Refactored MouseWatcher to allow regions other than Views to

ui/views/mouse_watcher_view_host.cc

Index: ui/views/mouse_watcher_view_host.cc
diff --git a/ui/views/mouse_watcher_view_host.cc b/ui/views/mouse_watcher_view_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..35685d6b3c63c3f25cdf823aadb1552ea93434fb
--- /dev/null
+++ b/ui/views/mouse_watcher_view_host.cc
@@ -0,0 +1,56 @@
+// Copyright (c) 2011 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 "ui/views/mouse_watcher_view_host.h"
+
+#include "ui/gfx/screen.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+
+MouseWatcherViewHost::MouseWatcherViewHost(View* view,
+                                           const gfx::Insets& hot_zone_insets)
+    : view_(view),
+      hot_zone_insets_(hot_zone_insets) {
+}
+
+MouseWatcherViewHost::~MouseWatcherViewHost() {
+}
+
+bool MouseWatcherViewHost::Contains(
+    const gfx::Point& screen_point,
+    MouseEventType type) {
+  bool in_view = IsCursorInViewZone(screen_point);
+  if (!in_view || (type == MOUSE_EXIT && !IsMouseOverWindow()))
+    return false;
+  return true;
+}
+
+// Returns whether or not the cursor is currently in the view's "zone" which
+// is defined as a slightly larger region than the view.
+bool MouseWatcherViewHost::IsCursorInViewZone(const gfx::Point& screen_point) {
+  gfx::Rect bounds = view_->GetLocalBounds();
+  gfx::Point view_topleft(bounds.origin());
+  View::ConvertPointToScreen(view_, &view_topleft);
+  bounds.set_origin(view_topleft);
+  bounds.SetRect(view_topleft.x() - hot_zone_insets_.left(),
+                 view_topleft.y() - hot_zone_insets_.top(),
+                 bounds.width() + hot_zone_insets_.width(),
+                 bounds.height() + hot_zone_insets_.height());
+
+  return bounds.Contains(screen_point.x(), screen_point.y());
+}
+
+// Returns true if the mouse is over the view's window.
+bool MouseWatcherViewHost::IsMouseOverWindow() {
+  Widget* widget = view_->GetWidget();
+  if (!widget)
+    return false;
+
+  return gfx::Screen::GetWindowAtCursorScreenPoint() ==
+      widget->GetNativeWindow();
+}
+
+}  // namespace views