Java Tutorial/Swing/TreeModel
Содержание
Expand All for a tree path
<source lang="java">
/*
* soapUI, copyright (C) 2004-2009 eviware.ru * * soapUI is free software; you can redistribute it and/or modify it under the * terms of version 2.1 of the GNU Lesser General Public License as published by * the Free Software Foundation. * * soapUI is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Lesser General Public License for more details at gnu.org. */
import java.util.Enumeration; import javax.swing.JTree; import javax.swing.tree.TreeNode; import javax.swing.tree.TreePath; public class TreeUtils {
public static void expandAll(JTree tree, TreePath parent, boolean expand) {
// Traverse children
TreeNode node = (TreeNode) parent.getLastPathComponent();
if (node.getChildCount() >= 0) {
for (Enumeration e = node.children(); e.hasMoreElements();) {
TreeNode n = (TreeNode) e.nextElement();
TreePath path = parent.pathByAddingChild(n);
expandAll(tree, path, expand);
}
}
// Expansion or collapse must be done bottom-up
if (expand) {
tree.expandPath(parent);
} else {
tree.collapsePath(parent);
}
}
}</source>
Genealogy Tree
<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/*
* A 1.4 example that uses the following files: * GenealogyModel.java * Person.java * * Based on an example provided by tutorial reader Olivier Berlanger. */
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Vector; import javax.swing.ButtonGroup; import javax.swing.Icon; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JScrollPane; import javax.swing.JTree; import javax.swing.event.TreeModelEvent; import javax.swing.event.TreeModelListener; import javax.swing.tree.DefaultTreeCellRenderer; import javax.swing.tree.TreeModel; import javax.swing.tree.TreePath; import javax.swing.tree.TreeSelectionModel; public class GenealogyExample extends JPanel implements ActionListener {
GenealogyTree tree;
private static String SHOW_ANCESTOR_CMD = "showAncestor";
public GenealogyExample() {
super(new BorderLayout());
// Construct the panel with the toggle buttons.
JRadioButton showDescendant = new JRadioButton("Show descendants", true);
final JRadioButton showAncestor = new JRadioButton("Show ancestors");
ButtonGroup bGroup = new ButtonGroup();
bGroup.add(showDescendant);
bGroup.add(showAncestor);
showDescendant.addActionListener(this);
showAncestor.addActionListener(this);
showAncestor.setActionCommand(SHOW_ANCESTOR_CMD);
JPanel buttonPanel = new JPanel();
buttonPanel.add(showDescendant);
buttonPanel.add(showAncestor);
// Construct the tree.
tree = new GenealogyTree(getGenealogyGraph());
JScrollPane scrollPane = new JScrollPane(tree);
scrollPane.setPreferredSize(new Dimension(200, 200));
// Add everything to this panel.
add(buttonPanel, BorderLayout.PAGE_START);
add(scrollPane, BorderLayout.CENTER);
}
/**
* Required by the ActionListener interface. Handle events on the
* showDescendant and showAncestore buttons.
*/
public void actionPerformed(ActionEvent ae) {
if (ae.getActionCommand() == SHOW_ANCESTOR_CMD) {
tree.showAncestor(true);
} else {
tree.showAncestor(false);
}
}
/**
* Constructs the genealogy graph used by the model.
