Re: Custom widget painting with GtkStyle

[Artur Galyamov <artur-pub yandex ru>]

Hi, Sebastian!

static gboolean
expose_event(GtkWidget *widget, GdkEventExpose *event)
{
    static GtkStyle *style = NULL;

    int x = widget->allocation.x;
    int y = widget->allocation.y;
    int width = widget->allocation.width;
    int height = widget->allocation.height;

    if (!style)
        // key phrase:
        style = gtk_rc_get_style_by_paths(gtk_settings_get_default(), NULL,
            "GtkButton", GTK_TYPE_BUTTON);

    gtk_style_attach(style, widget->window);

    gtk_paint_box(style, widget->window,
        GTK_STATE_NORMAL,
        GTK_SHADOW_OUT, &event->area,
        widget, "button",
        x, y, width, height);

    gtk_style_detach(style);
    return FALSE;
}

Style engine may or may not heavily depend on widget's class or even
properties, so don't expect exact emulation for all classes on all
engines. I think it is why things are not documented.

See $SRC/gtk/gtkbutton.c on how to paint button's focus, default, etc
exactly as GtkButton does.

-- 
Artur

19.12.09, 14:09, "Sebastian PajÄk" <spconv+m gmail com>:

> Hi
> I'm trying to create a shape for my custom widget using GtkStyle
> (gtk_paint func. family). For a start I want a shape like a button has
> (shadow + relief). This is my code for expose event:
> static int
> clv_expose(GtkWidget *widget, GdkEventExpose *event) // clv is a
> subclass of GtkConainer
> {
>     int x = widget->allocation.x;
>     int y = widget->allocation.y;
>     int width = widget->allocation.width;
>     int height = widget->allocation.height;
>     gtk_paint_box(widget->style, widget->window,
>                   GTK_STATE_NORMAL,
>                   GTK_SHADOW_IN, &event->area,
>                   widget, "button",
>                   x+4, y+4, width-8, height-8);
>     std::printf("EXPOSE");
>     return FALSE;
> }
> clv_expose is connected and is called. Unfortunately it doesn't work.
> Only empty, flat window is showing, no shadow like in a button. Do you
> know what can be wrong? Is GtkConainer good for sublassing in this
> situation?
> I cannot find any info on gtk/gdk drawing using google (only cairo).
> Gtk API reference is very poor abou it. Some hints, simple exmples or
> howtos will be helpful for a GTK+ beginner like me :).
> Thanks in advance
> Sebastian
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