Styles are applied to the widgets using CSS
stylesheets. Some of the commonly used GWT packages are discussed in
Table 4.1.
76 4 Ajax with Java-GWT
Table 4.1 GWT Packages
Package Description
com.google.gwt.core.client Core GWT classes that represent module entry
points and interface to JavaScript. For a class to
be a module entry point implement the
EntryPoint interface. The CatalogForm.java
class in the example GWT application
implements the EntryPoint interface.
com.google.gwt.user.client Provides classes representing a browser window
(Window class), browser??™s Document Object
Model (DOM class), DOM events (Event class).
Provides the EventListener interface for browser
events and the WindowCloseListener and
WindowResizeListener interfaces to receive
window closing and resizing events.
com.google.gwt.user.client.ui Provides classes representing widgets and
panels. For example the Button class represents
a button widget and the TextArea class
represents a text area widget. Most of the user
interface classes extend the Widget class. Panels
layout the widgets. For example, the
HorizontalPanel lays out the widgets
horizontally, the VerticalPanel lays out the
widgets vertically, and the DockPanel lays out
the widgets docked at the edges with the last
widget taking up the center space. The
FlowPanel lays out widgets in the HTML layout
pattern and the FormPanel lays out HTML
forms.
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