Creating Tree Structure using GWT

This example describes the Basics for building the Tree Structure using GWT.

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Creating Tree Structure using GWT

     

This example describes the Basics for building the Tree Structure using GWT. The steps involved in Building the Tree Structure are described below:-

final Label label = new Label("Click the Node to view Tree structure")
Here we are declaring label. Label is a widget that contains text.

Tree Item root = new TreeItem("Vowels")
Creating tree item i.e. creating root for tree.TreeItem is a class. In this an item can be contained within a tree.

root.addItem("a")
This is the method for adding an item to the root of the tree. Here we are adding a to the tree name "root".

Tree t = new Tree()
Tree is a class and it contains a hierarchy of tree items that user can open and close.

Treeexample.java

package org.yournamehere.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TreeItem;
import com.google.gwt.user.client.ui.Tree;

public class Treeexample implements EntryPoint {
final Label label = new Label("Click the Node to view Tree structure");
public void onModuleLoad() {
  TreeItem root = new TreeItem("Vowels");
  root.addItem("a");
  root.addItem("e");
  root.addItem("i");
  root.addItem("o");
  root.addItem("u");
 TreeItem root1 = new TreeItem("Digits")
  root1.addItem("1");
  root1.addItem("2");
  root1.addItem("3");
  root1.addItem("4");
  root1.addItem("5");

  TreeItem item = new TreeItem();
  root.addItem(item);
  root1.addItem(item);
  Tree t = new Tree();
  t.addItem(root);
  t.addItem(root1);
  RootPanel.get().add(label);
  RootPanel.get().add(t);
  }
}

Main.gwt.xml

<?xml version="1.0" encoding="UTF-8"?>
<module>
  <inherits name="com.google.gwt.user.User"/>
  <entry-point class="org.yournamehere.client.Treeexample"/>
  
</module>

Output of the program

Download Source code

     

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Creating Tree Structure using GWT

Posted on: October 6, 2008 If you enjoyed this post then why not add us on Google+? Add us to your Circles

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