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

ash/devtools/ui_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_UI_ELEMENT_H_
+#define ASH_COMMON_DEVTOOLS_UI_ELEMENT_H_
+
+#include <vector>
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+#include "ui/aura/window.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/views/view.h"
+
+namespace ash {
+
+namespace devtools {
+
+class UIElementDelegate;
+
+// UIElement type.
+enum UIElementType { WINDOW, WIDGET, VIEW };
+
+class ASH_EXPORT UIElement {
+ public:
+  int GetNodeId() const;
+  void SetNodeId(int node_id);
+
+  UIElement* GetParent();
+  void SetParent(UIElement* parent);
+
+  UIElementDelegate* GetUIElementDelegate();

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

UIElementDelegate* delegate() { return ui_element_delegate_; }

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

Done.

+  void SetUIElementDelegate(UIElementDelegate* ui_element_delegate);

[sadrul, 2017/05/01 16:22:26]

This should no longer be needed?

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

Done.

+
+  UIElementType GetType() const;
+  void SetType(UIElementType type);

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

This should no longer be needed.

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

Done.

+
+  std::vector<UIElement*>& GetChildren();

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

this should return a const-ref. (i.e. the callers should not be able to mutate
the returned list of children)

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

Done.

+  void SetChildren(std::vector<UIElement*>& children);

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

SetChildren() seems a bit odd ... Can this be AddChild + RemoveChild instead?

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

Done.

+
+  // Remove ui_element from parent's children and return its next sibling.
+  std::vector<UIElement*>::iterator RemoveChildFromParent();
+
+  virtual void Destroy() = 0;
+  virtual bool GetBounds(gfx::Rect* bounds) = 0;
+  virtual bool SetBounds(const gfx::Rect& bounds) = 0;
+  virtual bool GetVisible(bool* visible) = 0;
+  virtual bool SetVisible(bool visible) = 0;
+  virtual std::pair<aura::Window*, gfx::Rect> GetNodeWindowAndBounds() = 0;

[sadrul, 2017/05/01 16:22:26]

Document what the return value should be (e.g. what should be the coordinate
space of gfx::Rect?)

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

Done.

+
+  template <typename BackingT, typename T>
+  static BackingT* GetBackingElement(UIElement* element) {
+    return T::From(element);
+  };
+
+ protected:
+  UIElement(UIElementType type,
+            UIElementDelegate* ui_element_delegate,
+            UIElement* parent);
+  virtual ~UIElement();
+
+ private:
+  int node_id_;
+  std::vector<UIElement*> children_;
+  UIElementType type_;

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

Make this a const, so that it never changes after creation.

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

Done.

+  UIElement* parent_;
+  UIElementDelegate* ui_element_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(UIElement);
+};
+
+}  // namespace devtools
+}  // namespace ash
+
+#endif  // ASH_COMMON_DEVTOOLS_UI_ELEMENT_H_