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_VIEWS_WIDGET_CHILD_WINDOW_MESSAGE_PROCESSOR_H_ 6 #define UI_VIEWS_WIDGET_CHILD_WINDOW_MESSAGE_PROCESSOR_H_ 7 8 #include <windows.h> 9 10 namespace ui { 11 class ViewProp; 12 } 13 14 namespace views { 15 16 // Windows sends a handful of messages to the parent window rather than the 17 // window itself. For example, selection changes of a rich edit (EN_SELCHANGE) 18 // are sent to the parent, not the window. Typically such message are best 19 // dealt with by the window rather than the parent. NativeWidgetWin allows for 20 // registering a ChildWindowMessageProcessor to handle such messages. 21 class ChildWindowMessageProcessor { 22 public: 23 // Registers |processor| for |hwnd|. The caller takes ownership of the 24 // returned object. 25 static ui::ViewProp* Register(HWND hwnd, 26 ChildWindowMessageProcessor* processor); 27 28 // Returns the ChildWindowMessageProcessor for |hwnd|, NULL if there isn't 29 // one. 30 static ChildWindowMessageProcessor* Get(HWND hwnd); 31 32 // Invoked for any messages that are sent to the parent and originated from 33 // the HWND this ChildWindowMessageProcessor was registered for. Returns true 34 // if the message was handled with a valid result in |result|. Returns false 35 // if the message was not handled. 36 virtual bool ProcessMessage(UINT message, 37 WPARAM w_param, 38 LPARAM l_param, 39 LRESULT* result) = 0; 40 41 protected: 42 virtual ~ChildWindowMessageProcessor() {} 43 }; 44 45 } // namespace views 46 47 #endif // UI_VIEWS_WIDGET_CHILD_WINDOW_MESSAGE_PROCESSOR_H_ 48
