1 files changed, 28 insertions, 0 deletions
diff --git a/views/focus/focus_util_win.h b/views/focus/focus_util_win.h
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+++ b/views/focus/focus_util_win.h
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+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef VIEWS_FOCUS_FOCUS_UTIL_WIN_H_
+#define VIEWS_FOCUS_FOCUS_UTIL_WIN_H_
+
+#include <windows.h>
+
+namespace views {
+
+// Marks the passed |hwnd| as supporting mouse-wheel message rerouting.
+// We reroute the mouse wheel messages to such HWND when they are under the
+// mouse pointer (but are not the active window)
+void SetWindowSupportsRerouteMouseWheel(HWND hwnd);
+
+// Forwards mouse wheel messages to the window under it.
+// Windows sends mouse wheel messages to the currently active window.
+// This causes a window to scroll even if it is not currently under the mouse
+// wheel. The following code gives mouse wheel messages to the window under the
+// mouse wheel in order to scroll that window. This is arguably a better user
+// experience.  The returns value says whether the mouse wheel message was
+// successfully redirected.
+bool RerouteMouseWheel(HWND window, WPARAM w_param, LPARAM l_param);
+
+}   // namespace views
+
+#endif  // VIEWS_FOCUS_FOCUS_UTIL_WIN_H_