1 | package nu.fw.jeti.util; |
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2 | |
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3 | import java.util.Hashtable; |
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4 | |
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5 | import javax.swing.JTree; |
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6 | import javax.swing.SwingUtilities; |
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7 | import javax.swing.event.TreeExpansionEvent; |
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8 | import javax.swing.event.TreeExpansionListener; |
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9 | import javax.swing.event.TreeModelEvent; |
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10 | import javax.swing.event.TreeModelListener; |
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11 | import javax.swing.tree.TreeModel; |
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12 | import javax.swing.tree.TreePath; |
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13 | |
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14 | /** |
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15 | * Used to filter some nodes from a tree. That is nodes which the |
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16 | * selector decides not to show does not seem to exist in the tree. |
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17 | * The selector is assumed to not change behavior over time. |
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18 | * |
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19 | * @author Martin Forssen |
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20 | */ |
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21 | |
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22 | public class TreeExpander implements TreeExpansionListener, TreeModelListener { |
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23 | private JTree tree; |
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24 | private Hashtable known = new Hashtable(); |
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25 | |
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26 | public TreeExpander(JTree tree, TreeModel model) { |
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27 | this.tree = tree; |
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28 | |
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29 | tree.addTreeExpansionListener(this); |
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30 | model.addTreeModelListener(this); |
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31 | } |
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32 | |
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33 | public void expand(TreePath path) { |
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34 | //System.out.println("Expand: " + path + " " + tree.isCollapsed(path) + " " + tree.isExpanded(path)); |
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35 | known.put(path, new Boolean(true)); |
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36 | tree.expandPath(path); |
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37 | } |
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38 | |
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39 | /* |
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40 | * TreeModelListener interface |
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41 | */ |
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42 | public void treeNodesChanged(TreeModelEvent e) { |
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43 | //System.out.println("changed: " + e); |
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44 | } |
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45 | |
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46 | public void treeNodesInserted(TreeModelEvent e) { |
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47 | //System.out.println("inserted: " + e); |
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48 | } |
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49 | |
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50 | public void treeNodesRemoved(TreeModelEvent e) { |
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51 | //System.out.println("removed: " + e); |
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52 | } |
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53 | |
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54 | public void treeStructureChanged(TreeModelEvent e) { |
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55 | //System.out.println("structChanged: " + e.getTreePath()); |
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56 | Boolean b = (Boolean)known.get(e.getTreePath()); |
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57 | if (b != null && b.booleanValue()) { |
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58 | // System.out.println("do expand"); |
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59 | //if (!tree.isExpanded(e.getTreePath())) { |
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60 | tree.expandPath(e.getTreePath()); |
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61 | //} |
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62 | //} else { |
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63 | //System.out.println("Do nothing: " + b); |
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64 | } |
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65 | } |
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66 | |
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67 | /* |
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68 | * TreeExpansionListener |
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69 | */ |
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70 | public void treeExpanded(TreeExpansionEvent event) { |
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71 | //System.out.println("expanded: " + event.getPath()); |
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72 | Boolean b = (Boolean)known.get(event.getPath()); |
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73 | if (b == null && !b.booleanValue()) { |
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74 | known.put(event.getPath(), Boolean.FALSE); |
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75 | } |
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76 | } |
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77 | |
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78 | public void treeCollapsed(TreeExpansionEvent event) { |
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79 | //System.out.println("collapsed: " + event.getPath()); |
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80 | Boolean b = (Boolean)known.get(event.getPath()); |
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81 | if (b != null && b.booleanValue()) { |
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82 | known.put(event.getPath(), Boolean.FALSE); |
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83 | } |
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84 | } |
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85 | } |
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