1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 package org.openoffice.accessibility.awb.tree; 25 26 import com.sun.star.uno.UnoRuntime; 27 import com.sun.star.accessibility.XAccessible; 28 import com.sun.star.accessibility.XAccessibleContext; 29 30 /* 31 * This class is dynamic in the way that it does not contain any children 32 * until the node is going to be expanded. It also releases all children 33 * as soon as the node is collapsed again. 34 */ 35 class DynamicAccessibilityNode extends AccessibilityNode { 36 DynamicAccessibilityNode(AccessibilityModel treeModel)37 public DynamicAccessibilityNode(AccessibilityModel treeModel) { 38 super(treeModel); 39 } 40 41 // Populates the child list. Called by AccessibilityMode.treeWillExpand(). populate()42 protected void populate() { 43 try { 44 XAccessibleContext xAC = getAccessibleContext(); 45 if (xAC != null) { 46 int n = xAC.getAccessibleChildCount(); 47 for (int i=0; i<n; i++) { 48 XAccessible xAccessible = xAC.getAccessibleChild(i); 49 AccessibilityNode node = treeModel.findNode(xAccessible); 50 if (node == null) { 51 node = treeModel.createNode(xAccessible); 52 } 53 if (node != null) { 54 // NOTE: do not send any tree notifications here ! 55 add(node); 56 } 57 } 58 } 59 } catch (com.sun.star.lang.IndexOutOfBoundsException e) { 60 // This should never happen since we previously checked the child 61 // count. 62 // FIXME: error message 63 } catch (com.sun.star.uno.RuntimeException e) { 64 // FIXME: error message 65 } 66 } 67 68 // Clears the child list. Called by AccessibilityModel.treeCollapsed(). clear()69 protected void clear() { 70 removeAllChildren(); 71 } 72 73 /* This is called whenever the node is painted, no matter if collapsed 74 * or expanded. Making this a "life" value seems to be appropriate. 75 */ isLeaf()76 public boolean isLeaf() { 77 try { 78 XAccessibleContext xAC = getAccessibleContext(); 79 if (xAC != null) { 80 return xAC.getAccessibleChildCount() == 0; 81 } 82 return true; 83 } catch (com.sun.star.uno.RuntimeException e) { 84 return true; 85 } 86 } 87 88 } 89