在WPF中,有人为Grid制作动画吗？

Question

我在Grid中有2列.当我单击一个按钮时,我希望第一列从它的当前位置动画到左边的位置为0.所以,实际上,它会折叠,我只剩下查看一列.

Answer 1

不应该太难.您需要创建一个EventTrigger,它具有一个以网格为目标的BeginStoryboard,并使用DoubleAnimation缩小列宽. 这里的示例具有类似的设置. EventTrigger将继续按钮,DoubleAnimation的StoryBoard.Target将指向您希望缩小的ColumnDefinition.

好的,这样做不太好.您无法直接缩小列,但可以将收缩列设置为填充(width ="*"),设置Grid的宽度和非收缩列,然后缩小整个网格.这确实有效.以下示例有效:

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      WindowTitle="Opacity Animation Example" 
      Background="White">
   <StackPanel Margin="20">
      <Grid Name="MyGrid" Width="200" HorizontalAlignment="Left">
         <Grid.RowDefinitions>
            <RowDefinition Height="100"/>
         </Grid.RowDefinitions>
         <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="100"/>
         </Grid.ColumnDefinitions>
         <Rectangle HorizontalAlignment="Stretch"  
                    VerticalAlignment="Stretch" 
                    Grid.Column="0" Fill="Red"/>
         <Rectangle HorizontalAlignment="Stretch"  
                    VerticalAlignment="Stretch" 
                    Grid.Column="1" Fill="Blue"/>
      </Grid>

      <Button Name="hideButton">
         <Button.Triggers>
            <EventTrigger RoutedEvent="Button.Click">
               <BeginStoryboard>
                  <Storyboard>
                     <DoubleAnimation 
                         Storyboard.TargetName="MyGrid"
                         Storyboard.TargetProperty="(Grid.Width)" 
                         From="200" To="100" 
                         Duration="0:0:2" 
                         AutoReverse="True"  /> 
                  </Storyboard>
               </BeginStoryboard>
            </EventTrigger>
         </Button.Triggers>
      </Button>
   </StackPanel>
</Page>

Answer 2

您需要创建GridLengthAnimation类(代码来自:http://windowsclient.net/learn/video.aspx？v = 70654 )

public class GridLengthAnimation : AnimationTimeline
{
    public GridLengthAnimation()
    {
        // no-op
    }

    public GridLength From
    {
        get { return (GridLength)GetValue(FromProperty); }
        set { SetValue(FromProperty, value); }
    }

    public static readonly DependencyProperty FromProperty =
      DependencyProperty.Register("From", typeof(GridLength), typeof(GridLengthAnimation));

    public GridLength To
    {
        get { return (GridLength)GetValue(ToProperty); }
        set { SetValue(ToProperty, value); }
    }

    public static readonly DependencyProperty ToProperty =
        DependencyProperty.Register("To", typeof(GridLength), typeof(GridLengthAnimation));

    public override Type TargetPropertyType
    {
        get { return typeof(GridLength); }
    }

    protected override Freezable CreateInstanceCore()
    {
        return new GridLengthAnimation();
    }

    public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock)
    {
        double fromValue = this.From.Value;
        double toValue = this.To.Value;

        if (fromValue > toValue)
        {
            return new GridLength((1 - animationClock.CurrentProgress.Value) * (fromValue - toValue) + toValue, this.To.IsStar ? GridUnitType.Star : GridUnitType.Pixel);
        }
        else
        {
            return new GridLength((animationClock.CurrentProgress.Value) * (toValue - fromValue) + fromValue, this.To.IsStar ? GridUnitType.Star : GridUnitType.Pixel);
        }
    }
}

还有RowDefinition/ColumnDefinition的故事板.

<Window.Resources>
    <Storyboard x:Key="ColumnAnimation">
        <Animations:GridLengthAnimation
            BeginTime="0:0:0"
            Duration="0:0:0.1"
            From="0*"
            Storyboard.TargetName="ColumnToAnimate"
            Storyboard.TargetProperty="Width"
            To="10*" />
    </Storyboard>

</Window.Resources>

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="10*" />
        <ColumnDefinition Width="Auto" />
        <ColumnDefinition x:Name="ColumnToAnimate" Width="0*" />
    </Grid.ColumnDefinitions>
</Grid>