gdk_window_invalidate_rect , gtk3

LambertDW · **Joined:** Tue Mar 27, 2012 10:50 pm **Posts:** 7

gtk3

Question: how do I get the first argument for gdk_window_invalidate_rect from my GtkDrawingArea*widget in gtk3?

This is my "button-press" callback. Eventually clicking a button will make a change requiring redraw, which I'd like to handle in my "draw" signal callback. The manuals say I can trigger the draw signal by invalidating a region. The gdk_window_invalidate_rect says it's a wrapper around the region invalidator, and furthermore says I can pass NULL as second argument. The drawing is simple, redrawing the whole window will be quick.

Code:

/*the widget is a GtkDrawingArea*/
static gboolean button_press_event(GtkWidget*widget,const GdkEvent*event,gpointer data) {
  gdouble x_win, y_win;
  if (!gdk_event_get_coords(event,&x_win,&y_win))
    puts("BUTTON, gdk_event_get_coords(event,&x_win,&y_win)) failed");
  else
    printf("x_win=%g y_win=%g\n",(double)x_win,(double)y_win);
  gdk_window_invalidate_rect(widget,(const GdkRectangle *)NULL,TRUE);
  return TRUE;
}

errol · **Posted:** Wed Mar 28, 2012 10:05 pm

Hi,

You will need to use the function :-

Code:

GdkWindow *         gtk_widget_get_window               (GtkWidget *widget);

to obtain the GdkWindow of a widget.

LambertDW · **Joined:** Tue Mar 27, 2012 10:50 pm **Posts:** 7

Thank you for all your responses.

I hope to end up with a useful code with public posting at http://rosettacode.org/wiki/Honeycombs .
You can of course alter it or post before me. I suppose I'll finish tonight now that all the callbacks work. haha.

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gdk_window_invalidate_rect , gtk3

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