summaryrefslogtreecommitdiffstats
path: root/library/palette.tcl
blob: 45000b00c21128dddd2ae45661acfb9bdd562f88 (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
# palette.tcl --
#
# This file contains procedures that change the color palette used
# by Tk.
#
# RCS: @(#) $Id: palette.tcl,v 1.4 1999/04/16 01:51:26 stanton Exp $
#
# Copyright (c) 1995-1997 Sun Microsystems, Inc.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#

# tk_setPalette --
# Changes the default color scheme for a Tk application by setting
# default colors in the option database and by modifying all of the
# color options for existing widgets that have the default value.
#
# Arguments:
# The arguments consist of either a single color name, which
# will be used as the new background color (all other colors will
# be computed from this) or an even number of values consisting of
# option names and values.  The name for an option is the one used
# for the option database, such as activeForeground, not -activeforeground.

proc tk_setPalette {args} {
    global tkPalette

    # Create an array that has the complete new palette.  If some colors
    # aren't specified, compute them from other colors that are specified.

    if {[llength $args] == 1} {
	set new(background) [lindex $args 0]
    } else {
	array set new $args
    }
    if {![info exists new(background)]} {
	error "must specify a background color"
    }
    if {![info exists new(foreground)]} {
	set new(foreground) black
    }
    set bg [winfo rgb . $new(background)]
    set fg [winfo rgb . $new(foreground)]
    set darkerBg [format #%02x%02x%02x [expr {(9*[lindex $bg 0])/2560}] \
	    [expr {(9*[lindex $bg 1])/2560}] [expr {(9*[lindex $bg 2])/2560}]]
    foreach i {activeForeground insertBackground selectForeground \
	    highlightColor} {
	if {![info exists new($i)]} {
	    set new($i) $new(foreground)
	}
    }
    if {![info exists new(disabledForeground)]} {
	set new(disabledForeground) [format #%02x%02x%02x \
		[expr {(3*[lindex $bg 0] + [lindex $fg 0])/1024}] \
		[expr {(3*[lindex $bg 1] + [lindex $fg 1])/1024}] \
		[expr {(3*[lindex $bg 2] + [lindex $fg 2])/1024}]]
    }
    if {![info exists new(highlightBackground)]} {
	set new(highlightBackground) $new(background)
    }
    if {![info exists new(activeBackground)]} {
	# Pick a default active background that islighter than the
	# normal background.  To do this, round each color component
	# up by 15% or 1/3 of the way to full white, whichever is
	# greater.

	foreach i {0 1 2} {
	    set light($i) [expr {[lindex $bg $i]/256}]
	    set inc1 [expr {($light($i)*15)/100}]
	    set inc2 [expr {(255-$light($i))/3}]
	    if {$inc1 > $inc2} {
		incr light($i) $inc1
	    } else {
		incr light($i) $inc2
	    }
	    if {$light($i) > 255} {
		set light($i) 255
	    }
	}
	set new(activeBackground) [format #%02x%02x%02x $light(0) \
		$light(1) $light(2)]
    }
    if {![info exists new(selectBackground)]} {
	set new(selectBackground) $darkerBg
    }
    if {![info exists new(troughColor)]} {
	set new(troughColor) $darkerBg
    }
    if {![info exists new(selectColor)]} {
	set new(selectColor) #b03060
    }

    # let's make one of each of the widgets so we know what the 
    # defaults are currently for this platform.
    toplevel .___tk_set_palette
    wm withdraw .___tk_set_palette
    foreach q {button canvas checkbutton entry frame label listbox menubutton menu message \
		 radiobutton scale scrollbar text} {
	$q .___tk_set_palette.$q
    }

    # Walk the widget hierarchy, recoloring all existing windows.
    # The option database must be set according to what we do here, 
    # but it breaks things if we set things in the database while 
    # we are changing colors...so, tkRecolorTree now returns the
    # option database changes that need to be made, and they
    # need to be evalled here to take effect.
    # We have to walk the whole widget tree instead of just 
    # relying on the widgets we've created above to do the work
    # because different extensions may provide other kinds
    # of widgets that we don't currently know about, so we'll
    # walk the whole hierarchy just in case.

    eval [tkRecolorTree . new]

    catch {destroy .___tk_set_palette}

    # Change the option database so that future windows will get the
    # same colors.

    foreach option [array names new] {
	option add *$option $new($option) widgetDefault
    }

    # Save the options in the global variable tkPalette, for use the
    # next time we change the options.

    array set tkPalette [array get new]
}

# tkRecolorTree --
# This procedure changes the colors in a window and all of its
# descendants, according to information provided by the colors
# argument. This looks at the defaults provided by the option 
# database, if it exists, and if not, then it looks at the default
# value of the widget itself.
#
# Arguments:
# w -			The name of a window.  This window and all its
#			descendants are recolored.
# colors -		The name of an array variable in the caller,
#			which contains color information.  Each element
#			is named after a widget configuration option, and
#			each value is the value for that option.

proc tkRecolorTree {w colors} {
    global tkPalette
    upvar $colors c
    set result {}
    foreach dbOption [array names c] {
	set option -[string tolower $dbOption]
	if {![catch {$w config $option} value]} {
	    # if the option database has a preference for this
	    # dbOption, then use it, otherwise use the defaults
	    # for the widget.
	    set defaultcolor [option get $w $dbOption widgetDefault]
	    if {[string match {} $defaultcolor]} {
		set defaultcolor [winfo rgb . [lindex $value 3]]
	    } else {
		set defaultcolor [winfo rgb . $defaultcolor]
	    }
	    set chosencolor [winfo rgb . [lindex $value 4]]
	    if {[string match $defaultcolor $chosencolor]} {
		# Change the option database so that future windows will get
		# the same colors.
		append result ";\noption add [list \
		    *[winfo class $w].$dbOption $c($dbOption) 60]"
		$w configure $option $c($dbOption)
	    }
	}
    }
    foreach child [winfo children $w] {
	append result ";\n[tkRecolorTree $child c]"
    }
    return $result
}

# tkDarken --
# Given a color name, computes a new color value that darkens (or
# brightens) the given color by a given percent.
#
# Arguments:
# color -	Name of starting color.
# perecent -	Integer telling how much to brighten or darken as a
#		percent: 50 means darken by 50%, 110 means brighten
#		by 10%.

proc tkDarken {color percent} {
    foreach {red green blue} [winfo rgb . $color] {
      set red [expr {($red/256)*$percent/100}]
      set green [expr {($green/256)*$percent/100}]
      set blue [expr {($blue/256)*$percent/100}]
      break
    }
    if {$red > 255} {
	set red 255
    }
    if {$green > 255} {
	set green 255
    }
    if {$blue > 255} {
	set blue 255
    }
    return [format "#%02x%02x%02x" $red $green $blue]
}

# tk_bisque --
# Reset the Tk color palette to the old "bisque" colors.
#
# Arguments:
# None.

proc tk_bisque {} {
    tk_setPalette activeBackground #e6ceb1 activeForeground black \
	    background #ffe4c4 disabledForeground #b0b0b0 foreground black \
	    highlightBackground #ffe4c4 highlightColor black \
	    insertBackground black selectColor #b03060 \
	    selectBackground #e6ceb1 selectForeground black \
	    troughColor #cdb79e
}