I’m currently participating on a software development project using the Google Web Toolkit (GWT). While developing the GUI for a certain part of this project, I came across the need of a group box panel.
For those who don’t know what a group box is; here is an example:

Fortunately this type of panel is directly supported by HTML throught the <fieldset>
tag. Unfortunately it isn’t supported by GWT (yet). However, it’s very simple to implement this using the SimplePanel
class provided by GWT.
import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Element; import com.google.gwt.user.client.ui.SimplePanel; /** * A group box panel (i.e. a frame where to which a caption can be * attached). The caption can be set via {@link #setCaption(String)}. * The content can be set via {@link SimplePanel#setWidget()}. * * @author Sebastian Krysmanski */ public class GroupBoxPanel extends SimplePanel { private final Element m_caption = DOM.createLegend(); public GroupBoxPanelImpl() { super(DOM.createFieldSet()); DOM.appendChild(getContainerElement(), this.m_caption); } public GroupBoxPanelImpl(String caption) { this(); setCaption(caption); } public String getCaption() { return DOM.getInnerText(this.m_caption); } public void setCaption(String caption) { DOM.setInnerText(this.m_caption, caption); } }
This code is released as public domain.
thank you very much
See http://www.gwtproject.org/javadoc/latest/com/google/gwt/user/client/ui/CaptionPanel.html