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      1 // Copyright (c) 2011 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_BASE_IME_INPUT_METHOD_WIN_H_
      6 #define UI_BASE_IME_INPUT_METHOD_WIN_H_
      7 
      8 #include <windows.h>
      9 
     10 #include <string>
     11 
     12 #include "base/basictypes.h"
     13 #include "base/compiler_specific.h"
     14 #include "ui/base/ime/input_method_base.h"
     15 #include "ui/base/ime/win/imm32_manager.h"
     16 
     17 namespace ui {
     18 
     19 // A common InputMethod implementation shared between IMM32 and TSF.
     20 class UI_EXPORT InputMethodWin : public InputMethodBase {
     21  public:
     22   InputMethodWin(internal::InputMethodDelegate* delegate,
     23                  HWND toplevel_window_handle);
     24 
     25   // Overridden from InputMethod:
     26   virtual void Init(bool focused) OVERRIDE;
     27   virtual bool DispatchKeyEvent(
     28       const base::NativeEvent& native_key_event) OVERRIDE;
     29   virtual bool DispatchFabricatedKeyEvent(const ui::KeyEvent& event) OVERRIDE;
     30   virtual void OnInputLocaleChanged() OVERRIDE;
     31   virtual std::string GetInputLocale() OVERRIDE;
     32   virtual base::i18n::TextDirection GetInputTextDirection() OVERRIDE;
     33   virtual bool IsActive() OVERRIDE;
     34 
     35  protected:
     36   // Some IMEs rely on WM_IME_REQUEST message even when TSF is enabled. So
     37   // OnImeRequest (and its actual implementations as OnDocumentFeed,
     38   // OnReconvertString, and OnQueryCharPosition) are placed in this base class.
     39   LRESULT OnImeRequest(UINT message,
     40                        WPARAM wparam,
     41                        LPARAM lparam,
     42                        BOOL* handled);
     43   // For both WM_CHAR and WM_SYSCHAR
     44   LRESULT OnChar(HWND window_handle,
     45                  UINT message,
     46                  WPARAM wparam,
     47                  LPARAM lparam,
     48                  BOOL* handled);
     49   // For both WM_DEADCHAR and WM_SYSDEADCHAR
     50   LRESULT OnDeadChar(UINT message, WPARAM wparam, LPARAM lparam, BOOL* handled);
     51 
     52   LRESULT OnDocumentFeed(RECONVERTSTRING* reconv);
     53   LRESULT OnReconvertString(RECONVERTSTRING* reconv);
     54   LRESULT OnQueryCharPosition(IMECHARPOSITION* char_positon);
     55 
     56   // Returns the window handle to which |text_input_client| is bound.
     57   // On Aura environment, |toplevel_window_handle_| is always returned.
     58   HWND GetAttachedWindowHandle(const TextInputClient* text_input_client) const;
     59 
     60   // Indicates if the current input locale has an IME.
     61   bool active_;
     62 
     63   // Windows IMM32 wrapper.
     64   // (See "ui/base/ime/win/ime_input.h" for its details.)
     65   ui::IMM32Manager imm32_manager_;
     66 
     67  private:
     68   // The toplevel window handle.
     69   // On non-Aura environment, this value is not used and always NULL.
     70   const HWND toplevel_window_handle_;
     71 
     72   // Name of the current input locale.
     73   std::string locale_;
     74 
     75   // The current input text direction.
     76   base::i18n::TextDirection direction_;
     77 
     78   // The new text direction and layout alignment requested by the user by
     79   // pressing ctrl-shift. It'll be sent to the text input client when the key
     80   // is released.
     81   base::i18n::TextDirection pending_requested_direction_;
     82 
     83   DISALLOW_COPY_AND_ASSIGN(InputMethodWin);
     84 };
     85 
     86 }  // namespace ui
     87 
     88 #endif  // UI_BASE_IME_INPUT_METHOD_WIN_H_
     89