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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Copyright © 2002 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Red Hat not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Red Hat makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL RED HAT
* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Owen Taylor, Red Hat, Inc.
*/
#include <config.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include "drw-selection.h"
struct _DrwSelection
{
GdkWindow *owner_window;
GtkWidget *invisible;
};
#define SELECTION_NAME "_CODEFACTORY_DRWRIGHT"
static GdkFilterReturn drw_selection_filter (GdkXEvent *xevent,
GdkEvent *event,
gpointer data);
static void drw_selection_negotiate (DrwSelection *drw_selection);
static void
drw_selection_reset (DrwSelection *drw_selection)
{
if (drw_selection->owner_window) {
gdk_window_remove_filter (drw_selection->owner_window,
drw_selection_filter, drw_selection);
g_object_unref (drw_selection->owner_window);
drw_selection->owner_window = NULL;
}
if (drw_selection->invisible) {
gtk_widget_destroy (drw_selection->invisible);
drw_selection->invisible = NULL;
}
}
static void
drw_selection_clear (GtkWidget *widget,
GdkEventSelection *event,
gpointer user_data)
{
DrwSelection *drw_selection = user_data;
drw_selection_reset (drw_selection);
drw_selection_negotiate (drw_selection);
}
static gboolean
drw_selection_find_existing (DrwSelection *drw_selection)
{
Display *xdisplay = GDK_DISPLAY ();
Window old;
gdk_error_trap_push ();
old = XGetSelectionOwner (xdisplay,
gdk_x11_get_xatom_by_name (SELECTION_NAME));
if (old) {
XSelectInput (xdisplay, old, StructureNotifyMask);
drw_selection->owner_window = gdk_window_foreign_new (old);
}
XSync (xdisplay, False);
if (gdk_error_trap_pop () == 0 && drw_selection->owner_window) {
gdk_window_add_filter (drw_selection->owner_window,
drw_selection_filter, drw_selection);
XUngrabServer (xdisplay);
return TRUE;
} else {
if (drw_selection->owner_window) {
g_object_unref (drw_selection->owner_window);
drw_selection->owner_window = NULL;
}
return FALSE;
}
}
static gboolean
drw_selection_claim (DrwSelection *drw_selection)
{
drw_selection->invisible = gtk_invisible_new ();
g_signal_connect (drw_selection->invisible, "selection-clear-event",
G_CALLBACK (drw_selection_clear), drw_selection);
if (gtk_selection_owner_set (drw_selection->invisible,
gdk_atom_intern (SELECTION_NAME, FALSE),
GDK_CURRENT_TIME)) {
return TRUE;
} else {
drw_selection_reset (drw_selection);
return FALSE;
}
}
static void
drw_selection_negotiate (DrwSelection *drw_selection)
{
Display *xdisplay = GDK_DISPLAY ();
gboolean found = FALSE;
/* We don't need both the XGrabServer() and the loop here;
* the XGrabServer() should make sure that we only go through
* the loop once. It also works if you remove the XGrabServer()
* and just have the loop, but then the selection ownership
* can get transfered a bunch of times before things
* settle down.
*/
while (!found)
{
XGrabServer (xdisplay);
if (drw_selection_find_existing (drw_selection))
found = TRUE;
else if (drw_selection_claim (drw_selection))
found = TRUE;
XUngrabServer (xdisplay);
}
}
static GdkFilterReturn
drw_selection_filter (GdkXEvent *xevent,
GdkEvent *event,
gpointer data)
{
DrwSelection *drw_selection = data;
XEvent *xev = (XEvent *)xevent;
if (xev->xany.type == DestroyNotify &&
xev->xdestroywindow.window == xev->xdestroywindow.event)
{
drw_selection_reset (drw_selection);
drw_selection_negotiate (drw_selection);
return GDK_FILTER_REMOVE;
}
return GDK_FILTER_CONTINUE;
}
DrwSelection *
drw_selection_start (void)
{
DrwSelection *drw_selection = g_new (DrwSelection, 1);
drw_selection->owner_window = NULL;
drw_selection->invisible = NULL;
drw_selection_negotiate (drw_selection);
return drw_selection;
}
void
drw_selection_stop (DrwSelection *drw_selection)
{
drw_selection_reset (drw_selection);
g_free (drw_selection);
}
gboolean
drw_selection_is_master (DrwSelection *drw_selection)
{
return drw_selection->invisible != NULL;
}
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