palette(3) User Contributed Perl Documentation palette(3)NAME
setPalette, bisque - Modify the Tk color palette
SYNOPSIS
$widget->setPalette(background)
$widget->setPalette(name=>value?,name=>value ...?)
$widget->bisque
DESCRIPTION
The setPalette method changes the color scheme for Tk. It does this by
modifying the colors of existing widgets and by changing the option
database so that future widgets will use the new color scheme. If set‐
Palette is invoked with a single argument, the argument is the name of
a color to use as the normal background color; setPalette will compute
a complete color palette from this background color. Alternatively,
the arguments to setPalette may consist of any number of name-value
pairs, where the first argument of the pair is the name of an option in
the Tk option database and the second argument is the new value to use
for that option. The following database names are currently supported:
activeBackground foreground selectColor
activeForeground highlightBackground selectBackground
background highlightColor selectForeground
disabledForeground insertBackground troughColor
setPalette tries to compute reasonable defaults for any options that
you don't specify. You can specify options other than the above ones
and Tk will change those options on widgets as well. This feature may
be useful if you are using custom widgets with additional color
options.
Once it has computed the new value to use for each of the color
options, setPalette scans the widget hierarchy to modify the options of
all existing widgets. For each widget, it checks to see if any of the
above options is defined for the widget. If so, and if the option's
current value is the default, then the value is changed; if the option
has a value other than the default, setPalette will not change it. The
default for an option is the one provided by the widget (($w->config‐
ure('option'))[3]) unless setPalette has been run previously, in which
case it is the value specified in the previous invocation of set‐
Palette.
After modifying all the widgets in the application, setPalette adds
options to the option database to change the defaults for widgets cre‐
ated in the future. The new options are added at priority widgetDe‐
fault, so they will be overridden by options from the .Xdefaults file
or options specified on the command-line that creates a widget.
The method bisque is provided for backward compatibility: it restores
the application's colors to the light brown (``bisque'') color scheme
used in Tk 3.6 and earlier versions.
BUGS
The use of option database names rather than the configure names is
understandable given the mechanism (copied from Tcl/Tk), but is poten‐
tially confusing.
The interpolation of different 'shades' of color used for 3D effects in
'RGB' space can lead to undesirable changes in 'hue'. Interpolation in
'HSV' (as used in Tk::ColorEditor) would be more robust and X11R5's
color support probably even more so.
SEE ALSO
Tk::options
KEYWORDS
bisque, color, palette
perl v5.8.8 2004-02-28 palette(3)
