故事板针对WP8的GridLength

时间:2014-06-27 08:43:00

标签: c# windows-phone-8 storyboard gridlength rowdefinition

我想为RowDefinition制作一个改变高度的故事板,我发现this可以帮助我。当我想创建类 GridLengthAnimation 时唯一的问题,我不能使它成为AnimationTimeline。这是因为Windows Phone 8不支持这个吗?

在这种情况下,还有另一种方法可以为RowDefinition制作故事板吗?

1 个答案:

答案 0 :(得分:1)

最简单的方法可能是将网格放到行中,并像这样设置它们的高度属性。

这是xaml:

<Grid x:Name="LayoutRoot">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>

    <Grid Background="AliceBlue"
          Grid.Row="0"
          Height="100"
          Tap="Grid_Tap"
          CacheMode="BitmapCache" />
    <Grid Background="AntiqueWhite"
          Grid.Row="1"
          Height="100"
          Tap="Grid_Tap"
          CacheMode="BitmapCache" />
    <Grid Background="Aqua"
          Grid.Row="2"
          Height="100"
          Tap="Grid_Tap"
          CacheMode="BitmapCache" />
    <Grid Background="Aquamarine"
          Grid.Row="3"
          Height="100"
          Tap="Grid_Tap"
          CacheMode="BitmapCache" />

</Grid>

和cs:

private void AnimateHeight(Grid grid)
{
    double newHeight = grid.ActualHeight == 100 ? 300 : 100; //select the height we want to animate

    Storyboard story = new Storyboard();
    DoubleAnimation animation = new DoubleAnimation();
    animation.To = newHeight;
    animation.Duration = TimeSpan.FromSeconds(0.5);

    Storyboard.SetTarget(animation, grid);
    Storyboard.SetTargetProperty(animation, new PropertyPath(Grid.HeightProperty));

    story.Children.Add(animation);
    story.Begin();
}

private void Grid_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
    Grid grid = sender as Grid; //select the grid we tapped
    AnimateHeight(grid);
}

请注意,我将cachemode推送到bitmapcache所有网格。这不是必需的,但会提供更流畅的动画,因为静态网格不会在每个帧中重新绘制。