plugins/svn4idea/src/org/jetbrains/idea/svn/dialogs/browserCache/KeepingSelectionExpander.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.jetbrains.idea.svn.dialogs.browserCache;
  17
  18 import org.jetbrains.idea.svn.dialogs.RepositoryBrowserComponent;
  19 import org.jetbrains.idea.svn.dialogs.RepositoryTreeNode;
  20
  21 import javax.swing.*;
  22 import javax.swing.tree.DefaultTreeModel;
  23 import javax.swing.tree.TreeNode;
  24 import javax.swing.tree.TreePath;
  25 import java.util.Enumeration;
  26
  27 public class KeepingSelectionExpander implements Expander {
  28   private final JTree myTree;
  29   private TreePath mySelectionPath;
  30
  31   public KeepingSelectionExpander(final RepositoryBrowserComponent browser) {
  32     myTree = browser.getRepositoryTree();
  33   }
  34
  35   public void onBeforeRefresh(final RepositoryTreeNode node) {
  36     mySelectionPath = myTree.getSelectionPath();
  37   }
  38
  39   public void onAfterRefresh(final RepositoryTreeNode node) {
  40     if (mySelectionPath == null) {
  41       return;
  42     }
  43
  44     setSelection(mySelectionPath.getPath(), 1, (TreeNode) myTree.getModel().getRoot());
  45   }
  46
  47   private boolean setSelection(final Object[] oldSelectionPath, final int idx, final TreeNode node) {
  48     if (idx >= oldSelectionPath.length) {
  49       return false;
  50     }
  51     if ((oldSelectionPath[idx] != null) && (oldSelectionPath[idx].toString() != null)) {
  52       final Enumeration children = node.children();
  53       while (children.hasMoreElements()) {
  54         final TreeNode child = (TreeNode) children.nextElement();
  55         if (oldSelectionPath[idx].toString().equals(child.toString())) {
  56           final boolean childStatus = setSelection(oldSelectionPath, idx + 1, child);
  57           if (! childStatus) {
  58             myTree.setSelectionPath(new TreePath(((DefaultTreeModel) myTree.getModel()).getPathToRoot(child)));
  59           }
  60           return true;
  61         }
  62       }
  63     }
  64     myTree.setSelectionPath(new TreePath(((DefaultTreeModel) myTree.getModel()).getPathToRoot(node)));
  65     return true;
  66   }
  67 }