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/* Metacity X event source for main loop */
/*
* Copyright (C) 2001 Havoc Pennington (based on GDK code (C) Owen
* Taylor, Red Hat Inc.)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA. */
#include "eventqueue.h"
#include <X11/Xlib.h>
static gboolean eq_prepare (GSource *source,
gint *timeout);
static gboolean eq_check (GSource *source);
static gboolean eq_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data);
static void eq_destroy (GSource *source);
static GSourceFuncs eq_funcs = {
eq_prepare,
eq_check,
eq_dispatch,
eq_destroy
};
struct _MetaEventQueue
{
GSource source;
Display *display;
GPollFD poll_fd;
int connection_fd;
GQueue *events;
};
MetaEventQueue*
meta_event_queue_new (Display *display, MetaEventQueueFunc func, gpointer data)
{
GSource *source;
MetaEventQueue *eq;
source = g_source_new (&eq_funcs, sizeof (MetaEventQueue));
eq = (MetaEventQueue*) source;
eq->connection_fd = ConnectionNumber (display);
eq->poll_fd.fd = eq->connection_fd;
eq->poll_fd.events = G_IO_IN;
eq->events = g_queue_new ();
eq->display = display;
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_add_poll (source, &eq->poll_fd);
g_source_set_can_recurse (source, TRUE);
g_source_set_callback (source, (GSourceFunc) func, data, NULL);
g_source_attach (source, NULL);
return eq;
}
void
meta_event_queue_free (MetaEventQueue *eq)
{
GSource *source;
source = (GSource*) eq;
g_source_destroy (source);
}
static gboolean
eq_events_pending (MetaEventQueue *eq)
{
return eq->events->length > 0 || XPending (eq->display);
}
static void
eq_queue_events (MetaEventQueue *eq)
{
XEvent xevent;
while (XPending (eq->display))
{
XEvent *copy;
XNextEvent (eq->display, &xevent);
copy = g_new (XEvent, 1);
*copy = xevent;
g_queue_push_tail (eq->events, copy);
}
}
static gboolean
eq_prepare (GSource *source, gint *timeout)
{
MetaEventQueue *eq;
eq = (MetaEventQueue*) source;
*timeout = -1;
return eq_events_pending (eq);
}
static gboolean
eq_check (GSource *source)
{
MetaEventQueue *eq;
eq = (MetaEventQueue*) source;
if (eq->poll_fd.revents & G_IO_IN)
return eq_events_pending (eq);
else
return FALSE;
}
static gboolean
eq_dispatch (GSource *source, GSourceFunc callback, gpointer user_data)
{
MetaEventQueue *eq;
eq = (MetaEventQueue*) source;
eq_queue_events (eq);
if (eq->events->length > 0)
{
XEvent *event;
MetaEventQueueFunc func;
event = g_queue_pop_head (eq->events);
func = (MetaEventQueueFunc) callback;
(* func) (event, user_data);
g_free (event);
}
return TRUE;
}
static void
eq_destroy (GSource *source)
{
MetaEventQueue *eq;
eq = (MetaEventQueue*) source;
while (eq->events->length > 0)
{
XEvent *event;
event = g_queue_pop_head (eq->events);
g_free (event);
}
g_queue_free (eq->events);
/* source itself is freed by glib */
}
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