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/*
* Copyright (C) 2007 Ross Burton <ross@openedhand.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <string.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include "owlwindowmenu.h"
#define MENU_PROP "owl::windowmenu"
static Atom atom_custom, atom_protocol;
/*
* Ensures that the atoms we need are defined.
*/
static void
ensure_atoms (GdkDrawable *drawable)
{
static gboolean done = FALSE;
if (G_UNLIKELY (!done)) {
GdkDisplay *display = gdk_drawable_get_display (drawable);
atom_custom = gdk_x11_get_xatom_by_name_for_display
(display, "_NET_WM_CONTEXT_CUSTOM");
atom_protocol = gdk_x11_get_xatom_by_name_for_display
(display, "WM_PROTOCOLS");
g_assert (atom_custom);
g_assert (atom_protocol);
done = TRUE;
}
}
/*
* Menu positioning function, called by gtk_menu_popup.
*/
static void
position_func (GtkMenu *menu,
gint *x,
gint *y,
gboolean *push_in,
gpointer user_data)
{
GtkWidget *window = user_data;
/*
* Set the position of the menu to the origin of the window. This means that
* the menu is in the top left of the application window. It might be
* interesting to see if the theme could specify an offset, so that the menu
* aligns itself with the decorations.
*/
gdk_window_get_origin (window->window, x, y);
}
/*
* Gdk event filter. This should be as fast as possible for non-client messages
* as it gets called *frequently*.
*/
static GdkFilterReturn
filter_func (GdkXEvent *xevent, GdkEvent *event, gpointer data)
{
if (G_UNLIKELY (((XEvent*)xevent)->type == ClientMessage)) {
XClientMessageEvent *xev = xevent;
if (xev->message_type == atom_protocol) {
Atom protocol = xev->data.l[0];
if (protocol == atom_custom) {
GtkMenu *menu;
/* Sanity check the user data is the window */
g_return_val_if_fail (GTK_IS_WINDOW (data), GDK_FILTER_CONTINUE);
menu = g_object_get_data (G_OBJECT (data), MENU_PROP);
if (menu) {
gtk_menu_popup (menu, NULL, NULL,
position_func, data,
0, gtk_get_current_event_time());
}
return GDK_FILTER_REMOVE;
}
}
}
return GDK_FILTER_CONTINUE;
}
/**
* owl_set_window_menu:
* @window: a top-level #GtkWindow
* @menu: a #GtkMenu
*
* Make @menu pop up when the CUSTOM protocol is sent to @window. This means
* that when the user clicks on the title bar with a suitable window manager,
* the menu appears.
*/
void
owl_set_window_menu (GtkWindow *window, GtkMenu *menu)
{
gboolean done_setup;
GdkWindow *w;
Status status;
Atom *old_atoms = NULL, *atoms;
int count = 0;
g_return_if_fail (GTK_IS_WINDOW (window));
/* TODO: allow NULL menu to unset? */
g_return_if_fail (GTK_IS_MENU (menu));
w = GTK_WIDGET (window)->window;
/* Make sure the atoms we need are defined */
ensure_atoms (w);
/* We only need to setup if the property isn't already set */
done_setup = g_object_get_data (G_OBJECT (window), MENU_PROP) != NULL;
/* Set the menu. If there is a menu already defined, it will be unreffed */
g_object_set_data_full (G_OBJECT (window), MENU_PROP, g_object_ref (menu), g_object_unref);
/* It's possible that we are replacing the menu with another menu, so the
filters and so on are already registered. */
if (done_setup)
return;
/* Get the protocols supported by this window */
status = XGetWMProtocols(GDK_WINDOW_XDISPLAY (w), GDK_WINDOW_XID (w),
&old_atoms, &count);
/* TODO: check error */
/* TODO: check if old_atoms already contains custom */
/* Add _NEW_WM_CONTEXT_CUSTOM to the list */
atoms = g_new0 (Atom, count+1);
memcpy (atoms, old_atoms, count * sizeof (Atom));
atoms[count] = atom_custom;
/* And set the list */
XSetWMProtocols (GDK_WINDOW_XDISPLAY (w), GDK_WINDOW_XID (w), atoms, count+1);
/* TODO: check error */
XFree (old_atoms);
g_free (atoms);
/* Add a filter so that we can catch the CUSTOM event and display the menu. */
gdk_window_add_filter (w, filter_func, window);
}
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