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);
}
}
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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>
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Output of the program
Download Source code
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