[Gtk-sharp-list] Changing widget colors
Miguel de Icaza
12 Apr 2003 14:34:30 -0400
> I've got a small program which tries to change the background and foreground colors of its widgets but doesn't work. Attached is the code(small). Any help is appreciated.
A GdkColor needs to be allocated on the colormap before it can be used.
The documentation covers this. Let me paste some of it:
The Gdk.Color structure is used to describe an allocated or
unallocated color. Unallocated colors only have the red,
green and blue ushort values initialized. Colors are
allocated using the <see cref="M:Gdk.Colormap.AllocColor(Gdk.Color,bool,bool)" />
method. After a color is allocated the value in the <see cref="F:Gdk.Color.pixel" /> field is valid.
DrawRedLine (Gdk.Drawable drawable)
Gdk.GC gc = new Gdk.GC (drawable);
Gdk.Color red_color = new Gdk.Color (0xff, 0, 0);
// Use the system colormap, easy.
Gdk.Colormap colormap = Gdk.Colormap.System;
colormap.AllocColor (red_color, true, true);
gc.Foreground = red_color;
// Now you can use it
drawable.DrawLine (gc, 0, 0, 100, 100);