实践-全程

一、使用SWT本身

import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class LayoutUtil ...{

public static void centerShell(Display display,Shell shell)...{
        Rectangle displayBounds = display.getPrimaryMonitor().getBounds();
        Rectangle shellBounds = shell.getBounds();
int x = displayBounds.x + (displayBounds.width - shellBounds.width)>>1;
int y = displayBounds.y + (displayBounds.height - shellBounds.height)>>1;
        shell.setLocation(x, y);
    }
}

直接调用LayoutUtil.centerShell(Display display,Shell shell)即可使SWT窗口处于屏幕中央，其中，shell 要显示的Shell对象。
二、借助AWT包里面获取屏幕大小的方法

import java.awt.Toolkit;
/** *//**
* 在屏幕中间显示Shell
* @param shell 要显示的Shell对象
*/
private void centerShell(Shell shell)
...{
//得到屏幕的宽度和高度
int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
int screenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;
//得到Shell窗口的宽度和高度
int shellHeight = shell.getBounds().height;
int shellWidth = shell.getBounds().width;
//如果窗口大小超过屏幕大小，让窗口与屏幕等大
if(shellHeight > screenHeight)
                   shellHeight = screenHeight;
if(shellWidth > screenWidth)
                  shellWidth = screenWidth;
//让窗口在屏幕中间显示
        shell.setLocation(( (screenWidth - shellWidth) / 2),((screenHeight - shellHeight) / 2) );
}