- I know how to set custom leaf icons in JTree
- I know how to set custom closed/open icons for all group nodes
But I can not set custom open/closed icons based on the group node names, for example of node could be called Emails (so it is nice to have an envelop icon) or one group may be called tasks and so on.
I tried to do this by overriding the getTreeCellRendererComponent method of class DefaultTreeCellRenderer
But changing the icon for the current node will affect for the next node only!
How to set custom open/closed icons for individual groups?
Please take a look at my code:
Employee.java
package com.ehsunbehravesh.swing;
import java.util.Random;
public class Employee {
public String name;
public int id;
public boolean isBoss;
public Employee[] employees;
public Employee(String name, boolean isBoss) {
this.name = name;
this.isBoss = isBoss;
this.id = new Random(System.currentTimeMillis()).nextInt(Integer.MAX_VALUE);
}
@Override
public String toString() {
return this.name;
}
static String randomName() {
String chars = "abcdefghijklmnopqrstuvwxyz";
StringBuilder builder = new StringBuilder();
Random r = new Random(System.currentTimeMillis());
int length = r.nextInt(10) + 1;
for (int i = 0; i < length; i++) {
builder.append(chars.charAt(r.nextInt(chars.length())));
}
return builder.toString();
}
}
CustomTreeNode.java
package com.ehsunbehravesh.swing;
import javax.swing.ImageIcon;
import javax.swing.tree.DefaultMutableTreeNode;
public class CustomTreeNode extends DefaultMutableTreeNode {
/**
* The icon which is displayed on the JTree object. open, close, leaf icon.
*/
private ImageIcon icon;
public CustomTreeNode(ImageIcon icon) {
this.icon = icon;
}
public CustomTreeNode(ImageIcon icon, Object userObject) {
super(userObject);
this.icon = icon;
}
public CustomTreeNode(ImageIcon icon, Object userObject, boolean allowsChildren) {
super(userObject, allowsChildren);
this.icon = icon;
}
public ImageIcon getIcon() {
return icon;
}
public void setIcon(ImageIcon icon) {
this.icon = icon;
}
}
CustomeTreeCellRenderer.java
package com.ehsunbehravesh.swing;
import java.awt.Component;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellRenderer;
class CustomeTreeCellRenderer extends DefaultTreeCellRenderer {
public CustomeTreeCellRenderer() {
}
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
super.getTreeCellRendererComponent(tree, value, leaf, expanded, leaf, row, hasFocus);
if (!leaf) {
CustomTreeNode node = (CustomTreeNode) value;
System.out.println(((Employee) node.getUserObject()).name);
if (node.getIcon() != null) {
System.out.println(node.getIcon().toString());
setClosedIcon(node.getIcon());
setOpenIcon(node.getIcon());
} else {
setClosedIcon(getDefaultClosedIcon());
setClosedIcon(getDefaultOpenIcon());
setOpenIcon(getDefaultOpenIcon());
}
}
return this;
}
}
Test1.java
package com.ehsunbehravesh.swing;
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeModel;
class TreeSample {
public static void main(String args[]) {
JFrame f = new JFrame("JTree Sample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel pnlMain = new JPanel(new BorderLayout());
pnlMain.setBackground(Color.white);
createTree(pnlMain);
f.setContentPane(pnlMain);
f.setSize(300, 200);
f.setVisible(true);
}
private static void createTree(JPanel pnlMain) {
Employee bigBoss = new Employee(Employee.randomName(), true);
Employee[] level1 = new Employee[5];
bigBoss.employees = level1;
for (int i = 0; i < level1.length; i++) {
level1[i] = new Employee(Employee.randomName(), true);
}
for (int i = 0; i < level1.length; i++) {
Employee employee = level1[i];
if (employee.isBoss) {
int count = 5;
employee.employees = new Employee[count];
for (int j = 0; j < employee.employees.length; j++) {
employee.employees[j] = new Employee(Employee.randomName(), false);
}
}
}
CustomTreeNode root = new CustomTreeNode(new ImageIcon("images/Circle_3.gif"), bigBoss);
DefaultTreeModel model = new DefaultTreeModel(root);
for (Employee employee : bigBoss.employees) {
CustomTreeNode boss = new CustomTreeNode(new ImageIcon("images/Circle_2.gif"), employee);
root.add(boss);
if (employee.isBoss) {
for (Employee employee1 : employee.employees) {
CustomTreeNode emp = new CustomTreeNode(new ImageIcon("images/Circle_1.gif"), employee1);
boss.add(emp);
}
}
}
JTree tree = new JTree(model);
tree.setCellRenderer(new CustomeTreeCellRenderer());
pnlMain.add(tree, BorderLayout.CENTER);
}
}
