如何使工具提示对鼠标事件透明?

时间:2015-07-15 18:00:21

标签: java javafx

javafx.scene.Node能够使其对鼠标事件透明,因此不会被选为此类事件的目标:

  

Node.mouseTransparentProperty()
  如果为true,则此节点(及其所有子节点)对鼠标事件完全透明。选择鼠标事件的目标时,将mouseTransparent设置为true的节点及其子树不会被考虑在内。

不幸的是,javafx.scene.control.Tooltip尚未实现此功能 有一个开放的功能request - 但在这个主题上似乎没有很多活动。

我的问题是:这有什么解决方法吗?如何将鼠标事件的工具提示透明化以将鼠标事件路由到基础控件?

1 个答案:

答案 0 :(得分:1)

如果有人仍在寻找解决方案。我在javafx-8中发现了一种骇人听闻的方法(使用内部API!)。它可能是在Javafx-8 +中进行了修补,因此从可维护性的角度来看,这不是一个好选择,但至少可以做到:

    public static boolean correctNativeMouseEvent(MouseEvent event, Scene exclude)
    {
        Scene targetScene = getTargetScreen(event, exclude);
        if(targetScene != null)
        {
            PickResultChooser chooser = new PickResultChooser();

            targetScene.getRoot().impl_pickNode(new PickRay(event.getScreenX() - targetScene.getWindow().getX() - targetScene.getX(),
                    event.getScreenY() - targetScene.getWindow().getY() - targetScene.getY(),
                    1, Double.NEGATIVE_INFINITY, Double.POSITIVE_INFINITY), chooser);

            PickResult res = chooser.toPickResult();
            if(res != null)
            {
                Point2D pos = res.getIntersectedNode().localToScene(res.getIntersectedPoint().getX(), res.getIntersectedPoint().getY());

                MouseEvent newEvent = new MouseEvent(null, null, event.getEventType(), pos.getX(), pos.getY(),
                        event.getScreenX(), event.getScreenY(),
                        event.getButton(), event.getClickCount(),
                        event.isShiftDown(), event.isControlDown(), event.isAltDown(), event.isMetaDown(),
                        event.isPrimaryButtonDown(), event.isMiddleButtonDown(), event.isSecondaryButtonDown(),
                        event.isSynthesized(), event.isPopupTrigger(), event.isStillSincePress(), res);

                targetScene.impl_processMouseEvent(newEvent);
                return true;
            }
        }
        return false;
    }

    static Scene getTargetScreen(MouseEvent event, Scene exclude)
    {
        double x = event.getScreenX();
        double y = event.getScreenY();

        double sx, sy, sw, sh;

        Iterator<Window> itr = Window.impl_getWindows();

        if(itr.hasNext())
        {
            for(Window w = itr.next(); itr.hasNext(); w = itr.next())
            {
                sx = w.getX();
                sy = w.getY();
                sw = w.getWidth();
                sh = w.getHeight();

                if(sx < x && x < sx + sw
                        && sy < y && y < sy + sh
                        && w.getScene() != exclude)
                    return w.getScene();
            }
        }
        return null;
    }

创建工具提示后,只需添加以下内容:

Tooltip tp = new Tooltip();
// use filter to catch before anything can be consumed
tp.addEventFilter(MouseEvent.ANY, E -> {
    // now correct the event
    correctNativeMouseEvent(E, tp.getScene());
    // although it is optionally, I would recommend to just consume the event anyways
    E.consume();
};