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

ash/devtools/ui_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/ui_element.h"
+#include "ash/devtools/ui_element_delegate.h"
+#include "ash/devtools/view_element.h"
+#include "ash/devtools/widget_element.h"
+#include "ash/devtools/window_element.h"
+
+namespace ash {
+namespace devtools {
+
+UIElement::UIElement() {}

[sadrul, 2017/04/19 18:21:39]

When a new UIElement is created, can this generate and set the globally unique
ID? Instead of the caller setting the id using SetNodeId()?

[thanhph, 2017/04/24 15:56:50]

No it can't at the moment but this can be addressed in this bug:
https://bugs.chromium.org/p/chromium/issues/detail?id=713389

+
+UIElement::~UIElement() {}

[sadrul, 2017/04/19 18:21:39]

Should this destroy all its children too during destruction?

[thanhph, 2017/04/24 15:56:50]

I'm able to move RemoveChild() to UIElement.cc but dom_agent will still call
RemoveChild() so that it can receive the return iterator from
std::vector<UIElement*>::iterator OnUIElementRemoved(). 

Calling RemoveChild() directly from ~UIElement() will crash at the moment since
the element is already clean up in RemoveChild() and won't be able to return
iterator from destructor.

[thanhph, 2017/04/24 16:51:28]

Im able to get the destructor to work now. Please review my new patch. Thanks!

+
+int UIElement::GetNodeId() const {
+  return node_id_;
+}
+
+void UIElement::SetNodeId(int node_id) {
+  this->node_id_ = node_id;
+}
+
+UIElement* UIElement::GetParent() {
+  return parent_;
+}
+
+void UIElement::SetParent(UIElement* parent) {
+  parent_ = parent;
+}
+
+UIElementDelegate* UIElement::GetUIElementDelegate() {
+  return ui_element_delegate_;
+}
+
+void UIElement::SetUIElementDelegate(UIElementDelegate* ui_element_delegate) {
+  this->ui_element_delegate_ = ui_element_delegate;
+}
+
+UIElementType UIElement::GetType() const {
+  return type_;
+}
+
+void UIElement::SetType(UIElementType type) {
+  type_ = type;
+}
+
+std::vector<UIElement*>& UIElement::GetChildren() {
+  return children_;
+}
+
+void UIElement::SetChildren(std::vector<UIElement*>& children) {
+  children_ = children;
+}
+
+}  // namespace devtools
+}  // namespace ash