text: // 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 COMPONENTS_UI_DEVTOOLS_UI_ELEMENT_DELEGATE_H_
  #define COMPONENTS_UI_DEVTOOLS_UI_ELEMENT_DELEGATE_H_
  
  namespace ui_devtools {
  
  class UIElement;
  
  class UIElementDelegate {
   public:
    UIElementDelegate() {}
  
    UIElementDelegate(const UIElementDelegate&) = delete;
    UIElementDelegate& operator=(const UIElementDelegate&) = delete;
  
    virtual ~UIElementDelegate() {}
  
    virtual void OnUIElementAdded(UIElement* parent, UIElement* child) = 0;
  
    // Move |child| to different sibling index under |parent| in DOM tree.
    virtual void OnUIElementReordered(UIElement* parent, UIElement* child) = 0;
  
    // Remove ui_element in DOM tree.
    virtual void OnUIElementRemoved(UIElement* ui_element) = 0;
  
    // Update CSS agent when bounds change.
    virtual void OnUIElementBoundsChanged(UIElement* ui_element) = 0;
  };
  
  }  // namespace ui_devtools
  
  #endif  // COMPONENTS_UI_DEVTOOLS_UI_ELEMENT_DELEGATE_H_
  