Move the mouse wheel utils from views to ui\base\win, to get rid of some views dependencies in co...

views/focus/focus_util_win.cc

Index: views/focus/focus_util_win.cc
===================================================================
--- views/focus/focus_util_win.cc	(revision 98345)
+++ views/focus/focus_util_win.cc	(working copy)
@@ -1,121 +0,0 @@
-// 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.
-
-#include "views/focus/focus_util_win.h"
-
-#include <windowsx.h>
-
-#include "base/auto_reset.h"
-#include "ui/base/view_prop.h"
-#include "ui/base/win/hwnd_util.h"
-
-using ui::ViewProp;
-
-namespace views {
-
-// Property used to indicate the HWND supports having mouse wheel messages
-// rerouted to it.
-static const char* const kHWNDSupportMouseWheelRerouting =
-    "__HWND_MW_REROUTE_OK";
-
-static bool WindowSupportsRerouteMouseWheel(HWND window) {
-  while (GetWindowLong(window, GWL_STYLE) & WS_CHILD) {
-    if (!IsWindow(window))
-      break;
-
-    if (reinterpret_cast<bool>(
-            ViewProp::GetValue(window, kHWNDSupportMouseWheelRerouting))) {
-      return true;
-    }
-    window = GetParent(window);
-  }
-  return false;
-}
-
-static bool IsCompatibleWithMouseWheelRedirection(HWND window) {
-  std::wstring class_name = ui::GetClassName(window);
-  // Mousewheel redirection to comboboxes is a surprising and
-  // undesireable user behavior.
-  return !(class_name == L"ComboBox" ||
-           class_name == L"ComboBoxEx32");
-}
-
-static bool CanRedirectMouseWheelFrom(HWND window) {
-  std::wstring class_name = ui::GetClassName(window);
-
-  // Older Thinkpad mouse wheel drivers create a window under mouse wheel
-  // pointer. Detect if we are dealing with this window. In this case we
-  // don't need to do anything as the Thinkpad mouse driver will send
-  // mouse wheel messages to the right window.
-  if ((class_name == L"Syn Visual Class") ||
-     (class_name == L"SynTrackCursorWindowClass"))
-    return false;
-
-  return true;
-}
-
-ViewProp* SetWindowSupportsRerouteMouseWheel(HWND hwnd) {
-  return new ViewProp(hwnd, kHWNDSupportMouseWheelRerouting,
-                      reinterpret_cast<HANDLE>(true));
-}
-
-bool RerouteMouseWheel(HWND window, WPARAM w_param, LPARAM l_param) {
-  // Since this is called from a subclass for every window, we can get
-  // here recursively. This will happen if, for example, a control
-  // reflects wheel scroll messages to its parent. Bail out if we got
-  // here recursively.
-  static bool recursion_break = false;
-  if (recursion_break)
-    return false;
-  // Check if this window's class has a bad interaction with rerouting.
-  if (!IsCompatibleWithMouseWheelRedirection(window))
-    return false;
-
-  DWORD current_process = GetCurrentProcessId();
-  POINT wheel_location = { GET_X_LPARAM(l_param), GET_Y_LPARAM(l_param) };
-  HWND window_under_wheel = WindowFromPoint(wheel_location);
-
-  if (!CanRedirectMouseWheelFrom(window_under_wheel))
-    return false;
-
-  // Find the lowest Chrome window in the hierarchy that can be the
-  // target of mouse wheel redirection.
-  while (window != window_under_wheel) {
-    // If window_under_wheel is not a valid Chrome window, then return true to
-    // suppress further processing of the message.
-    if (!::IsWindow(window_under_wheel))
-      return true;
-    DWORD wheel_window_process = 0;
-    GetWindowThreadProcessId(window_under_wheel, &wheel_window_process);
-    if (current_process != wheel_window_process) {
-      if (IsChild(window, window_under_wheel)) {
-        // If this message is reflected from a child window in a different
-        // process (happens with out of process windowed plugins) then
-        // we don't want to reroute the wheel message.
-        return false;
-      } else {
-        // The wheel is scrolling over an unrelated window. Make sure that we
-        // have marked that window as supporting mouse wheel rerouting.
-        // Otherwise, we cannot send random WM_MOUSEWHEEL messages to arbitrary
-        // windows. So just drop the message.
-        if (!WindowSupportsRerouteMouseWheel(window_under_wheel))
-          return true;
-      }
-    }
-
-    // window_under_wheel is a Chrome window.  If allowed, redirect.
-    if (IsCompatibleWithMouseWheelRedirection(window_under_wheel)) {
-      AutoReset<bool> auto_reset_recursion_break(&recursion_break, true);
-      SendMessage(window_under_wheel, WM_MOUSEWHEEL, w_param, l_param);
-      return true;
-    }
-    // If redirection is disallowed, try the parent.
-    window_under_wheel = GetAncestor(window_under_wheel, GA_PARENT);
-  }
-  // If we traversed back to the starting point, we should process
-  // this message normally; return false.
-  return false;
-}
-
-}  // namespace views