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GWT - DeckPanel Widget
Introduction
The DeckPanel widget represents a panel that displays all of its child widgets in a 'deck', where only one can be visible at a time. It is used by TabPanel.
Class Declaration
Following is the declaration for com.google.gwt.user.client.ui.DeckPanel class −
public class DeckPanel extends ComplexPanel implements HasAnimation, InsertPanel.ForIsWidget
Class Constructors
Sr.No. | Constructor & Description |
---|---|
1 |
DeckPanel() Constructor for DeckPanel. |
Class Methods
Sr.No. | Function name & Description |
---|---|
1 |
void add(Widget w) Adds a child widget. |
2 |
int getVisibleWidget() Gets the index of the currently-visible widget. |
3 |
void insert(IsWidget w, int beforeIndex) |
4 |
void insert(Widget w, int beforeIndex) Inserts a child widget before the specified index. |
5 |
boolean isAnimationEnabled() Returns true if animations are enabled, false if not. |
6 |
boolean remove(Widget w) Removes a child widget. |
7 |
void setAnimationEnabled(boolean enable) Enable or disable animations. |
8 |
void showWidget(int index) Shows the widget at the specified index. |
Methods Inherited
This class inherits methods from the following classes −
com.google.gwt.user.client.ui.UIObject
com.google.gwt.user.client.ui.Widget
com.google.gwt.user.client.ui.Panel
com.google.gwt.user.client.ui.ComplexPanel
java.lang.Object
DeckPanel Widget Example
This example will take you through simple steps to show usage of a DeckPanel Widget in GWT. Follow the following steps to update the GWT application we created in GWT - Create Application chapter −
Step | Description |
---|---|
1 | Create a project with a name HelloWorld under a package com.tutorialspoint as explained in the GWT - Create Application chapter. |
2 | Modify HelloWorld.gwt.xml, HelloWorld.css, HelloWorld.html and HelloWorld.java as explained below. Keep rest of the files unchanged. |
3 | Compile and run the application to verify the result of the implemented logic. |
Following is the content of the modified module descriptor src/com.tutorialspoint/HelloWorld.gwt.xml.
<?xml version = "1.0" encoding = "UTF-8"?> <module rename-to = 'helloworld'> <!-- Inherit the core Web Toolkit stuff. --> <inherits name = 'com.google.gwt.user.User'/> <!-- Inherit the default GWT style sheet. --> <inherits name = 'com.google.gwt.user.theme.clean.Clean'/> <!-- Specify the app entry point class. --> <entry-point class = 'com.tutorialspoint.client.HelloWorld'/> <!-- Specify the paths for translatable code --> <source path = 'client'/> <source path = 'shared'/> </module>
Following is the content of the modified Style Sheet file war/HelloWorld.css.
body { text-align: center; font-family: verdana, sans-serif; } h1 { font-size: 2em; font-weight: bold; color: #777777; margin: 40px 0px 70px; text-align: center; } .deckpanel { border: 1px solid #BBBBBB; padding: 3px; }
Following is the content of the modified HTML host file war/HelloWorld.html.
<html> <head> <title>Hello World</title> <link rel = "stylesheet" href = "HelloWorld.css"/> <script language = "javascript" src = "helloworld/helloworld.nocache.js"> </script> </head> <body> <h1>DeckPanel Widget Demonstration</h1> <div id = "gwtContainer"></div> </body> </html>
Let us have following content of Java file src/com.tutorialspoint/HelloWorld.java which will demonstrate use of DeckPanel widget.
package com.tutorialspoint.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.DeckPanel; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.RootPanel; import com.google.gwt.user.client.ui.VerticalPanel; public class HelloWorld implements EntryPoint { public void onModuleLoad() { // Create DeckPanel widget final DeckPanel deckPanel = new DeckPanel(); deckPanel.setSize("300px", "120px"); deckPanel.setStyleName("deckpanel"); // Create lables to add to deckpanel Label label1 = new Label("This is first Page"); Label label2 = new Label("This is second Page"); Label label3 = new Label("This is third Page"); // Add labels to deckpanel deckPanel.add(label1); deckPanel.add(label2); deckPanel.add(label3); //show first label deckPanel.showWidget(0); //create button bar HorizontalPanel buttonBar = new HorizontalPanel(); buttonBar.setSpacing(5); // create button and add click handlers // show different labels on click of different buttons Button button1 = new Button("Page 1"); button1.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { deckPanel.showWidget(0); } }); Button button2 = new Button("Page 2"); button2.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { deckPanel.showWidget(1); } }); Button button3 = new Button("Page 3"); button3.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { deckPanel.showWidget(2); } }); buttonBar.add(button1); buttonBar.add(button2); buttonBar.add(button3); VerticalPanel vPanel = new VerticalPanel(); vPanel.add(deckPanel); vPanel.add(buttonBar); // Add the widgets to the root panel. RootPanel.get().add(vPanel); } }
Once you are ready with all the changes done, let us compile and run the application in development mode as we did in GWT - Create Application chapter. If everything is fine with your application, this will produce following result −