root/ui/views/widget/desktop_aura/x11_desktop_handler.h

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INCLUDED FROM

// 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 UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_
#define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_

#include <X11/Xlib.h>
// Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
#undef RootWindow

#include <vector>

#include "base/message_loop/message_pump_dispatcher.h"
#include "ui/aura/env_observer.h"
#include "ui/gfx/x/x11_atom_cache.h"
#include "ui/gfx/x/x11_types.h"
#include "ui/views/views_export.h"

template <typename T> struct DefaultSingletonTraits;

namespace views {

// A singleton that owns global objects related to the desktop and listens for
// X11 events on the X11 root window. Destroys itself when aura::Env is
// deleted.
class VIEWS_EXPORT X11DesktopHandler : public base::MessagePumpDispatcher,
                                       public aura::EnvObserver {
 public:
  // Returns the singleton handler.
  static X11DesktopHandler* get();

  // Sends a request to the window manager to activate |window|.
  // This method should only be called if the window is already mapped.
  void ActivateWindow(::Window window);

  // Checks if the current active window is |window|.
  bool IsActiveWindow(::Window window) const;

  // Processes activation/focus related events. Some of these events are
  // dispatched to the X11 window dispatcher, and not to the X11 root-window
  // dispatcher. The window dispatcher sends these events to here.
  void ProcessXEvent(const base::NativeEvent& event);

  // Overridden from MessagePumpDispatcher:
  virtual uint32_t Dispatch(const base::NativeEvent& event) OVERRIDE;

  // Overridden from aura::EnvObserver:
  virtual void OnWindowInitialized(aura::Window* window) OVERRIDE;
  virtual void OnWillDestroyEnv() OVERRIDE;

 private:
  explicit X11DesktopHandler();
  virtual ~X11DesktopHandler();

  // Handles changes in activation.
  void OnActiveWindowChanged(::Window window);

  // The display and the native X window hosting the root window.
  XDisplay* xdisplay_;

  // The native root window.
  ::Window x_root_window_;

  // The activated window.
  ::Window current_window_;

  ui::X11AtomCache atom_cache_;

  bool wm_supports_active_window_;

  DISALLOW_COPY_AND_ASSIGN(X11DesktopHandler);
};

}  // namespace views

#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_
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