在 OnNavigatingFrom 上取消导航时停止 wp7 的过渡 [英] stop wp7 out transitions while canceling navigation on OnNavigatingFrom

问题描述

在我的应用程序的某些情况下，我必须取消后退导航.我是用代码做的:

In some case in my application, I have to cancel back navigation. I'm doing it with code:

    protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
    {
        if (e.NavigationMode == NavigationMode.Back)
        {
            if (WaitPanelGrid.Visibility == System.Windows.Visibility.Visible)
            {
                e.Cancel = true;
            }
        }
        base.OnNavigatingFrom(e);
    }

一切都好，除了一件事:在这个页面我有过渡:

And everything is OK, except one thing: In this page i have transitions:

<toolkit:TransitionService.NavigationInTransition>
    <toolkit:NavigationInTransition>
        <toolkit:NavigationInTransition.Backward>
            <toolkit:TurnstileTransition Mode="BackwardIn" />
        </toolkit:NavigationInTransition.Backward>
        <toolkit:NavigationInTransition.Forward>
            <toolkit:TurnstileTransition Mode="ForwardIn" />
        </toolkit:NavigationInTransition.Forward>
    </toolkit:NavigationInTransition>
</toolkit:TransitionService.NavigationInTransition>
<toolkit:TransitionService.NavigationOutTransition>
    <toolkit:NavigationOutTransition>
        <toolkit:NavigationOutTransition.Backward>
            <toolkit:TurnstileTransition Mode="BackwardOut" />
        </toolkit:NavigationOutTransition.Backward>
        <toolkit:NavigationOutTransition.Forward>
            <toolkit:TurnstileTransition Mode="ForwardOut" />
        </toolkit:NavigationOutTransition.Forward>
    </toolkit:NavigationOutTransition>
</toolkit:TransitionService.NavigationOutTransition>

并在 OnNavigatingFrom 中调用 Cancel 停止应用程序从导航返回，但过渡仍在工作，所以最后我只有黑屏，因为页面没有改变，但它被动画并移动到屏幕后面的某个地方.

And calling Cancel in OnNavigatingFrom stop application from navigate back, but transition is still working, so in the end i have just black screen, because page was not changed, but it was animated and moved somewhere behind screen.

我的问题是:如何取消导航和转换?

My question is: How I can cancel navigating AND transition?

推荐答案

摘自 这篇文章

如果您想禁用页面的导航转换，请在页面上将 TransitionService.NavigationInTransition 和 TransitionService.NavigationOutTransition 设置为 null.如果您想恢复这些值，只需预先存储它们，然后再次设置它们.

If you want to disable navigation transitions for a Page, set TransitionService.NavigationInTransition and TransitionService.NavigationOutTransition to null on the Page. If you want to restore those values, just store them beforehand and then set them again.

PhoneApplicationFrame frame = (PhoneApplicationFrame)Application.Current.RootVisual;

PhoneApplicationPage page = (PhoneApplicationPage)frame.Content;

// Save the transitions

NavigationInTransition oldIn = TransitionService.GetNavigationInTransition(page);

NavigationOutTransition oldOut = TransitionService.GetNavigationOutTransition(page);

// Clear the transitions

TransitionService.SetNavigationInTransition(page, null);

TransitionService.SetNavigationOutTransition(page, null);

// Restore the transitions

TransitionService.SetNavigationInTransition(page, oldIn);

TransitionService.SetNavigationOutTransition(page, oldOut);

这篇关于在 OnNavigatingFrom 上取消导航时停止 wp7 的过渡的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！