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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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