text: // Copyright 2013 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 UI_ACCESSIBILITY_AX_NODE_H_
  #define UI_ACCESSIBILITY_AX_NODE_H_
  
  #include "ui/accessibility/ax_node_data.h"
  
  namespace ui {
  
  // One node in an AXTree.
  class AX_EXPORT AXNode {
   public:
    // The constructor requires a parent, id, and index in parent, but
    // the data is not required. After initialization, only index_in_parent
    // is allowed to change, the others are guaranteed to never change.
    AXNode(AXNode* parent, int32 id, int32 index_in_parent);
    virtual ~AXNode();
  
    // Accessors.
    int32 id() const { return data_.id; }
    AXNode* parent() const { return parent_; }
    int child_count() const { return static_cast<int>(children_.size()); }
    const AXNodeData& data() const { return data_; }
    const std::vector<AXNode*>& children() const { return children_; }
  
    // Get the child at the given index.
    AXNode* ChildAtIndex(int index) const { return children_[index]; }
  
    // Set the node's accessibility data. This may be done during initial
    // initialization or later when the node data changes.
    virtual void SetData(const AXNodeData& src);
  
    // Set the index in parent, for example if siblings were inserted or deleted.
    void SetIndexInParent(int index_in_parent);
  
    // Swap the internal children vector with |children|. This instance
    // now owns all of the passed children.
    virtual void SwapChildren(std::vector<AXNode*>& children);
  
    // This is called when the AXTree no longer includes this node in the
    // tree. Reference counting is used on some platforms because the
    // operating system may hold onto a reference to an AXNode
    // object even after we're through with it, so this may decrement the
    // reference count and clear out the object's data.
    virtual void Destroy();
  
   private:
    int index_in_parent_;
    AXNode* parent_;
    std::vector<AXNode*> children_;
    AXNodeData data_;
  };
  
  
  }  // namespace ui
  
  #endif  // UI_ACCESSIBILITY_AX_NODE_H_
  