1 // Copyright 2013 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_REMOTE_INPUT_METHOD_WIN_H_ 6 #define UI_BASE_IME_REMOTE_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 "base/memory/scoped_ptr.h" 15 #include "base/strings/string16.h" 16 #include "ui/base/ui_export.h" 17 #include "ui/gfx/native_widget_types.h" 18 19 namespace ui { 20 namespace internal { 21 class InputMethodDelegate; 22 class RemoteInputMethodDelegateWin; 23 } // namespace internal 24 25 class InputMethod; 26 struct CompositionText; 27 28 // RemoteInputMethodWin is a special implementation of ui::InputMethod that 29 // works as a proxy of an IME handler running in the metro_driver process. 30 // RemoteInputMethodWin works as follows. 31 // - Any action to RemoteInputMethodWin should be delegated to the 32 // metro_driver process via RemoteInputMethodDelegateWin. 33 // - Data retrieval from RemoteInputMethodPrivateWin is implemented with 34 // data cache. Whenever the IME state in the metro_driver process is changed, 35 // RemoteRootWindowHostWin, which receives IPCs from metro_driver process, 36 // will call RemoteInputMethodPrivateWin::OnCandidatePopupChanged and/or 37 // RemoteInputMethodPrivateWin::OnInputSourceChanged accordingly so that 38 // the state cache should be updated. 39 // - Some IPC messages that represent actions to TextInputClient should be 40 // delegated to RemoteInputMethodPrivateWin so that RemoteInputMethodWin can 41 // work as a real proxy. 42 43 // Returns true if |widget| requires RemoteInputMethodWin. 44 bool IsRemoteInputMethodWinRequired(gfx::AcceleratedWidget widget); 45 46 // Returns the public interface of RemoteInputMethodWin. 47 // Caveats: Currently only one instance of RemoteInputMethodWin is able to run 48 // at the same time. 49 UI_EXPORT scoped_ptr<InputMethod> CreateRemoteInputMethodWin( 50 internal::InputMethodDelegate* delegate); 51 52 // Private interface of RemoteInputMethodWin. 53 class UI_EXPORT RemoteInputMethodPrivateWin { 54 public: 55 RemoteInputMethodPrivateWin(); 56 57 // Returns the private interface of RemoteInputMethodWin when and only when 58 // |input_method| is instanciated via CreateRemoteInputMethodWin. Caller does 59 // not take the ownership of the returned object. 60 // As you might notice, this is yet another reinplementation of dynamic_cast 61 // or IUnknown::QueryInterface. 62 static RemoteInputMethodPrivateWin* Get(InputMethod* input_method); 63 64 // Installs RemoteInputMethodDelegateWin delegate. Set NULL to |delegate| to 65 // unregister. 66 virtual void SetRemoteDelegate( 67 internal::RemoteInputMethodDelegateWin* delegate) = 0; 68 69 // Updates internal cache so that subsequent calls of 70 // RemoteInputMethodWin::IsCandidatePopupOpen can return the correct value 71 // based on remote IME activities in the metro_driver process. 72 virtual void OnCandidatePopupChanged(bool visible) = 0; 73 74 // Updates internal cache so that subsequent calls of 75 // RemoteInputMethodWin::GetInputLocale and 76 // RemoteInputMethodWin::GetInputTextDirection can return the correct 77 // values based on remote IME activities in the metro_driver process. 78 virtual void OnInputSourceChanged(LANGID langid, bool is_ime) = 0; 79 80 // Handles composition-update events occurred in the metro_driver process. 81 // Caveats: This method is designed to be used only with 82 // metro_driver::TextService. In other words, there is no garantee that this 83 // method works a wrapper to call ui::TextInputClient::SetCompositionText. 84 virtual void OnCompositionChanged( 85 const CompositionText& composition_text) = 0; 86 87 // Handles text-commit events occurred in the metro_driver process. 88 // Caveats: This method is designed to be used only with 89 // metro_driver::TextService. In other words, there is no garantee that this 90 // method works a wrapper to call ui::TextInputClient::InsertText. In fact, 91 // this method may call ui::TextInputClient::InsertChar when the text input 92 // type of the focused text input client is TEXT_INPUT_TYPE_NONE. 93 virtual void OnTextCommitted(const base::string16& text) = 0; 94 95 private: 96 DISALLOW_COPY_AND_ASSIGN(RemoteInputMethodPrivateWin); 97 }; 98 99 } // namespace ui 100 101 #endif // UI_BASE_IME_REMOTE_INPUT_METHOD_WIN_H_ 102