1palette(3) User Contributed Perl Documentation palette(3)
2
6 Tk::palette - Modify the Tk color palette
7
9 $widget->setPalette(background)
10 $widget->setPalette(name=>value?,name=>value ...?)
12 $widget->bisque
14
16 The setPalette method changes the color scheme for Tk. It does this by
17 modifying the colors of existing widgets and by changing the option
18 database so that future widgets will use the new color scheme. If
19 setPalette is invoked with a single argument, the argument is the name
20 of a color to use as the normal background color; setPalette will
21 compute a complete color palette from this background color.
22 Alternatively, the arguments to setPalette may consist of any number of
23 name-value pairs, where the first argument of the pair is the name of
24 an option in the Tk option database and the second argument is the new
25 value to use for that option. The following database names are
26 currently supported:
27 activeBackground foreground selectColor
29 activeForeground highlightBackground selectBackground
30 background highlightColor selectForeground
31 disabledForeground insertBackground troughColor
32 setPalette tries to compute reasonable defaults for any options that
34 you don't specify. You can specify options other than the above ones
35 and Tk will change those options on widgets as well. This feature may
36 be useful if you are using custom widgets with additional color
37 options.
38 Once it has computed the new value to use for each of the color
40 options, setPalette scans the widget hierarchy to modify the options of
41 all existing widgets. For each widget, it checks to see if any of the
42 above options is defined for the widget. If so, and if the option's
43 current value is the default, then the value is changed; if the option
44 has a value other than the default, setPalette will not change it. The
45 default for an option is the one provided by the widget
46 (($w->configure('option'))[3]) unless setPalette has been run
47 previously, in which case it is the value specified in the previous
48 invocation of setPalette.
49 After modifying all the widgets in the application, setPalette adds
51 options to the option database to change the defaults for widgets
52 created in the future. The new options are added at priority
53 widgetDefault, so they will be overridden by options from the
54 .Xdefaults file or options specified on the command-line that creates a
55 widget.
56 The method bisque is provided for backward compatibility: it restores
58 the application's colors to the light brown (``bisque'') color scheme
59 used in Tk 3.6 and earlier versions.
60
62 The use of option database names rather than the configure names is
63 understandable given the mechanism (copied from Tcl/Tk), but is
64 potentially confusing.
65 The interpolation of different 'shades' of color used for 3D effects in
67 'RGB' space can lead to undesirable changes in 'hue'. Interpolation in
68 'HSV' (as used in Tk::ColorEditor) would be more robust and X11R5's
69 color support probably even more so.
70
72 Tk::options
73
75 bisque, color, palette
76perl v5.30.1 2020-01-30 palette(3)