sheets Reference#drop-down-sub}{::drop-down} is placed,
    by default, in the Center of the Contents rectangle of the
    \l{Qt Style Sheets Reference#drop-down-sub}{::drop-down} Sub-control. See
    the \l{List of Stylable Widgets} below for the Sub-controls to use to
    style a widget and their default positions.

    The origin rectangle to be used can be changed using the
    \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}
    property. For example, if we want to place the drop-down in the margin
    rectangle of the QComboBox instead of the default Padding rectangle, we
    can specify:
    
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 6
    
    The alignment of the drop-down within the Margin rectangle is changed 
    using \l{Qt Style Sheets Reference#subcontrol-position-prop}
    {subcontrol-position} property.

    The \l{Qt Style Sheets Reference#width-prop}{width} and
    \l{Qt Style Sheets Reference#height-prop}{height} properties can be used
    to control the size of the Sub-control. Note that setting a
    \l{Qt Style Sheets Reference#image-prop}{image} implicitly sets the size
    of a Sub-control.

    The relative positioning scheme
    (\l{Qt Style Sheets Reference#position-prop}{position} : relative),
    allows the position of the Sub-Control to be offset from its initial
    position. For example, when the QComboBox's drop-down button is
    pressed, we might like the arrow inside to be offset to give a
    "pressed" effect. To achieve this, we can specify:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 7

    The absolute positioning scheme
    (\l{Qt Style Sheets Reference#position-prop}{position} : absolute),
    allows the position and size of the Sub-control to be changed with
    respect to the reference element.

    Once positioned, they are treated the same as widgets and can be styled
    using the \l{box model}.

    See the \l{List of Sub-Controls} below for a list of supported
    sub-controls, and \l{Customizing the QPushButton's Menu Indicator
    Sub-Control} for a realistic example.

    \note With complex widgets such as QComboBox and QScrollBar, if one
    property or sub-control is customized, \bold{all} the other properties or
    sub-controls must be customized as well.

    \section1 Pseudo-States

    Selectors may contain \e{pseudo-states} that denote that restrict
    the application of the rule based on the widget's state.
    Pseudo-states appear at the end of the selector, with a colon
    (\c{:}) in between. For example, the following rule applies when
    the mouse hovers over a QPushButton:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 8

    Pseudo-states can be negated using the exclamation operator. For
    example, the following rule applies when the mouse does not hover
    over a QRadioButton:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 9

    Pseudo-states can be chained, in which case a logical AND is
    implied. For example, the following rule applies to when the
    mouse hovers over a checked QCheckBox:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 10

    Negated Pseudo-states may appear in Pseudo-state chains. For example,
    the following rule applies when the mouse hovers over a QPushButton
    that is not pressed:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 11

    If needed, logical OR can be expressed using the comma operator:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 12

    Pseudo-states can appear in combination with subcontrols. For
    example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 13

    See the \l{List of Pseudo-States} section below for the list of
    pseudo-states provided by Qt widgets.

    \section1 Conflict Resolution

    Conflicts arise when several style rules specify the same
    properties with different values. Consider the following style
    sheet:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 14

    Both rules match QPushButton instances called \c okButton and
    there is a conflict for the \c color property. To resolve this
    conflict, we must take into account the \e specificity of the
    selectors. In the above example, \c{QPushButton#okButton} is
    considered more specific than \c QPushButton, because it
    (usually) refers to a single object, not to all instances of a
    class.

    Similarly, selectors with pseudo-states are more specific that
    ones that do not specify pseudo-states. Thus, the following style
    sheet specifies that a \l{QPushButton} should have white text
    when the mouse is hovering over it, otherwise red text:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 15

    Here's a tricky one:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 16

    Here, both selectors have the same specificity, so if the mouse
    hovers over the button while it is enabled, the second rule takes
    precedence. If we want the text to be white in that case, we can
    reorder the rules like this:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 17

    Alternatively, we can make the first rule more specific:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 18

    A similar issue arises in conjunction with Type Selectors.
    Consider the following example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 19

    Both rules apply to QPushButton instances (since QPushButton
    inherits QAbstractButton) and there is a conflict for the
    \l{Qt Style Sheets Reference#color-prop}{color} property. Because QPushButton
    inherits QAbstractButton, it might be tempting to assume that
    \c QPushButton is more specific than \c QAbstractButton. However,
    for style sheet computations, all Type Selectors have the same
    specificity, and the rule that appears last takes precedence. In
    other words, \l{Qt Style Sheets Reference#color-prop}{color} is set to \c gray
    for all \l{QAbstractButton}s, including \l{QPushButton}s. If we really
    want \l{QPushButton}s to have red text, we can always reorder the
    rules.

    For determining the specificity of a rule, Qt Style Sheets follow
    the
    \l{http://www.w3.org/TR/REC-CSS2/cascade.html#specificity}{CSS2
    Specification}:

    \quotation
    \e{A selector's specificity is calculated as follows:}

    \list
    \o \e{count the number of ID attributes in the selector (= a)}
    \o \e{count the number of other attributes and pseudo-classes in the selector (= b)}
    \o \e{count the number of element names in the selector (= c)}
    \o \e{ignore pseudo-elements [i.e., \l{subcontrols}].}
    \endlist

    \e{Concatenating the three numbers a-b-c (in a number system with a
    large base) gives the specificity.}

    \e{Some examples:}

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 20
    \endquotation

    \section1 Cascading

    Style sheets can be set on the QApplication, on parent widgets,
    and on child widgets. An arbitrary widget's effective style sheet
    is obtained by merging the style sheets set on the widget's
    ancestors (parent, grandparent, etc.), as well as any style sheet
    set on the QApplication.

    When conflicts arise, the widget's own style sheet is always
    preferred to any inherited style sheet, irrespective of the
    specificity of the conflicting rules. Likewise, the parent
    widget's style sheet is preferred to the grandparent's, etc.

    One consequence of this is that setting a style rule on a widget
    automatically gives it precedence over other rules specified in
    the ancestor widgets' style sheets or the QApplication style
    sheet. Consider the following example. First, we set a style
    sheet on the QApplication:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 21

    Then we set a style sheet on a QPushButton object:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 22

    The style sheet on the QPushButton forces the QPushButton (and
    any child widget) to have blue text, in spite of the more
    specific rule set provided by the application-wide style sheet.

    The result would have been the same if we had written

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 23

    except that if the QPushButton had children (which is unlikely),
    the style sheet would have no impact on them.

    Style sheet cascading is a complex topic. Refer to the
    \l{http://www.w3.org/TR/CSS2/cascade.html#cascade}{CSS2
    Specification} for the gory details. Be aware that Qt currently
    doesn't implement \c{!important}.

    \section1 Inheritance

    In classic CSS, when font and color of an item is not explicitly set,
    it gets automatically inherited from the parent. When using Qt Style Sheets,
    a widget does \bold{not} automatically inherit its font and color setting
    from its parent widget.

    For example, consider a QPushButton inside a QGroupBox:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 24

    The QPushButton does not have an explicit color set. Hence, instead
    of inheriting color of its parent QGroupBox, it has the system color.
    If we want to set the color on a QGroupBox and its children, 
    we can write:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 25

    In contrast, setting a font and propagate using QWidget::setFont() and
    QWidget::setPalette() propagates to child widgets.

    \section1 Widgets inside C++ namespaces
    
    The Type Selector can be used to style widgets of a particular type. For
    example,

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 26

    Qt Style Sheet uses QObject::className() of the widget to determine
    when to apply the Type Selector. When custom widgets are inside namespaces, 
    the QObject::className() returns <namespace>::<classname>. This conflicts
    with the syntax for \l{Sub-Controls}. To overcome this problem, 
    when using the Type Selector for widgets inside namespaces, we must
    replace the "::" with "--". For example,

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 27

    \section1 Setting QObject properties
    
    From 4.3 and above, any designable Q_PROPERTY 
    can be set using the qproperty-<property name> syntax.
    
    For example,
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 28

    If the property references an enum declared with Q_ENUMS, you should
    reference its constants by name, i.e., not their numeric value.

    */

    /*!
    \page stylesheet-designer.html
    \contentspage {Qt Style Sheet}{Contents}
    \previouspage The Style Sheet Syntax
    \nextpage Customizing Qt Widgets Using Style Sheets
    \title Qt Designer Integration

    \l{Qt Designer}{Qt Designer} is an excellent tool
    to preview style sheets. You can right-click on any widget in Designer
    and select \gui{Change styleSheet...} to set the style sheet.

    \image designer-stylesheet-options.png

    In Qt 4.2 and later, \l{Qt Designer}{Qt Designer} also includes a
    style sheet syntax highlighter and validator. The validator indicates
    if the syntax is valid or invalid, at the bottom left of the \gui{Edit
    Style Sheet} dialog.

    \image designer-validator-highlighter.png

    When you click \gui{OK} or \gui{Apply}, \QD will automatically display
    the widget with its new stylesheet.

    \image designer-stylesheet-usage.png
    */

    /*!
    \page stylesheet-customizing.html
    \contentspage {Qt Style Sheet}{Contents}
    \previouspage Qt Designer Integration
    \nextpage Qt Style Sheets Reference
    \title Customizing Qt Widgets Using Style Sheets

    When using style sheets, every widget is treated as a box with four
    concentric rectangles: the margin rectangle, the border rectangle, the
    padding rectangle, and the content rectangle. The box model describes
    this in further detail.

    \target box model
    \section1 The Box Model

    The four concentric rectangles appear conceptually as below:

    \image stylesheet-boxmodel.png

    \list
    \o The margin falls outside the border.
    \o The border is drawn between the margin and the padding.
    \o The padding falls inside the border, between the border and
       the actual contents.
    \o The content is what is left from the original widget or
       subcontrol once we have removed the margin, the border, and
       the padding.
    \endlist

    The \l{Qt Style Sheets Reference#margin-prop}{margin},
    \l{Qt Style Sheets Reference#border-width-prop}
    {border-width}, and
    \l{Qt Style Sheets Reference#padding-prop}{padding}
    properties all default to zero. In that case, all four rectangles
    (\c margin, \c border, \c padding, and \c content) coincide exactly.

    You can specify a background for the widget using the 
    \l{Qt Style Sheets Reference#background-image-prop}{background-image} 
    property. By default, the background-image is drawn only for the area 
    inside the border. This can be changed using the 
    \l{Qt Style Sheets Reference#background-clip-prop}{background-clip}
    property. You can use 
    \l{Qt Style Sheets Reference#background-repeat-prop}{background-repeat}
    and
    \l{Qt Style Sheets Reference#background-origin-prop}{background-origin}
    to control the repetition and origin of the background image.

    A background-image does not scale with the size of the widget. To provide
    a "skin" or background that scales along with the widget size, one must
    use
    \l{Qt Style Sheets Reference#border-image-prop}{border-image}. Since the
    border-image property provides an alternate background, it is not required
    to specify a background-image when border-image is specified. In the case,
    when both of them are specified, the border-image draws over the 
    background-image.

    In addition, the \l{Qt Style Sheets Reference#image-prop}{image} property
    may be used to draw an image over the border-image. The image specified does
    not tile or stretch and when its size does not match the size of the widget,
    its alignment is specified using the
    \l{Qt Style Sheets Reference#image-position-prop}{image-position} 
    property. Unlike background-image and border-image, one may specify a
    SVG in the image property, in which case the image is scaled automatically
    according to the widget size.

    The steps to render a rule are as follows:
        \list
        \o Set clip for entire rendering operation (border-radius)
        \o Draw the background (background-image)
        \o Draw the border (border-image, border)
        \o Draw overlay image (image)
        \endlist

    \target sub controls
    \section1 Sub-controls

    A widget is considered as a heirarchy (tree) of subcontrols drawn on top 
    of each other. For example, the QComboBox draws the drop-down sub-control
    followed by the down-arrow sub-control. A QComboBox is thus rendered as
    follows:
        \list
        \o Render the QComboBox { } rule
        \o Render the QComboBox::drop-down { } rule
        \o Render the QComboBox::down-arrow { } rule
        \endlist

    Sub-controls share a parent-child relationship. In the case of QComboBox,
    the parent of down-arrow is the drop-down and the parent of drop-down is
    the widget itself. Sub-controls are positioned within their parent using
    the \l{Qt Style Sheets Reference#subcontrol-position-prop}
    {subcontrol-position} and
    \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}
    properties.
    
    Once positioned, sub-controls can be styled using the \l{box model}.

    \note With complex widgets such as QComboBox and QScrollBar, if one
    property or sub-control is customized, \bold{all} the other properties or
    sub-controls must be customized as well.

    */

    /*!
    \page stylesheet-reference.html
    \contentspage {Qt Style Sheet}{Contents}
    \previouspage Customizing Qt Widgets Using Style Sheets
    \nextpage Qt Style Sheets Examples
    \title Qt Style Sheets Reference

    Qt Style Sheets support various properties, pseudo-states, and
    subcontrols that make it possible to customize the look of
    widgets.

    \tableofcontents

    \section1 List of Stylable Widgets

    The following table lists the Qt widgets that can be customized
    using style sheets:

    \table 100%
    \header
        \o Widget
        \o How to Style

    \row
        \o QAbstractScrollArea \target qabstractscrollarea-widget
        \o Supports the \l{box model}.

