UWP/WinRT:检测何时关闭弹出窗口 [英] UWP / WinRT: Detect when a popup is about to be closed

问题描述

如何检测弹出窗口何时要关闭?

How can I detect when a popup is about to be closed?

与WPF中存在此类事件的WPF不同，UWP中Popup类没有Closing事件.

The Popup class does not have a Closing event in UWP, unlike in WPF where such an event exists.

我需要它来保持弹出窗口的状态，因为布局可以由用户修改.

I need this in order to persist the state of the Popup because the layout can be modified by the user.

推荐答案

您已经知道，没有关闭事件.通过注册IsOpen属性更改(如果IsLightDismissEnabled属性设置为true ...)，您可能会很幸运

As you already know, there is no Closing event. You might get lucky by registering to IsOpen property change (if IsLightDismissEnabled property is set to true...)

this.popup.RegisterPropertyChangedCallback(Popup.IsOpenProperty, (d, e) =>
{
    if (!this.popup.IsOpen)
    {
        // do something, popup is closing?
    }
});

因为发生在LostFocus和Closed事件被触发之前.除此之外，如果不是为了避免依赖于关闭事件而变得很复杂的话，还可以重新设计持久数据的方式以始终保持它们.

because that happens before the LostFocus and Closed events get fired. Other than that, you can redesign the way you persist data to persist them all the time if it's not something very complex to avoid having to depend on the closing event.

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