我有一个带有 ItemsControl 的 WPF 视图,它绑定了 ViewModel 中的 ObservableCollection。现在我想慢慢淡出我从 ObservableCollection 中删除的项目。
视图模型:
public class ViewModel
{
public ObservableCollection<string> Items { get; set; }
}
看法:
<Window x:Class="Sandbox.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"
Name="mainWindow">
<Window.Resources>
<DataTemplate x:Key="mytemplate">
<DataTemplate.Resources>
<Storyboard x:Key="OnUnloaded">
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)" Storyboard.TargetName="grid">
<EasingDoubleKeyFrame KeyTime="0" Value="1"/>
<EasingDoubleKeyFrame KeyTime="0:0:0.3" Value="-0"/>
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.Y)" Storyboard.TargetName="grid">
<EasingDoubleKeyFrame KeyTime="0" Value="0"/>
<EasingDoubleKeyFrame KeyTime="0:0:0.3" Value="-10"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</DataTemplate.Resources>
<Grid x:Name="grid" RenderTransformOrigin="0.5,0.5">
<Grid.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</Grid.RenderTransform>
<TextBox Text="{Binding Mode=OneWay}"/>
</Grid>
<DataTemplate.Triggers>
<EventTrigger RoutedEvent="FrameworkElement.Unloaded">
<BeginStoryboard Storyboard="{StaticResource OnUnloaded}"/>
</EventTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</Window.Resources>
<StackPanel>
<ItemsControl Grid.Row="1" ItemsSource="{Binding Items}" ItemTemplate="{StaticResource mytemplate}"/>
</StackPanel>
我现在遇到的问题是,情节提要首先从集合中删除一个项目,但同时 itemscontrol 删除了该项目,为此,动画看不到......
知道如何防止在动画终止之前删除该项目吗?