Re: Custom widget draw

["Yuriy Rusinov" <yrusinov gmail com>]

Hello !

>
> Hi,
>
> I didn'n clearly understand what you mean. Do you call show_all() or show() on
> added widgets? How are you doing your drawing?
>
OK, here is my expose event slot
bool MyWidget :: on_expose_event (GdkEventExpose* event)
{
    if (pRefGdkWindow)
    {
        int width = get_allocation().get_width();
        int height = get_allocation().get_height();
        double scale_x = (double)width/ scale;
        double scale_y = (double)height / scale;

        Cairo::RefPtr<Cairo::Context> cr =
pRefGdkWindow->create_cairo_context();

        if (event)
        {
            // clip to the area that needs to be re-exposed so we don't draw any
            // more than we need to.
            cr->rectangle (event->area.x, event->area.y,
event->area.width, event->area.height);
            cr->clip();
            std::cout << __FUNCTION__ << " expose_event" << std::endl;
        }
        //
        // Paint the background
        //
        Gdk::Cairo::set_source_color (cr, get_style()->get_bg
(Gtk::STATE_NORMAL));
        cr->paint ();

        //
        // Paint the foreground
        //
        Gdk::Cairo::set_source_color (cr, get_style()->get_fg
(Gtk::STATE_NORMAL));

        //cr->move_to (get_allocation().get_width()/2,
get_allocation().get_height()/2);
        cr->save ();
        cr->translate (width/2.0, height/2.0);
        double radius = width < height ? width-40 : height-40;
        radius /= 2.0;
        cr->scale (radius, radius);
        cr->arc (0.0, 0.0, 1.0, 0.0, 2 * pi);
        cr->arc_negative (0.0, 0.0, 1.0, 0.0, 2 * pi);
        cr->fill ();
        cr->restore ();
        cr->stroke ();
    }
    //
    // Base class call
    //
    Gtk::Frame::on_expose_event (event);
    vBox0->show_all_children ();
    hBoxUp->show_all_children ();

    return true;
}


-- 
Best regards,
Sincerely yours,
Yuriy Rusinov.