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

ash/devtools/window_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/window_element.h"
+
+#include "ash/devtools/ui_element_delegate.h"
+#include "ui/aura/window.h"
+
+namespace ash {
+namespace devtools {
+
+WindowElement::WindowElement(aura::Window* window,
+                             UIElementDelegate* ui_element_delegate,
+                             UIElement* parent)
+    : UIElement(UIElementType::WINDOW, ui_element_delegate, parent),
+      window_(window) {
+  if (window_ && !window_->HasObserver(this))
+    window_->AddObserver(this);
+}
+
+WindowElement::~WindowElement() {
+  if (window_ && window_->HasObserver(this))
+    window_->RemoveObserver(this);
+}
+
+aura::Window* WindowElement::window() {
+  return window_;
+}
+
+// Handles removing window_.
+void WindowElement::OnWindowHierarchyChanging(
+    const aura::WindowObserver::HierarchyChangeParams& params) {
+  if (params.target == window_ &&
+      GetUIElementDelegate()->OnUIElementRemoved(GetNodeId())) {
+    RemoveChildFromParent();
+    Destroy();
+  }
+}
+
+// Handles adding window_.
+void WindowElement::OnWindowHierarchyChanged(
+    const aura::WindowObserver::HierarchyChangeParams& params) {
+  if (window_ == params.new_parent && params.receiver == params.new_parent) {
+    GetUIElementDelegate()->OnUIElementAdded(
+        GetNodeId(),
+        new WindowElement(params.target, GetUIElementDelegate(), this),
+        GetChildren().end() - 1);
+  }
+}
+
+void WindowElement::OnWindowStackingChanged(aura::Window* window) {
+  if (window_ == window) {

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

This should be a DCHECK, right?

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

Done. Only the changed window is called back here.

+    std::vector<UIElement*>::iterator prev_sibling_position;
+
+    if (GetUIElementDelegate()->OnUIElementRemoved(GetNodeId()))
+      prev_sibling_position = RemoveChildFromParent();
+    else
+      prev_sibling_position = GetParent()->GetChildren().end();
+
+    GetUIElementDelegate()->OnUIElementAdded(
+        GetParent()->GetNodeId(),
+        new WindowElement(window, GetUIElementDelegate(), GetParent()),
+        prev_sibling_position);

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

Without doing Removed + Added, can we introduce
UIElementDelegate::OnUIElementReordered(UIElement* element, int new_index), or
something like that? I think that would simplify this.

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

Done.

+    Destroy();
+  }
+}
+
+void WindowElement::OnWindowBoundsChanged(aura::Window* window,
+                                          const gfx::Rect& old_bounds,
+                                          const gfx::Rect& new_bounds) {
+  if (window_ == window)

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

ditto

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

Done.

+    GetUIElementDelegate()->OnUIElementBoundsChanged(GetNodeId());
+}
+
+void WindowElement::Destroy() {
+  delete this;
+}
+
+bool WindowElement::GetBounds(gfx::Rect* bounds) {
+  if (window_) {
+    *bounds = window_->bounds();
+    return true;
+  }
+  return false;
+}
+
+bool WindowElement::SetBounds(const gfx::Rect& bounds) {
+  if (window_) {
+    window_->SetBounds(bounds);
+    return true;
+  }
+  return false;
+}
+
+bool WindowElement::GetVisible(bool* visible) {
+  if (window_) {
+    *visible = window_->IsVisible();
+    return true;
+  }
+  return false;
+}
+
+bool WindowElement::SetVisible(bool visible) {
+  if (window_) {
+    if (visible != window_->IsVisible()) {
+      if (visible)
+        window_->Show();
+      else
+        window_->Hide();
+    }
+    return true;
+  }
+  return false;
+}
+
+std::pair<aura::Window*, gfx::Rect> WindowElement::GetNodeWindowAndBounds() {
+  if (window_)
+    return std::make_pair(window_, window_->GetBoundsInScreen());
+  return std::make_pair(nullptr, gfx::Rect());
+}
+
+// static
+aura::Window* WindowElement::From(UIElement* element) {
+  DCHECK_EQ(UIElementType::WINDOW, element->GetType());
+  return static_cast<WindowElement*>(element)->window_;
+}
+
+}  // namespace devtools
+}  // namespace ash