Tooltip — 为MenuItem实现Tooltip

Button button = new Button("Hover Over Me");  
button.setTooltip(new Tooltip("Tooltip for Button"));

Rectangle rect = new Rectangle(0, 0, 100, 100);  
Tooltip t = new Tooltip("A Square");  
Tooltip.install(rect, t);

curMenu.setOnMenuValidation(new EventHandler<Event>() {  
  
    @Override  
    public void handle(Event t) {  
        String help = "This is tooltip!";  
  
        if (tooltip == null) {  
            tooltip = new Tooltip();  
            tooltip.setWrapText(true);  
            tooltip.setTextAlignment(TextAlignment.LEFT);  
            tooltip.setPrefSize(200, 200);  
            tooltip.setMinSize(200, 100);  
        }  
        tooltip.setText(help);  
  
        Window window = target.getContextPane().getScene().getWindow();  
        double x = window.getX() + window.getWidth() - tooltip.getPrefWidth() - 50;  
        double y = window.getY() + 50;  
        tooltip.show(window, x, y);//将tooltip显示在Window的右上角  
    }  
});  
curMenu.setOnHidden(new EventHandler<Event>() {  
  
    @Override  
    public void handle(Event t) {  
        //这里所以菜单是共用的同一个tooltip  
        if (tooltip != null) {  
            tooltip.hide();  
        }  
    }  
});