在WP8应用程序栏被隐藏后做一些事情

Question

我正在为应用程序栏图标按钮实现我自己的弹出菜单(类似于PhoneFlipMenu工具)。我使用垂直StackPanel为我的弹出，我需要显示它与动画时，相应的应用程序栏按钮被点击。代码看起来像这样:

private void appBarIconButtonList_Click(object sender, EventArgs e)
{
    ApplicationBar.IsVisible = false;
    AnimatePopupMenuListCommands(true);
}
private void AnimatePopupMenuListCommands(bool openMenu)
{
    PlaneProjection planeProjection = popupMenuListCommands.Projection as PlaneProjection;
    DoubleAnimation anima = new DoubleAnimation();
    if (openMenu)
    {
        anima.From = 90;
        anima.To = 0;
    }
    else
    {
        anima.From = 0;
        anima.To = 90;
    }
    anima.Duration = new Duration(TimeSpan.FromSeconds(0.1));
    Storyboard.SetTarget(anima, planeProjection);
    Storyboard.SetTargetProperty(anima, new PropertyPath(PlaneProjection.RotationXProperty));
    Storyboard storyboard = new Storyboard();
    storyboard.Children.Add(anima);
    storyboard.Begin();
}

主要的问题是动画在应用程序栏隐藏之前就开始了。因此，弹出式菜单在那之后稍微跳了一下。如何运行动画后，应用程序栏已完全隐藏?

Answer 1

尝试在动画完成后隐藏应用程序栏。

 storyboard.Completed += storyboard_Completed;

    void storyboard_Completed(object sender, EventArgs e)
    {
        ApplicationBar.IsVisible = false;
    }

Answer 2

您可以使用Dispatcher或DispatcherTimer等待appbar被隐藏。下面是一个使用Dispatcher的示例:

private void ApplicationBarIconButton_OnClick(object sender, EventArgs e)
{
    ApplicationBar.IsVisible = false;
    WaitForAppBarThenShowMenu();
}
private void WaitForAppBarThenShowMenu()
{
    if (ApplicationBar.IsVisible)
    {
        Dispatcher.BeginInvoke(WaitForAppBarThenShowMenu);
    }
    else
    {
        AnimatePopupMenuListCommands();
    }
}

旧答案-不工作我相信你可以订阅ApplicationBar的statechange事件，然后开始你的故事。

EventHandler<ApplicationBarStateChangedEventArgs> stateChanged = null;
stateChanged = (s,e) => 
{
    ApplicationBar.StateChanged -= stateChanged;
    AnimatePopupMenuListCommands(true);
};
ApplicationBar.StateChanged += stateChanged;
ApplicationBar.IsVisible = false;