*/
public Person getGenealogyGraph() {
// the greatgrandparent generation
Person a1 = new Person("Jack (great-granddaddy)");
Person a2 = new Person("Jean (great-granny)");
Person a3 = new Person("Albert (great-granddaddy)");
Person a4 = new Person("Rae (great-granny)");
Person a5 = new Person("Paul (great-granddaddy)");
Person a6 = new Person("Josie (great-granny)");
// the grandparent generation
Person b1 = new Person("Peter (grandpa)");
Person b2 = new Person("Zoe (grandma)");
Person b3 = new Person("Simon (grandpa)");
Person b4 = new Person("James (grandpa)");
Person b5 = new Person("Bertha (grandma)");
Person b6 = new Person("Veronica (grandma)");
Person b7 = new Person("Anne (grandma)");
Person b8 = new Person("Renee (grandma)");
Person b9 = new Person("Joseph (grandpa)");
// the parent generation
Person c1 = new Person("Isabelle (mom)");
Person c2 = new Person("Frank (dad)");
Person c3 = new Person("Louis (dad)");
Person c4 = new Person("Laurence (dad)");
Person c5 = new Person("Valerie (mom)");
Person c6 = new Person("Marie (mom)");
Person c7 = new Person("Helen (mom)");
Person c8 = new Person("Mark (dad)");
Person c9 = new Person("Oliver (dad)");
// the youngest generation
Person d1 = new Person("Clement (boy)");
Person d2 = new Person("Colin (boy)");
Person.linkFamily(a1, a2, new Person[] { b1, b2, b3, b4 });
Person.linkFamily(a3, a4, new Person[] { b5, b6, b7 });
Person.linkFamily(a5, a6, new Person[] { b8, b9 });
Person.linkFamily(b3, b6, new Person[] { c1, c2, c3 });
Person.linkFamily(b4, b5, new Person[] { c4, c5, c6 });
Person.linkFamily(b8, b7, new Person[] { c7, c8, c9 });
Person.linkFamily(c4, c7, new Person[] { d1, d2 });
return a1;
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("GenealogyExample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
GenealogyExample newContentPane = new GenealogyExample();
newContentPane.setOpaque(true); // content panes must be opaque
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application"s GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
} /*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - Neither the name of Sun Microsystems nor the names of its contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */
class Person {
Person father;
Person mother;
Vector<Person> children;
private String name;
public Person(String name) {
this.name = name;
mother = father = null;
children = new Vector<Person>();
}
/**
* Link together all members of a family.
*
* @param pa
* the father
* @param ma
* the mother
* @param kids
* the children
*/
public static void linkFamily(Person pa, Person ma, Person[] kids) {
for (Person kid : kids) {
pa.children.addElement(kid);
ma.children.addElement(kid);
kid.father = pa;
kid.mother = ma;
}
}
// / getter methods ///////////////////////////////////
public String toString() {
return name;
}
public String getName() {
return name;
}
public Person getFather() {
return father;
}
public Person getMother() {
return mother;
}
public int getChildCount() {
return children.size();
}
public Person getChildAt(int i) {
return (Person) children.elementAt(i);
}
public int getIndexOfChild(Person kid) {
return children.indexOf(kid);
}
} /*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - Neither the name of Sun Microsystems nor the names of its contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */
class GenealogyTree extends JTree {
GenealogyModel model;
public GenealogyTree(Person graphNode) {
super(new GenealogyModel(graphNode));
getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION);
DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
Icon personIcon = null;
renderer.setLeafIcon(personIcon);
renderer.setClosedIcon(personIcon);
renderer.setOpenIcon(personIcon);
setCellRenderer(renderer);
}
/**
* Get the selected item in the tree, and call showAncestor with this item on
* the model.
*/
public void showAncestor(boolean b) {
Object newRoot = null;
TreePath path = getSelectionModel().getSelectionPath();
if (path != null) {
newRoot = path.getLastPathComponent();
}
((GenealogyModel) getModel()).showAncestor(b, newRoot);
}
} /*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * - Neither the name of Sun Microsystems nor the names of its contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */
class GenealogyModel implements TreeModel {
private boolean showAncestors;
private Vector<TreeModelListener> treeModelListeners = new Vector<TreeModelListener>();
private Person rootPerson;
public GenealogyModel(Person root) {
showAncestors = false;
rootPerson = root;
}
/**
* Used to toggle between show ancestors/show descendant and to change the
* root of the tree.
*/
public void showAncestor(boolean b, Object newRoot) {
showAncestors = b;
Person oldRoot = rootPerson;
if (newRoot != null) {
rootPerson = (Person) newRoot;
}
fireTreeStructureChanged(oldRoot);
}
// ////////////// Fire events //////////////////////////////////////////////
/**
* The only event raised by this model is TreeStructureChanged with the root
* as path, i.e. the whole tree has changed.
