Re: "undrawing" a line
- From: Davina Armstrong <davina lickey com>
- To: Pavel Cisler <pavel eazel com>
- Cc: "gtk-app-devel-list gnome org" <gtk-app-devel-list gnome org>, gtk-list gnome org
- Subject: Re: "undrawing" a line
- Date: Wed, 13 Dec 2000 12:19:23 -0800
Pavel Cisler wrote:
>
> Davina Armstrong wrote:
> >
> > I posted earlier that I was trying to draw decorations around a GtkLabel
> > (which is actually part of a composite widget I wrote that packs a
> > GtkLabel and GtkEntry into a GtkHBox), which I've done successfully -
> > thanks. The idea is that I want the decorations to be drawn when
> > MyWidget gets focus, and "undraw" them when it loses the focus. I wrote
> > the following draw_focus function, which is called from
> > my_widget_focus_in() and my_widget_focus_out():
> >
> > static void my_widget_draw_focus(GtkWidget* widget)
> > {
> > g_return_if_fail(widget != NULL);
> > g_return_if_fail(IS_MY_WIDGET(widget));
> >
> > if (GTK_WIDGET_HAS_FOCUS(widget)) {
> > /* draw the decoration */
> > } else {
> > gtk_widget_draw(widget, NULL);
> > }
> > }
> >
> > The decorations draw when MyWidget gets focus, but don't go away when it
> > loses the focus. I've verified that gtk_widget_draw() is being called.
> > Can anyone tell me what I'm doing wrong?
> >
> > Thanks!
> > Davina
>
> Davina,
>
> My guess is that the extra decorations don't go away because the
> gtk_widget_draw doesn't erase any of the backgrounds your decorations
> are drawn on -- they normally come erased for you in the exposure
> callback. You could easily verify this by de-focusing your widget and
> causing it to redraw by invalidating it by another window. The part that
> you invalidate should redraw without the decorations.
>
> Pavel
Pavel -
I'm sorry it has taken so long to check this. You are right, covering
it with another window does cause the decorations to disappear, but I
don't know how to invalidate it in code. Can you (or anyone else)
please help?
Thanks again!
Davina
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