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# This file contains procedures that change the color palette used
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# RCS: @(#) $Id: palette.tcl,v 1.3 1998/09/14 18:23:24 stanton Exp $
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# Copyright (c) 1995-1997 Sun Microsystems, Inc.
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# See the file "license.terms" for information on usage and redistribution
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# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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# Changes the default color scheme for a Tk application by setting
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# default colors in the option database and by modifying all of the
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# color options for existing widgets that have the default value.
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# The arguments consist of either a single color name, which
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# will be used as the new background color (all other colors will
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# be computed from this) or an even number of values consisting of
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# option names and values. The name for an option is the one used
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# for the option database, such as activeForeground, not -activeforeground.
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proc tk_setPalette {args} {
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# Create an array that has the complete new palette. If some colors
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# aren't specified, compute them from other colors that are specified.
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if {[llength $args] == 1} {
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set new(background) [lindex $args 0]
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if {![info exists new(background)]} {
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error "must specify a background color"
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if {![info exists new(foreground)]} {
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set new(foreground) black
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set bg [winfo rgb . $new(background)]
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set fg [winfo rgb . $new(foreground)]
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set darkerBg [format #%02x%02x%02x [expr {(9*[lindex $bg 0])/2560}] \
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[expr {(9*[lindex $bg 1])/2560}] [expr {(9*[lindex $bg 2])/2560}]]
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foreach i {activeForeground insertBackground selectForeground \
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if {![info exists new($i)]} {
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set new($i) $new(foreground)
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if {![info exists new(disabledForeground)]} {
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set new(disabledForeground) [format #%02x%02x%02x \
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[expr {(3*[lindex $bg 0] + [lindex $fg 0])/1024}] \
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[expr {(3*[lindex $bg 1] + [lindex $fg 1])/1024}] \
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[expr {(3*[lindex $bg 2] + [lindex $fg 2])/1024}]]
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if {![info exists new(highlightBackground)]} {
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set new(highlightBackground) $new(background)
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if {![info exists new(activeBackground)]} {
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# Pick a default active background that islighter than the
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# normal background. To do this, round each color component
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# up by 15% or 1/3 of the way to full white, whichever is
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set light($i) [expr {[lindex $bg $i]/256}]
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set inc1 [expr {($light($i)*15)/100}]
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set inc2 [expr {(255-$light($i))/3}]
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if {$light($i) > 255} {
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set new(activeBackground) [format #%02x%02x%02x $light(0) \
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if {![info exists new(selectBackground)]} {
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set new(selectBackground) $darkerBg
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if {![info exists new(troughColor)]} {
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set new(troughColor) $darkerBg
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if {![info exists new(selectColor)]} {
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set new(selectColor) #b03060
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# let's make one of each of the widgets so we know what the
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# defaults are currently for this platform.
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toplevel .___tk_set_palette
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wm withdraw .___tk_set_palette
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foreach q {button canvas checkbutton entry frame label listbox menubutton menu message \
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radiobutton scale scrollbar text} {
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$q .___tk_set_palette.$q
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# Walk the widget hierarchy, recoloring all existing windows.
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# The option database must be set according to what we do here,
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# but it breaks things if we set things in the database while
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# we are changing colors...so, tkRecolorTree now returns the
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# option database changes that need to be made, and they
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# need to be evalled here to take effect.
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# We have to walk the whole widget tree instead of just
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# relying on the widgets we've created above to do the work
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# because different extensions may provide other kinds
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# of widgets that we don't currently know about, so we'll
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# walk the whole hierarchy just in case.
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eval [tkRecolorTree . new]
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catch {destroy .___tk_set_palette}
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# Change the option database so that future windows will get the
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foreach option [array names new] {
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option add *$option $new($option) widgetDefault
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# Save the options in the global variable tkPalette, for use the
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# next time we change the options.
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array set tkPalette [array get new]
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# This procedure changes the colors in a window and all of its
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# descendants, according to information provided by the colors
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# argument. This looks at the defaults provided by the option
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# database, if it exists, and if not, then it looks at the default
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# value of the widget itself.
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# w - The name of a window. This window and all its
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# descendants are recolored.
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# colors - The name of an array variable in the caller,
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# which contains color information. Each element
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# is named after a widget configuration option, and
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# each value is the value for that option.
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proc tkRecolorTree {w colors} {
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foreach dbOption [array names c] {
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set option -[string tolower $dbOption]
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if {![catch {$w config $option} value]} {
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# if the option database has a preference for this
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# dbOption, then use it, otherwise use the defaults
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set defaultcolor [option get $w $dbOption widgetDefault]
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if {[string match {} $defaultcolor]} {
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set defaultcolor [winfo rgb . [lindex $value 3]]
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set defaultcolor [winfo rgb . $defaultcolor]
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set chosencolor [winfo rgb . [lindex $value 4]]
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if {[string match $defaultcolor $chosencolor]} {
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# Change the option database so that future windows will get
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append result ";\noption add [list \
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*[winfo class $w].$dbOption $c($dbOption) 60]"
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$w configure $option $c($dbOption)
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foreach child [winfo children $w] {
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append result ";\n[tkRecolorTree $child c]"
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# Given a color name, computes a new color value that darkens (or
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# brightens) the given color by a given percent.
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# color - Name of starting color.
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# perecent - Integer telling how much to brighten or darken as a
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# percent: 50 means darken by 50%, 110 means brighten
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proc tkDarken {color percent} {
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set l [winfo rgb . $color]
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set red [expr {[lindex $l 0]/256}]
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set green [expr {[lindex $l 1]/256}]
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set blue [expr {[lindex $l 2]/256}]
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set red [expr {($red*$percent)/100}]
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set green [expr {($green*$percent)/100}]
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set blue [expr {($blue*$percent)/100}]
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format #%02x%02x%02x $red $green $blue
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# Reset the Tk color palette to the old "bisque" colors.
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tk_setPalette activeBackground #e6ceb1 activeForeground black \
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background #ffe4c4 disabledForeground #b0b0b0 foreground black \
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highlightBackground #ffe4c4 highlightColor black \
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insertBackground black selectColor #b03060 \
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selectBackground #e6ceb1 selectForeground black \
added
removed
library/palette.tcl
