# palette.tcl --

#

# This file contains procedures that change the color palette used

# by Tk.

#

# RCS: @(#) $Id: palette.tcl,v 1.8 2001/11/29 10:54:21 dkf 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} {

    if {[winfo depth .] == 1} {

	# Just return on monochrome displays, otherwise errors will occur

	return

    }

    # 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"

    }

    set bg [winfo rgb . $new(background)]

    if {![info exists new(foreground)]} {

	# Note that the range of each value in the triple returned by

	# [winfo rgb] is 0-65535, and your eyes are more sensitive to

	# green than to red, and more to red than to blue.

	foreach {r g b} $bg {break}

	if {$r+1.5*$g+0.5*$b > 100000} {

	    set new(foreground) black

	} else {

	    set new(foreground) white

	}

    }

    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 labelframe

	listbox menubutton menu message radiobutton scale scrollbar

	spinbox 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, ::tk::RecolorTree 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 [tk::RecolorTree . 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 variable ::tk::Palette, for use the

    # next time we change the options.

    array set ::tk::Palette [array get new]

}

# ::tk::RecolorTree --

# 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 ::tk::RecolorTree {w colors} {

    upvar $colors c

    set result {}

    set prototype .___tk_set_palette.[string tolower [winfo class $w]]

    if {![winfo exists $prototype]} {

	unset prototype

    }

    foreach dbOption [array names c] {

	set option -[string tolower $dbOption]

	set class [string replace $dbOption 0 0 [string toupper \

		[string index $dbOption 0]]]

	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 $class]

	    if {[string match {} $defaultcolor] || \

		    ([info exists prototype] && \

		    [$prototype cget $option] ne "$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[::tk::RecolorTree $child c]"

    }

    return $result

}

# ::tk::Darken --

# 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 ::tk::Darken {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

}