           All derivatives of QAbstractScrollArea, including QTextEdit,
           and QAbstractItemView (all item view classes), support
           scrollable backgrounds using 
           \l{Qt Style Sheets Reference#background-attachment-prop}
           {background-attachment}. Setting the background-attachment to
           \c{fixed} provides a background-image that does not scroll with the
           viewport. Setting the background-attachment to \c{scroll}, scrolls
           the background-image when the scroll bars move.

           See \l{Qt Style Sheets Examples#Customizing QAbstractScrollArea}
           {Customizing QAbstractScrollArea} for an example.

    \row
        \o QCheckBox \target qcheckbox-widget
        \o Supports the \l{box model}. The check indicator can be
           styled using the \l{#indicator-sub}{::indicator}
           subcontrol. By default, the indicator is placed in the Top
           Left corner of the Contents rectangle of the widget.

           The \l{#spacing-prop}{spacing} property
           specifies the spacing between the check indicator and
           the text.

           See \l{Qt Style Sheets Examples#Customizing QCheckBox}
           {Customizing QCheckBox} for an example.

    \row
        \o QColumnView \target qcolumnview-widget
        \o The grip can be styled be using the \l{image-prop}{image} property.
           The arrow indicators can by styled using the 
           \l{left-arrow-sub}{::left-arrow} subcontrol and the 
           \l{right-arrow-sub}{::right-arrow} subcontrol.

    \row
        \o QComboBox \target qcombobox-widget
        \o The frame around the combobox can be styled using the 
           \l{box model}. The drop-down button can be styled using
           the \l{#drop-down-sub}{::drop-down} subcontrol. By default, the
           drop-down button is placed in the top right corner of the padding
           rectangle of the widget. The arrow mark inside the drop-down button 
           can be styled using the \l{#down-arrow-sub}{::down-arrow} 
           subcontrol. By default, the arrow is placed in the center of the 
           contents rectangle of the drop-down subcontrol.

           See \l{Qt Style Sheets Examples#Customizing QComboBox}{Customizing QComboBox} 
           for an example.

    \row
        \o QDateEdit \target qdateedit-widget
        \o See \l{#qspinbox-widget}{QSpinBox}.

    \row
        \o QDateTimeEdit \target qdatetimeedit-widget
        \o See \l{#qspinbox-widget}{QSpinBox}.

    \row
        \o QDialog \target qdialog-widget
        \o Supports only the \l{Qt Style Sheets Reference#background-prop}{background},
           \l{#background-clip-prop}{background-clip} and
           \l{#background-origin-prop}{background-origin} properties.

           \warning Make sure you define the Q_OBJECT macro for your custom
           widget.

    \row
        \o QDialogButtonBox \target qdialogbuttonbox-widget
        \o The layout of buttons can be altered using the
           \l{#button-layout-prop}{button-layout} property.

    \row
        \o QDockWidget \target qdockwidget-widget
        \o Supports styling of the title bar and the title bar buttons when docked.

        The dock widget border can be styled using the \l{#border-prop}{border}
        property. The \l{#title-sub}{::title} subcontrol can be used to customize
        the title bar. The close and float buttons are positioned with respect
        to the \l{title-sub}{::title} subcontrol using the 
        \l{#close-button-sub}{::close-button} and
        \l{#float-button-sub}{::float-button} respectively.

        When the title bar is vertical, the \l{#vertical-ps}{:vertical} pseudo 
        class is set. In addition, depending on QDockWidget::DockWidgetFeature,
        the \l{#closable-ps}{:closable}, \l{#floatable-ps}{:floatable} and
        \l{#movable-ps}{:movable} pseudo states are set.

        \note Use QMainWindow::separator to style the resize handle.

        \warning The style sheet has no effect when the QDockWidget is undocked
        as Qt uses native top level windows when undocked.

        See \l{Qt Style Sheets Examples#Customizing QDockWidget}
        {Customizing QDockWidget} for an example.

    \row
        \o QDoubleSpinBox \target qdoublespinbox-widget
        \o See \l{#qspinbox-widget}{QSpinBox}.

    \row
        \o QFrame \target qframe-widget
        \o Supports the \l{box model}.

           Since 4.3, setting a stylesheet on a QLabel automatically
           sets the QFrame::frameStyle property to QFrame::StyledPanel.

           See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame}
           for an example.

    \row
        \o QGroupBox \target qgroupbox-widget
        \o Supports the \l{box model}. The title can be styled using the
           \l{#title-sub}{::title} subcontrol. By default, the title is placed
           depending on QGroupBox::textAlignment.

           In the case of a checkable QGroupBox, the title includes the
           check indicator. The indicator is styled using the 
           the \l{#indicator-sub}{::indicator} subcontrol. The 
           \l{#spacing-prop}{spacing} property can be used to control
           the spacing between the text and indicator.

           See \l{Qt Style Sheets Examples#Customizing QGroupBox}{Customizing QGroupBox}
           for an example.

    \row
        \o QHeaderView \target qheaderview-widget
        \o Supports the \l{box model}. The sections of the header view are
           styled using the \l{#section-sub}{::section} sub control. The
           \c{section} Sub-control supports the \l{#middle-ps}{:middle},
           \l{#first-ps}{:first}, \l{#last-ps}{:last}, 
           \l{#only-one-ps}{:only-one}, \l{#next-selected-ps}{:next-selected},
           \l{#previous-selected-ps}{:previous-selected}, 
           \l{#selected-ps}{:selected} pseudo states.

           Sort indicator in can be styled using the 
           \l{#up-arrow-sub}{::up-arrow} and the 
           \l{#down-arrow-sub}{::down-arrow} Sub-control.

           See \l{Qt Style Sheets Examples#Customizing QHeaderView}{Customizing QHeaderView}
           for an example.

    \row
        \o QLabel \target qlabel-widget
        \o Supports the \l{box model}. Does not support the
           \l{#hover-ps}{:hover} pseudo-state. 

           Since 4.3, setting a stylesheet on a QLabel automatically
           sets the QFrame::frameStyle property to QFrame::StyledPanel.

           See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame} for an
           example (a QLabel derives from QFrame).

    \row
        \o QLineEdit \target qlineedit-widget
        \o Support the \l{box model}.

           The color and background of the selected item is styled using
           \l{#selection-color-prop}{selection-color} and
           \l{#selection-background-color-prop}{selection-background-color}
           respectively.

           The password character can be styled using the
           \l{#lineedit-password-character-prop}{lineedit-password-character}
           property.

           See \l{Qt Style Sheets Examples#Customizing QLineEdit}{Customizing QLineEdit}
           for an example.

    \row
        \o QListView \target qlistview-widget
        \o Supports the \l{box model}. When 
           \l{QAbstractItemView::alternatingRowColors}{alternating row colors} 
           is enabled, the alternating colors can be styled using the 
           \l{#alternate-background-color-prop}{alternate-background-color}
           property.

           The color and background of the selected item is styled using
           \l{#selection-color-prop}{selection-color} and
           \l{#selection-background-color-prop}{selection-background-color}
           respectively.

           The selection behavior is controlled by the
           \l{#show-decoration-selected-prop}{show-decoration-selected} property.

           Use the \l{#item-sub}{::item} subcontrol for more fine grained
           control over the items in the QListView.

           See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to
           style scrollable backgrounds.

           See \l{Qt Style Sheets Examples#Customizing QListView}
           {Customzing QListView} for an example.

    \row
        \o QListWidget \target qlistwidget-widget
        \o See \l{#qlistview-widget}{QListView}.

    \row
        \o QMainWindow \target qmainwindow-widget
        \o Supports styling of the separator

           The separator in a QMainWindow when using QDockWidget is styled
           using the \l{#separator-sub}{::separator} subcontrol.

           See \l{Qt Style Sheets Examples#Customizing QMainWindow}{Customizing QMainWindow}
           for an example.

    \row
        \o QMenu \target qmenu-widget
        \o Supports the \l{box model}. 

           Individual items are styled using the \l{#item-sub}{::item} 
           subcontrol. In addition to the usually supported pseudo states,
           \c{item} subcontrol supports the 
           \l{#selected-ps}{:selected}, \l{#default-ps}{:default},
           \l{#exclusive-ps}{:exclusive} and the 
           \l{#non-exclusive-ps}{non-exclusive} pseudo states. 

           The indicator of checkable menu items is styled using the
           \l{#indicator-sub}{::indicator} subcontrol.

           The separator is styled using the \l{#separator-sub}{::separator}
           subcontrol.

           For items with a sub menu, the arrow marks are styled using the
           \l{::right-arrow-sub}{right-arrow} and 
           \l{::left-arrow-sub}{left-arrow}.

            The scroller is styled using the \l{#scroller-sub}{::scroller}.

            The tear-off is styled using the \l{#tear-off-sub}{::tear-off}.

           See \l{Qt Style Sheets Examples#Customizing QMenu}{Customizing QMenu}
           for an example.

    \row
        \o QMenuBar \target qmenubar-widget
        \o Supports the \l{box model}. The \l{#spacing-prop}{spacing}
           property specifies the spacing between menu items.
           Individual items are styled using the \l{#item-sub}{::item}
           subcontrol.

           \warning When running on Qt/Mac, the menu bar is usually embedded into the
           system-wide menu bar. In this case, the style sheet will have no effect.

           See \l{Qt Style Sheets Examples#Customizing QMenuBar}{Customizing QMenuBar}
           for an example.

    \row
        \o QMessageBox \target qmessagebox-widget
        \o The \l{#messagebox-text-interaction-flags-prop}
           {messagebox-text-interaction-flags} property can be used to alter
           the interaction with text in the message box.

    \row
        \o QProgressBar \target qprogressbar-widget
        \o Supports the \l{box model}. The chunks of the progress bar
           can be styled using the \l{#chunk-sub}{::chunk} subcontrol.
           The chunk is displayed on the Contents rectangle of the widget.

           If the progress bar displays text, use the \l{text-align-prop}{text-align}
           property to position the text.

           Indeterminate progress bars have the 
           \l{#indeterminate-ps}{:indeterminate} pseudo state set.

           See \l{Qt Style Sheets Examples#Customizing QProgressBar}{Customizing QProgressBar}
           for an example.

    \row
        \o QPushButton \target qpushbutton-widget
        \o Supports the \l{box model}. Supports the \l{#default-ps}{:default},
           \l{#flat-ps}{:flat}, \l{#checked-ps}{:checked} pseudo states.

           For QPushButton with a menu, the menu indicator is styled
           using the \l{#menu-indicator-sub}{::menu-indicator}
           subcontrol. Appearance of checkable push buttons can be
           customized using the \l{#open-ps}{:open} and 
           \l{#closed-ps}{:closed} pseudo-states.

           \warning If you only set a background-color on a QPushButton, the background
           may not appear unless you set the border property to some value. This is
           because, by default, the QPushButton draws a native border which completely
           overlaps the background-color. For example,

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 30

           See \l{Qt Style Sheets Examples#Customizing QPushButton}{Customizing QPushButton}
           for an example.

    \row
        \o QRadioButton \target qradiobutton-widget
        \o Supports the \l{box model}. The check indicator can be
           styled using the \l{#indicator-sub}{::indicator}
           subcontrol. By default, the indicator is placed in the Top
           Left corner of the Contents rectangle of the widget.

           The \l{#spacing-prop}{spacing} property
           specifies the spacing between the check indicator and
           the text.

           See \l{Qt Style Sheets Examples#Customizing QRadioButton}
           {Customizing QRadioButton} for an example.

    \row
        \o QScrollBar \target qscrollbar-widget
        \o Supports the \l{box model}. The Contents rectangle of the widget
           is considered to be the groove over which the slider moves. The extent
           of the QScrollBar (i.e the width or the height depending on the orientation)
           is set using the \l{#width-prop}{width} or \l{#height-prop}{height} property
           respectively. To determine the orientation, use the 
           \l{#horizontal-ps}{:horizontal} and the \l{vertical-ps}{:vertical}
           pseudo states.

           The slider can be styled using the \l{#handle-sub}{::handle} subcontrol.
           Setting the \l{#min-width-prop}{min-width} or \l{#min-height-prop}{min-height}
           provides size contraints for the slider depending on the orientation.

           The \l{add-line-sub}{::add-line} subcontrol can be used to style the
           button to add a line. By default, the add-line subcontrol is placed in 
           top right corner of the Border rectangle of the widget. Depending on the
           orientation the \l{#right-arrow-sub}{::right-arrow} or 
           \l{#down-arrow-sub}{::down-arrow}. By default, the arrows are placed in 
           the center of the Contents rectangle of the add-line subcontrol. 

           The \l{sub-line-sub}{::sub-line} subcontrol can be used to style the
           button to subtract a line. By default, the sub-line subcontrol is placed in 
           bottom right corner of the Border rectangle of the widget. Depending on the
           orientation the \l{#left-arrow-sub}{::left-arrow} or 
           \l{#up-arrow-sub}{::up-arrow}. By default, the arrows are placed in 
           the center of the Contents rectangle of the sub-line subcontrol. 

           The \l{sub-page-sub}{::sub-page} subcontrol can be used to style the
           region of the slider that subtracts a page. The \l{add-page-sub}{::add-page}
           subcontrol can be used to style the region of the slider that adds a page.

