GWT Composite Widget

Class Methods

1. protected Widget getWidget()
   Access to the topmost Widget that defines this composite is available to subclasses.
    
2. protected void initWidget(Widget widget)
   Creates a composite wrapper for the Widget.
    
3. boolean isAttached()
   Checks to see if this Widget is now affixed to the browser's content (i.e., an unbroken chain of widgets between this Widget and the underlying browser document).
    
4. protected void onAttach()
   When a widget is added to the browser's document, this method is invoked.
    
5. void onBrowserEvent(Event event)
   Whenever a browser event is received, it is fired.
    
6. protected void onDetach()
   When a widget is removed from the browser's document, this function is invoked.
    
7. protected void setWidget(Widget widget)
   Deprecated. Instead, use initWidget(Widget).
    
8. Void claimElement(Element element)
   The element is assumed to have been produced and stamped through a prior call to IsRenderable.render, and it should replace the existing contents of the receiver (com.google.gwt.user.client.ui.RenderableStamper).
    
9. initializeClaimedElement()
   When the Widget is not attached to the document, carry out any required initialization.
    
10. isAttached()
    Checks to see if this Widget is now affixed to the browser's content (i.e., if there is an unbroken chain of widgets between the Widget and the underlying browser document).

Methods Inherited

The following classes have methods that this class inherits:

com.google.gwt.user.client.ui.UIObject: Some of these are addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler.

com.google.gwt.user.client.ui.Widget: Some of these are addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId.

java.lang.Object: Some of these are clone, equals, finalize, getClass, hashCode, notify.

Steps to Create a Composite Widget.

• In accordance with the GWT - Create Application instructions, create a project with the name xyz under the package abc.
• Make the changes outlined to abc.gwr.xml, abc.css, abc.html, and abc.java. 
• Compile and execute the application to validate the result of the implemented logic.

Frequently Asked Questions

What is a composite widget?

A type of Widget called the Composite can encase another widget, obscuring its functions in the process. A composite functions exactly as if the Widget it wraps had been added when it is introduced to a panel.

What is the GWT's purpose?

A GWT development toolkit is used to create and improve sophisticated browser-based apps. GWT's objective is to make it possible to construct high-performance web apps productively without the developer having to be an expert in JavaScript, XMLHttpRequest, or browser quirks.

What benefits does GWT offer?

If we are experienced Java programmers with knowledge of Swing or AWT, selecting GWT should be simple. With this foundation, the learning curve is the shortest. Even if you lack experience in Java GUI development, the years spent working on server-side Java will be helpful when creating GWT applications.

What characteristics does GWT have?

Asynchronous remote procedure calls, history management, bookmarking, UI abstraction, internationalization, and cross-browser portability are just a few of GWT's reusable methods for basic web development tasks.

What is GWT format?

Switching between several locales for formatting dates and numbers at runtime distinguishes the GWT classes from the common Java classes. Only the logic required for the current locale is loaded into the application in GWT using the deferred binding approach.

Conclusion

In this article, we learned about the GWT composite widgets with the different types of methods used. 

If you want to learn more, check out our articles on Object Marshalling in Ruby, Tainting Objects in Ruby, Copying Objects In Ruby, How To Invoke Global Functions In Ruby?, and Object References in Ruby.

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