ui/views/event_monitor.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_VIEWS_EVENT_MONITOR_H_
   6 #define UI_VIEWS_EVENT_MONITOR_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "ui/gfx/geometry/point.h"
  10 #include "ui/gfx/native_widget_types.h"
  11 #include "ui/views/views_export.h"
  12
  13 namespace ui {
  14 class EventHandler;
  15 }
  16
  17 namespace views {
  18
  19 // RAII-style class that forwards events to |event_handler| before they are
  20 // dispatched.
  21 class VIEWS_EXPORT EventMonitor {
  22  public:
  23   virtual ~EventMonitor() {}
  24
  25   // Create an instance for monitoring application events.
  26   // Events will be forwarded to |event_handler| before they are dispatched to
  27   // the application.
  28   static scoped_ptr<EventMonitor> CreateApplicationMonitor(
  29       ui::EventHandler* event_handler);
  30
  31   // Create an instance for monitoring events on a specific window.
  32   // Events will be forwarded to |event_handler| before they are dispatched to
  33   // |target_window|.
  34   // The EventMonitor instance must be destroyed before |target_window|.
  35   static scoped_ptr<EventMonitor> CreateWindowMonitor(
  36       ui::EventHandler* event_handler,
  37       gfx::NativeWindow target_window);
  38
  39   // Returns the last mouse location seen in a mouse event in screen
  40   // coordinates.
  41   static gfx::Point GetLastMouseLocation();
  42 };
  43
  44 }  // namespace views
  45
  46 #endif  // UI_VIEWS_EVENT_MONITOR_H_