*/
protected void fireTreeStructureChanged(Person oldRoot) {
int len = treeModelListeners.size();
TreeModelEvent e = new TreeModelEvent(this, new Object[] { oldRoot });
for (TreeModelListener tml : treeModelListeners) {
tml.treeStructureChanged(e);
}
}
// ////////////// TreeModel interface implementation ///////////////////////
/**
* Adds a listener for the TreeModelEvent posted after the tree changes.
*/
public void addTreeModelListener(TreeModelListener l) {
treeModelListeners.addElement(l);
}
/**
* Returns the child of parent at index index in the parent"s child array.
*/
public Object getChild(Object parent, int index) {
Person p = (Person) parent;
if (showAncestors) {
if ((index > 0) && (p.getFather() != null)) {
return p.getMother();
}
return p.getFather();
}
return p.getChildAt(index);
}
/**
* Returns the number of children of parent.
*/
public int getChildCount(Object parent) {
Person p = (Person) parent;
if (showAncestors) {
int count = 0;
if (p.getFather() != null) {
count++;
}
if (p.getMother() != null) {
count++;
}
return count;
}
return p.getChildCount();
}
/**
* Returns the index of child in parent.
*/
public int getIndexOfChild(Object parent, Object child) {
Person p = (Person) parent;
if (showAncestors) {
int count = 0;
Person father = p.getFather();
if (father != null) {
count++;
if (father == child) {
return 0;
}
}
if (p.getMother() != child) {
return count;
}
return -1;
}
return p.getIndexOfChild((Person) child);
}
/**
* Returns the root of the tree.
*/
public Object getRoot() {
return rootPerson;
}
/**
* Returns true if node is a leaf.
*/
public boolean isLeaf(Object node) {
Person p = (Person) node;
if (showAncestors) {
return ((p.getFather() == null) && (p.getMother() == null));
}
return p.getChildCount() == 0;
}
/**
* Removes a listener previously added with addTreeModelListener().
*/
public void removeTreeModelListener(TreeModelListener l) {
treeModelListeners.removeElement(l);
}
/**
* Messaged when the user has altered the value for the item identified by
* path to newValue. Not used by this model.
*/
public void valueForPathChanged(TreePath path, Object newValue) {
System.out
.println("*** valueForPathChanged : " + path + " --> " + newValue);
}
}</source>
Get tree path from TreeNode
<source lang="java">
import java.util.ArrayList; import java.util.List; import javax.swing.tree.TreeNode; import javax.swing.tree.TreePath; public class Utils {
public static TreePath getPath(TreeNode treeNode) {
List<Object> nodes = new ArrayList<Object>();
if (treeNode != null) {
nodes.add(treeNode);
treeNode = treeNode.getParent();
while (treeNode != null) {
nodes.add(0, treeNode);
treeNode = treeNode.getParent();
}
}
return nodes.isEmpty() ? null : new TreePath(nodes.toArray());
}
}</source>
implements TreeModel
<source lang="java">
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.util.Enumeration; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTree; import javax.swing.UIDefaults; import javax.swing.UIManager; import javax.swing.WindowConstants; import javax.swing.event.TreeModelListener; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.TreeModel; import javax.swing.tree.TreePath; public class UIDefaultsTreeModel implements TreeModel {
DefaultTreeModel innerModel;
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("UIDefaults");
DefaultMutableTreeNode colorNode = new DefaultMutableTreeNode("Color Resources");
DefaultMutableTreeNode borderNode = new DefaultMutableTreeNode("Border Resources");
DefaultMutableTreeNode fontNode = new DefaultMutableTreeNode("Font Resources");
DefaultMutableTreeNode iconNode = new DefaultMutableTreeNode("Icon Resources");