           See \l{Qt Style Sheets Examples#Customizing QScrollBar}{Customizing QScrollBar} 
           for an example.

    \row
        \o QSizeGrip \target qsizegrip-widget
        \o Supports the \l{#width-prop}{width},
           \l{#height-prop}{height}, and \l{#image-prop}{image}
           properties.

           See \l{Qt Style Sheets Examples#Customizing QSizeGrip}{Customizing QSizeGrip}
           for an example.

    \row
        \o QSlider \target qslider-widget
        \o Supports the \l{box model}. For horizontal slides, the 
           \l{min-width-prop}{min-width} and \l{height-prop}{height}
           properties must be provided. For vertical sliders, the 
           \l{min-height-prop}{min-height} and \l{width-prop}{width}
           properties must be provided.

           The groove of the slider is styled 
           using the \l{#groove-sub}{::groove}. The groove is 
           positioned by default in the Contents rectangle of the widget. 
           The thumb of the slider is styled using \l{#handle-sub}{::handle}
           subcontrol. The subcontrol moves in the Contents rectangle of
           the groove subcontrol.

           See \l{Qt Style Sheets Examples#Customizing QSlider}{Customizing QSlider}
           for an example.

    \row
        \o QSpinBox \target qspinbox-widget
        \o The frame of the spin box can be styled using the \l{box
           model}. 

           The up button and arrow can be styled using the 
           \l{#up-button-sub}{::up-button} and
           \l{#up-arrow-sub}{::up-arrow} subcontrols. By default,
           the up-button is placed in the top right corner in the 
           Padding rectangle of the widget. Without an explicit size,
           it occupies half the height of its reference rectangle.
           The up-arrow is placed in the center of the Contents
           rectangle of the up-button.

           The down button and arrow can be styled using the 
           \l{#down-button-sub}{::down-button} and
           \l{#down-arrow-sub}{::down-arrow} subcontrols. By default,
           the down-button is placed in the bottom right corner in the 
           Padding rectangle of the widget. Without an explicit size,
           it occupies half the height of its reference rectangle.
           The bottom-arrow is placed in the center of the Contents
           rectangle of the bottom-button.

           See \l{Qt Style Sheets Examples#Customizing QSpinBox}{Customizing QSpinBox}
           for an example.

    \row
        \o QSplitter \target qsplitter-widget
        \o Supports the \l{box model}. The handle of the splitter 
           is styled using the \l{#handle-sub}{::handle} subcontrol.

           See \l{Qt Style Sheets Examples#Customizing QSplitter}{Customizing QSplitter}
           for an example.

    \row
        \o QStatusBar \target qstatusbar-widget
        \o Supports only the \l{Qt Style Sheets Reference#background-prop}
           {background} property.
           The frame for individual items can be style using the
           \l{#item-sub}{::item} subcontrol.

           See \l{Qt Style Sheets Examples#Customizing QStatusBar}{Customizing QStatusBar}
           for an example.

    \row
        \o QTabBar \target qtabbar-widget
        \o Individual tabs may be styled using the \l{#tab-sub}{::tab}
           subcontrol. The tabs support the
           \l{#only-one-ps}{:only-one}, \l{#first-ps}{:first},
           \l{#last-ps}{:last}, \l{#middle-ps}{:middle},
           \l{#previous-selected-ps}{:previous--selected},
           \l{#next-selected-ps}{:next-selected},
           \l{#selected-ps}{:selected} pseudo states.

            The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right},
            \l{#bottom-ps}{:bottom} pseudo states depending on the orientation
            of the tabs.

            Overlapping tabs for the selected state are created by using
            negative margins or using the \c{absolute} position scheme.

            The tear indicator of the QTabBar is styled using the 
            \l{#tear-sub}{::tear} subcontrol.

            QTabBar used two QToolButtons for its scrollers that can be styled
            using the \c{QTabBar QToolButton} selector. To specify the width
            of the scroll button use the \l{#scroller-sub}{::scroller} 
            subcontrol.

            The alignment of the tabs within the QTabBar is styled
            using the \l{#Alignment}{alignment} property. \warning 

            To change the position of the QTabBar within a QTabWidget, use the
            \l{#tab-bar-sub}{tab-bar} subcontrol (and set subcontrol-position).

           See \l{Qt Style Sheets Examples#Customizing QTabWidget and QTabBar}{Customizing QTabBar}
           for an example.

    \row
        \o QTabWidget \target qtabwidget-widget
        \o The frame of the tab widget is styled using the 
           \l{#pane-sub}{::pane} subcontrol. The left and right
           corners are styled using the \l{#left-corner-sub}{::left-corner}
           and \l{#right-corner-sub}{::right-corner} respectively.
           The position of the tab bar is controlled using the
           \l{#tab-bar-sub}{::tab-bar} subcontrol.

           By default, the subcontrols have positions of a QTabWidget in 
           the QWindowsStyle. To place the QTabBar in the center, set the
           subcontrol-position of the tab-bar subcontrol.

            The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right},
            \l{#bottom-ps}{:bottom} pseudo states depending on the orientation
            of the tabs.

           See \l{Qt Style Sheets Examples#Customizing QTabWidget and QTabBar}
           {Customizing QTabWidget} for an example.

    \row
        \o QTableView \target qtableview-widget
        \o Supports the \l{box model}. When
           \l{QAbstractItemView::alternatingRowColors}{alternating row colors} 
           is enabled, the alternating colors can be styled using the 
           \l{#alternate-background-color-prop}{alternate-background-color}
           property.

           The color and background of the selected item is styled using
           \l{#selection-color-prop}{selection-color} and
           \l{#selection-background-color-prop}{selection-background-color}
           respectively.

           The corner widget in a QTableView is implemented as a QAbstractButton
           and can be styled using the "QTableView QTableCornerButton::section"
           selector.

           \warning If you only set a background-color on a QTableCornerButton, 
           the background may not appear unless you set the border property to 
           some value. This is because, by default, the QTableCornerButton draws a 
           native border which completely overlaps the background-color. 

           The color of the grid can be specified using the
           \l{#gridline-color-prop}{gridline-color} property.

           See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to
           style scrollable backgrounds.

           See \l{Qt Style Sheets Examples#Customizing QTableView}
           {Customzing QTableView} for an example.

    \row
        \o QTableWidget \target qtablewidget-widget
        \o See \l{#qtableview-widget}{QTableView}.

    \row
        \o QTextEdit \target qtextedit-widget
        \o Supports the \l{box model}.

           The color and background of selected text is styled using
           \l{#selection-color-prop}{selection-color} and
           \l{#selection-background-color-prop}{selection-background-color}
           respectively.

           See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to
           style scrollable backgrounds.

    \row
        \o QTimeEdit \target qtimeedit-widget
        \o See \l{#qspinbox-widget}{QSpinBox}.

    \row
        \o QToolBar \target qtoolbar-widget
        \o Supports the \l{box model}. 

           The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right},
           \l{#bottom-ps}{:bottom} pseudo states depending on the area in
           which the tool bar is grouped.

           The \l{#first-ps}{:first}, \l{#last-ps}{:last}, \l{#middle-ps}{:middle},
           \l{#only-one-ps}{:only-one} pseudo states indicator the position
           of the tool bar within a line group (See 
           QStyleOptionToolBar::positionWithinLine).

           The separator of a QToolBar is styled using the 
           \l{#separator-sub}{::separator} subcontrol.

           The handle (to move the toolbar) is styled using the
           \l{#handle-sub}{::handle} subcontrol.

           See \l{Qt Style Sheets Examples#Customizing QToolBar}{Customizing QToolBar} 
           for an example.

    \row
        \o QToolButton \target qtoolbutton-widget
        \o Supports the \l{box model}.

           If the QToolButton has a menu, is 
           \l{#menu-indicator-sub}{::menu-indicator} subcontrol can be used to
           style the indicator. By default, the menu-indicator is positioned
           at the bottom right of the Padding rectangle of the widget.

           If the QToolButton is in QToolButton::MenuButtonPopup mode,
           the \l{#menu-button-sub}{::menu-button} subcontrol is used to draw the
           menu button. \l{#menu-arrow-sub}{::menu-arrow} subcontrol is used to
           draw the menu arrow inside the menu-button. By default, it is
           positioned in the center of the Contents rectangle of the
           menu-button subcontrol.

           When the QToolButton displays arrows, the \l{#up-arrow-sub}{::up-arrow},
           \l{#down-arrow-sub}{::down-arrow}, \l{#left-arrow-sub}{::left-arrow}
           and \l{#right-arrow-sub}{::right-arrow} subcontrols are used.

           \warning If you only set a background-color on a QToolButton, the background
           will not appear unless you set the border property to some value. This is
           because, by default, the QToolButton draws a native border which completely
           overlaps the background-color. For example,

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 31

           See \l{Qt Style Sheets Examples#Customizing QToolButton}{Customizing QToolButton}
           for an example.

    \row
        \o QToolBox \target qtoolbox-widget
        \o Supports the \l{box model}. 

          The individual tabs can by styled using the 
          \l{#tab-sub}{::tab} subcontrol. The tabs support the
          \l{#only-one-ps}{:only-one}, \l{#first-ps}{:first},
          \l{#last-ps}{:last}, \l{#middle-ps}{:middle},
         \l{#previous-selected-ps}{:previous-selected},
          \l{#next-selected-ps}{:next-selected},
          \l{#selected-ps}{:selected} pseudo states.

    \row
        \o QToolTip \target qtooltip-widget
        \o Supports the \l{box model}. The \l{#opacity-prop}{opacity}
           property controls the opacity of the tooltip.

           See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame}
           for an example (a QToolTip is a QFrame).

    \row
        \o QTreeView \target qtreeview-widget
        \o Supports the \l{box model}. When 
           \l{QAbstractItemView::alternatingRowColors}{alternating row colors} 
           is enabled, the alternating colors can be styled using the 
           \l{#alternate-background-color-prop}{alternate-background-color}
           property.

           The color and background of the selected item is styled using
           \l{#selection-color-prop}{selection-color} and
           \l{#selection-background-color-prop}{selection-background-color}
           respectively.

           The selection behavior is controlled by the
           \l{#show-decoration-selected-prop}{show-decoration-selected} property.

           The branches of the tree view can be styled using the 
           \l{#branch-sub}{::branch} subcontrol. The
           ::branch Sub-control supports the \l{open-ps}{:open},
           \l{closed-ps}{:closed}, \l{has-siblings-ps}{:has-sibling} and
           \l{has-children-ps}{:has-children} pseudo states. 

           Use the \l{#item-sub}{::item} subcontrol for more fine grained
           control over the items in the QTreeView.

           See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to
           style scrollable backgrounds.

           See \l{Qt Style Sheets Examples#Customizing QTreeView}{Customizing QTreeView}
           for an example to style the branches.

    \row
        \o QTreeWidget \target qtreewidget-widget
        \o See \l{#qtreeview-widget}{QTreeView}.

    \row
        \o QWidget \target qwidget-widget
        \o Supports only the \l{Qt Style Sheets Reference#background-prop}{background},
           \l{#background-clip-prop}{background-clip} and
           \l{#background-origin-prop}{background-origin} properties.

           If you subclass from QWidget, you need to provide a paintEvent for your
           custom QWidget as below:
           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 32

           The above code is a no-operation if there is no stylesheet set.

           \warning Make sure you define the Q_OBJECT macro for your custom 
           widget.

    \endtable

    \section1 List of Properties

    The table below lists all the properties supported by Qt Style
    Sheets. Which values can be given to an property depend on the
    \l{List of Property Types}{property's type}. Unless otherwise
    specified, properties below apply to all widgets. Properties
    marked with an asterisk * are specific to Qt and have no equivalent
    in CSS2 or CSS3.

    \table 100%
    \header
        \o Property
        \o Type
        \o Description

    \row
        \o \bold{\c alternate-background-color} \target alternate-background-color-prop
        \o \l{#Brush}{Brush} \BR
        \o The \l{QAbstractItemView::alternatingRowColors}
           {alternate background color} used in QAbstractItemView subclasses.

           If this property is not set, the default value is
           whatever is set for the palette's
           \l{QPalette::}{AlternateBase} role.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 33

           See also \l{Qt Style Sheets Reference#background-prop}{background} and
           \l{#selection-background-color-prop}{selection-background-color}.

    \row
        \o \bold{\c background} \target background-prop
        \o \l{#Background}{Background}
        \o Shorthand notation for setting the background. Equivalent
           to specifying \c background-color, \c background-image, \c
           background-repeat, and/or \c background-position.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QDialog, QFrame, QGroupBox, QLabel, QLineEdit,
           QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter,
           QTextEdit, QToolTip, and plain \l{QWidget}s.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 34


           Often, it is required to set a fill pattern similar to the styles
           in Qt::BrushStyle. You can use the background-color property for
           Qt::SolidPattern, Qt::RadialGradientPattern, Qt::LinearGradientPattern
           and Qt::ConicalGradientPattern.  The other patterns are easily achieved 
           by creating a background image that contains the pattern.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 35

           See also \l{#background-origin-prop}{background-origin},
           \l{#selection-background-color-prop}{selection-background-color},
           \l{#background-clip-prop}{background-clip},
           \l{#background-attachment-prop}{background-attachment}
           and \l{#alternate-background-color-prop}{alternate-background-color}.

