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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef UI_BASE_WIN_MOUSE_WHEEL_UTIL_H_ | 5 #ifndef UI_BASE_WIN_MOUSE_WHEEL_UTIL_H_ |
| 6 #define UI_BASE_WIN_MOUSE_WHEEL_UTIL_H_ | 6 #define UI_BASE_WIN_MOUSE_WHEEL_UTIL_H_ |
| 7 | 7 |
| 8 #include <windows.h> | 8 #include <windows.h> |
| 9 | 9 |
| 10 #include "ui/base/ui_export.h" | 10 #include "ui/base/ui_base_export.h" |
| 11 | 11 |
| 12 namespace ui { | 12 namespace ui { |
| 13 | 13 |
| 14 class ViewProp; | 14 class ViewProp; |
| 15 | 15 |
| 16 // Marks the passed |hwnd| as supporting mouse-wheel message rerouting. | 16 // Marks the passed |hwnd| as supporting mouse-wheel message rerouting. |
| 17 // We reroute the mouse wheel messages to such HWND when they are under the | 17 // We reroute the mouse wheel messages to such HWND when they are under the |
| 18 // mouse pointer (but are not the active window). Callers own the returned | 18 // mouse pointer (but are not the active window). Callers own the returned |
| 19 // object. | 19 // object. |
| 20 UI_EXPORT ViewProp* SetWindowSupportsRerouteMouseWheel(HWND hwnd); | 20 UI_BASE_EXPORT ViewProp* SetWindowSupportsRerouteMouseWheel(HWND hwnd); |
| 21 | 21 |
| 22 // Forwards mouse wheel messages to the window under it. | 22 // Forwards mouse wheel messages to the window under it. |
| 23 // Windows sends mouse wheel messages to the currently active window. | 23 // Windows sends mouse wheel messages to the currently active window. |
| 24 // This causes a window to scroll even if it is not currently under the mouse | 24 // This causes a window to scroll even if it is not currently under the mouse |
| 25 // wheel. The following code gives mouse wheel messages to the window under the | 25 // wheel. The following code gives mouse wheel messages to the window under the |
| 26 // mouse wheel in order to scroll that window. This is arguably a better user | 26 // mouse wheel in order to scroll that window. This is arguably a better user |
| 27 // experience. The returns value says whether the mouse wheel message was | 27 // experience. The returns value says whether the mouse wheel message was |
| 28 // successfully redirected. | 28 // successfully redirected. |
| 29 UI_EXPORT bool RerouteMouseWheel(HWND window, WPARAM w_param, | 29 UI_BASE_EXPORT bool RerouteMouseWheel(HWND window, |
| 30 LPARAM l_param); | 30 WPARAM w_param, |
| 31 LPARAM l_param); |
| 31 | 32 |
| 32 } // namespace ui | 33 } // namespace ui |
| 33 | 34 |
| 34 #endif // UI_BASE_WIN_MOUSE_WHEEL_UTIL_H_ | 35 #endif // UI_BASE_WIN_MOUSE_WHEEL_UTIL_H_ |
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