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Java多线程下载工具(四)

2012-04-05 15:35 本站整理 浏览(6)

4、悬浮窗体的实现:

效果图

代码:

首先在main窗体中定义一个悬浮窗体变量,并实力化

private SuspendWindow suspendWindow;
this.suspendWindow=new SuspendWindow(this);
悬浮窗体实现:
private MainFrame mainFrame;

	// 鼠标在悬浮图标中的坐标
	private int x;
	private int y;

	//右键菜单
	private JPopupMenu popupMenu = new JPopupMenu();
	private JMenuItem openItem=new JMenuItem("打开/关闭", ImageUtil.SUSPEND_OPEN_IMAGE);
	private JMenuItem addItem=new JMenuItem("新建下载任务", ImageUtil.SUSPEND_ADD_IMAGE);
	private JMenuItem removeItem=new JMenuItem("删除完成任务", ImageUtil.SUSPEND_REMOVE_IMAGE);
	private JMenuItem startItem=new JMenuItem("开始全部任务",  ImageUtil.SUSPEND_START_IMAGE);
	private JMenuItem pauseItem=new JMenuItem("暂停全部任务", ImageUtil.SUSPEND_PAUSE_IMAGE);
	private JMenuItem quitItem=new JMenuItem("推出", ImageUtil.SUSPEND_QUIT_IMAGE);
	
	
	private BufferedImage img = ImageUtil
			.getImage(ImageUtil.SUSPEND_IMAGE_PATH);

	

	@Override
	public void paint(Graphics g) {

		// TODO Auto-generated method stub
		g.drawImage(img, 0, 0, this);
	}
	
	//创建右键菜单
	private void createPopupMenu(){
		//加入菜单
		this.popupMenu.add(this.openItem);
		this.popupMenu .add(this.addItem);
		this.popupMenu .add(this.removeItem);
		this.popupMenu .add(this.startItem);
		this.popupMenu .add(this.pauseItem);
		this.popupMenu .add(this.quitItem );
		
	}

	public SuspendWindow(MainFrame mainFrame) {
		// TODO Auto-generated constructor stub
		this.mainFrame = mainFrame;
		// 得到屏幕大小
		Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
		// 设置窗口大小
		this.setSize(36, 36);
		// 设置窗口位置
		int locationX = screen.width - screen.width / 5;
		int locationY = screen.height - (int) (screen.height / 1.06);
		this.setLocation(locationX, locationY);
		// 设置该窗口总是在前
		this.setAlwaysOnTop(true);
		this.setVisible(true);
		
		initialListener();
		createPopupMenu();

	}

	public void initialListener() {
		this.addMouseMotionListener(new MouseMotionAdapter() {
			//实现悬浮窗口的拖动
			public void mouseDragged(MouseEvent e) {
				// 获得当前鼠标在屏幕中的坐标
				int xScreen = e.getXOnScreen();
				int yScreen = e.getYOnScreen();
				setLocation(xScreen - x, yScreen - y);
			}
		});
		//实现悬浮窗口的拖动,当用户对窗口进行拖动的时候再对窗口的位置进行相应的改变。
		this.addMouseListener(new MouseAdapter() {
			public void mousePressed(MouseEvent e) {
				x = e.getX();
				y = e.getY();
			}

			//当单击鼠标右键时显示菜单
			public void mouseReleased(MouseEvent e) {
				if (e.isPopupTrigger()) {
					popupMenu.show(SuspendWindow.this, e.getX(), e.getY());
				}
			}
		});
		

	}

上面的代码参考网上资料