    \row
        \o \c background-color \target background-color-prop
        \o \l{#Brush}{Brush} \BR
        \o The background color used for the widget.

           Examples:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 36

    \row
        \o \c background-image \target background-image-prop
        \o \l{#Url}{Url}
        \o The background image used for the widget. Semi-transparent
           parts of the image let the \c background-color shine
           through.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 37

    \row
        \o \c background-repeat \target background-repeat-prop
        \o \l{#Repeat}{Repeat}
        \o Whether and how the background image is repeated to fill
           the \c background-origin rectangle.

           If this property is not specified, the background image
           is repeated in both directions (\c repeat).

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 38

    \row
        \o \c background-position
        \o \l{#Alignment}{Alignment}
        \o The alignment of the background image within the \c
           background-origin rectangle.

           If this property is not specified, the alignment is \c
           top \c left.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 39

    \row
        \o \bold{\c background-attachment} \target background-attachment-prop
        \o \l{#Attachment}{Attachment}
        \o Determines whether the background-image in a QAbstractScrollArea
           is scrolled or fixed with respect to the viewport.
           By default, the background-image scrolls with the viewport.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 40

        See also \l{Qt Style Sheets Reference#background-prop}{background}

    \row
        \o \bold{\c background-clip} \target background-clip-prop
        \o \l{#Origin}{Origin}
        \o The widget's rectangle, in which the \c background is drawn.

           This property specifies the rectangle to which the \c background-color
           and \c background-image are clipped.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QDialog, QFrame, QGroupBox, QLabel,
           QPushButton, QRadioButton, QSplitter, QTextEdit, QToolTip,
           and plain \l{QWidget}s.

           If this property is not specified, the default is \c
           border.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 41

           See also \l{Qt Style Sheets Reference#background-prop}{background}, 
           \l{#background-origin-prop}{background-origin} and \l{The Box Model}.

    \row
        \o \bold{\c background-origin} \target background-origin-prop
        \o \l{#Origin}{Origin}
        \o The widget's background rectangle, to use in conjunction
           with \c background-position and \c background-image.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QDialog, QFrame, QGroupBox, QLabel,
           QPushButton, QRadioButton, QSplitter, QTextEdit, QToolTip,
           and plain \l{QWidget}s.

           If this property is not specified, the default is \c
           padding.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 42

           See also \l{Qt Style Sheets Reference#background-prop}{background} and
           \l{The Box Model}.

    \row
        \o \bold{\c border} \target border-prop
        \o \l{#Border}{Border}
        \o Shorthand notation for setting the widget's border. Equivalent
           to specifying \c border-color, \c border-style, and/or
           \c border-width.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QDialog, QFrame, QGroupBox, QLabel, QLineEdit,
           QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter,
           QTextEdit, QToolTip, and plain \l{QWidget}s.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 43

    \row
        \o \c border-top
        \o \l{#Border}{Border}
        \o Shorthand notation for setting the widget's top border.
           Equivalent to specifying \c border-top-color, \c
           border-top-style, and/or \c border-top-width.

    \row
        \o \c border-right
        \o \l{#Border}{Border}
        \o Shorthand notation for setting the widget's right border.
           Equivalent to specifying \c border-right-color, \c
           border-right-style, and/or \c border-right-width.

    \row
        \o \c border-bottom
        \o \l{#Border}{Border}
        \o Shorthand notation for setting the widget's bottom border.
           Equivalent to specifying \c border-bottom-color, \c
           border-bottom-style, and/or \c border-bottom-width.

    \row
        \o \c border-left
        \o \l{#Border}{Border}
        \o Shorthand notation for setting the widget's left border.
           Equivalent to specifying \c border-left-color, \c
           border-left-style, and/or \c border-left-width.

    \row
        \o \bold{\c border-color} \target border-attrs
           \target border-color-prop
        \o \l{#Box Colors}{Box Colors}
        \o The color of all the border's edges. Equivalent to
           specifying \c border-top-color, \c border-right-color, \c
           border-bottom-color, and \c border-left-color.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QDialog, QFrame, QGroupBox, QLabel, QLineEdit,
           QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter,
           QTextEdit, QToolTip, and plain \l{QWidget}s.

           If this property is not specified, it defaults to
           \l{#color-prop}{color} (i.e., the widget's foreground
           color).

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 44

           See also \l{Qt Style Sheets Reference#border-style-prop}{border-style},
           \l{Qt Style Sheets Reference#border-width-prop}{border-width},
           \l{#border-image-prop}{border-image}, and \l{The Box Model}.

    \row
        \o \c border-top-color
        \o \l{#Brush}{Brush} \BR
        \o The color of the border's top edge.

    \row
        \o \c border-right-color
        \o \l{#Brush}{Brush} \BR
        \o The color of the border's right edge.

    \row
        \o \c border-bottom-color
        \o \l{#Brush}{Brush} \BR
        \o The color of the border's bottom edge.

    \row
        \o \c border-left-color
        \o \l{#Brush}{Brush} \BR
        \o The color of the border's left edge.

    \row
        \o \bold{\c border-image} \target border-image-prop
        \o \l{#Border Image}{Border Image}
        \o The image used to fill the border. The image is cut into
           nine parts and stretched appropriately if necessary. See
           \l{#Border Image}{Border Image} for details.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QDialog, QFrame, QGroupBox, QLabel, QLineEdit,
           QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter,
           QTextEdit and QToolTip.

           See also \l{#border-color-prop}{border-color},
           \l{Qt Style Sheets Reference#border-style-prop}{border-style},
           \l{Qt Style Sheets Reference#border-width-prop}{border-width}, and
           \l{The Box Model}.

    \row
        \o \bold{\c border-radius} \target border-radius-prop
        \o \l{#Radius}{Radius}
        \o The radius of the border's corners. Equivalent to
           specifying \c border-top-left-radius, \c
           border-top-right-radius, \c border-bottom-right-radius,
           and \c border-bottom-left-radius.

           The border-radius clips the element's 
           \l{Qt Style Sheets Reference#background-prop}{background}.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
           and QToolTip.

           If this property is not specified, it defaults to 0.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 45

           See also \l{Qt Style Sheets Reference#border-width-prop}{border-width} and
           \l{The Box Model}.

    \row
        \o \c border-top-left-radius
        \o \l{#Radius}{Radius}
        \o The radius of the border's top-left corner.

    \row
        \o \c border-top-right-radius
        \o \l{#Radius}{Radius}
        \o The radius of the border's top-right corner.

    \row
        \o \c border-bottom-right-radius
        \o \l{#Radius}{Radius}
        \o The radius of the border's bottom-right corner. Setting
           this property to a positive value results in a rounded
           corner.

    \row
        \o \c border-bottom-left-radius
        \o \l{#Radius}{Radius}
        \o The radius of the border's bottom-left corner. Setting this
           property to a positive value results in a rounded corner.

    \row
        \o \bold{\c border-style} \target border-style-prop
        \o \l {Border Style}
        \o The style of all the border's edges.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
           and QToolTip.

           If this property is not specified, it defaults to \c none.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 46

           See also \l{#border-color-prop}{border-color},
           \l{Qt Style Sheets Reference#border-style-prop}{border-style},
           \l{#border-image-prop}{border-image}, and \l{The Box Model}.

    \row
        \o \c border-top-style
        \o \l{#Border Style}{Border Style}
        \o The style of the border's top edge.

    \row
        \o \c border-right-style
        \o \l{#Border Style}{Border Style}
        \o The style of the border's right edge/

    \row
        \o \c border-bottom-style
        \o \l{#Border Style}{Border Style}
        \o The style of the border's bottom edge.

    \row
        \o \c border-left-style
        \o \l{#Border Style}{Border Style}
        \o The style of the border's left edge.

    \row
        \o \bold{\c border-width} \target border-width-prop
        \o \l{#Box Lengths}{Box Lengths}
        \o The width of the border. Equivalent to setting \c
           border-top-width, \c border-right-width, \c
           border-bottom-width, and \c border-left-width.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
           and QToolTip.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 47

           See also \l{#border-color-prop}{border-color},
           \l{#border-radius-prop}{border-radius},
           \l{Qt Style Sheets Reference#border-style-prop}{border-style},
           \l{#border-image-prop}{border-image}, and
           \l{The Box Model}.

    \row
        \o \c border-top-width
        \o \l{#Length}{Length}
        \o The width of the border's top edge.

    \row
        \o \c border-right-width
        \o \l{#Length}{Length}
        \o The width of the border's right edge.

    \row
        \o \c border-bottom-width
        \o \l{#Length}{Length}
        \o The width of the border's bottom edge.

    \row
        \o \c border-left-width
        \o \l{#Length}{Length}
        \o The width of the border's left edge.

    \row
        \o \bold{\c bottom} \target bottom-prop
        \o \l{#Length}{Length}
        \o If \l{#position-prop}{position} is \c relative (the
           default), moves a \l{subcontrol} by a certain offset up;
           specifying \tt{bottom: \e{y}} is then equivalent to
           specifying \tt{\l{Qt Style Sheets Reference#top-prop}{top}: -\e{y}}.

           If \l{#position-prop}{position} is \c absolute, the \c
           bottom property specifies the subcontrol's bottom edge
           in relation to the parent's bottom edge (see also
           \l{Qt Style Sheets Reference#subcontrol-origin-prop}
           {subcontrol-origin}).

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 48

           See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{#right-prop}{right}, and
           \l{Qt Style Sheets Reference#top-prop}{top}.

    \row
        \o \bold{\c button-layout} \target button-layout-prop
        \o \l{#Number}{Number}
        \o The layout of buttons in a QDialogButtonBox or
           a QMessageBox. The possible values are 0
           (\l{QDialogButtonBox::}{WinLayout}), 1
           (\l{QDialogButtonBox::}{MacLayout}), 2
           (\l{QDialogButtonBox::}{KdeLayout}), and 3
           (\l{QDialogButtonBox::}{GnomeLayout}).

           If this property is not specified, it defaults to the
           value specified by the current style for the
           \l{QStyle::}{SH_DialogButtonLayout} style hint.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 49

    \row
        \o \bold{\c color} \target color-prop
        \o \l{#Brush}{Brush} \BR 
        \o The color used to render text.

           This property is supported by all widgets that respect
           the \l QWidget::palette.

           If this property is not set, the default is whatever is
           set for in the widget's palette for the
           QWidget::foregroundRole (typically black).

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 50

           See also \l{Qt Style Sheets Reference#background-prop}{background} and
           \l{#selection-color-prop}{selection-color}.

    \row
        \o \bold{\c dialogbuttonbox-buttons-have-icons}
        \o \l{#Boolean}{Boolean}
        \o Whether the buttons in a QDialogButtonBox show icons

        If this property is set to 1, the buttons of a QDialogButtonBox
        show icons; if it is set to 0, the icons are not shown.

        See the \l{Qt Style Sheets Reference#list of icons}{List of Icons}
        section for information on how to set icons.

        \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 51

        \note Styles defining this property must be applied before the
        QDialogButtonBox is created; this means that you must apply the
        style to the parent widget or to the application itself.

    \omit
    \row
        \o \bold{\c etch-disabled-text}*
        \o \l{#Boolean}{Boolean}
        \o Whether disabled text is drawn etched.

           If this property is not specified, it defaults to the
           value specified by the current style for the
           \l{QStyle::}{SH_EtchDisabledText} style hint.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 52
    \endomit

    \row
        \o \bold{\c font} \target font-prop
        \o \l{#Font}{Font}
        \o Shorthand notation for setting the text's font. Equivalent
           to specifying \c font-family, \c font-size, \c font-style,
           and/or \c font-weight.

           This property is supported by all widgets that respect
           the \l QWidget::font.

           If this property is not set, the default is the
           QWidget::font.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 53

    \row
        \o \c font-family
        \o String
        \o The font family.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 54

    \row
        \o \c font-size
        \o \l{#Font Size}{Font Size}
        \o The font size. In this version of Qt, only pt and px metrics are 
           supported.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 55

    \row
        \o \c font-style
        \o \l {Font Style}
        \o The font style.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 56

    \row
        \o \c font-weight
        \o \l{#Font Weight}{Font Weight}
        \o The weight of the font.

    \row
        \o \bold{\c gridline-color}* \target gridline-color-prop
        \o \l{#Color}{Color} \BR
        \o The color of the grid line in a QTableView.

           If this property is not specified, it defaults to the
           value specified by the current style for the
           \l{QStyle::}{SH_Table_GridLineColor} style hint.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 57

    \row
        \o \bold{\c height} \target height-prop
        \o \l{#Length}{Length}
        \o The height of a \l{subcontrol} (or in some case, a widget).

           If this property is not specified, it defaults to a value
           that depends on the subcontrol/widget and on the current style.

           \warning Unless otherwise specified, this property has no effect 
           when set on widgets. If you want a widget with a fixed height, set
           the \l{#min-width-prop}{min-height} and 
           \l{#max-width-prop}{max-height} to the same value.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 58

           See also \l{#width-prop}{width}.

    \row
        \o \bold{\c icon-size} \target icon-size-prop
        \o \l{#Length}{Length}
        \o The width and height of the icon in a widget.

