gtk: Allow building both the X11 and Gtk message-pumps for gtk.

base/message_loop/message_pump_aurax11.h

-// Copyright (c) 2012 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_LOOP_MESSAGE_PUMP_AURAX11_H
-#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_AURAX11_H
-
-#include <bitset>
-#include <map>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_pump.h"
-#include "base/message_loop/message_pump_dispatcher.h"
-#include "base/message_loop/message_pump_glib.h"
-#include "base/message_loop/message_pump_observer.h"
-#include "base/observer_list.h"
-
-// It would be nice to include the X11 headers here so that we use Window
-// instead of its typedef of unsigned long, but we can't because everything in
-// chrome includes us through base/message_loop/message_loop.h, and X11's crappy
-// #define heavy headers muck up half of chrome.
-
-typedef struct _GPollFD GPollFD;
-typedef struct _GSource GSource;
-typedef struct _XDisplay Display;
-
-namespace base {
-
-// This class implements a message-pump for dispatching X events.
-//
-// If there's a current dispatcher given through RunWithDispatcher(), that
-// dispatcher receives events. Otherwise, we route to messages to dispatchers
-// who have subscribed to messages from a specific X11 window.
-class BASE_EXPORT MessagePumpAuraX11 : public MessagePumpGlib,
-                                       public MessagePumpDispatcher {
- public:
-  MessagePumpAuraX11();
-  virtual ~MessagePumpAuraX11();
-
-  // Returns default X Display.
-  static Display* GetDefaultXDisplay();
-
-  // Returns true if the system supports XINPUT2.
-  static bool HasXInput2();
-
-  // Returns the UI message pump.
-  static MessagePumpAuraX11* Current();
-
-  // Adds/Removes |dispatcher| for the |xid|. This will route all messages from
-  // the window |xid| to |dispatcher.
-  void AddDispatcherForWindow(MessagePumpDispatcher* dispatcher,
-                              unsigned long xid);
-  void RemoveDispatcherForWindow(unsigned long xid);
-
-  // Adds/Removes |dispatcher| to receive all events sent to the X root
-  // window. A root window can have multiple dispatchers, and events on root
-  // windows will be dispatched to all.
-  void AddDispatcherForRootWindow(MessagePumpDispatcher* dispatcher);
-  void RemoveDispatcherForRootWindow(MessagePumpDispatcher* dispatcher);
-
-  // Adds an Observer, which will start receiving notifications immediately.
-  void AddObserver(MessagePumpObserver* observer);
-
-  // Removes an Observer.  It is safe to call this method while an Observer is
-  // receiving a notification callback.
-  void RemoveObserver(MessagePumpObserver* observer);
-
-  // Internal function. Called by the glib source dispatch function. Processes
-  // all available X events.
-  bool DispatchXEvents();
-
-  // Blocks on the X11 event queue until we receive notification from the
-  // xserver that |w| has been mapped; StructureNotifyMask events on |w| are
-  // pulled out from the queue and dispatched out of order.
-  //
-  // For those that know X11, this is really a wrapper around XWindowEvent
-  // which still makes sure the preempted event is dispatched instead of
-  // dropped on the floor. This method exists because mapping a window is
-  // asynchronous (and we receive an XEvent when mapped), while there are also
-  // functions which require a mapped window.
-  void BlockUntilWindowMapped(unsigned long xid);
-
- private:
-  typedef std::map<unsigned long, MessagePumpDispatcher*> DispatchersMap;
-
-  // Initializes the glib event source for X.
-  void InitXSource();
-
-  // Dispatches the XEvent and returns true if we should exit the current loop
-  // of message processing.
-  bool ProcessXEvent(MessagePumpDispatcher* dispatcher, 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);
-  void DidProcessXEvent(XEvent* xevent);
-
-  // Returns the Dispatcher based on the event's target window.
-  MessagePumpDispatcher* GetDispatcherForXEvent(const NativeEvent& xev) const;
-
-  ObserverList<MessagePumpObserver>& observers() { return observers_; }
-
-  // Overridden from MessagePumpDispatcher:
-  virtual bool Dispatch(const NativeEvent& event) OVERRIDE;
-
-  // The event source for X events.
-  GSource* x_source_;
-
-  // The poll attached to |x_source_|.
-  scoped_ptr<GPollFD> x_poll_;
-
-  DispatchersMap dispatchers_;
-
-  // Dispatch calls can cause addition of new dispatchers as we iterate
-  // through them. Use ObserverList to ensure the iterator remains valid across
-  // additions.
-  ObserverList<MessagePumpDispatcher> root_window_dispatchers_;
-
-  // List of observers.
-  ObserverList<MessagePumpObserver> observers_;
-
-  unsigned long x_root_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessagePumpAuraX11);
-};
-
-typedef MessagePumpAuraX11 MessagePumpForUI;
-
-}  // namespace base
-
-#endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_AURAX11_H