Block internal PlatformEvents before they are dispatched in touchview.

ash/wm/maximize_mode/maximize_mode_event_blocker.h

 // Copyright 2014 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 ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_BLOCKER_H_
 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_BLOCKER_H_
 
 #include <set>
 
-#include "ash/shell_observer.h"
+#include "ash/ash_export.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/memory/scoped_vector.h"
-#include "ui/aura/scoped_window_targeter.h"
-
-namespace aura {
-class Window;
-}  // namespace aura
+#include "ui/events/platform/platform_event_filter.h"
+#include "ui/gfx/point.h"
 
 namespace ash {
 
 class InternalInputDeviceList;
-class MaximizeModeControllerTest;
+class MaximizeModeEventBlockerX11Test;
 
 // A class which blocks mouse and keyboard events while instantiated by
 // replacing the root window event targeter.
-class MaximizeModeEventBlocker : public ShellObserver {
+class ASH_EXPORT MaximizeModeEventBlocker : public ui::PlatformEventFilter {
  public:
   MaximizeModeEventBlocker();
   virtual ~MaximizeModeEventBlocker();
 
-  InternalInputDeviceList* internal_devices() {
-    return internal_devices_.get();
-  }
-
-  // ShellObserver:
-  virtual void OnRootWindowAdded(aura::Window* root_window) OVERRIDE;
+  // ui::PlatformEventFilter:
+  virtual bool ShouldDispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
 
  private:
-  friend class MaximizeModeControllerTest;
+  friend class MaximizeModeEventBlockerX11Test;
 
-  // Adds an event targeter on |root_window| to block mouse and keyboard events.
-  void AddEventTargeterOn(aura::Window* root_window);
+  // The last known mouse location to lock the cursor in place to when events
+  // come from the internal touchpad.
+  gfx::Point last_mouse_location_;
 
-  ScopedVector<aura::ScopedWindowTargeter> targeters_;
   scoped_ptr<InternalInputDeviceList> internal_devices_;
 
   DISALLOW_COPY_AND_ASSIGN(MaximizeModeEventBlocker);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_BLOCKER_H_