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

ash/devtools/window_element.h

+// 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.
+
+#ifndef ASH_COMMON_DEVTOOLS_WINDOW_ELEMENT_H_
+#define ASH_COMMON_DEVTOOLS_WINDOW_ELEMENT_H_
+
+#include "ash/ash_export.h"
+#include "ash/devtools/ui_element.h"
+#include "base/macros.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_observer.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace ash {
+namespace devtools {
+
+class ASH_EXPORT WindowElement : public aura::WindowObserver, public UIElement {
+ public:
+  WindowElement(aura::Window* window,
+                UIElementDelegate* ui_element_delegate,
+                UIElement* parent);
+  ~WindowElement() override;
+  aura::Window* window();
+
+  // WindowObserver:
+  void OnWindowHierarchyChanging(
+      const aura::WindowObserver::HierarchyChangeParams& params) override;
+  void OnWindowHierarchyChanged(
+      const aura::WindowObserver::HierarchyChangeParams& params) override;
+  void OnWindowStackingChanged(aura::Window* window) override;
+  void OnWindowBoundsChanged(aura::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
+
+  // UIElement:
+  void Destroy() override;
+  bool GetBounds(gfx::Rect* bounds) override;
+  bool SetBounds(const gfx::Rect& bounds) override;
+  bool GetVisible(bool* visible) override;
+  bool SetVisible(bool visible) override;
+  std::pair<aura::Window*, gfx::Rect> GetNodeWindowAndBounds() override;
+
+  static aura::Window* From(UIElement* element);
+
+ private:
+  aura::Window* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowElement);
+};
+
+}  // namespace devtools
+}  // namespace ash
+
+#endif  // ASH_COMMON_DEVTOOLS_WINDOW_ELEMENT_H_