DefaultMutableTreeNode otherNode = new DefaultMutableTreeNode("Other Resources");
public UIDefaultsTreeModel() {
innerModel = new DefaultTreeModel(rootNode);
innerModel.insertNodeInto(colorNode, rootNode, 0);
innerModel.insertNodeInto(borderNode, rootNode, 1);
innerModel.insertNodeInto(fontNode, rootNode, 2);
innerModel.insertNodeInto(iconNode, rootNode, 3);
innerModel.insertNodeInto(otherNode, rootNode, 4);
UIDefaults defaults = UIManager.getDefaults();
Enumeration elems = defaults.keys();
String keyName;
Object valueForKey;
while (elems.hasMoreElements()) {
DefaultMutableTreeNode newKeyNode;
DefaultMutableTreeNode newValueNode;
try {
keyName = elems.nextElement().toString();
valueForKey = defaults.get(keyName);
newKeyNode = new DefaultMutableTreeNode(keyName);
newValueNode = new DefaultMutableTreeNode(valueForKey);
if (valueForKey instanceof java.awt.Color) {
innerModel.insertNodeInto(newKeyNode, colorNode, 0);
} else if (valueForKey instanceof javax.swing.border.Border) {
innerModel.insertNodeInto(newKeyNode, borderNode, 0);
} else if (valueForKey instanceof java.awt.Font) {
innerModel.insertNodeInto(newKeyNode, fontNode, 0);
} else if (valueForKey instanceof javax.swing.Icon) {
innerModel.insertNodeInto(newKeyNode, iconNode, 0);
} else {
innerModel.insertNodeInto(newKeyNode, otherNode, 0);
}
innerModel.insertNodeInto(newValueNode, newKeyNode, 0);
} catch (NullPointerException e) {
}
}
}
public Object getRoot() {
return innerModel.getRoot();
}
public Object getChild(Object parm1, int parm2) {
return innerModel.getChild(parm1, parm2);
}
public int getChildCount(Object parm1) {
return innerModel.getChildCount(parm1);
}
public boolean isLeaf(Object parm1) {
return innerModel.isLeaf(parm1);
}
public void valueForPathChanged(TreePath parm1, Object parm2) {
innerModel.valueForPathChanged(parm1, parm2);
}
public int getIndexOfChild(Object parm1, Object parm2) {
return innerModel.getIndexOfChild(parm1, parm2);
}
public void addTreeModelListener(TreeModelListener parm1) {
innerModel.addTreeModelListener(parm1);
}
public void removeTreeModelListener(TreeModelListener parm1) {
innerModel.removeTreeModelListener(parm1);
}
public static void main(String[] args) {
JFrame treeFrame1 = new JFrame();
JScrollPane jScrollPane1 = new JScrollPane();
JTree jTree1 = new JTree(new UIDefaultsTreeModel());
treeFrame1.setSize(new Dimension(400, 300));
treeFrame1.addWindowListener(new WindowAdapter() {
public void windowClosed(WindowEvent e) {
System.exit(0);
}
});
treeFrame1.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
treeFrame1.getContentPane().add(jScrollPane1, BorderLayout.CENTER);
jScrollPane1.getViewport().add(jTree1, null);
treeFrame1.setVisible(true);
}
}</source>
JTree.getModel().addTreeModelListener(new TreeModelListener())
<source lang="java">
import java.awt.Dimension; import java.awt.FlowLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTree; import javax.swing.event.TreeExpansionEvent; import javax.swing.event.TreeExpansionListener; import javax.swing.event.TreeModelEvent; import javax.swing.event.TreeModelListener; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreePath; import javax.swing.tree.TreeSelectionModel; public class Main {
public static void main(String args[]) {
JFrame f = new JFrame("JTree Demo");
f.setSize(260, 240);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode aNode = new DefaultMutableTreeNode("A");
root.add(aNode);
DefaultMutableTreeNode bNode = new DefaultMutableTreeNode("B");
aNode.add(bNode);
DefaultMutableTreeNode cNode = new DefaultMutableTreeNode("C");
aNode.add(cNode);
cNode.add(new DefaultMutableTreeNode("D"));
cNode.add(new DefaultMutableTreeNode("E"));
DefaultMutableTreeNode fNode = new DefaultMutableTreeNode("F");
