gitk: Improve appearance of radiobuttons and checkbuttons

paulusmack · paulusmack · commit 51a7e8b654a0 · 2009-11-14T21:15:01.000+11:00
Commit 5497f7a ("gitk: Add configuration for UI colour scheme") added a call to tk_setPalette at startup. Unfortunately, tk_setPalette always chooses a dark red color for the selectColor value if none is given explicitly, and this makes checkbuttons and radiobuttons look rather bad. This restores the previous appearance by specifying selectColor explicitly. For light backgrounds we use white for selectColor, and for dark backgrounds we use black. The formula and threshold for distinguishing light from dark are the same as used in tk_setPalette for choosing the foreground color. Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/gitk b/gitk
@@ -10596,8 +10596,18 @@ proc setselbg {c} {
     allcanvs itemconf secsel -fill $c
 }
 
+# This sets the background color and the color scheme for the whole UI.
+# For some reason, tk_setPalette chooses a nasty dark red for selectColor
+# if we don't specify one ourselves, which makes the checkbuttons and
+# radiobuttons look bad.  This chooses white for selectColor if the
+# background color is light, or black if it is dark.
 proc setui {c} {
-    tk_setPalette $c
+    set bg [winfo rgb . $c]
+    set selc black
+    if {[lindex $bg 0] + 1.5 * [lindex $bg 1] + 0.5 * [lindex $bg 2] > 100000} {
+	set selc white
+    }
+    tk_setPalette background $c selectColor $selc
 }
 
 proc setbg {c} {
@@ -11159,7 +11169,7 @@ eval font create textfontbold [fontflags textfont 1]
 parsefont uifont $uifont
 eval font create uifont [fontflags uifont]
 
-tk_setPalette $uicolor
+setui $uicolor
 
 setoptions
 
