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# palette.tcl --

#

# This file contains procedures that change the color palette used

# by Tk.

#

# SCCS: @(#) palette.tcl 1.11 97/06/23 20:35:44

#

# 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]

            }

          if {[lindex $value 4] != {}} {

            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} {

    set l [winfo rgb . $color]

    set red [expr {[lindex $l 0]/256}]

    set green [expr {[lindex $l 1]/256}]

    set blue [expr {[lindex $l 2]/256}]

    set red [expr {($red*$percent)/100}]

    if {$red > 255} {

        set red 255

    }

    set green [expr {($green*$percent)/100}]

    if {$green > 255} {

        set green 255

    }

    set blue [expr {($blue*$percent)/100}]

    if {$blue > 255} {

        set blue 255

    }

    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

}