SWT如何实现面板内容切换，解决方案（原创-logoc）
?????? 最近一直在做软件，采用了SWT插件，经过近1个多月的使用，对SWT有了初步的认识，今日刚刚解决SWT面板如实现内容切换，而非窗口切换做一些分享，希望对各位有所帮助！
?????? 建议入门同学读一下<理解SWT布局>这篇文章，多读几次也无妨。这是我的感受。
?????? 现在切入正题，如何解决面板内容切换问题！
????? ?在CSDN、百度、google我查了相关的资料，相关资料很少，不知道是我搜索关键字有问题还是其他原因。这个问题困扰我很久，网上提供的使用CTabItem的较多，但这是我想要的效果。我要的效果，是通过按钮实现内容切换而且，实现不同面板在不同的类中进行设计。经过反复调试测验，发现当我现在一个composite面板，调用setVisible(true/false)方法来实现面板的转换，但是发现不行，布局有问题，最后发现使用StackLayout()叠加布局类来实现。所有的面板都叠放在一起，通过按钮将需要的面板置顶即可。总体思路就是这样。如有描述错误，贻笑大方还请各位指点。
实现代码：可独立运行
?
package com.hbaas.main;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.custom.StackLayout;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import com.hbaas.composite.SystemSetComposite;
public class SystemFrame {
?protected Shell shell;
?protected Button systemBt ;
?protected Button nhinfoBt ;
?protected Composite systemComp;
?protected Composite nhinfoComp;
?protected StackLayout stackLayout = new StackLayout();
?protected Composite displayComp;
?/**
? * Launch the application.
? * @author 李亮
? * @param?Composite
? */
?public static void main(String[] args) {
??try {
???SystemFrame window = new SystemFrame();
???window.open();
??} catch (Exception e) {
???e.printStackTrace();
??}
?}
?/**
? * Open the window.
? */
?public void open() {
??Display display = Display.getDefault();
??createContents();
??shell.open();
??shell.layout();
??while (!shell.isDisposed()) {
???if (!display.readAndDispatch()) {
????display.sleep();
???}
??}
?}
?/**
? * Create contents of the window.
? */
?protected void createContents() {
??shell = new Shell(SWT.MIN | SWT.CLOSE);
??shell.setSize(1200, 800);
??shell.setLocation(Display.getCurrent().getClientArea().width/2 - shell.getShell().getSize().x/2, Display.getCurrent().getClientArea().height/2 - shell.getSize().y/2);
??
??shell.setText("湖北省xxxx系统");
??shell.setImage(new Image(null,"./icons/log.ico"));?
??shell.setLayout(new GridLayout());
??SashForm sashForm = new SashForm(shell, SWT.NONE);
?
??sashForm.setOrientation(SWT.VERTICAL);
??{
???GridData gridData = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
???gridData.widthHint = 1185;
???gridData.heightHint = 755;
???sashForm.setLayoutData(gridData);
??}
??
??final Composite controlComp = new Composite(sashForm,SWT.NONE);
??controlComp.setBackgroundImage(new Image(shell.getDisplay(),"./icons/top.gif"));
??final GridData controlGridata = new GridData(SWT.FILL,SWT.CENTER);??
??{
???systemBt = new Button(controlComp, SWT.NONE);
???systemBt.setBounds(579, 24, 100, 60);
???systemBt.setText("系统设置");
???nhinfoBt = new Button(controlComp, SWT.NONE);
???nhinfoBt.setBounds(739, 24, 100, 60);
???nhinfoBt.setText("农户信息");
???Button dataBt = new Button(controlComp, SWT.NONE);
???dataBt.setBounds(889, 24, 100, 60);
???dataBt.setText("数据交换");
???Button aboutBt = new Button(controlComp, SWT.NONE);
???aboutBt.setBounds(1040, 24, 100, 60);
???aboutBt.setText("关于");
??}
??controlComp.setLayoutData(controlGridata);
//??systemBt.addSelectionListener(new CompSelectionListener());
//??nhinfoBt.addSelectionListener(new CompSelectionListener());
??
??displayComp = new Composite(sashForm,SWT.NONE);
??displayComp.setLayout(stackLayout);
??
//??systemComp = createSystemComp(displayComp);
??systemComp = new SystemSetComposite().createFrame(displayComp);
??nhinfoComp = createNhInfoComp(displayComp);??
??stackLayout.topControl = systemComp;
?
??
??Listener listener = new Listener(){
???public void handleEvent(Event event) {
????if (event.widget == systemBt){
?????stackLayout.topControl = systemComp;
//?????System.out.println(systemBt.getText());
????}else if(event.widget == nhinfoBt){
?????stackLayout.topControl = nhinfoComp;
//?????System.out.println(nhinfoBt.getText());
????}?
????displayComp.layout();
???}???
??};
??systemBt.addListener(SWT.Selection , listener);
??nhinfoBt.addListener(SWT.Selection, listener);?
??sashForm.setWeights(new int[] {118, 681});
?}
?private Composite createSystemComp(Composite displayComp) {
??Composite comp = new Composite(displayComp, SWT.NONE);
??comp.setLayout(new GridLayout());
??new Label(comp, SWT.NONE).setText("系统面板");
??return comp;?
?}?
?private Composite createNhInfoComp(Composite displayComp) {
??Composite comp = new Composite(displayComp, SWT.NONE);
??comp.setLayout(new GridLayout());
??new Label(comp, SWT.NONE).setText("农户信息面板");
??return comp;??
?}
}
