没有事件传递到 WPF 装饰层

发布于 2024-09-03 18:46:30 字数 882 浏览 8 评论 0原文

我正在尝试在 WPF 中创建一个漂亮的“拖放区域”，当将某些内容拖到主应用程序中时，该区域会显示在装饰器层中。问题是我没有从我的装饰器那里得到任何事件，尽管根据文档它应该接收所有输入事件，因为它处于更高的 z 顺序。

为了调试我的问题，我创建了一个非常简单的示例，其中我有一个只有一个按钮的用户控件。该用户控件显示在装饰层中，但我无法单击该按钮。为什么？我做错了什么？

我的装饰器类的构造如下：

    public ShellOverlayAdorner(UIElement element, AdornerLayer adornerLayer)
        :base(element)
    {
        _adornerLayer = adornerLayer;

        _overlayView = new AdornedElement();
        _overlayView.AllowDrop = true;
        _adornerLayer.Add(this);
     }

并在主窗口中创建，

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        adornerLayer = AdornerLayer.GetAdornerLayer(MyTopGridWithButtonInIt);
        ShellOverlayAdorner shell = new ShellOverlayAdorner(MyTopGridWithButtonInIt, adornerLayer);

    }

我根本没有从我的控件中获取任何事件，即没有鼠标单击、鼠标悬停、按钮单击。我什至无法单击装饰层中的按钮。我做错了什么？

原文

I am trying to make a nice "drag and drop zone" in WPF that is displayed in the adorner layer when something is being dragged into the main application. The problem is that I do not get any events from my adorner, even though it according to documentation should receive all input events since it is in a higher z-order.

To debug my problem I created a really simple example where I have a user control with only a button in it. This user control is displayed in the adorner layer, but I cannot click the button. Why? What have I done wrong?

My adorner class is constructed like this:

    public ShellOverlayAdorner(UIElement element, AdornerLayer adornerLayer)
        :base(element)
    {
        _adornerLayer = adornerLayer;

        _overlayView = new AdornedElement();
        _overlayView.AllowDrop = true;
        _adornerLayer.Add(this);
     }

and is created in the main window by

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        adornerLayer = AdornerLayer.GetAdornerLayer(MyTopGridWithButtonInIt);
        ShellOverlayAdorner shell = new ShellOverlayAdorner(MyTopGridWithButtonInIt, adornerLayer);

    }

I do not get any events at all from my control, i.e. no mouse clicks, mouse over, button clicks. I cannot even click the button in the adorner layer. What have I done wrong?

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≈。彩虹 2024-09-10 18:46:30

我不知道你是否已经尝试过：
如果您希望添加的元素对事件做出反应，我认为该元素必须绑定到装饰器的视觉树。
做到这一点的方法是使用一个 VisualCollection，对装饰器本身进行初始化，或者至少，这样它似乎可以工作：

    VisualCollection visualChildren;
    FrameworkElement @object;

    public CustomAdorner(UIElement adornedElement) :
        base(adornedElement)
    {
        visualChildren = new VisualCollection(this);
        @object = new Button {Content = "prova"};
        visualChildren.Add(@object);
    }
    protected override Visual GetVisualChild(int index)
    {
        return visualChildren[index];
    }

这样事件就可以正确路由。

I don't know if you already tried that:
If you want the element added to react to events, I think that the element must be bound to the visual tree of the adorner.
The way to do it is to use a VisualCollection, intitialized to the adorner itself, or at least, this way it seems to be working:

    VisualCollection visualChildren;
    FrameworkElement @object;

    public CustomAdorner(UIElement adornedElement) :
        base(adornedElement)
    {
        visualChildren = new VisualCollection(this);
        @object = new Button {Content = "prova"};
        visualChildren.Add(@object);
    }
    protected override Visual GetVisualChild(int index)
    {
        return visualChildren[index];
    }

This way the events are correctly routed.

回复收藏 0 原文

烟花肆意 2024-09-10 18:46:30

我刚刚遇到了同样的问题。按照 MSDN 的建议为我排序：

装饰器仅接收输入事件
与任何其他 FrameworkElement 一样。
因为装饰者总是有更高的
z 顺序比它装饰的元素，
装饰器接收输入事件
（例如 Drop 或 MouseMove）
用于底层装饰
元素。装饰者可以聆听
某些输入事件并将其传递
到底层的装饰元素
重新引发该事件。
启用直通命中测试
装饰器下的元素，设置命中
测试 IsHitTestVisible 属性
装饰器上为 false。

即在装饰器本身中，确保 IsHitTestVisible = false