           The icon size of the following widgets can be set using this 
           property.
               \list
               \i QCheckBox
               \i QListView
               \i QPushButton
               \i QRadioButton
               \i QTabBar
               \i QToolBar
               \i QToolBox
               \i QTreeView
               \endlist

    \row
        \o \bold{\c image}* \target image-prop
        \o \l{#Url}{Url}+
        \o The image that is drawn in the contents rectangle of a 
           \l{subcontrol}. 

           The image property accepts a list of \l{#Url}{Url}s or 
           an \c{svg}. The actual image that is drawn is determined
           using the same algorithm as QIcon (i.e) the image is never scaled
           up but always scaled down if necessary. If a \c{svg} is specified,
           the image is scaled to the size of the contents rectangle.

           Setting the image property on sub controls implicitly sets the 
           width and height of the sub-control (unless the image in a SVG).

           In Qt 4.3 and later, the alignment of the
           image within the rectangle can be specified using 
           \l{image-position-prop}{image-position}.

           \warning The QIcon SVG plugin is needed to render SVG images.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 59

    \row
        \o \bold{\c image-position} \target image-position-prop
        \o \l{#Alignment}{alignment}
        \o In Qt 4.3 and later, the alignment of the image image's position can be specified
           using relative or absolute position.

    \row
        \o \bold{\c left} \target left-prop
        \o \l{#Length}{Length}
        \o If \l{#position-prop}{position} is \c relative (the
           default), moves a \l{subcontrol} by a certain offset to
           the right.

           If \l{#position-prop}{position} is \c absolute, the \c
           left property specifies the subcontrol's left edge in
           relation to the parent's left edge (see also
           \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}).

           If this property is not specified, it defaults to \c 0.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 60

           See also \l{#right-prop}{right}, \l{Qt Style Sheets Reference#top-prop}{top}, and
           \l{#bottom-prop}{bottom}.

    \row
        \o \bold{\c lineedit-password- \BR \c character}* \target lineedit-password-character-prop
        \o \l{#Number}{Number}
        \o The QLineEdit password character as a Unicode number.

           If this property is not specified, it defaults to the
           value specified by the current style for the
           \l{QStyle::}{SH_LineEdit_PasswordCharacter} style hint.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 61

    \row
        \o \bold{\c margin} \target margin-prop
        \o \l {Box Lengths}
        \o The widget's margins. Equivalent to specifying \c
           margin-top, \c margin-right, \c margin-bottom, and \c
           margin-left.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
           and QToolTip.

           If this property is not specified, it defaults to \c 0.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 62

           See also \l{Qt Style Sheets Reference#padding-prop}{padding},
           \l{#spacing-prop}{spacing}, and \l{The Box Model}.

    \row
        \o \c margin-top
        \o \l{#Length}{Length}
        \o The widget's top margin.

    \row
        \o \c margin-right
        \o \l{#Length}{Length}
        \o The widget's right margin.

    \row
        \o \c margin-bottom
        \o \l{#Length}{Length}
        \o The widget's bottom margin.

    \row
        \o \c margin-left
        \o \l{#Length}{Length}
        \o The widget's left margin.

    \row
        \o \bold{\c max-height} \target max-height-prop
        \o \l{#Length}{Length}
        \o The widget's or a subcontrol's maximum height.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox,
           QSplitter, QStatusBar, QTextEdit, and QToolTip.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 63

           See also \l{#max-width-prop}{max-width}.

    \row
        \o \bold{\c max-width} \target max-width-prop
        \o \l{#Length}{Length}
        \o The widget's or a subcontrol's maximum width.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox,
           QSplitter, QStatusBar, QTextEdit, and QToolTip.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 64

           See also \l{#max-height-prop}{max-height}.


    \row
        \o \bold{\c messagebox-text- \target messagebox-text-interaction-flags-prop
           \BR \c interaction-flags}*
        \o \l{#Number}{Number}
        \o The interaction behavior for text in a message box.
           Possible values are based on Qt::TextInteractionFlags.

           If this property is not specified, it defaults to the
           value specified by the current style for the
           \l{QStyle::}{SH_MessageBox_TextInteractionFlags} style
           hint.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 65

    \row
        \o \bold{\c min-height} \target min-height-prop
        \o \l{#Length}{Length}
        \o The widget's or a subcontrol's minimum height.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox,
           QSplitter, QStatusBar, QTextEdit, and QToolTip.

           If this property is not specified, the minimum height is
           derived based on the widget's contents and the style.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 66

           See also \l{#min-width-prop}{min-width}.

    \row
        \o \bold{\c min-width} \target min-width-prop
        \o \l{#Length}{Length}
        \o The widget's or a subcontrol's minimum width.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox,
           QSplitter, QStatusBar, QTextEdit, and QToolTip.

           If this property is not specified, the minimum width is
           derived based on the widget's contents and the style.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 67

           See also \l{#min-height-prop}{min-height}.

    \row
        \o \bold{\c opacity}* \target opacity-prop
        \o \l{#Number}{Number}
        \o The opacity for a widget. Possible values are from 0
           (transparent) to 255 (opaque). For the moment, this is
           only supported for \l{QToolTip}{tooltips}.

           If this property is not specified, it defaults to the
           value specified by the current style for the
           \l{QStyle::}{SH_ToolTipLabel_Opacity} style hint.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 68

    \row
        \o \bold{\c padding} \target padding-prop
        \o \l{#Box Lengths}{Box Lengths}
        \o The widget's padding. Equivalent to specifying \c
           padding-top, \c padding-right, \c padding-bottom, and \c
           padding-left.

           This property is supported by QAbstractItemView
           subclasses, QAbstractSpinBox subclasses, QCheckBox,
           QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
           QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
           and QToolTip.

           If this property is not specified, it defaults to \c 0.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 69

           See also \l{#margin-prop}{margin},
           \l{#spacing-prop}{spacing}, and \l{The Box Model}.

    \row
        \o \c padding-top
        \o \l{#Length}{Length}
        \o The widget's top padding.

    \row
        \o \c padding-right
        \o \l{#Length}{Length}
        \o The widget's right padding.

    \row
        \o \c padding-bottom
        \o \l{#Length}{Length}
        \o The widget's bottom padding.

    \row
        \o \c padding-left
        \o \l{#Length}{Length}
        \o The widget's left padding.

    \row
        \o \bold{\c paint-alternating-row-colors-for-empty-area} 
            \target paint-alternating-row-colors-for-empty-area-prop
        \o \c bool
        \o Whether the QTreeView paints alternating row colors for the empty 
           area (i.e the area where there are no items)

    \row
        \o \bold{\c position} \target position-prop
        \o \c relative \BR
           | \c absolute
        \o Whether offsets specified using \l{Qt Style Sheets Reference#left-prop}{left},
           \l{#right-prop}{right}, \l{Qt Style Sheets Reference#top-prop}{top}, and
           \l{#bottom-prop}{bottom} are relative or absolute
           coordinates.

           If this property is not specified, it defaults to \c
           relative.

    \row
        \o \bold{\c right} \target right-prop
        \o \l{#Length}{Length}
        \o If \l{#position-prop}{position} is \c relative (the
           default), moves a \l{subcontrol} by a certain offset to
           the left; specifying \tt{right: \e{x}} is then equivalent
           to specifying \tt{\l{Qt Style Sheets Reference#left-prop}{left}: -\e{x}}.

           If \l{#position-prop}{position} is \c absolute, the \c
           right property specifies the subcontrol's right edge in
           relation to the parent's right edge (see also
           \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}).

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 70

           See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{Qt Style Sheets Reference#top-prop}{top}, and
           \l{#bottom-prop}{bottom}.

    \row
        \o \bold{\c selection-background-color}* \target selection-background-color-prop
        \o \l{#Brush}{Brush} \BR
        \o The background of selected text or items.

           This property is supported by all widgets that respect
           the \l QWidget::palette and that show selection text.

           If this property is not set, the default value is
           whatever is set for the palette's
           \l{QPalette::}{Highlight} role.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 71

           See also \l{#selection-color-prop}{selection-color} and
           \l{Qt Style Sheets Reference#background-prop}{background}.

    \row
        \o \bold{\c selection-color}* \target selection-color-prop
        \o \l{#Brush}{Brush} \BR
        \o The foreground of selected text or items.

           This property is supported by all widgets that respect
           the \l QWidget::palette and that show selection text.

           If this property is not set, the default value is
           whatever is set for the palette's
           \l{QPalette::}{HighlightedText} role.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 72

           See also
           \l{#selection-background-color-prop}{selection-background-color}
           and \l{#color-prop}{color}.

    \row
        \o \bold{\c show-decoration- \target show-decoration-selected-prop
           \BR \c selected}*
        \o \l{#Boolean}{Boolean}
        \o Controls whether selections in a QListView cover the
           entire row or just the extent of the text.

           If this property is not specified, it defaults to the
           value specified by the current style for the
           \l{QStyle::}{SH_ItemView_ShowDecorationSelected} style
           hint.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 73

    \row
        \o \bold{\c spacing}* \target spacing-prop
        \o \l{#Length}{Length}
        \o Internal spacing in the widget.

           This property is supported by QCheckBox, checkable
           \l{QGroupBox}es, QMenuBar, and QRadioButton.

           If this property is not specified, the default value
           depends on the widget and on the current style.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 74

           See also \l{Qt Style Sheets Reference#padding-prop}{padding} and
           \l{#margin-prop}{margin}.

    \row
        \o \bold{\c subcontrol-origin}* \target subcontrol-origin-prop
        \o \l{#Origin}{Origin}
        \o The origin rectangle of the \l subcontrol within the
           parent element.

           If this property is not specified, the default is \c
           padding.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 75

           See also
           \l{Qt Style Sheets Reference#subcontrol-position-prop}{subcontrol-position}.

    \row
        \o \bold{\c subcontrol-position}* \target subcontrol-position-prop
        \o \l{#Alignment}{Alignment}
        \o The alignment of the \l subcontrol within the origin
           rectangle specified by \l{Qt Style Sheets Reference#subcontrol-origin-prop}
           {subcontrol-origin}.

           If this property is not specified, it defaults to a value
           that depends on the subcontrol.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 76

           See also
           \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}.

    \row
        \o \bold{\c text-align} \target text-align-prop
        \o \l{#Alignment}{Alignment}
        \o The alignment of text and icon within the contents of the widget.

           If this value is not specified, it defaults to the value
           that depends on the native style.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 77

            This property is currently supported only by QPushButton 
            and QProgressBar.

    \row    
        \o \bold{\c text-decoration}
        \o \c none \BR
           \c underline \BR
           \c overline \BR
           \c line-through
        \o Additional text effects

    \row
        \o \bold{\c top} \target top-prop
        \o \l{#Length}{Length}
        \o If \l{#position-prop}{position} is \c relative (the
           default), moves a \l{subcontrol} by a certain offset
           down.

           If \l{#position-prop}{position} is \c absolute, the \c top
           property specifies the subcontrol's top edge in relation
           to the parent's top edge (see also
           \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}).

           If this property is not specified, it defaults to \c 0.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 78

           See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{#right-prop}{right}, and
           \l{#bottom-prop}{bottom}.

    \row
        \o \bold{\c width} \target width-prop
        \o \l{#Length}{Length}
        \o The width of a \l{subcontrol} (or a widget in some cases).

           If this property is not specified, it defaults to a value
           that depends on the subcontrol/widget and on the current style.

           \warning Unless otherwise specified, this property has no effect 
           when set on widgets. If you want a widget with a fixed width, set
           the \l{#min-width-prop}{min-width} and 
           \l{#max-width-prop}{max-width} to the same value.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 79

           See also \l{#height-prop}{height}.

    \endtable

    \target list of icons
    \section1 List of Icons

    Icons used in Qt can be customized using the following properties. Each of
    the properties listed in this section have the type \l{#Icon}{Icon}.

    Note that for icons to appear in buttons in a QDialogButtonBox, you need to
    set the dialogbuttonbox-buttons-have-icons property to true. Also, to
    customize the size of the icons, use the icon-size property.

