Re: Custom widget painting with GtkStyle

[Artur Galyamov <artur-pub yandex ru>]

Hmm...
I just found theme on my box, that caused problem too (Raleigh). Do
you see any warnings/errors in console while running?

(a.out:51454): Gtk-CRITICAL **: gtk_paint_box: assertion `GTK_IS_STYLE (style)' failed

If yes, following may help...
(works now with all themes i have + proper style refcounting).

==============================================================
#include <gtk/gtk.h>

static GtkWidget *window = NULL;

static gboolean
expose_event(GtkWidget *widget, GdkEventExpose *event)
{
    GtkStyle *style;
    int was_created;

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

    was_created = TRUE &&
        (style = gtk_rc_get_style_by_paths(gtk_widget_get_settings(widget),
            NULL, "GtkButton", GTK_TYPE_BUTTON));
    printf("was_created %d\n", was_created);

    if (was_created)
        style = gtk_style_attach(gtk_style_ref(style), widget->window);
    else
        style = widget->style;

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

    if (was_created) {
        gtk_style_detach(style);
        gtk_style_unref(style);
    }

    return FALSE;
}

static GtkWidget *
create_widget(void)
{
    GtkWidget *vbox = gtk_vbox_new(FALSE, 4);
    GtkWidget *btn0 = gtk_vbox_new(FALSE, 0);
    GtkWidget *btn1 = gtk_button_new();
    GtkWidget *btn2 = gtk_button_new();

    GTK_WIDGET_SET_FLAGS(btn0, GTK_APP_PAINTABLE);

    g_signal_connect(btn0, "expose-event",
        (GCallback) expose_event, NULL);
    gtk_box_pack_start(GTK_BOX(vbox), btn0, 1, 1, 0);
    gtk_box_pack_start(GTK_BOX(vbox), btn1, 1, 1, 0);
    gtk_box_pack_start(GTK_BOX(vbox), btn2, 1, 1, 0);

    gtk_container_set_border_width(GTK_CONTAINER(vbox), 4);
    gtk_widget_show_all(vbox);
    return vbox;
}

int
main(int argc, char *argv[])
{
    gtk_init(&argc, &argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW(window), 400, 300);
    auto void on_destroy(void);
    auto void on_destroy(void) { gtk_main_quit(); }
    g_signal_connect(window, "destroy", (GCallback) on_destroy, NULL);
    gtk_container_add(GTK_CONTAINER(window), create_widget());
    gtk_widget_show(window);
    gtk_main();
    return 0;
}
==============================================================

ps. just googled: Raleigh is "no-engine" theme, maybe "MS-Windows"
is same for win32??

-- 
Artur

20.12.09, 23:00, "Sebastian PajÄk" <spconv+m gmail com>:

> Thanks. The code compiles, but the painted box doesn't appear also.
> But the fault is somewhere else. I found gtk_paint_box doesn't work
> with MS-Windows theme only. With any other theme no problem exists
> (yes, I use gtk+ on win xp). It's weird because GtkButton also calls
> this function and there is no problem drawing it even with MS-Windows
> theme. I have no idea why it is so. Need to study gtk+ source more...
> Sebastian