GtkDrawingArea

[Thomas Nemeth <tnemeth laas fr>]

        Hi,

        I'm looking for a way of drawing with the mouse in a
        GtkDrawingArea.

        By now I used an ugly code that was :

    drawing_area = gtk_drawing_area_new ();
    gtk_drawing_area_size (GTK_DRAWING_AREA (drawing_area), GRAPH_W,
                           GRAPH_H);
    GTK_WIDGET_SET_FLAGS (GTK_WIDGET (drawing_area), GTK_CAN_FOCUS);
    gtk_widget_set_sensitive (GTK_WIDGET (drawing_area), TRUE);
    gtk_signal_connect (GTK_OBJECT (drawing_area), "button-press-event",
                        GTK_SIGNAL_FUNC (set_pos),
                        NULL);
    gtk_signal_connect (GTK_OBJECT (drawing_area), "expose-event",
                        GTK_SIGNAL_FUNC (draw_map),
                        NULL);
    gtk_container_add (GTK_CONTAINER (berceau), drawing_area);
    gtk_widget_show (drawing_area);
    gtk_widget_set_events (widget, -1);

        It was Ok. But it was done at the app-init level and now I
        need to do it at any time when I change the view... And it
        tells me :
Gtk-CRITICAL **: file gtkwidget.c: line 3820 (gtk_widget_set_events):
assertion `!GTK_WIDGET_REALIZED (widget)' failed.

        So I added a function attached to an event :

    gtk_signal_connect (GTK_OBJECT (drawing_area), "realize",
                        GTK_SIGNAL_FUNC (set_events_da),
                        NULL);

        which only contains
    gtk_widget_set_events (widget, -1);

        in order to have it done only when the widget is realized.
        But it does not work...

        Does any one have an idea ? I'm totaly lost...


-- 
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