Re: drawing area and GPtrArray illogical error

[Soeren Sandmann <sandmann daimi au dk>]

frederico schardong <frede sch gmail com> writes:

> When I click with the mouse on the drawing area the callback
> button_pressed is called and the g_print message shows, and when I
> move the window the callback expose_event is called and shows its
> g_print. The only difference between both g_print is the first word,
> in other words, o parray is correct and the points should be drawned
> in the drawing area. But that isn't happening.
> 
> Does anyone have an idea about it?

Instead of drawing the points in the button press handler, just queue
a repaint for the drawing area and let the expose handler take care of
the drawing:


static gboolean button_pressed (GtkWidget *a, GdkEventButton *event, GtkDesenho *desenho)
{
        gtk_widget_queue_draw (a);

        return FALSE;
}

Generally, you should not draw in things like event handlers, only in
the expose handler. This lets gtk+ do automatic double buffering and
combine multiple repaints into one.


Soren