Re: problems changing cursor in scribble-simple.c

[Darin Adler <darin eazel com>]

on 2/26/01 9:18 AM, Cevat Ustun at ustun Glue umd edu wrote:

> In an attempt to change the cursor in scribble-simple.c,
> I added the following declaration
>
>     GdkCursor *cursor;
>
> and the following lines after the drawing_area declaration:
>
>     new_cursor=gdk_cursor_new(GDK_CROSS);
>     gdk_window_set_cursor(drawing_area->window, new_cursor);
>     gdk_cursor_destroy (new_cursor);
>
> but I get the error
>
>     Gdk-CRITICAL **: file gdkwindow.c: line 1274
>     (gdk_window_set_cursor): assertion `window != NULL' failed.

When a widget has not yet been realized, the window is not yet allocated.
You must make your gdk_window_set_cursor call after the widget is realized.
One fix might be to call gtk_widget_realize on the drawing area first. I
believe that will work as long as it's already parented all the way up to
the GtkWindow level.

    -- Darin