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Using Canvas to hold Layout managers (Smart GWT)

/*  * SmartGWT (GWT for SmartClient)  * Copyright 2008 and beyond, Isomorphic Software, Inc.  *  * SmartGWT is free software; you can redistribute it and/or modify it  * under the terms of the GNU Lesser General Public License version 3  * as published by the Free Software Foundation.  SmartGWT is also  * available under typical commercial license terms - see  * http://smartclient.com/license  * This software is distributed in the hope that it will be useful,  * but WITHOUT ANY WARRANTY; without even the implied warranty of  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  * Lesser General Public License for more details.  */ package com.smartgwt.sample.showcase.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.user.client.ui.RootPanel; import com.smartgwt.client.types.Alignment; import com.smartgwt.client.widgets.Canvas; import com.smartgwt.client.widgets.Label; import com.smartgwt.client.widgets.layout.HLayout; import com.smartgwt.client.widgets.layout.VLayout; public class Showcase implements EntryPoint{     public void onModuleLoad() {        RootPanel.get().add(getViewPanel());     }     public Canvas getViewPanel() {       HLayout layout = new HLayout();       layout.setWidth100();       layout.setHeight100();       layout.setMembersMargin(20);       VLayout vLayout = new VLayout();       vLayout.setShowEdges(true);       vLayout.setWidth(150);       vLayout.setMembersMargin(5);       vLayout.setLayoutMargin(10);       vLayout.addMember(new BlueBox(null, 50, "height 50"));       vLayout.addMember(new BlueBox((String) null, "*", "height *"));       vLayout.addMember(new BlueBox((String) null, "30%", "height 30%"));       layout.addMember(vLayout);       HLayout hLayout = new HLayout();       hLayout.setShowEdges(true);       hLayout.setHeight(150);       hLayout.setMembersMargin(5);       hLayout.setLayoutMargin(10);       hLayout.addMember(new BlueBox(50, (Integer) null, "width 50"));       hLayout.addMember(new BlueBox("*", null, "width *"));       hLayout.addMember(new BlueBox("30%", null, "width 30%"));       layout.addMember(hLayout);       return layout;   }     class BlueBox extends Label {         public BlueBox(String contents) {             setAlign(Alignment.CENTER);             setBorder("1px solid #808080");             setBackgroundColor("lightblue");             setContents(contents);         }         public BlueBox(Integer width, Integer height, String contents) {             this(contents);             if (width != null) setWidth(width);             if (height != null) setHeight(height);         }         public BlueBox(Integer width, String height, String contents) {             this(contents);             if (width != null) setWidth(width);             if (height != null) setHeight(height);         }         public BlueBox(String width, String height, String contents) {             this(contents);             if (width != null) setWidth(width);             if (height != null) setHeight(height);         }     } }                  SmartGWT.zip( 9,880 k)