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) {
+  if (!widget_->HasRemovalsObserver(this))

[sadrul, 2017/05/01 16:22:27]

There's no reason for having this check.

[thanhph, 2017/05/03 21:58:11]

Done.

+    widget_->AddRemovalsObserver(this);
+}
+
+WidgetElement::~WidgetElement() {
+  if (widget_ && widget_->HasRemovalsObserver(this))

[sadrul, 2017/05/01 16:22:27]

You are never resetting |widget_|. So this check should not be needed.

[thanhph, 2017/05/03 21:58:11]

Done.

+    widget_->RemoveRemovalsObserver(this);
+}
+
+views::Widget* WidgetElement::widget() {
+  return widget_;
+}
+
+void WidgetElement::OnWillRemoveView(views::Widget* widget, views::View* view) {
+  if (view == widget->GetRootView()) {
+    if (GetUIElementDelegate()->OnUIElementRemoved(
+            GetChildren()[0]->GetNodeId())) {
+      GetChildren()[0]->RemoveChildFromParent();
+      GetChildren()[0]->Destroy();

[sadrul, 2017/05/01 16:22:27]

Can you explain this? e.g. why use GetChildren()[0] here?

[thanhph, 2017/05/03 21:58:11]

Widget has only 1 child which is the root view, a.k.a, GetChildren()[0].

+    }
+  }
+}
+
+void WidgetElement::OnWidgetBoundsChanged(views::Widget* widget,
+                                          const gfx::Rect& new_bounds) {
+  if (widget == widget_)

[sadrul, 2017/05/01 16:22:27]

This should be a DCHECK()?

[thanhph, 2017/05/03 21:58:10]

Done.

+    GetUIElementDelegate()->OnUIElementBoundsChanged(GetNodeId());
+}
+
+void WidgetElement::Destroy() {
+  delete this;
+}
+
+bool WidgetElement::GetBounds(gfx::Rect* bounds) {
+  if (widget_) {

[sadrul, 2017/05/01 16:22:27]

Why do you need these null-checks?

[thanhph, 2017/05/03 21:58:11]

I removed them.

+    *bounds = widget_->GetRestoredBounds();
+    return true;
+  }
+  return false;
+}
+
+bool WidgetElement::SetBounds(const gfx::Rect& bounds) {
+  if (widget_) {
+    widget_->SetBounds(bounds);
+    return true;
+  }
+  return false;
+}
+
+bool WidgetElement::GetVisible(bool* visible) {
+  if (widget_) {
+    *visible = widget_->IsVisible();
+    return true;
+  }
+  return false;
+}
+
+bool WidgetElement::SetVisible(bool visible) {
+  if (widget_) {
+    if (visible != widget_->IsVisible()) {
+      if (visible)
+        widget_->Show();
+      else
+        widget_->Hide();
+    }
+    return true;
+  }
+  return false;
+}
+
+std::pair<aura::Window*, gfx::Rect> WidgetElement::GetNodeWindowAndBounds() {
+  if (widget_)
+    return std::make_pair(widget_->GetNativeWindow(),
+                          widget_->GetWindowBoundsInScreen());
+  return std::make_pair(nullptr, gfx::Rect());
+}
+
+// static
+views::Widget* WidgetElement::From(UIElement* element) {
+  DCHECK_EQ(UIElementType::WIDGET, element->GetType());
+  return static_cast<WidgetElement*>(element)->widget_;
+}
+
+}  // namespace devtools
+}  // namespace ash