stackLayout

stackLayout

    指的是堆叠布局，拥有该布局的控件可以包含若干控件，但是这些控件具有相同的大小和位置。每次通过指定布局的topControl属性来指定要显示的控件，而其他的控件不显示。指定显示的控件之后要调用包含该布局控件的layout方法重新布局，实例如下：

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StackLayout;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class StackLLayout1 {

    /**
     * Launch the application.
     * 
     * @param args
     */
    public static void main(String[] args) {
        Display display = Display.getDefault();
        Shell shell = new Shell();
        shell.setSize(450, 300);
        shell.setText("SWT Application");
        shell.setLayout(new FillLayout());

        final Composite comp1 = new Composite(shell, SWT.NONE);
        final StackLayout stackLayout = new StackLayout();

        comp1.setLayout(stackLayout);
        // 在comp1中创建两个文本框text
        final Text txt1 = new Text(comp1, SWT.BORDER);
        txt1.setText("txt1");
        final Text txt2 = new Text(comp1, SWT.BORDER);
        txt2.setText("txt2");
        //stackLayout.topControl = txt1;
        
        Composite comp2 = new Composite(shell, SWT.NONE);
        comp2.setLayout(new RowLayout());
        Button btnButton1 = new Button(comp2, SWT.NONE);
        btnButton1.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                stackLayout.topControl = txt1;   //必须指定显示的控件
                comp1.layout();    //重新布局
            }
        });
        btnButton1.setBounds(360, 10, 72, 22);
        btnButton1.setText("显示txt1");

        Button btnButton2 = new Button(comp2, SWT.NONE);
        btnButton2.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                stackLayout.topControl = txt2;
                comp1.layout();
            }
        });
        btnButton2.setBounds(360, 80, 72, 22);
        btnButton2.setText("显示txt2");

        shell.open();
        shell.layout();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
    }
}

结果如下：