root.add(fNode);
DefaultMutableTreeNode gNode = new DefaultMutableTreeNode("G");
fNode.add(gNode);
fNode.add(new DefaultMutableTreeNode("H"));
gNode.add(new DefaultMutableTreeNode("I"));
JTree jtree = new JTree(root);
jtree.setEditable(true);
TreeSelectionModel tsm = jtree.getSelectionModel();
tsm.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
jtree.addTreeExpansionListener(new TreeExpansionListener() {
public void treeExpanded(TreeExpansionEvent tee) {
TreePath tp = tee.getPath();
System.out.println("Expansion: " + tp.getLastPathComponent());
}
public void treeCollapsed(TreeExpansionEvent tee) {
TreePath tp = tee.getPath();
System.out.println("Collapse: " + tp.getLastPathComponent());
}
});
jtree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent tse) {
TreePath tp = tse.getPath();
System.out.println("Selection event: " + tp.getLastPathComponent());
}
});
jtree.getModel().addTreeModelListener(new TreeModelListener() {
public void treeNodesChanged(TreeModelEvent tme) {
TreePath tp = tme.getTreePath();
Object[] children = tme.getChildren();
DefaultMutableTreeNode changedNode;
if (children != null)
changedNode = (DefaultMutableTreeNode) children[0];
else
changedNode = (DefaultMutableTreeNode) tp.getLastPathComponent();
System.out.println("Model change path: " + tp + "New data: "
+ changedNode.getUserObject());
}
public void treeNodesInserted(TreeModelEvent tme) {
}
public void treeNodesRemoved(TreeModelEvent tme) {
}
public void treeStructureChanged(TreeModelEvent tme) {
}
});
f.add(new JScrollPane(jtree));
f.setVisible(true);
}
}</source>
Tree node editing with DefaultTreeModel
<source lang="java">
import java.awt.BorderLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.JTree; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.MutableTreeNode; import javax.swing.tree.TreePath; public class MainClass {
public static void main(String[] args) {
MutableTreeNode root = new DefaultMutableTreeNode("A");
MutableTreeNode beams = new DefaultMutableTreeNode("B");
MutableTreeNode gears = new DefaultMutableTreeNode("C");
root.insert(beams, 0);
root.insert(gears, 1);
beams.insert(new DefaultMutableTreeNode("4 "), 0);
beams.insert(new DefaultMutableTreeNode("6 "), 1);
beams.insert(new DefaultMutableTreeNode("8 "), 2);
beams.insert(new DefaultMutableTreeNode("12 "), 3);
gears.insert(new DefaultMutableTreeNode("8t"), 0);
gears.insert(new DefaultMutableTreeNode("24t"), 1);
gears.insert(new DefaultMutableTreeNode("40t"), 2);
final DefaultTreeModel model = new DefaultTreeModel(root);
final JTree tree = new JTree(model);
final JTextField nameField = new JTextField("16t");
final JButton button = new JButton("Add a part");
button.setEnabled(false);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
TreePath tp = tree.getSelectionPath();
MutableTreeNode insertNode = (MutableTreeNode) tp.getLastPathComponent();
int insertIndex = 0;
if (insertNode.getParent() != null) {
MutableTreeNode parent = (MutableTreeNode) insertNode.getParent();
insertIndex = parent.getIndex(insertNode) + 1;
insertNode = parent;
}
MutableTreeNode node = new DefaultMutableTreeNode(nameField.getText());
model.insertNodeInto(node, insertNode, insertIndex);
}
});
JPanel addPanel = new JPanel(new GridLayout(2, 1));
addPanel.add(nameField);
addPanel.add(button);
tree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent e) {
TreePath tp = e.getNewLeadSelectionPath();
button.setEnabled(tp != null);
}
});
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(200, 200);
frame.getContentPane().add(new JScrollPane(tree));
frame.getContentPane().add(addPanel, BorderLayout.SOUTH);
frame.setVisible(true);
}
}</source>
