Eclipse Tutorial

Tray Tutorial

Tray和TrayItem是指在任务栏上的能代表程序的图标，和前面提到的TaskBar类似。比如我们常见的QQ，Skype等程序运行之后，在屏幕的右下角会有一个图标

先看一个示例吧：

    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Tray Tutorial");
    shell.setSize(300, 200);

    RowLayout layout = new RowLayout(SWT.HORIZONTAL);
    layout.spacing = 0;
    shell.setLayout(layout);

    Image image = new Image(display,
            TrayTutorial.class.getResourceAsStream("task.gif"));

    CLabel label = new CLabel(shell, SWT.CENTER);
    Tray tray = display.getSystemTray();
    if (tray == null) {
        label.setText("This platform does NOT support the tray.");
    } else {
        label.setText("Please visit the icon ");
        new CLabel(shell, SWT.CENTER).setImage(image);
        new CLabel(shell, SWT.CENTER).setText(" on System TaskBar.");
        // Create tray item.
        TrayItem item = new TrayItem(tray, SWT.NONE);
        // Set images.
        item.setImage(image);
        item.setHighlightImage(image);

        // Add tool tip.
        final ToolTip toolTip = new ToolTip(shell, SWT.BALLOON);
        toolTip.setText("Foxes vs. Dogs");
        toolTip.setMessage("A quick brown fox jumps over the lazy dog.");
        item.setToolTip(toolTip);

        // Add Selection and DefaultSelection Listener.
        item.addSelectionListener(new SelectionListener() {

            @Override
            public void widgetSelected(SelectionEvent e) {
                shell.moveAbove(null);
            }

            @Override
            public void widgetDefaultSelected(SelectionEvent e) {
                toolTip.setVisible(true);
            }
        });

        // Add Menu Listener.
        final Menu menu = new Menu(shell, SWT.POP_UP);
        for (int i = 0; i < 5; i++) {
            MenuItem menuItem = new MenuItem(menu, SWT.NONE);
            menuItem.setImage(image);
            menuItem.setText("MenuItem - " + i);
        }
        new MenuItem(menu, SWT.SEPARATOR);
        MenuItem exit = new MenuItem(menu, SWT.NONE);
        exit.setText("Exit");
        exit.addListener(SWT.Selection, new Listener() {

            @Override
            public void handleEvent(Event event) {
                shell.dispose();
            }
        });

        item.addMenuDetectListener(new MenuDetectListener() {

            @Override
            public void menuDetected(MenuDetectEvent e) {
                menu.setVisible(true);
            }
        });
    }

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

运行此段代码，会在TaskBar上出现一个图标，双击会出现ToolTip，右键点击会出现菜单。

参考资料： * Tray, TrayItem snippets * Sample code and further information

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