1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_ACCESSIBILITY_AX_TREE_SOURCE_H_ 6 #define UI_ACCESSIBILITY_AX_TREE_SOURCE_H_ 7 8 #include "ui/accessibility/ax_node_data.h" 9 10 namespace ui { 11 12 // An AXTreeSource is an abstract interface for a serializable 13 // accessibility tree. The tree may be in some other format or 14 // may be computed dynamically, but maintains the properties that 15 // it's a strict tree, it has a unique id for each node, and all 16 // of the accessibility information about a node can be serialized 17 // as an AXNodeData. This is the primary interface to use when 18 // an accessibility tree will be sent over an IPC before being 19 // consumed. 20 template<class AXNodeSource> 21 class AX_EXPORT AXTreeSource { 22 public: 23 virtual ~AXTreeSource() {} 24 virtual AXNodeSource* GetRoot() const = 0; 25 virtual AXNodeSource* GetFromId(int32 id) const = 0; 26 virtual int32 GetId(const AXNodeSource* node) const = 0; 27 virtual int GetChildCount(const AXNodeSource* node) const = 0; 28 virtual AXNodeSource* GetChildAtIndex(const AXNodeSource* node, int index) 29 const = 0; 30 virtual AXNodeSource* GetParent(const AXNodeSource* node) const = 0; 31 32 // Serialize one node in the tree. 33 virtual void SerializeNode( 34 const AXNodeSource* node, AXNodeData* out_data) const = 0; 35 36 protected: 37 AXTreeSource() {} 38 }; 39 40 } // namespace ui 41 42 #endif // UI_ACCESSIBILITY_AX_TREE_SOURCE_H_ 43