    \table 100%
    \header
        \o Name
        \o QStyle::StandardPixmap

    \row
        \o backward-icon
        \o QStyle::SP_ArrowBack

    \row
        \o cd-icon
        \o QStyle::SP_DriveCDIcon

    \row
        \o computer-icon
        \o QStyle::SP_ComputerIcon

    \row
        \o desktop-icon
        \o QStyle::SP_DesktopIcon

    \row
        \o dialog-apply-icon
        \o QStyle::SP_DialogApplyButton

    \row
        \o dialog-cancel-icon
        \o QStyle::SP_DialogCancelButton

    \row
        \o dialog-close-icon
        \o QStyle::SP_DialogCloseButton

    \row
        \o dialog-discard-icon
        \o QStyle::SP_DialogDiscardButton

    \row
        \o dialog-help-icon
        \o QStyle::SP_DialogHelpButton

    \row
        \o dialog-no-icon
        \o QStyle::SP_DialogNoButton

    \row
        \o dialog-ok-icon
        \o QStyle::SP_DialogOkButton

    \row
        \o dialog-open-icon
        \o QStyle::SP_DialogOpenButton

    \row
        \o dialog-reset-icon
        \o QStyle::SP_DialogResetButton

    \row
        \o dialog-save-icon
        \o QStyle::SP_DialogSaveButton

    \row
        \o dialog-yes-icon
        \o QStyle::SP_DialogYesButton

    \row
        \o directory-closed-icon
        \o QStyle::SP_DirClosedIcon

    \row
        \o directory-icon
        \o QStyle::SP_DirIcon

    \row
        \o directory-link-icon
        \o QStyle::SP_DirLinkIcon

    \row
        \o directory-open-icon
        \o QStyle::SP_DirOpenIcon

    \row
        \o dockwidget-close-icon
        \o QStyle::SP_DockWidgetCloseButton

    \row
        \o downarrow-icon
        \o QStyle::SP_ArrowDown

    \row
        \o dvd-icon
        \o QStyle::SP_DriveDVDIcon

    \row
        \o file-icon
        \o QStyle::SP_FileIcon

    \row
        \o file-link-icon
        \o QStyle::SP_FileLinkIcon

    \omit
    \row
        \o filedialog-backward-icon
        \o QStyle::SP_FileDialogBack
    \endomit

    \row
        \o filedialog-contentsview-icon
        \o QStyle::SP_FileDialogContentsView

    \row
        \o filedialog-detailedview-icon
        \o QStyle::SP_FileDialogDetailedView

    \row
        \o filedialog-end-icon
        \o QStyle::SP_FileDialogEnd

    \row
        \o filedialog-infoview-icon
        \o QStyle::SP_FileDialogInfoView

    \row
        \o filedialog-listview-icon
        \o QStyle::SP_FileDialogListView

    \row
        \o filedialog-new-directory-icon
        \o QStyle::SP_FileDialogNewFolder

    \row
        \o filedialog-parent-directory-icon
        \o QStyle::SP_FileDialogToParent

    \row
        \o filedialog-start-icon
        \o  QStyle::SP_FileDialogStart

    \row
        \o floppy-icon
        \o QStyle::SP_DriveFDIcon

    \row
        \o forward-icon
        \o QStyle::SP_ArrowForward

    \row
        \o harddisk-icon
        \o QStyle::SP_DriveHDIcon

    \row
        \o home-icon
        \o QStyle::SP_DirHomeIcon

    \row
        \o leftarrow-icon
        \o QStyle::SP_ArrowLeft

    \row
        \o messagebox-critical-icon
        \o QStyle::SP_MessageBoxCritical

    \row
        \o messagebox-information-icon
        \o QStyle::SP_MessageBoxInformation

    \row
        \o messagebox-question-icon
        \o QStyle::SP_MessageBoxQuestion

    \row
        \o messagebox-warning-icon
        \o QStyle::SP_MessageBoxWarning

    \row
        \o network-icon
        \o QStyle::SP_DriveNetIcon

    \row
        \o rightarrow-icon
        \o QStyle::SP_ArrowRight

    \row
        \o titlebar-contexthelp-icon
        \o QStyle::SP_TitleBarContextHelpButton

    \row
        \o titlebar-maximize-icon
        \o QStyle::SP_TitleBarMaxButton

    \row
        \o titlebar-menu-icon
        \o QStyle::SP_TitleBarMenuButton

    \row
        \o titlebar-minimize-icon
        \o QStyle::SP_TitleBarMinButton

    \row
        \o titlebar-normal-icon
        \o QStyle::SP_TitleBarNormalButton

    \row
        \o titlebar-shade-icon
        \o QStyle::SP_TitleBarShadeButton

    \row
        \o titlebar-unshade-icon
        \o QStyle::SP_TitleBarUnshadeButton

    \row
        \o trash-icon
        \o QStyle::SP_TrashIcon

    \row
        \o uparrow-icon
        \o QStyle::SP_ArrowUp

    \endtable

    \section1 List of Property Types

    The following table summarizes the syntax and meaning of the
    different property types.

    \table 100%
    \header
        \o Type
        \o Syntax
        \o Description

    \row
        \o \bold Alignment \target Alignment
        \o \{ \c top \BR
           | \c bottom \BR
           | \c left \BR
           | \c right \BR
           | \c center \}*
        \o Horizontal and/or vertical alignment.

           Example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 80

    \row
        \o \bold Attachment \target Attachment
        \o \{ \c scroll \BR
           | \c fixed \}*
        \o Scroll or fixed attachment.

    \row
        \o \bold Background \target Background
        \o \{ \l{#Brush}{Brush} \BR
           | \l{#Url}{Url} \BR
           | \l{#Repeat}{Repeat} \BR
           | \l{#Alignment}{Alignment} \}*
        \o A sequence of \l{#Brush}{Brush}, \l{#Url}{Url},
           \l{#Repeat}{Repeat}, and \l{#Alignment}{Alignment}.

    \row
        \o \bold Boolean \target Boolean
        \o 0 | 1
        \o True (\c 1) or false (\c 0).

           Example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 81

    \row
        \o \bold Border \target Border
        \o \{ \l{#Border Style}{Border Style} \BR
           | \l{#Length}{Length} \BR
           | \l{#Brush}{Brush} \}*
        \o Shorthand border property.

    \row
        \o \bold{Border \target Border Image
           Image}
        \o \c none \BR
           | \l{Url} \l{Number}\{4\} \BR (\c stretch | \c repeat){0,2}
        \o A border image is an image that is composed of nine parts
           (top left, top center, top right, center left, center,
           center right, bottom left, bottom center, and bottom
           right). When a border of a certain size is required, the
           corner parts are used as is, and the top, right, bottom,
           and left parts are stretched or repeated to produce a
           border with the desired size.

           See the
           \l{http://www.w3.org/TR/css3-background/#the-border-image}
           {CSS3 Draft Specification} for details.

    \row
        \o \bold{Border \target Border Style
           Style}
        \o \c dashed \BR
           | \c dot-dash \BR
           | \c dot-dot-dash \BR
           | \c dotted \BR
           | \c double \BR
           | \c groove \BR
           | \c inset \BR
           | \c outset \BR
           | \c ridge \BR
           | \c solid \BR
           | \c none
        \o Specifies the pattern used to draw a border.
           See the \l{http://www.w3.org/TR/css3-background/#border-style}
           {CSS3 Draft Specification} for details.

    \row
        \o \bold{Box \target Box Colors 
        Colors}
        \o \l{#Brush}{Brush}\{1,4\}
        \o One to four occurrences of \l{#Brush}{Brush}, specifying the top,
           right, bottom, and left edges of a box, respectively. If
           the left color is not specified, it is taken to be the
           same as the right color. If the bottom color is not
           specified, it is taken to be the same as the top color. If
           the right color is not specified, it is taken to be the
           same as the top color.

           Example:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 82

    \row
        \o \bold{Box \target Box Lengths
           Lengths}
        \o \l{#Length}{Length}\{1,4\}
        \o One to four occurrences of \l{#Length}{Length}, specifying the
           top, right, bottom, and left edges of a box,
           respectively. If the left length is not specified, it is
           taken to be the same as the right length. If the bottom
           length is not specified, is it taken to be the same as the
           top length. If the right length is not specified, it is
           taken to be the same as the top length.

           Examples:

           \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 83

    \row
        \o \bold Brush \target Brush
        \o \l{#Color}{Color} \BR
           | \l{Gradient} \BR
           | \l{PaletteRole}
        \o Specifies a Color or a Gradient or an entry in the Palette.

    \row
        \o \bold Color \target Color
        \o \tt{rgb(\e{r}, \e{g}, \e{b})} \BR
           | \tt{rgba(\e{r}, \e{g}, \e{b}, \e{a})} \BR
           | \tt{hsv(\e{h}, \e{s}, \e{v})} \BR
           | \tt{hsva(\e{h}, \e{s}, \e{v}, \e{a})} \BR
           | \tt{#\e{rrggbb}} \BR
           | \l{QColor::setNamedColor()}{Color Name} \BR
        \o Specifies a color as RGB (red, green, blue) or RGBA
           (red, green, blue, alpha) or HSV (hue, saturation, value) or HSVA 
           (hue, saturation, value, alpha) or a named color. The \c rgb() or \c rgba()
           syntax can be used with integer values between 0 and 255, or with
           percentages. The value of s, v, and a in \c hsv() or \c hsva() must all 
           be in the range 0-255; the value of h must be in the range 0-359.

           Examples:

            \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 84

            \note The RGB colors allowed are the same as those allowed with
            CSS 2.1, as listed
            \l{http://www.w3.org/TR/CSS21/syndata.html#color-units}{here}. 

    \row
        \o \bold Font \target Font
        \o (\l{#Font Style}{Font Style} | \l{#Font Weight}{Font Weight}){0,2} \l{#Font Size}{Font Size} String
        \o Shorthand font property.

    \row
        \o \bold{Font \target Font Size
           Size}
        \o \l{Length}
        \o The size of a font.

    \row
        \o \bold{Font \target Font Style
           Style}
        \o \c normal \BR
           | \c italic \BR
           | \c oblique
        \o The style of a font.

    \row
        \o \bold{Font \target Font Weight
           Weight}
        \o \c normal \BR
           | \c bold \BR
           | \c 100 \BR
           | \c 200 \BR
           ... \BR
           | \c 900
        \o The weight of a font.

    \row
        \o \bold Gradient \target Gradient
        \o \c qlineargradient \BR
           | \c qradialgradient \BR
           | \c qconicalgradient
        \o Specifies gradient fills. There are three types of gradient fills:

           \list
           \o \e{Linear} gradients interpolate colors between start and
              end points.
           \o \e{Radial} gradients interpolate colors between a focal
              point and end points on a circle surrounding it.
           \o \e{Conical} gradients interpolate colors around a center
              point.
           \endlist

        Gradients are specified in Object Bounding Mode. Imagine the box 
        in which the gradient is rendered, to have its top left corner at (0, 0)
        and its bottom right corner at (1, 1). Gradient parameters are
        then specified as percentages from 0 to 1. These values are 
        extrapolated to actual box coordinates at runtime. It is possible
        specify values that lie outside the bounding box (-0.6 or 1.8, for
        instance).

        \warning The stops have to appear sorted in ascending order.

        Examples:

        \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 85

    \row
        \o \bold Icon \target Icon
        \o (\l{#Url}{Url} (\c disabled | \c active | \c normal | \c selected)?
            (\c on | \c off)? )*
        \o A list of url, QIcon::Mode and QIcon::State.

            Example:
            \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 86

    \row
        \o \bold Length \target Length
        \o \l{#Number}{Number} (\c px | \c pt | \c em | \c ex)?
        \o A number followed by a measurement unit. The CSS standard recommends
           that user agents must 
           \l{http://www.w3.org/TR/CSS21/syndata.html#illegalvalues}{ignore}
           a declaration with an illegal value. In Qt, it is mandatory to 
           specify measurement units. For compatibility with earlier versions 
           of Qt, numbers without measurement units are treated as pixels 
           in most contexts. The supported units are:

           \list
           \o \c px: pixels
           \o \c pt: the size of one point (i.e., 1/72 of an inch)
           \o \c em: the em width of the font (i.e., the width of 'M')
           \o \c ex: the ex width of the font (i.e., the height of 'x')
           \endlist

    \row
        \o \bold Number \target Number
        \o A decimal integer or a real number
        \o Examples: \c 0, \c 18, \c +127, \c -255, \c 12.34, \c -.5,
           \c 0009.

    \row
        \o \bold Origin \target Origin
        \o \c margin \BR
           | \c border \BR
           | \c padding \BR
           | \c content
        \o Indicates which of four rectangles to use.

           \list
           \o \c margin: The margin rectangle. The margin falls outside the border.
           \o \c border: The border rectangle. This is where any border is drawn.
           \o \c padding: The padding rectangle. Unlike the margins,
                          padding is located inside the border.
           \o \c content: The content rectangle. This specifies where
                          the actual contents go, excluding any
                          padding, border, or margin.
           \endlist

           See also \l{The Box Model}.

    \row
        \o \bold PaletteRole \target PaletteRole
        \o \c alternate-base \BR
              | \c base \BR
              | \c bright-text \BR
              | \c button \BR
              | \c button-text \BR
              | \c dark \BR
              | \c highlight \BR
              | \c highlighted-text \BR
              | \c light \BR
              | \c link \BR
              | \c link-visited \BR
              | \c mid \BR
              | \c midlight \BR
              | \c shadow \BR
              | \c text \BR
              | \c window \BR
              | \c window-text \BR
        \o These values correspond the \l{QPalette::ColorRole}{Color roles} 
           in the widget's QPalette.

            For example,
            \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 87

    \row
        \o \bold Radius \target Radius
        \o \l{#Length}{Length}\{1, 2\}
        \o One or two occurrences of \l{#Length}{Length}. If only one length is
           specified, it is used as the radius of the quarter circle
           defining the corner. If two lengths are specified, the
           first length is the horizontal radius of a quarter
           ellipse, whereas the second length is the vertical radius.

    \row
        \o \bold Repeat \target Repeat
        \o \c repeat-x \BR
           | \c repeat-y \BR
           | \c repeat \BR
           | \c no-repeat
        \o A value indicating the nature of repetition.

           \list
           \o \c repeat-x: Repeat horizontally.
           \o \c repeat-y: Repeat vertically.
           \o \c repeat: Repeat horizontally and vertically.
           \o \c no-repeat: Don't repeat.
           \endlist

    \row
        \o \bold Url \target Url
        \o \tt{url(\e{filename})}
        \o \tt{\e{filename}} is the name of a file on the local disk
           or stored using \l{the Qt Resource System}. Setting an
           image implicitly sets the width and height of the element.

