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      1 // Copyright (c) 2012 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 #include "ui/views/mouse_watcher_view_host.h"
      6 
      7 #include "ui/gfx/screen.h"
      8 #include "ui/views/view.h"
      9 #include "ui/views/widget/widget.h"
     10 
     11 namespace views {
     12 
     13 MouseWatcherViewHost::MouseWatcherViewHost(View* view,
     14                                            const gfx::Insets& hot_zone_insets)
     15     : view_(view),
     16       hot_zone_insets_(hot_zone_insets) {
     17 }
     18 
     19 MouseWatcherViewHost::~MouseWatcherViewHost() {
     20 }
     21 
     22 bool MouseWatcherViewHost::Contains(
     23     const gfx::Point& screen_point,
     24     MouseEventType type) {
     25   bool in_view = IsCursorInViewZone(screen_point);
     26   if (!in_view || (type == MOUSE_EXIT && !IsMouseOverWindow()))
     27     return false;
     28   return true;
     29 }
     30 
     31 // Returns whether or not the cursor is currently in the view's "zone" which
     32 // is defined as a slightly larger region than the view.
     33 bool MouseWatcherViewHost::IsCursorInViewZone(const gfx::Point& screen_point) {
     34   gfx::Rect bounds = view_->GetLocalBounds();
     35   gfx::Point view_topleft(bounds.origin());
     36   View::ConvertPointToScreen(view_, &view_topleft);
     37   bounds.set_origin(view_topleft);
     38   bounds.SetRect(view_topleft.x() - hot_zone_insets_.left(),
     39                  view_topleft.y() - hot_zone_insets_.top(),
     40                  bounds.width() + hot_zone_insets_.width(),
     41                  bounds.height() + hot_zone_insets_.height());
     42 
     43   return bounds.Contains(screen_point.x(), screen_point.y());
     44 }
     45 
     46 // Returns true if the mouse is over the view's window.
     47 bool MouseWatcherViewHost::IsMouseOverWindow() {
     48   Widget* widget = view_->GetWidget();
     49   if (!widget)
     50     return false;
     51 
     52   return gfx::Screen::GetScreenFor(widget->GetNativeView())->
     53       GetWindowUnderCursor() == widget->GetNativeWindow();
     54 }
     55 
     56 }  // namespace views
     57