1 // Copyright (c) 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_BASE_WIN_WINDOW_EVENT_TARGET_H_ 6 #define UI_BASE_WIN_WINDOW_EVENT_TARGET_H_ 7 8 #include <windows.h> 9 10 #include "base/basictypes.h" 11 #include "ui/base/ui_base_export.h" 12 13 namespace ui { 14 15 // This interface is implemented by classes who get input events forwarded to 16 // them from others. E.g. would be a win32 parent child relationship where the 17 // child forwards input events to the parent after doing minimal processing. 18 class UI_BASE_EXPORT WindowEventTarget { 19 public: 20 static const char kWin32InputEventTarget[]; 21 22 // Handles mouse events like WM_MOUSEMOVE, WM_LBUTTONDOWN, etc. 23 // The |message| parameter identifies the message. 24 // The |w_param| and |l_param| values are dependent on the type of the 25 // message. 26 // Returns the result of processing the message. 27 virtual LRESULT HandleMouseMessage(unsigned int message, 28 WPARAM w_param, 29 LPARAM l_param) = 0; 30 31 // Handles keyboard events like WM_KEYDOWN/WM_KEYUP, etc. 32 // The |message| parameter identifies the message. 33 // The |w_param| and |l_param| values are dependent on the type of the 34 // message. 35 // Returns the result of processing the message. 36 virtual LRESULT HandleKeyboardMessage(unsigned int message, 37 WPARAM w_param, 38 LPARAM l_param) = 0; 39 40 // Handles WM_TOUCH events. 41 // The |message| parameter identifies the message. 42 // The |w_param| and |l_param| values are as per MSDN docs. 43 // Returns the result of processing the message. 44 virtual LRESULT HandleTouchMessage(unsigned int message, 45 WPARAM w_param, 46 LPARAM l_param) = 0; 47 48 // Handles scroll messages like WM_VSCROLL and WM_HSCROLL. 49 // The |message| parameter identifies the scroll message. 50 // The |w_param| and |l_param| values are dependent on the type of scroll. 51 virtual LRESULT HandleScrollMessage(unsigned int message, 52 WPARAM w_param, 53 LPARAM l_param) = 0; 54 55 // Handles the WM_NCHITTEST message 56 // The |message| parameter identifies the message. 57 // The |w_param| and |l_param| values are as per MSDN docs. 58 // Returns the result of processing the message. 59 virtual LRESULT HandleNcHitTestMessage(unsigned int message, 60 WPARAM w_param, 61 LPARAM l_param) = 0; 62 protected: 63 WindowEventTarget(); 64 virtual ~WindowEventTarget(); 65 }; 66 67 } // namespace ui 68 69 #endif // UI_BASE_WIN_WINDOW_EVENT_TARGET_H_ 70 71 72