    \endtable

    \section1 List of Pseudo-States

    The following pseudo-states are supported:

    \table 100%
    \header
        \o Pseudo-State
        \o Description

    \row \o \c :active \target active
          \o This state is set when the widget resides in an active window.

    \row
        \o \c :adjoins-item \target adjoins-item-ps
        \o This state is set when the \l{#branch-sub}{::branch} of a QTreeView
           is adjacent to an item.

    \row
        \o \c :alternate \target alternate-ps
        \o This state is set for every alternate row whe painting the row of
           a QAbstractItemView when QAbstractItemView::alternatingRowColors()
           is  set to true.

    \row
        \o \c :bottom \target bottom-ps
        \o The item is positioned at the bottom. For example, a QTabBar
           that has its tabs positioned at the bottom.

    \row
        \o \c :checked \target checked-ps
        \o The item is checked. For example, the 
            \l{QAbstractButton::checked}{checked} state of QAbstractButton.

    \row
        \o \c :closable \target closable-ps
        \o The items can be closed. For example, the QDockWidget has the
           QDockWidget::DockWidgetClosable feature turned on.

    \row
        \o \c :closed \target closed-ps
        \o The item is in the closed state. For example, an non-expanded 
           item in a QTreeView

    \row
        \o \c :default \target default-ps
        \o The item is the default. For example, a 
           \l{QPushButton::default}{default} QPushButton or a default action
           in a QMenu.

    \row
        \o \c :disabled \target disabled-ps
        \o The item is \l{QWidget::enabled}{disabled}.

    \row
        \o \c :editable \target editable-ps
        \o The QComboBox is editable.

    \row
        \o \c :edit-focus \target edit-focus-ps
        \o The item has edit focus (See QStyle::State_HasEditFocus). This state 
           is available only for Qt Extended applications.

    \row
        \o \c :enabled \target enabled-ps
        \o The item is \l{QWidget::enabled}{enabled}.

    \row
        \o \c :exclusive \target exclusive-ps
        \o The item is part of an exclusive item group. For example, a menu
           item in a exclusive QActionGroup.

    \row
        \o \c :first \target first-ps
        \o The item is the first (in a list). For example, the first
           tab in a QTabBar.

    \row
        \o \c :flat \target flat-ps
        \o The item is flat. For example, a
           \l{QPushButton::flat}{flat} QPushButton.

    \row
        \o \c :floatable \target floatable-ps
        \o The items can be floated. For example, the QDockWidget has the
           QDockWidget::DockWidgetFloatable feature turned on.

    \row
        \o \c :focus \target focus-ps
        \o The item has \l{QWidget::hasFocus()}{input focus}.

    \row
        \o \c :has-children \target has-children-ps
        \o The item has children. For example, an item in a
           QTreeView that has child items.

    \row
        \o \c :has-siblings \target has-siblings-ps
        \o The item has siblings. For example, an item in a
           QTreeView that siblings.

    \row
        \o \c :horizontal \target horizontal-ps
        \o The item has horizontal orientation

    \row
        \o \c :hover \target hover-ps
        \o The mouse is hovering over the item.

    \row
        \o \c :indeterminate \target indeterminate-ps
        \o The item has indeterminate state. For example, a QCheckBox 
           or QRadioButton is \l{Qt::PartiallyChecked}{partially checked}.

    \row
        \o \c :last \target last-ps
        \o The item is the last (in a list). For example, the last
           tab in a QTabBar.

    \row
        \o \c :left \target left-ps
        \o The item is positioned at the left. For example, a QTabBar
           that has its tabs positioned at the left.

    \row
        \o \c :maximized \target maximized-ps
        \o The item is maximized. For example, a maximized QMdiSubWindow.

    \row
        \o \c :middle \target middle-ps
        \o The item is in the middle (in a list). For example, a tab
           that is not in the beginning or the end in a QTabBar.

    \row
        \o \c :minimized \target minimized-ps
        \o The item is minimized. For example, a minimized QMdiSubWindow.

    \row
        \o \c :movable \target movable-ps
        \o The item can be moved around. For example, the QDockWidget has the
           QDockWidget::DockWidgetMovable feature turned on.

    \row
        \o \c :no-frame \target no-frame-ps
        \o The item has no frame. For example, a frameless QSpinBox
           or QLineEdit.

    \row
        \o \c :non-exclusive \target non-exclusive-ps
        \o The item is part of a non-exclusive item group. For example, a menu
           item in a non-exclusive QActionGroup.

    \row
        \o \c :off \target off-ps
        \o For items that can be toggled, this applies to items
           in the "off" state.

    \row
        \o \c :on \target on-ps
        \o For items that can be toggled, this applies to widgets
           in the "on" state. 

    \row
        \o \c :only-one \target only-one-ps
        \o The item is the only one (in a list). For example, a lone tab
           in a QTabBar.

    \row
        \o \c :open \target open-ps
        \o The item is in the open state. For example, an expanded 
           item in a QTreeView, or a QComboBox or QPushButton with
           an open menu.

    \row
        \o \c :next-selected \target next-selected-ps
        \o The next item (in a list) is selected. For example, the
           selected tab of a QTabBar is next to this item.

    \row
        \o \c :pressed \target pressed-ps
        \o The item is being pressed using the mouse.

    \row
        \o \c :previous-selected \target previous-selected-ps
        \o The previous item (in a list) is selected. For example, a
           tab in a QTabBar that is next to the selected tab.

    \row
        \o \c :read-only \target read-only-ps
        \o The item is marked read only or non-editable. For example,
           a read only QLineEdit or a non-editable QComboBox.

    \row
        \o \c :right \target right-ps
        \o The item is positioned at the right. For example, a QTabBar
           that has its tabs positioned at the right.

    \row 
        \o \c :selected \target selected-ps
        \o The item is selected. For example, the selected tab in
           a QTabBar or the selected item in a QMenu.

    \row
        \o \c :top \target top-ps
        \o The item is positioned at the top. For example, a QTabBar
           that has its tabs positioned at the top.

    \row
        \o \c :unchecked \target unchecked-ps
        \o The item is
           \l{QAbstractButton::checked}{unchecked}.

    \row
        \o \c :vertical \target vertical-ps
        \o The item has vertical orientation.

    \row
        \o \c :window \target window-ps
        \o The widget is a window (i.e top level widget)

    \endtable

    \target subcontrols
    \section1 List of Sub-Controls

    The following subcontrols are available:

    \table 100%
    \header
        \o Sub-Control
        \o Description

    \row
        \o \c ::add-line \target add-line-sub
        \o The button to add a line of a QScrollBar.

    \row
        \o \c ::add-page \target add-page-sub
        \o The region between the handle (slider) and the \l{#add-line-sub}{add-line}
           of a QScrollBar.

    \row
        \o \c ::branch \target branch-sub
        \o The branch indicator of a QTreeView.

    \row
        \o \c ::chunk \target chunk-sub
        \o The progress chunk of a QProgressBar.

    \row
        \o \c ::close-button \target close-button-sub
        \o The close button of a QDockWidget.

    \row
        \o \c ::corner \target corner-sub
        \o The corner between two scrollbars in a QAbstractScrollArea

    \row
        \o \c ::down-arrow \target down-arrow-sub
        \o The down arrow of a QComboBox, QHeaderView (sort indicator),
           QScrollBar or QSpinBox.

    \row
        \o \c ::down-button \target down-button-sub
        \o  The down button of a QScrollBar or a QSpinBox.

    \row
        \o \c ::drop-down \target drop-down-sub
        \o The drop-down button of a QComboBox.

    \row
        \o \c ::float-button \target float-button-sub
        \o The float button of a QDockWidget

    \row
        \o \c ::groove \target groove-sub
        \o The groove of a QSlider.

    \row
        \o \c ::indicator \target indicator-sub
        \o The indicator of a QAbstractItemView, a QCheckBox, a QRadioButton, 
           a checkable QMenu item or a checkable QGroupBox.

    \row
        \o \c ::handle \target handle-sub
        \o The handle (slider) of a QScrollBar, a QSplitter, or a QSlider.

    \row
        \o \c ::icon \target icon-sub
        \o The icon of a QAbstractItemView or a QMenu.

    \row
        \o \c ::item \target item-sub
        \o An item of a QAbstractItemView, a QMenuBar, a QMenu, or 
        a QStatusBar.

    \row
        \o \c ::left-arrow \target left-arrow-sub
        \o The left arrow of a QScrollBar.

    \row
        \o \c ::left-corner \target left-corner-sub
        \o The left corner of a QTabWidget. For example, this control can be
           used to control position the left corner widget in a QTabWidget.

    \row
        \o \c ::menu-arrow \target menu-arrow-sub
        \o The arrow of a QToolButton with a menu.

    \row
        \o \c ::menu-button \target menu-button-sub
        \o The menu button of a QToolButton.

    \row
        \o \c ::menu-indicator \target menu-indicator-sub
        \o The menu indicator of a QPushButton.

    \row
        \o \c ::right-arrow \target right-arrow-sub
        \o The right arrow of a QMenu or a QScrollBar.

    \row
        \o \c ::pane \target pane-sub
        \o The pane (frame) of a QTabWidget.

    \row
        \o \c ::right-corner \target right-corner-sub
        \o The right corner of a QTabWidget. For example, this control can be
           used to control the position the right corner widget in a QTabWidget.

    \row
        \o \c ::scroller \target scroller-sub
        \o The scroller of a QMenu or QTabBar.

    \row
        \o \c ::section \target section-sub
        \o The section of a QHeaderView.

    \row
        \o \c ::separator \target separator-sub
        \o The separator of a QMenu or in a QMainWindow.

    \row
        \o \c ::sub-line \target sub-line-sub
        \o The button to subtract a line of a QScrollBar.

    \row
        \o \c ::sub-page \target sub-page-sub
        \o The region between the handle (slider) and the \l{#sub-line-sub}{sub-line}
           of a QScrollBar.

    \row
        \o \c ::tab \target tab-sub
        \o The tab of a QTabBar or QToolBox.

    \row
        \o \c ::tab-bar \target tab-bar-sub
        \o The tab bar of a QTabWidget. This subcontrol exists only to
           control the position of the QTabBar inside the QTabWidget. To
           style the tabs using the \l{#tab-sub}{::tab} subcontrol.

    \row
        \o \c ::tear \target tear-sub
        \o The tear indicator of a QTabBar.

    \row
        \o \c ::tear-off \target tear-off-sub
        \o The tear-off indicator of a QMenu.

    \row
        \o \c ::text \target text-ps
        \o The text of a QAbstractItemView.

    \row
        \o \c ::title \target title-sub
        \o The title of a QGroupBox or a QDockWidget.

    \row
        \o \c ::up-arrow \target up-arrow-sub
        \o The up arrow of a QHeaderView (sort indicator), QScrollBar 
           or a QSpinBox.

    \row
        \o \c ::up-button \target up-button-sub
        \o The up button of a QSpinBox.

    \endtable

    See \l{Customizing the QPushButton's Menu Indicator Sub-Control}
    for an example of how to customize a subcontrol.
    */

    /*!
    \page stylesheet-examples.html
    \contentspage {Qt Style Sheet}{Contents}
    \previouspage Qt Style Sheets Reference
    \title Qt Style Sheets Examples

    \tableofcontents
    \section1 Style Sheet Usage

    We will now see a few examples to get started with using Qt Style Sheets.

    \section2 Customizing the Foreground and Background Colors

    Let's start by setting yellow as the background color of all
    \l{QLineEdit}s in an application. This could be achieved like
    this:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 88

    If we want the property to apply only to the \l{QLineEdit}s that are
    children (or grandchildren or grand-grandchildren) of a specific dialog,
    we would rather do this:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 89

    If we want the property to apply only to one specific QLineEdit,
    we can give it a name using QObject::setObjectName() and use an
    ID Selector to refer to it:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 90

    Alternatively, we can set the
    \l{Qt Style Sheets Reference#background-prop}{background-color} property directly on the
    QLineEdit, omitting the selector:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 91

    To ensure a good contrast, we should also specify a suitable
    color for the text:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 92

    It might be a good idea to change the colors used for selected
    text as well:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 93


    \section2 Customizing Using Dynamic Properties

    There are many situations where we need to present a form that
    has mandatory fields. To indicate to the user that the field is
    mandatory, one effective (albeit esthetically dubious) solution
    is to use yellow as the background color for those fields. It
    turns out this is very easy to implement using Qt Style Sheets.
    First, we would use the following application-wide style sheet:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 94

    This means that every widget whose \c mandatoryField Qt property
    is set to true would have a yellow background.

    Then, for each mandatory field widget, we would simply create a
    \c mandatoryField property on the fly and set it to true. For
    example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 95

    \section2 Customizing a QPushButton Using the Box Model

    This time, we will show how to create a red QPushButton. This
    QPushButton would presumably be connected to a very destructive
    piece of code.

