Reland: Implement features in NativeViewHostAura for scroll end effect

ui/views/controls/native/native_view_host.cc

 // Copyright (c) 2012 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/controls/native/native_view_host.h"
 
 #include "base/logging.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/accessibility/native_view_accessibility.h"
 #include "ui/views/controls/native/native_view_host_wrapper.h"
@@ skipping 15 matching lines @@
 const bool NativeViewHost::kRenderNativeControlFocus = true;
 #endif
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeViewHost, public:
 
 NativeViewHost::NativeViewHost()
     : native_view_(NULL),
       fast_resize_(false),
       fast_resize_at_last_layout_(false),
+      fast_resize_gravity_(GRAVITY_NORTHWEST),
       focus_view_(NULL) {
 }
 
 NativeViewHost::~NativeViewHost() {
 }
 
 void NativeViewHost::Attach(gfx::NativeView native_view) {
   DCHECK(native_view);
   DCHECK(!native_view_);
   native_view_ = native_view;
   // If set_focus_view() has not been invoked, this view is the one that should
   // be seen as focused when the native view receives focus.
   if (!focus_view_)
     focus_view_ = this;
-  native_wrapper_->NativeViewWillAttach();
-  Widget::ReparentNativeView(native_view_, GetWidget()->GetNativeView());
+  native_wrapper_->AttachNativeView();
   Layout();
-
-  Widget* widget = Widget::GetWidgetForNativeView(native_view);
+  Widget* widget = Widget::GetWidgetForNativeView(native_view_);
   if (widget)
     widget->SetNativeWindowProperty(kWidgetNativeViewHostKey, this);
 }
 
 void NativeViewHost::Detach() {
   Detach(false);
 }
 
 void NativeViewHost::SetPreferredSize(const gfx::Size& size) {
   preferred_size_ = size;
   PreferredSizeChanged();
 }
 
+float NativeViewHost::GetWidthScaleFactor() const {
+  switch (fast_resize_gravity_) {
+    case GRAVITY_NORTHWEST:
+      return 0.0;
+    case GRAVITY_NORTH:
+      return 0.5;
+    case GRAVITY_NORTHEAST:
+      return 1.0;
+    case GRAVITY_EAST:
+      return 1.0;
+    case GRAVITY_SOUTHEAST:
+      return 1.0;
+    case GRAVITY_SOUTH:
+      return 0.5;
+    case GRAVITY_SOUTHWEST:
+      return 0.0;
+    case GRAVITY_WEST:
+      return 0.0;
+    case GRAVITY_CENTER:
+      return 0.5;
+  }
+  NOTREACHED();
+  return 0.0;
+}
+
+float NativeViewHost::GetHeightScaleFactor() const {
+  switch (fast_resize_gravity_) {
+    case GRAVITY_NORTHWEST:
+      return 0.0;
+    case GRAVITY_NORTH:
+      return 0.0;
+    case GRAVITY_NORTHEAST:
+      return 0.0;
+    case GRAVITY_EAST:
+      return 0.5;
+    case GRAVITY_SOUTHEAST:
+      return 1.0;
+    case GRAVITY_SOUTH:
+      return 1.0;
+    case GRAVITY_SOUTHWEST:
+      return 1.0;
+    case GRAVITY_WEST:
+      return 0.5;
+    case GRAVITY_CENTER:
+      return 0.5;
+  }
+  NOTREACHED();
+  return 0.0;
+}
+
 void NativeViewHost::NativeViewDestroyed() {
   // Detach so we can clear our state and notify the native_wrapper_ to release
   // ref on the native view.
   Detach(true);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeViewHost, View overrides:
 
 gfx::Size NativeViewHost::GetPreferredSize() {
@@ skipping 143 matching lines @@
   Widget::GetAllChildWidgets(native_view(), &widgets);
   for (Widget::Widgets::iterator i = widgets.begin(); i != widgets.end(); ++i) {
     focus_manager->ViewRemoved((*i)->GetRootView());
     if (!focus_manager->GetFocusedView())
       return;
   }
 }
 
 
 }  // namespace views