Create a unified UIElement interface for Widget, View and Window.

ash/devtools/widget_element.cc

+// Copyright 2017 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 "ash/devtools/widget_element.h"
+
+#include "ash/devtools/ui_element_delegate.h"
+
+namespace ash {
+namespace devtools {
+
+WidgetElement::WidgetElement(views::Widget* widget,
+                             UIElementDelegate* ui_element_delegate,
+                             UIElement* parent)
+    : UIElement(UIElementType::WIDGET, ui_element_delegate, parent),
+      widget_(widget) {
+  widget_->AddRemovalsObserver(this);
+}
+
+WidgetElement::~WidgetElement() {
+  widget_->RemoveRemovalsObserver(this);
+}
+
+void WidgetElement::OnWillRemoveView(views::Widget* widget, views::View* view) {
+  if (view == widget->GetRootView() &&
+      delegate()->OnUIElementRemoved(children()[0])) {

[sadrul, 2017/05/09 04:58:07]

It'd be good to verify the assumption on children() here. For example:
  if (view != widget->GetRootView())
    return;
  DCHECK_EQ(1u, children().size());
  UIElement* child = children()[0];
  delegate()->OnUIElementRemoved(child);
  RemoveChild(child);
  child->Destroy();

[thanhph, 2017/05/09 20:52:47]

Done.

+    RemoveChild(children()[0]);
+    children()[0]->Destroy();
+  }
+}
+
+void WidgetElement::OnWidgetBoundsChanged(views::Widget* widget,
+                                          const gfx::Rect& new_bounds) {
+  DCHECK(widget == widget_);

[sadrul, 2017/05/09 04:58:07]

DCHECK_EQ

[thanhph, 2017/05/09 20:52:47]

Done.

+  delegate()->OnUIElementBoundsChanged(this);
+}
+
+void WidgetElement::Destroy() {
+  delete this;
+}
+
+void WidgetElement::GetBounds(gfx::Rect* bounds) const {
+  *bounds = widget_->GetRestoredBounds();
+}
+
+void WidgetElement::SetBounds(const gfx::Rect& bounds) {
+  widget_->SetBounds(bounds);
+}
+
+void WidgetElement::GetVisible(bool* visible) const {
+  *visible = widget_->IsVisible();
+}
+
+void WidgetElement::SetVisible(bool visible) {
+  if (visible != widget_->IsVisible()) {

[sadrul, 2017/05/09 04:58:07]

early return. i.e.:

  if (visible == widget_->IsVisible())
    return;
  if (visible)
   ...

[thanhph, 2017/05/09 20:52:47]

Done.

+    if (visible)
+      widget_->Show();
+    else
+      widget_->Hide();
+  }
+}
+
+std::pair<aura::Window*, gfx::Rect> WidgetElement::GetNodeWindowAndBounds()
+    const {
+  return std::make_pair(widget_->GetNativeWindow(),
+                        widget_->GetWindowBoundsInScreen());
+}
+
+// static
+views::Widget* WidgetElement::From(UIElement* element) {
+  DCHECK_EQ(UIElementType::WIDGET, element->type());
+  return static_cast<WidgetElement*>(element)->widget_;
+}
+
+}  // namespace devtools
+}  // namespace ash