src/ui/wm/core/input_method_event_filter.h

   1 // Copyright (c) 2012 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_WM_CORE_INPUT_METHOD_EVENT_FILTER_H_
   6 #define UI_WM_CORE_INPUT_METHOD_EVENT_FILTER_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/macros.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "ui/base/ime/input_method_delegate.h"
  12 #include "ui/events/event_handler.h"
  13 #include "ui/gfx/native_widget_types.h"
  14 #include "ui/wm/core/wm_core_export.h"
  15
  16 namespace ui {
  17 class EventProcessor;
  18 class InputMethod;
  19 }
  20
  21 namespace wm {
  22
  23 // An event filter that forwards a KeyEvent to a system IME, and dispatches a
  24 // TranslatedKeyEvent to the root window as needed.
  25 class WM_CORE_EXPORT InputMethodEventFilter
  26     : public ui::EventHandler,
  27       public ui::internal::InputMethodDelegate {
  28  public:
  29   explicit InputMethodEventFilter(gfx::AcceleratedWidget widget);
  30   virtual ~InputMethodEventFilter();
  31
  32   void SetInputMethodPropertyInRootWindow(aura::Window* root_window);
  33
  34   ui::InputMethod* input_method() const { return input_method_.get(); }
  35
  36  private:
  37   // Overridden from ui::EventHandler:
  38   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
  39
  40   // Overridden from ui::internal::InputMethodDelegate:
  41   virtual bool DispatchKeyEventPostIME(const ui::KeyEvent& event) OVERRIDE;
  42
  43   scoped_ptr<ui::InputMethod> input_method_;
  44
  45   // The target dispatcher that will receive translated key events from the IME.
  46   ui::EventProcessor* target_dispatcher_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(InputMethodEventFilter);
  49 };
  50
  51 }  // namespace wm
  52
  53 #endif  // UI_WM_CORE_INPUT_METHOD_EVENT_FILTER_H_