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 <algorithm>
+
+#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 {
+namespace {
+
+static int node_ids = 0;
+
+}  // namespace
+
+std::string UIElement::GetTypeName() const {
+  switch (type_) {
+    case UIElementType::WINDOW:
+      return "Window";
+    case UIElementType::WIDGET:
+      return "Widget";
+    case UIElementType::VIEW:
+      return "View";
+  }
+}
+
+void UIElement::AddChild(UIElement* child, UIElement* before) {
+  if (before) {
+    auto iter = std::find(children_.begin(), children_.end(), before);
+    DCHECK(iter != children_.end());
+    children_.insert(iter, child);
+  } else {
+    children_.push_back(child);
+  }
+  delegate_->OnUIElementAdded(this, child);
+}
+
+void UIElement::RemoveChild(UIElement* child) {
+  delegate()->OnUIElementRemoved(child);
+  auto iter = std::find(children_.begin(), children_.end(), child);
+  if (iter != children_.end())

[sadrul, 2017/05/17 21:54:13]

Can this be a DCHECK()? i.e. DCHECK(iter != children_.end())

[thanhph, 2017/05/18 14:28:15]

Done. Also changed to use DCHECK in ReOrder.

+    children_.erase(iter);
+}
+
+void UIElement::ReorderChild(UIElement* child, int new_index) {
+  // Remove |child| out of vector |children_|.
+  auto iter = std::find(children_.begin(), children_.end(), child);
+  if (iter != children_.end())
+    children_.erase(iter);
+
+  // Move child to new position |new_index| in vector |children_|.
+  new_index = std::min(children_.size() - 1, static_cast<size_t>(new_index));
+  iter = children_.begin() + new_index;
+  children_.insert(iter, child);
+  delegate()->OnUIElementReordered(child->parent(), child);
+}
+
+UIElement::UIElement(const UIElementType type,
+                     UIElementDelegate* delegate,
+                     UIElement* parent)
+    : node_id_(++node_ids), type_(type), parent_(parent), delegate_(delegate) {
+  delegate_->OnUIElementAdded(0, this);
+}
+
+UIElement::~UIElement() {
+  for (auto* child : children_)
+    delete child;
+  children_.clear();
+}
+
+}  // namespace devtools
+}  // namespace ash