blob: 90b1afc717af21489b78d8417b30617187d4f53d (
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
|
# cscroll.tcl --
#
# This demonstration script creates a simple canvas that can be
# scrolled in two dimensions.
if {![info exists widgetDemo]} {
error "This script should be run from the \"widget\" demo."
}
package require Tk
set w .cscroll
catch {destroy $w}
toplevel $w
wm title $w "Scrollable Canvas Demonstration"
wm iconname $w "cscroll"
positionWindow $w
set c $w.c
label $w.msg -font $font -wraplength 4i -justify left -text "This window displays a canvas widget that can be scrolled either using the scrollbars or by dragging with button 2 in the canvas. If you click button 1 on one of the rectangles, its indices will be printed on stdout."
pack $w.msg -side top
## See Code / Dismiss buttons
set btns [addSeeDismiss $w.buttons $w]
pack $btns -side bottom -fill x
frame $w.grid
scrollbar $w.hscroll -orient horiz -command "$c xview"
scrollbar $w.vscroll -command "$c yview"
canvas $c -relief sunken -borderwidth 2 -scrollregion {-11c -11c 50c 20c} \
-xscrollcommand "$w.hscroll set" \
-yscrollcommand "$w.vscroll set"
pack $w.grid -expand yes -fill both -padx 1 -pady 1
grid rowconfig $w.grid 0 -weight 1 -minsize 0
grid columnconfig $w.grid 0 -weight 1 -minsize 0
grid $c -padx 1 -in $w.grid -pady 1 \
-row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news
grid $w.vscroll -in $w.grid -padx 1 -pady 1 \
-row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news
grid $w.hscroll -in $w.grid -padx 1 -pady 1 \
-row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news
set bg [lindex [$c config -bg] 4]
for {set i 0} {$i < 20} {incr i} {
set x [expr {-10 + 3*$i}]
for {set j 0; set y -10} {$j < 10} {incr j; incr y 3} {
$c create rect ${x}c ${y}c [expr {$x+2}]c [expr {$y+2}]c \
-fill $bg -tags rect
$c create text [expr {$x+1}]c [expr {$y+1}]c -text "$i,$j" \
-anchor center -tags text
}
}
$c bind all <Enter> "scrollEnter $c"
$c bind all <Leave> "scrollLeave $c"
$c bind all <Button-1> "scrollButton $c"
if {[package vsatisfies [package provide Tk] 8.7-]} {
bind $c <Button-2> "$c scan mark %x %y"
bind $c <B2-Motion> "$c scan dragto %x %y"
bind $c <MouseWheel> {
tk::MouseWheel %W y %D -30.0
}
bind $c <Option-MouseWheel> {
tk::MouseWheel %W y %D -3.0
}
bind $c <Shift-MouseWheel> {
tk::MouseWheel %W x %D -30.0
}
bind $c <Shift-Option-MouseWheel> {
tk::MouseWheel %W x %D -3.0
}
} elseif {[tk windowingsystem] eq "aqua"} {
bind $c <Button-3> "$c scan mark %x %y"
bind $c <B3-Motion> "$c scan dragto %x %y"
bind $c <MouseWheel> {
%W yview scroll [expr {-(%D)}] units
}
bind $c <Option-MouseWheel> {
%W yview scroll [expr {-10 * (%D)}] units
}
bind $c <Shift-MouseWheel> {
%W xview scroll [expr {-(%D)}] units
}
bind $c <Shift-Option-MouseWheel> {
%W xview scroll [expr {-10 * (%D)}] units
}
} else {
bind $c <Button-2> "$c scan mark %x %y"
bind $c <B2-Motion> "$c scan dragto %x %y"
# We must make sure that positive and negative movements are rounded
# equally to integers, avoiding the problem that
# (int)1/30 = 0,
# but
# (int)-1/30 = -1
# The following code ensure equal +/- behaviour.
bind $c <MouseWheel> {
if {%D >= 0} {
%W yview scroll [expr {%D/-30}] units
} else {
%W yview scroll [expr {(%D-29)/-30}] units
}
}
bind $c <Option-MouseWheel> {
%W yview scroll [expr {%D/-3}] units
}
bind $c <Shift-MouseWheel> {
if {%D >= 0} {
%W xview scroll [expr {%D/-30}] units
} else {
%W xview scroll [expr {(%D-29)/-30}] units
}
}
bind $c <Shift-Option-MouseWheel> {
%W xview scroll [expr {%D/-3}] units
}
}
if {[tk windowingsystem] eq "x11" && ![package vsatisfies [package provide Tk] 8.7-]} {
# Support for mousewheels on Linux/Unix commonly comes through mapping
# the wheel to the extended buttons. If you have a mousewheel, find
# Linux configuration info at:
# http://linuxreviews.org/howtos/xfree/mouse/
bind $c <Button-4> {
if {!$tk_strictMotif} {
%W yview scroll -5 units
}
}
bind $c <Shift-Button-4> {
if {!$tk_strictMotif} {
%W xview scroll -5 units
}
}
bind $c <Button-5> {
if {!$tk_strictMotif} {
%W yview scroll 5 units
}
}
bind $c <Shift-Button-5> {
if {!$tk_strictMotif} {
%W xview scroll 5 units
}
}
}
proc scrollEnter canvas {
global oldFill
set id [$canvas find withtag current]
if {[lsearch [$canvas gettags current] text] >= 0} {
set id [expr {$id-1}]
}
set oldFill [lindex [$canvas itemconfig $id -fill] 4]
if {[winfo depth $canvas] > 1} {
if {[tk windowingsystem] eq "aqua"} {
$canvas itemconfigure $id -fill systemSelectedTextBackgroundColor
} else {
$canvas itemconfigure $id -fill LightSeaGreen
}
}
}
proc scrollLeave canvas {
global oldFill
set id [$canvas find withtag current]
if {[lsearch [$canvas gettags current] text] >= 0} {
set id [expr {$id-1}]
}
$canvas itemconfigure $id -fill $oldFill
}
proc scrollButton canvas {
set id [$canvas find withtag current]
if {[lsearch [$canvas gettags current] text] < 0} {
set id [expr {$id+1}]
}
puts stdout "You buttoned at [lindex [$canvas itemconf $id -text] 4]"
}
|
