views/focus/focus_util_win.h

   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 VIEWS_FOCUS_FOCUS_UTIL_WIN_H_
   6 #define VIEWS_FOCUS_FOCUS_UTIL_WIN_H_
   7 #pragma once
   8
   9 #include <windows.h>
  10
  11 #include "views/views_api.h"
  12
  13 namespace ui {
  14 class ViewProp;
  15 }
  16
  17 namespace views {
  18
  19 // Marks the passed |hwnd| as supporting mouse-wheel message rerouting.
  20 // We reroute the mouse wheel messages to such HWND when they are under the
  21 // mouse pointer (but are not the active window). Callers own the returned
  22 // object.
  23 VIEWS_API ui::ViewProp* SetWindowSupportsRerouteMouseWheel(HWND hwnd);
  24
  25 // Forwards mouse wheel messages to the window under it.
  26 // Windows sends mouse wheel messages to the currently active window.
  27 // This causes a window to scroll even if it is not currently under the mouse
  28 // wheel. The following code gives mouse wheel messages to the window under the
  29 // mouse wheel in order to scroll that window. This is arguably a better user
  30 // experience.  The returns value says whether the mouse wheel message was
  31 // successfully redirected.
  32 VIEWS_API bool RerouteMouseWheel(HWND window, WPARAM w_param, LPARAM l_param);
  33
  34 }   // namespace views
  35
  36 #endif  // VIEWS_FOCUS_FOCUS_UTIL_WIN_H_