    First, we are tempted to use this style sheet:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 96

    However, the result is a boring, flat button with no borders:

    \image stylesheet-redbutton1.png A flat red button

    What happened is this:

    \list
    \o We have made a request that cannot be satisfied using the
       native styles alone (e.g., the Windows XP theme engine doesn't
       let us specify the background color of a button).
    \o Therefore, the button is rendered using style sheets.
    \o We haven't specified any values for
       \l{Qt Style Sheets Reference#border-width-prop}{border-width} and
       \l{Qt Style Sheets Reference#border-style-prop}{border-style}, so by default we obtain
       a 0-pixel wide border of style \c none.
    \endlist

    Let's improve the situation by specifying a border:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 97

    \image stylesheet-redbutton2.png A red button with a beige border

    Things look already a lot better. But the button looks a bit
    cramped. Let's specify some spacing between the border and the
    text using the \l{Qt Style Sheets Reference#padding-prop}{padding}. Additionally, we will
    enforce a minimum width, round the corners, and specify a larger
    font to make the button look nicer:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 98

    \image stylesheet-redbutton3.png A red button with a round beige border and big, bold text

    The only issue remaining is that the button doesn't react when we
    press it. We can fix this by specifying a slightly different
    background color and use a different border style.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 99

    \section2 Customizing the QPushButton's Menu Indicator Sub-Control

    Subcontrols give access to the sub-elements of a widget. For
    example, a QPushButton associated with a menu (using
    QPushButton::setMenu()) has a menu indicator. Let's customize
    the menu indicator for the red push button:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 100

    By default, the menu indicator is located at the bottom-right
    corner of the padding rectangle. We can change this by specifying
    \l{Qt Style Sheets Reference#subcontrol-position-prop}{subcontrol-position} and
    \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin} to anchor the
    indicator differently. We can also use \l{Qt Style Sheets Reference#top-prop}{top} and
    \l{Qt Style Sheets Reference#left-prop}{left} to move the indicator by a few pixels. For
    example:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 101

    This positions the \c myindicator.png to the center right of the
    QPushButton's \l{Qt Style Sheets Reference#padding-prop}{padding} rectangle (see
    \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin} for more
    information).

    \section2 Complex Selector Example

    Since red seems to be our favorite color, let's make the text in
    QLineEdit red by setting the following application-wide
    stylesheet:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 102

    However, we would like to give a visual indication that a
    QLineEdit is read-only by making it appear gray:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 103

    At some point, our design team comes with the requirement that
    all \l{QLineEdit}s in the registration form (with the
    \l{QObject::objectName}{object name} \c registrationDialog) to be
    brown:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 104

    A few UI design meetings later, we decide that all our
    \l{QDialog}s should have brown colored \l{QLineEdit}s:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 105

    Quiz: What happens if we have a read-only QLineEdit in a QDialog?
    [Hint: The \l{The Style Sheet Syntax#Conflict Resolution}{Conflict Resolution} section above explains
    what happens in cases like this.]

    \section1 Customizing specific widgets

    This section provides examples to customize specific widgets using Style Sheets.

    \section2 Customizing QAbstractScrollArea

    The background of any QAbstractScrollArea (Item views, QTextEdit 
    and QTextBrowser) can be set using the background properties. For example,
    to set a background-image that scrolls with the scroll bar:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 106

    If the background-image is to be fixed with the viewport:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 107

    \section2 Customizing QCheckBox

    Styling of a QCheckBox is almost indentical to styling a QRadioButton. The
    main difference is that a tristate QCheckBox has an indeterminate state.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 108

    \section2 Customizing QComboBox

    We will look at an example where the drop down button of a QComboBox
    appears "merged" with the combo box frame.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 109

    The pop-up of the QComboBox is a QAbstractItemView and is styled using 
    the descendant selector:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 110

    \section2 Customizing QDockWidget

    The title bar and the buttons of a QDockWidget can be customized as 
    follows:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 111

    If one desires to move the dock widget buttons to the left, the following
    style sheet can be used:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 112

    \note To customize the separator (resize handle) of a QDockWidget,
    use QMainWindow::separator.

    \section2 Customizing QFrame

    A QFrame is styled using the \l{The Box Model}.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 113

    \section2 Customizing QGroupBox
    
    Let us look at an example that moves the QGroupBox's title to
    the center.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 114

    For a checkable QGroupBox, use the \{#indicator-sub}{::indicator} subcontrol
    and style it exactly like a QCheckBox (i.e)

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 115

    \section2 Customizing QHeaderView

    QHeaderView is customized as follows:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 116

    \section2 Customizing QLineEdit

    The frame of a QLineEdit is styled using the \l{The Box Model}. To
    create a line edit with rounded corners, we can set:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 117

    The password character of line edits that have QLineEdit::Password
    echo mode can be set using:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 118

    The background of a read only QLineEdit can be modified as below:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 119

    \section2 Customizing QListView

    The background color of alternating rows can be customized using the following
    style sheet:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 120

    To provide a special background when you hover over items, we can use the
    \l{item-sub}{::item} subcontrol. For example,

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 121

    \section2 Customizing QMainWindow

    The separator of a QMainWindow can be styled as follows:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 122

    \section2 Customizing QMenu
    
    Individual items of a QMenu are styled using the 'item' subcontrol as 
    follows:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 123

    For a more advanced customization, use a style sheet as follows:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 124

    \section2 Customizing QMenuBar

    QMenuBar is styled as follows:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 125

    \section2 Customizing QProgressBar

    The QProgressBar's \l{stylesheet-reference.html#border-prop}{border},
    \l{stylesheet-reference.html#chunk-sub}{chunk}, and
    \l{stylesheet-reference.html#text-align-prop}{text-align} can be customized using
    style sheets. However, if one property or sub-control is customized,
    all the other properties or sub-controls must be customized as well.

    \image progressBar-stylesheet.png

    For example, we change the \l{stylesheet-reference.html#border-prop}
    {border} to grey and the \l{stylesheet-reference.html#chunk-sub}{chunk}
    to cerulean.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 126

    This leaves the \l{stylesheet-reference.html#text-align-prop}
    {text-align}, which we customize by positioning the text in the center of
    the progress bar.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 127

    A \l{stylesheet-reference.html#margin-prop}{margin} can be included to
    obtain more visible chunks.

    \image progressBar2-stylesheet.png

    In the screenshot above, we use a
    \l{stylesheet-reference.html#margin-prop}{margin} of 0.5 pixels.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 128

    \section2 Customizing QPushButton

    A QPushButton is styled as follows:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 129

    For a QPushButton with a menu, use the 
    \l{Qt Style Sheets Reference#menu-indicator-sub}{::menu-indicator} 
    subcontrol.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 130

    Checkable QPushButton have the \l{Qt Style Sheets Reference#checked-ps}
    {:checked} pseudo state set.

    \section2 Customizing QRadioButton

    The indicator of a QRadioButton can be changed using:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 131

    \section2 Customizing QScrollBar

    The QScrollBar can be styled using its subcontrols like
    \l{stylesheet-reference.html#handle-sub}{handle},
    \l{stylesheet-reference.html#add-line-sub}{add-line},
    \l{stylesheet-reference.html#sub-line-sub}{sub-line}, and so on. Note that
    if one property or sub-control is customized, all the other properties or
    sub-controls must be customized as well.

    \image stylesheet-scrollbar1.png

    The scroll bar above has been styled in aquamarine with a solid grey
    border.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 132

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 133

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 134

    The \l{stylesheet-reference.html#left-arrow-sub}{left-arrow} and
    \l{stylesheet-reference.html#right-arrow-sub}{right-arrow} have a solid grey
    border with a white background. As an alternative, you could also embed the
    image of an arrow.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 135

    If you want the scroll buttons of the scroll bar to be placed together
    (instead of the edges) like on Mac OS X, you can use the following
    stylesheet:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 136
    
    The scroll bar using the above stylesheet looks like this:
        \image stylesheet-scrollbar2.png


    To customize a vertical scroll bar use a style sheet similar to the following:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 137

    \section2 Customizing QSizeGrip

    QSizeGrip is usually styled by just setting an image.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 138

    \section2 Customizing QSlider

    You can style horizontal slider as below:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 139

    If you want to change the color of the slider parts before and after the handle, you can use the add-page
    and sub-page subcontrols. For example, for a vertical slider:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 140

    \section2 Customizing QSpinBox

    QSpinBox can be completely customized as below (the style sheet has commentary inline):

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 141


    \section2 Customizing QSplitter

    A QSplitter derives from a QFrame and hence can be styled like a QFrame. 
    The grip or the handle is customized using the 
    \l{Qt Style Sheets Reference#handle-sub}{::handle} subcontrol.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 142

    \section2 Customizing QStatusBar

    We can provide a background for the status bar and a border for items
    inside the status bar as follows:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 143

    Note that widgets that have been added to the QStatusBar can be styled
    using the descendant declaration (i.e)
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 144

    \section2 Customizing QTabWidget and QTabBar

    \image tabWidget-stylesheet1.png

    For the screenshot above, we need a stylesheet as follows:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 145

    Often we require the tabs to overlap to look like below:
    \image tabWidget-stylesheet2.png

    For a tab widget that looks like above, we make use of 
    \l{http://www.communitymx.com/content/article.cfm?cid=B0029}
    {negative margins}. The resulting stylesheet looks like this:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 146

    To move the tab bar to the center (as below), we require the following stylesheet:
    \image tabWidget-stylesheet3.png

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 147

    The tear indicator and the scroll buttons can be further customized as follows:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 148

    \section2 Customizing QTableView

    Suppose we'd like our selected item in QTableView to have bubblegum pink
    fade to white as its background.

    \image tableWidget-stylesheet.png

    This is possible with the
    \l{stylesheet-reference.html#selection-background-color-prop}
    {selection-background-color} property and the syntax required is:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 149

    The corner widget can be customized using the following style sheet

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 150

    \section2 Customizing QToolBar
    
    The background and the handle of a QToolBar is customized as below:
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 151

    \section2 Customizing QToolBox

    The tabs of the QToolBox are customized using the 'tab' subcontrol.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 152

    \section2 Customizing QToolButton

    There are three types of QToolButtons.
    \list
       \i The QToolButton has no menu. In this case, the QToolButton is styled
          exactly like QPushButton.  See 
          \l{#Customizing QPushButton}{Customizing QPushButton} for an
          example.

       \i The QToolButton has a menu and has the QToolButton::popupMode set to
          QToolButton::DelayedPopup or QToolButton::InstantPopup. In this case,
          the QToolButton is styled exactly like a QPushButton with a menu.
          See \l{#Customizing QPushButton}{Customizing QPushButton} for an
          example of the usage of the menu-indicator pseudo state.

        \i The QToolButton has its QToolButton::popupMode set to
           QToolButton::MenuButtonPopup. In this case, we style it as follows:
    \endlist

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 153


    \section2 Customizing QToolTip

    QToolTip is customized exactly like a QLabel. In addition, for platforms
    that support it, the opacity property may be set to adjust the opacity.

    For example,
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 154

    \section2 Customizing QTreeView

    The background color of alternating rows can be customized using the following
    style sheet:

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 155

    To provide a special background when you hover over items, we can use the
    \l{item-sub}{::item} subcontrol. For example,
    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 156

    The branches of a QTreeView are styled using the 
    \l{Qt Style Sheets Reference#branch-sub}{::branch} subcontrol. The
    following stylesheet color codes the various states when drawing
    a branch.

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 157
    
    Colorful, though it is, a more useful example can be made using the
    following images:

    \table
    \row
    \o \inlineimage stylesheet-vline.png
    \o \inlineimage stylesheet-branch-more.png
    \o \inlineimage stylesheet-branch-end.png
    \o \inlineimage stylesheet-branch-closed.png
    \o \inlineimage stylesheet-branch-open.png
    \row
    \o vline.png
    \o branch-more.png
    \o branch-end.png
    \o branch-closed.png
    \o branch-open.png
    \endtable

    \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 158

    The resulting tree view looks like this:

    \image stylesheet-treeview.png

    \sa {Style Sheet Example}, {Supported HTML Subset}, QStyle


    \section1 Common mistakes

    This section lists some common mistakes when using stylesheets.

    \section2 QPushButton and images

    When styling a QPushButton, it is often desirable to use an image as the
    button graphic. It is common to try the
    \l{Qt Style Sheets Reference#background-image-prop}{background-image}
    property,
    but this has a number of drawbacks: For instance, the background will
    often appear hidden behind the button decoration, because it is not
    considered a background. In addition, if the button is resized, the
    entire background will be stretched or tiled, which does not
    always look good.

    It is better to use the
    \l{Qt Style Sheets Reference#border-image-prop}{border-image}
    property, as it will always display the image,
    regardless of the background (you can combine it with a background if it
    has alpha values in it), and it has special settings to deal with button
    resizing.

    Consider the following snippet:

    \snippet doc/src/snippets/stylesheet/common-mistakes.cpp 1

    This will produce a button looking like this:

    \image stylesheet-border-image-normal.png

    The numbers after the url gives the top, right, bottom and left number of
    pixels, respectively. These numbers correspond to the border and should not
    stretch when the size changes.
    Whenever you resize the button, the middle part of the image will stretch
    in both directions, while the pixels specified in the stylesheet
    will not. This makes the borders of the button look more natural, like
    this:

    \table
    \row
    \o \inlineimage stylesheet-border-image-stretched.png
    \row
    \o With borders
    \endtable

    \table
    \row
    \o \inlineimage stylesheet-border-image-wrong.png
    \row
    \o Without borders
    \endtable

    */