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authorrhp <rhp>2001-05-30 15:36:31 +0000
committerrhp <rhp>2001-05-30 15:36:31 +0000
commit287b6b15d3840d6546bbc55f9dbd7b3d098429c3 (patch)
tree6333e26040b816dc8646a371c6499f7a51f0a6cc /src/eventqueue.c
downloadmetacity-287b6b15d3840d6546bbc55f9dbd7b3d098429c3.tar.gz
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Diffstat (limited to 'src/eventqueue.c')
-rw-r--r--src/eventqueue.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/src/eventqueue.c b/src/eventqueue.c
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+++ b/src/eventqueue.c
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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 <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) (eq, 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 */
+}