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+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+import com.sun.star.accessibility.XAccessible;
+import com.sun.star.accessibility.XAccessibleContext;
+import com.sun.star.lang.IndexOutOfBoundsException;
+
+
+/**
+ * Map the tree of accessibility objects into their
+ * AccessibilityTreeModel counterparts.
+ */
+class AccessibleTreeHandler
+ extends NodeHandler
+{
+ private XAccessibleContext mxContext;
+
+ @Override
+ public NodeHandler createHandler (XAccessibleContext xContext)
+ {
+ if (xContext != null)
+ return new AccessibleTreeHandler (xContext);
+ else
+ return null;
+ }
+
+ public AccessibleTreeHandler ()
+ {
+ super();
+ mxContext = null;
+ }
+
+ private AccessibleTreeHandler (XAccessibleContext xContext)
+ {
+ super();
+ mxContext = xContext;
+ if (mxContext != null)
+ // Add one to the number of children to include the string node
+ // that tells you how many children there are.
+ synchronized (maChildList)
+ {
+ maChildList.setSize (1 + mxContext.getAccessibleChildCount());
+ }
+ }
+
+ @Override
+ public AccessibleTreeNode createChild (AccessibleTreeNode aParent, int nIndex)
+ {
+ AccessibleTreeNode aChild = null;
+ if (mxContext != null)
+ {
+ if (nIndex == 0)
+ aChild = new StringNode ("Child count: " + mxContext.getAccessibleChildCount(),
+ aParent);
+ else
+ {
+ // Lower index to skip the string node.
+ nIndex -= 1;
+ try
+ {
+ XAccessible xChild = mxContext.getAccessibleChild (nIndex);
+ aChild = NodeFactory.Instance().createDefaultNode (
+ xChild, aParent);
+ }
+ catch( IndexOutOfBoundsException e )
+ {
+ aChild = new StringNode ("ERROR: no child with index " + nIndex, aParent);
+ }
+ }
+ }
+ else
+ aChild = new StringNode ("XAccessibleContext interface not supported", aParent);
+ return aChild;
+ }
+
+ /** Try to add the specified accessible child into the lists of
+ children. The insertion position is determined from the
+ getIndexInParent method of the child.
+ */
+ public AccessibleTreeNode addAccessibleChild (AccessibleTreeNode aParent, XAccessible xChild)
+ {
+ AccessibleTreeNode aChild = null;
+
+ if (xChild != null)
+ {
+ XAccessibleContext xContext = xChild.getAccessibleContext();
+ if (xContext != null)
+ {
+ int nIndex = xContext.getAccessibleIndexInParent() + 1;
+ synchronized (maChildList)
+ {
+ if ((nIndex >= 0) || (nIndex <= maChildList.size()))
+ {
+ aChild = NodeFactory.Instance().createDefaultNode (xChild, aParent);
+ maChildList.add (nIndex, aChild);
+ }
+ }
+ }
+ }
+ return aChild;
+ }
+
+
+ /** Update only the child count node. Trust on other ways to update the
+ accessible children.
+ */
+ @Override
+ public void update (AccessibleTreeNode aNode)
+ {
+ synchronized (maChildList)
+ {
+ maChildList.set (0, null);
+ }
+ }
+}