PreviewMouseDoubleClic 已忽略处理

发布于 2024-10-17 18:51:22 字数 816 浏览 10 评论 0原文

我有一个包含文本框的窗口。

在窗口和文本框中，我添加了一个 PreviewMouseDoubleClicHandler。

窗口中的处理程序：

private void PreviewMouseDoubleClickHandler(object sender, MouseButtonEventArgs e)
{
    Debug.WriteLine("handler in the window");
    e.Handled = true;
}

文本框中的处理程序：

private void PreviewMouseDoubleClickHandler(object sender, MouseButtonEventArgs e)
{
    Debug.WriteLine("handler in the textBox");
    e.Handled = true;
}

现在，当我双击文本框时，我希望首先进入窗口的处理程序，打印调试行，然后处理事件，然后仅此而已。我认为文本框的处理程序不会触发，因为该事件已经由窗口处理。

但这并不是这样工作的：我的两个处理程序都被解雇了。

奇怪的是：它与 PreviewMouseDown 事件配合得很好。如果我做完全相同的事情，但使用 PreviewMouseDownEvents，我会得到我期望的行为，即：窗口处理 mouseDown 并且不触发 textBox 的处理程序。

那么为什么这不适用于 doubleClick 事件呢？我做错了什么吗？它应该像这样工作吗？ doubleClick 事件是否以不同的方式管理，导致我无法利用隧道的优势？

原文

I have a window containing a textBox.

On both the window AND the textBox, I add a PreviewMouseDoubleClicHandler.

Handler in the window:

private void PreviewMouseDoubleClickHandler(object sender, MouseButtonEventArgs e)
{
    Debug.WriteLine("handler in the window");
    e.Handled = true;
}

handler in the textBox:

private void PreviewMouseDoubleClickHandler(object sender, MouseButtonEventArgs e)
{
    Debug.WriteLine("handler in the textBox");
    e.Handled = true;
}

now, when I double-click on the textBox, I expect to go first into the window's Handler, print the debug line, then handle the event, then nothing more. I thought the textBox's handler would not fire since the event has already been handled by the window.

This does not work like this though: I get both handlers fired.

The weird thing is: It works fine with the PreviewMouseDown event. If I do exactly the same thing but with PreviewMouseDownEvents, I get the behavior I expect, i.e.: the window handles the mouseDown and the textBox's handler is not fired.

so Why does this not work with the doubleClick event? Am I doing something wrong? Is it supposed to work like this? is the doubleClick Event managed in a different way that prevents me from using the advantages of tunneling?

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