First step to move common accessibility code out of content.
This changelist defines new classes and types for
accessibility in ui/accessibility. Subsequent changes will
refactor code inside content/ to inherit from AXTree and
AXNode, then we can start exposing the accessibility tree
outside of content/.
In addition, we can now use these same types in Views
accessibility and share more code.
BUG=316726
Review URL: https://codereview.chromium.org/67283004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236733 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/accessibility/ax_tree_source.h b/ui/accessibility/ax_tree_source.h
new file mode 100644
index 0000000..383e70e
--- /dev/null
+++ b/ui/accessibility/ax_tree_source.h
@@ -0,0 +1,43 @@
+// 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_TREE_SOURCE_H_
+#define UI_ACCESSIBILITY_AX_TREE_SOURCE_H_
+
+#include "ui/accessibility/ax_node_data.h"
+
+namespace ui {
+
+// An AXTreeSource is an abstract interface for a serializable
+// accessibility tree. The tree may be in some other format or
+// may be computed dynamically, but maintains the properties that
+// it's a strict tree, it has a unique id for each node, and all
+// of the accessibility information about a node can be serialized
+// as an AXNodeData. This is the primary interface to use when
+// an accessibility tree will be sent over an IPC before being
+// consumed.
+template<class AXNodeSource>
+class AX_EXPORT AXTreeSource {
+ public:
+ virtual ~AXTreeSource() {}
+ virtual AXNodeSource* GetFromId(int32 id) const = 0;
+ virtual int32 GetId(const AXNodeSource* node) const = 0;
+ virtual int GetChildCount(const AXNodeSource* node) const = 0;
+ virtual AXNodeSource* GetChildAtIndex(const AXNodeSource* node, int index)
+ const = 0;
+
+ // Returns the id of this node's parent, or 0 if it doesn't have a parent.
+ virtual int32 GetParentId(const AXNodeSource* node) const = 0;
+
+ // Serialize one node in the tree.
+ virtual void SerializeNode(
+ const AXNodeSource* node, AXNodeData* out_data) const = 0;
+
+ protected:
+ AXTreeSource() {}
+};
+
+} // namespace ui
+
+#endif // UI_ACCESSIBILITY_AX_TREE_SOURCE_H_
