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    <p>I guess a simple answer to this is to instantiate a widget to replace the standard Caption widget from DialogBox. I created a caption that has a button at right and you can pick a reference to it. Then you can add any click event you desire.</p> <p>In GWT 2.4 I used the following solution:</p> <pre><code>import com.google.gwt.event.dom.client.MouseDownHandler; import com.google.gwt.event.dom.client.MouseMoveHandler; import com.google.gwt.event.dom.client.MouseOutHandler; import com.google.gwt.event.dom.client.MouseOverHandler; import com.google.gwt.event.dom.client.MouseUpHandler; import com.google.gwt.event.dom.client.MouseWheelHandler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.safehtml.shared.SafeHtml; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.InlineLabel; import com.google.gwt.user.client.ui.PushButton; import com.google.gwt.user.client.ui.DialogBox.Caption; /** * @author Cristiano Sumariva */ public class ButtonCaption extends HorizontalPanel implements Caption { protected InlineLabel text; protected PushButton closeDialog; /** * @return the button at caption */ public PushButton getCloseButton() { return closeDialog; } public ButtonCaption( String label ) { super(); setWidth( "100%" ); setStyleName( "Caption" ); // so you have same styling as standard caption widget closeDialog = new PushButton(); add( text = new InlineLabel( label ) ); add( closeDialog ); setCellWidth( closeDialog, "1px" ); // to make button cell minimal enough to it } /* (non-Javadoc) * @see com.google.gwt.event.dom.client.HasMouseDownHandlers#addMouseDownHandler(com.google.gwt.event.dom.client.MouseDownHandler) */ @Override public HandlerRegistration addMouseDownHandler( MouseDownHandler handler ) { return addMouseDownHandler( handler ); } /* (non-Javadoc) * @see com.google.gwt.event.dom.client.HasMouseUpHandlers#addMouseUpHandler(com.google.gwt.event.dom.client.MouseUpHandler) */ @Override public HandlerRegistration addMouseUpHandler( MouseUpHandler handler ) { return addMouseUpHandler( handler ); } /* (non-Javadoc) * @see com.google.gwt.event.dom.client.HasMouseOutHandlers#addMouseOutHandler(com.google.gwt.event.dom.client.MouseOutHandler) */ @Override public HandlerRegistration addMouseOutHandler( MouseOutHandler handler ) { return addMouseOutHandler( handler ); } /* (non-Javadoc) * @see com.google.gwt.event.dom.client.HasMouseOverHandlers#addMouseOverHandler(com.google.gwt.event.dom.client.MouseOverHandler) */ @Override public HandlerRegistration addMouseOverHandler( MouseOverHandler handler ) { return addMouseOverHandler( handler ); } /* (non-Javadoc) * @see com.google.gwt.event.dom.client.HasMouseMoveHandlers#addMouseMoveHandler(com.google.gwt.event.dom.client.MouseMoveHandler) */ @Override public HandlerRegistration addMouseMoveHandler( MouseMoveHandler handler ) { return addMouseMoveHandler( handler ); } /* (non-Javadoc) * @see com.google.gwt.event.dom.client.HasMouseWheelHandlers#addMouseWheelHandler(com.google.gwt.event.dom.client.MouseWheelHandler) */ @Override public HandlerRegistration addMouseWheelHandler( MouseWheelHandler handler ) { return addMouseWheelHandler( handler ); } /* (non-Javadoc) * @see com.google.gwt.user.client.ui.HasHTML#getHTML() */ @Override public String getHTML() { return getElement().getInnerHTML(); } /* (non-Javadoc) * @see com.google.gwt.user.client.ui.HasHTML#setHTML(java.lang.String) */ @Override public void setHTML( String html ) { remove( text ); insert( text, 1 ); } /* (non-Javadoc) * @see com.google.gwt.user.client.ui.HasText#getText() */ @Override public String getText() { return text.getText(); } /* (non-Javadoc) * @see com.google.gwt.user.client.ui.HasText#setText(java.lang.String) */ @Override public void setText( String text ) { this.text.setText( text ); } /* (non-Javadoc) * @see com.google.gwt.safehtml.client.HasSafeHtml#setHTML(com.google.gwt.safehtml.shared.SafeHtml) */ @Override public void setHTML( SafeHtml html ) { setHTML( html.asString() ); } } </code></pre> <p>Extends the DialogBox to use the new ButtonCaption available</p> <pre><code>class CaptionCloseableDialogBox extends DialogBox { public CaptionCloseableDialogBox() { super( new ButtonCaption( "dialog box title" ) ); setAutoHideEnabled( false ); ButtonCaption ref = (ButtonCaption) this.getCaption(); PushButton closeButton = ref.getCloseButton(); // apply button face here closeButton; closeButton.addClickHandler( /* attach any click handler here like close this dialog */ ); } } </code></pre> <p>Hope it helps any.</p>
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