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

base/message_pump_glib_x.h

-// 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.
-
-#ifndef BASE_MESSAGE_PUMP_GLIB_X_H
-#define BASE_MESSAGE_PUMP_GLIB_X_H
-
-#include "base/message_pump.h"
-#include "base/message_pump_glib.h"
-
-#include <bitset>
-
-#include <glib.h>
-#include <gtk/gtk.h>
-#include <X11/X.h>
-
-typedef union _XEvent XEvent;
-
-namespace base {
-
-class MessagePumpGlibX : public MessagePumpForUI {
- public:
-  MessagePumpGlibX();
-  virtual ~MessagePumpGlibX();
-
-  // Indicates whether a GDK event was injected by chrome (when |true|) or if it
-  // was captured and being processed by GDK (when |false|).
-  bool IsDispatchingEvent(void) { return dispatching_event_; }
-
-  // Overridden from MessagePumpForUI:
-  virtual bool RunOnce(GMainContext* context, bool block);
-
- private:
-  // Some XEvent's can't be directly read from X event queue and will go
-  // through GDK's dispatching process and may get discarded. This function
-  // sets up a filter to intercept those XEvent's we are interested in
-  // and dispatches them so that they won't get lost.
-  static GdkFilterReturn GdkEventFilter(GdkXEvent* gxevent,
-                                        GdkEvent* gevent,
-                                        gpointer data);
-
-  static void EventDispatcherX(GdkEvent* event, gpointer data);
-
-  // Decides whether we are interested in processing this XEvent.
-  bool ShouldCaptureXEvent(XEvent* event);
-
-  // Dispatches the XEvent and returns true if we should exit the current loop
-  // of message processing.
-  bool ProcessXEvent(XEvent* event);
-
-  // Sends the event to the observers. If an observer returns true, then it does
-  // not send the event to any other observers and returns true. Returns false
-  // if no observer returns true.
-  bool WillProcessXEvent(XEvent* xevent);
-
-  // Update the lookup table and flag the events that should be captured and
-  // processed so that GDK doesn't get to them.
-  void InitializeEventsToCapture(void);
-
-#if defined(HAVE_XINPUT2)
-  // Initialize X2 input.
-  void InitializeXInput2(void);
-
-  // The opcode used for checking events.
-  int xiopcode_;
-#endif
-
-  // The event source for GDK events.
-  GSource* gdksource_;
-
-  // The default GDK event dispatcher. This is stored so that it can be restored
-  // when necessary during nested event dispatching.
-  gboolean (*gdkdispatcher_)(GSource*, GSourceFunc, void*);
-
-  // Indicates whether a GDK event was injected by chrome (when |true|) or if it
-  // was captured and being processed by GDK (when |false|).
-  bool dispatching_event_;
-
-#if ! GTK_CHECK_VERSION(2,18,0)
-// GDK_EVENT_LAST was introduced in GTK+ 2.18.0. For earlier versions, we pick a
-// large enough value (the value of GDK_EVENT_LAST in 2.18.0) so that it works
-// for all versions.
-#define GDK_EVENT_LAST 37
-#endif
-
-  // We do not want to process all the events ourselves. So we use a lookup
-  // table to quickly check if a particular event should be handled by us or if
-  // it should be passed on to the default GDK handler.
-  std::bitset<LASTEvent> capture_x_events_;
-  std::bitset<GDK_EVENT_LAST> capture_gdk_events_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessagePumpGlibX);
-};
-
-}  // namespace base
-
-#endif  // BASE_MESSAGE_PUMP_GLIB_X_H