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

ash/devtools/ui_element.h

Index: ash/devtools/ui_element.h
diff --git a/ash/devtools/ui_element.h b/ash/devtools/ui_element.h
new file mode 100644
index 0000000000000000000000000000000000000000..a049a31525c439e94a9448cc88d1d304d8bc2510
--- /dev/null
+++ b/ash/devtools/ui_element.h
@@ -0,0 +1,75 @@
+// 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_DEVTOOLS_UI_ELEMENT_H_
+#define ASH_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() const;

[sadrul, 2017/05/05 20:19:34]

Since these are simple accessors, these should use unix_style_names() (and
inlined). For example:

  int node_id() const { return node_id_; }
  UIElementDelegate* delegate() { return delegate_; }
  UIElementType type() const { return type_; }

  std::string GetTypeName() const;

  UIElement* parent() { return parent_; }
  const std::vector<UIElement*>& children() const { return children_; }

[thanhph, 2017/05/08 17:03:30]

Done, thanks!

+  UIElementDelegate* delegate() const;
+  UIElementType GetType() const;
+  std::string GetTypeString() const;
+
+  const std::vector<UIElement*>& GetChildren() const;
+  void AddChild(UIElement* child, UIElement* before = nullptr);

[sadrul, 2017/05/05 20:19:33]

Document that |child| is inserted in front of |before|. If |before| is null, it
is inserted at the end.

[thanhph, 2017/05/08 17:03:30]

Done.

+  void RemoveChild(UIElement* child);
+  // Move child to position new_index in |children_|. Return previous sibling of
+  // the child after reordered if sibling exists or return nullptr otherwise.
+  UIElement* ReorderChild(UIElement* child, int new_index);
+
+  virtual void Destroy() = 0;
+  virtual void GetBounds(gfx::Rect* bounds) const = 0;
+  virtual void SetBounds(const gfx::Rect& bounds) = 0;
+  virtual void GetVisible(bool* visible) const = 0;
+  virtual void SetVisible(bool visible) = 0;
+  // If element exists, return its associated native window and its bounds.
+  // Otherwise, return null and empty bounds.
+  virtual std::pair<aura::Window*, gfx::Rect> GetNodeWindowAndBounds()
+      const = 0;
+
+  template <typename BackingT, typename T>
+  static BackingT* GetBackingElement(UIElement* element) {
+    return T::From(element);
+  };
+
+ protected:
+  UIElement(const UIElementType type,
+            UIElementDelegate* ui_element_delegate,
+            UIElement* parent);
+  virtual ~UIElement();
+
+ private:
+  int node_id_;
+  std::vector<UIElement*> children_;
+  const UIElementType type_;
+  UIElement* parent_;
+  UIElementDelegate* ui_element_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(UIElement);
+};
+
+}  // namespace devtools
+}  // namespace ash
+
+#endif  // ASH_DEVTOOLS_UI_ELEMENT_H_