moving from https://github.com/perberos/mate-desktop-environment

1 files changed, 184 insertions, 0 deletions

diff --git a/src/core/eventqueue.c b/src/core/eventqueue.c
new file mode 100644
index 00000000..2799cae9
--- /dev/null
+++ b/src/core/eventqueue.c
@@ -0,0 +1,184 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/* Marco 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);
+  g_source_unref (source);
+
+  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 */
+}