[3102] | 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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