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