SWT笔记1，组件的关系，屏幕信息

import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Text;


/**
 * 测试父组件被释放，子组件或子窗口也将被释放
 * display为shell的父组件
 * shell可以为其他shell的父组件
 * 测试打印屏幕尺寸的方法
 *
 */
public class testShellTree {
	private Text text;



	/**
	 * Launch the application.
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			testShellTree window = new testShellTree();
			window.open();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Open the window.
	 */
	public void open() {
		Display display = Display.getDefault();
		
		
		//父窗口
		Shell shellParent = new Shell();
		shellParent.setSize(602, 300);
		shellParent.setText("Parent shell, close this one will close the child window, too");
		
		//释放display的按钮
		Button btn = new Button(shellParent, SWT.NONE);
		btn.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				Display.getDefault().dispose();
			}
		});
		btn.setBounds(10, 10, 193, 27);
		btn.setToolTipText("关闭display对象后，其所有子shell都将被关闭");

		btn.setText("click me to dispose the Display");
		
		//显示屏幕信息的文本框
		text = new Text(shellParent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.CANCEL | SWT.MULTI);
		text.setBounds(28, 91, 400, 127);
		String monitorInfo=Display.getDefault().getPrimaryMonitor().getBounds().toString();
		String clientAreaInfo=Display.getDefault().getPrimaryMonitor().getClientArea().toString();
		text.setText("屏幕大小为："+monitorInfo+"\n用户区域大小为(去掉了任务栏的大小)："+clientAreaInfo);
		
		
		//子窗口
		Shell shellChild=new Shell(shellParent);
		shellChild.setText("Child, can be closed independently");
		shellChild.setSize(400, 300);
		
		Button btn2 = new Button(shellChild, SWT.NONE);
		btn2.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				Display.getDefault().dispose();
			}
		});
		btn2.setToolTipText("关闭display对象后，其所有子shell都将被关闭");
		btn2.setBounds(10, 117, 193, 27);
		btn2.setText("click me to dispose the Display");
		
		shellChild.setLocation(shellParent.getLocation().x+400, shellParent.getLocation().y+200);
		
		shellParent.open();
		shellChild.open();
		shellParent.layout();
		
		//事件循环
		while (!shellParent.isDisposed()||!shellChild.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}
}