Add support for MouseEnter/MouseExit event types to be sent to aura::Windows.

ui/aura/root_window.cc

 // 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/aura/root_window.h"
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "ui/aura/event.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/events.h"
 
 namespace aura {
 namespace internal {
 
 RootWindow::RootWindow()
     : Window(NULL),
       mouse_pressed_handler_(NULL),
+      mouse_moved_handler_(NULL),
       ALLOW_THIS_IN_INITIALIZER_LIST(focus_manager_(new FocusManager(this))),
       capture_window_(NULL) {
   set_name(ASCIIToUTF16("RootWindow"));
 }
 
 RootWindow::~RootWindow() {
 }
 
 bool RootWindow::HandleMouseEvent(const MouseEvent& event) {
   Window* target =
       mouse_pressed_handler_ ? mouse_pressed_handler_ : capture_window_;
   if (!target)
     target = GetEventHandlerForPoint(event.location());
   if (event.type() == ui::ET_MOUSE_PRESSED && !mouse_pressed_handler_)

[sky, 2011/09/21 20:30:54]

I think it's time for a switch.

     mouse_pressed_handler_ = target;
   if (event.type() == ui::ET_MOUSE_RELEASED)
     mouse_pressed_handler_ = NULL;
+  if (event.type() == ui::ET_MOUSE_MOVED)
+    HandleMouseMoved(event, target);
   if (target && target->delegate()) {
     MouseEvent translated_event(event, this, target);
     return target->OnMouseEvent(&translated_event);
   }
   return false;
 }
 
 bool RootWindow::HandleKeyEvent(const KeyEvent& event) {
   Window* focused_window = GetFocusManager()->focused_window();
   if (focused_window) {
@@ skipping 31 matching lines @@
   // Update the FocusManager if the window was focused.
   internal::FocusManager* focus_manager = GetFocusManager();
   if (focus_manager && focus_manager->focused_window() == window)
     focus_manager->SetFocusedWindow(NULL);
 
   // When a window is being destroyed it's likely that the WindowDelegate won't
   // want events, so we reset the mouse_pressed_handler_ and capture_window_ and
   // don't sent it release/capture lost events.
   if (mouse_pressed_handler_ == window)
     mouse_pressed_handler_ = NULL;
+  if (mouse_moved_handler_ == window)
+    mouse_moved_handler_ = NULL;
   if (capture_window_ == window)
     capture_window_ = NULL;
 }
 
 FocusManager* RootWindow::GetFocusManager() {
   return focus_manager_.get();
 }
 
 internal::RootWindow* RootWindow::GetRoot() {
   return this;
 }
 
+void RootWindow::HandleMouseMoved(const MouseEvent& event, Window* target) {
+  if (target == mouse_moved_handler_)
+    return;
+
+  // Send an exited event.
+  if (mouse_moved_handler_) {

[sky, 2011/09/21 20:30:54]

Do you need to make sure mouse_moved_handler_ has a delegate here and on 117
like we do around line 38?

+    MouseEvent translated_event(event, this, mouse_moved_handler_,
+                                ui::ET_MOUSE_EXITED);
+    mouse_moved_handler_->OnMouseEvent(&translated_event);
+  }
+  mouse_moved_handler_ = target;
+  // Send an entered event.
+  if (mouse_moved_handler_) {
+    MouseEvent translated_event(event, this, mouse_moved_handler_,
+                                ui::ET_MOUSE_ENTERED);
+    mouse_moved_handler_->OnMouseEvent(&translated_event);
+  }
+}
+
 }  // namespace internal
 }  // namespace aura