WPF 如何创建自定义tunelroutedevent？

发布于 2024-08-02 15:38:15 字数 369 浏览 7 评论 0原文

我需要一个从父控件到子控件的隧道路由事件隧道的简单示例。

（这不是真实代码）——事实上，我越深入，我就越认为 XAML 是错误的——可能不应该在子节点上的 XAML 中注册隧道事件（不确定？）

<PARENT>    
   <MyControl DoSomethingOnUserAction="raiseTunnelEvent"> HELP </MyControl >    
   <CHILD> I SHOULD HANDLE tunnelled event </CHILD> 
</PARENT>

简单、简洁的例子会很有帮助。

谢谢，艾伦

原文

I need a simple example of a Tunnel Routed Event tunnelling from a parent control to a child control.

(THIS IS NOT REAL CODE) -- in fact, the deeper I go, the more I think that the XAML is wrong -- probably should NOT sign up for the tunnelled event in XAML on the child node (not sure?)

<PARENT>    
   <MyControl DoSomethingOnUserAction="raiseTunnelEvent"> HELP </MyControl >    
   <CHILD> I SHOULD HANDLE tunnelled event </CHILD> 
</PARENT>

Simple, concise example would be helpful.

Thanks,
Alan

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风和你 2024-08-09 15:38:15

不确定，但你可能想要一只猫吠叫。

Button 的 RoutedEvent ClickEvent（来自PresentationFramework）声明为：

public static readonly RoutedEvent ClickEvent = 
    EventManager.RegisterRoutedEvent("Click", 
    RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof
    (ButtonBase));

请注意Bubble 的readonly RoutingStrategy。

以下内容可能有助于理解隧道、气泡和直接：
msdn.microsoft.com/en-us/library/system.windows.routingstrategy.aspx

这应该会引导您完成剩下的工作：
msdn.microsoft.com/en-us/magazine/cc785480.aspx

提示：按照惯例，WPF 中的隧道事件以“Preview”开头（例如“PreviewExplode”）。如果事件不以“Preview”开头，则可能不会不要使用隧道 RoutingStrategy。此外，您通常会看到隧道和气泡配对，隧道首先触发，然后是气泡，如“PreviewExplode”，然后是“Explode”。

如果您需要按钮的单击隧道，您可以考虑

使用。 PreviewMouseDown（当然不一样，并且可能很危险，因为并非所有鼠标按下都意味着单击）。
编写一个引发 PreviewClick 和 Click 的 TunnelButton。

Not sure, but you may be wanting a cat to bark.

The RoutedEvent ClickEvent of Button (from PresentationFramework) is declared as:

public static readonly RoutedEvent ClickEvent = 
    EventManager.RegisterRoutedEvent("Click", 
    RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof
    (ButtonBase));

Note the readonly RoutingStrategy of Bubble.

The following may help with understanding Tunnel, Bubble, and Direct:
msdn.microsoft.com/en-us/library/system.windows.routingstrategy.aspx

And this should take you the rest of the way:
msdn.microsoft.com/en-us/magazine/cc785480.aspx

A tip: by convention tunneling events in WPF begin with "Preview" (e.g.- "PreviewExplode". If the event doesn't begin with "Preview" it probably doesn't use the tunnel RoutingStrategy. Also you will usually see a Tunnel and Bubble paired with the Tunnel firing first then the Bubble as in "PreviewExplode" followed by "Explode".

If you need to have a Button's Click tunnel, you might consider

using PreviewMouseDown (not the same of course and likely dangerous since not all mouse-downs are meant to become clicks).
Writing a TunnelButton that raises a PreviewClick and then a Click.

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