Create fake tooltips for items in a SWT table

1)

/**
 * Table that provides fake tooltips for items in a SWT table
 */
public class TooltipTable extends Table {
    private TooltipTableListener tableListener;

    protected void checkSubclass() {
    }

    public TooltipTable(Composite parent, int style) {
        super(parent, style);

        //1)
        setToolTipText("");

        //2)
        tableListener = new TooltipTableListener(this);
        addListener(SWT.Dispose, tableListener);
        addListener(SWT.KeyDown, tableListener);
        addListener(SWT.MouseExit, tableListener); //Hide tootip
        addListener(SWT.MouseDown, tableListener); //Hide tooltip
        addListener(SWT.MouseHover, tableListener); //Show tooltip
    }

    /** Default tooltip extracted from TableItem, subclass may override it */
    protected String getTooltip(TableItem item) {
        return "Hint: " + item.getText();
    }
}

2)

/**
 * Show tooltip when mouse hover TableItem
 * Hide tooltip when mouse out of TableItem and not in tooltip 
 */
public class TooltipTableListener implements Listener {
    private Shell tip;
    private Label label;
    private TooltipTable table;
    private TooltipLabelListener labelListener;
    //private String brokerName;
    private TableItem item;

    //It should > 0
    private int delayToRemoveTip = 100;
    
    //Remove tooltip when mouse out of the TableItem and not in tooltip
    private boolean isRemoveTip = true;

    public TooltipTableListener(TooltipTable table) {
        this.table = table;
        labelListener = new TooltipLabelListener();
    }

    public void handleEvent(Event event) {
        switch (event.type) {
        case SWT.Dispose:
        case SWT.KeyDown:
        case SWT.MouseDown:
        case SWT.MouseExit:
            isRemoveTip = true;
            disposeTooltip();
            break;
        case SWT.MouseHover:
            item = table.getItem(new Point(event.x, event.y));
            createTooltip();
        }
    }

    /**
     * Hide tooltip when mouse out of TableItem
     * Do it after some delay, if mouse go into tooltip, don't hide tooltip
     */
    class ReleaseTipThread extends Thread {
        public void run() {
            try {
                Thread.yield();
                Thread.sleep(delayToRemoveTip);
            } catch (Exception e) {
                e.printStackTrace();
            }

            Display.getDefault().asyncExec(new Runnable() {
                public void run() {
                    if (isRemoveTip && tip != null && !tip.isDisposed()) {
                        tip.dispose();
                        tip = null;
                    }
                }
            });
        }
    }

    private void disposeTooltip() {
        new ReleaseTipThread().start();        
    }

    private void createTooltip() {
        if (item == null) {
            disposeTooltip();
            return;
        }
        if (table.getTooltip(item) == null)
            return;

        if (tip == null || tip.isDisposed()) {
            Shell shell = table.getShell();
            Display display = table.getDisplay();

            tip = new Shell(shell, SWT.ON_TOP | SWT.TOOL);
            FillLayout layout = new FillLayout();
            tip.setLayout(layout);

            label = new Label(tip, SWT.NONE);
            //label.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
            //label.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
            label.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
            label.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
            label.addListener(SWT.MouseDown, labelListener);
            label.addListener(SWT.MouseHover, labelListener);
        }
        initTip();
    }

    private void initTip() {
        label.setData("_TABLEITEM", item);
        label.setText(table.getTooltip(item));
        Point size = tip.computeSize(SWT.DEFAULT, SWT.DEFAULT);
        Rectangle rect = item.getBounds(0);
        Point pt = table.toDisplay(rect.x, rect.y);
        tip.setBounds(pt.x, pt.y, size.x, size.y);
        tip.setVisible(true);
    }

    /** If MouseHover in the tooltip label, don't remove the tooltip */
    class TooltipLabelListener implements Listener {
        public void handleEvent(Event event) {
            Label label = (Label) event.widget;
            if ((label == null) || label.isDisposed())
                return;

            switch (event.type) {
            case SWT.MouseHover:
                isRemoveTip = false;
                break;
            case SWT.MouseDown:
                Event e = new Event();
                e.item = (TableItem) label.getData("_TABLEITEM");
                table.setSelection(new TableItem[] { (TableItem) e.item });
                table.notifyListeners(SWT.Selection, e);
                
                isRemoveTip = true;
                disposeTooltip();
            }
        }
    }
}