Refactor the glib message-pump, and use it as the base for a gtk message pump and an X message pump.

base/message_pump_gtk.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/message_pump_gtk.h"
+
+#include <gtk/gtk.h>
+
+namespace base {
+
+MessagePumpGtk::MessagePumpGtk() : MessagePumpGlib() {
+  gdk_event_handler_set(&EventDispatcher, this, NULL);
+}
+
+MessagePumpGtk::~MessagePumpGtk() {
+  gdk_event_handler_set(reinterpret_cast<GdkEventFunc>(gtk_main_do_event),
+                        this, NULL);
+}
+
+void MessagePumpGtk::DispatchEvents(GdkEvent* event) {
+  WillProcessEvent(event);
+
+  MessagePumpDispatcher* dispatcher = GetDispatcher();
+  if (!dispatcher)
+    gtk_main_do_event(event);
+  else if (!dispatcher->Dispatch(event))
+    Quit();
+
+  DidProcessEvent(event);
+}
+
+bool MessagePumpGtk::RunOnce(GMainContext* context, bool block) {
+  // g_main_context_iteration returns true if events have been dispatched.
+  return g_main_context_iteration(context, block);
+}
+
+void MessagePumpGtk::WillProcessEvent(GdkEvent* event) {
+  FOR_EACH_OBSERVER(MessagePumpObserver, observers(), WillProcessEvent(event));
+}
+
+void MessagePumpGtk::DidProcessEvent(GdkEvent* event) {
+  FOR_EACH_OBSERVER(MessagePumpObserver, observers(), DidProcessEvent(event));
+}
+
+// static
+void MessagePumpGtk::EventDispatcher(GdkEvent* event, gpointer data) {
+  MessagePumpGtk* message_pump = reinterpret_cast<MessagePumpGtk*>(data);
+  message_pump->DispatchEvents(event);
+}
+
+}  // namespace base
+