EntranceThemeAnimation只是第一次出场 [英] EntranceThemeAnimation played only the first time

问题描述

我在C＃和Xaml开发Metro风格应用程序，其框架和页面用于导航。

Im'developing a Metro Style App in C# and Xaml with a Frame and pages for navigation.

In我的一个页面我有三个不同内容的网格; 我以这种方式向每个网格应用了一个EntranceThemeAnimation：

In one of my page I have three grids with different content; I applied to each grid an EntranceThemeAnimation in this way:

< Grid.Transitions>

    < TransitionCollection>

     < EntranceThemeTransition />

     < / TransitionCollection>

   < /Grid.Transitions>

<Grid.Transitions>
    <TransitionCollection>
     <EntranceThemeTransition />
    </TransitionCollection>
   </Grid.Transitions>

我的网格在页面启动时全部折叠，然后，根据用户的选择，我一次显示一个网格，通过视觉状态改变可见性。

但是，只有在第一次显示每个网格时才会播放EntranceAnimation。当我第二次改变视觉状态显示网格时，动画不再播放。

My grids are all collapsed at page startup and then, depending on user choice, I show a grid at a time changing visibility through visual states.
But the EntranceAnimation is played only the first time each grid is shown. When I show a grid the second time changing visual state, the animation is no more played.

每当我通过视觉显示改变其可见性的网格时，是否可以播放EntranceAnimation州？

Is it possibile to play an EntranceAnimation each time I show the gird changing its visibility through visual state?

推荐答案

我测试了这个似乎是入口主题将在控制树中添加一次。 我发现如果我从其父控件的children属性中删除有问题的网格，那么当我将其添加回来时，它将再次播放入口
主题。

I tested this and it seems that the entrance theme will play once upon addition to the control tree.  I found that if I remove the grid in question from the children property of its parent control, then when I add it back, it will play the entrance theme again.

Grid theGrid;
        public BlankPage()
        {
            this.InitializeComponent();
            theGrid = MyGrid;  // theGrid hold the Grid which has the transistion
            MyStackPanel.Children.Remove(MyGrid); // Remove it from the control tree upon start 
        }

        /// <summary>
        /// Invoked when this page is about to be displayed in a Frame.
        /// </summary>
        /// <param name="e">Event data that describes how this page was reached.  The Parameter
        /// property is typically used to configure the page.</param>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            MyStackPanel.Children.Insert(0, theGrid); // Add it before display
            theGrid.Visibility = Windows.UI.Xaml.Visibility.Visible;
        
        }

        private void Button_Click_2(object sender, RoutedEventArgs e)
        {
            MyGrid.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
            MyStackPanel.Children.Remove(theGrid); // Remove it upon collapse
      
        }

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