wpf 添加了新项目上的列表框滑动动画
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ListBox Slide Animation On New Item Added
提问by TrialAndError
I am working on a news feed. This will update every so often and if new items are found, I want to slide in the new content from the top.
我正在处理新闻提要。这会经常更新，如果发现新项目，我想从顶部滑入新内容。
Right now, I am just having it fade in by doing the following:
现在，我只是通过执行以下操作让它淡入淡出：
<ListBox Grid.Row="0" Height="Auto" HorizontalAlignment="Stretch" Margin="5,5,5,5" VerticalAlignment="Top" ItemsSource="{Binding NewsItems,UpdateSourceTrigger=PropertyChanged}" >
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Style.Triggers>
<EventTrigger RoutedEvent="Loaded">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="Opacity" From="0" To="1" Duration="0:0:2" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
....
</ListBox>
This works fine, but I would really like to have the item slide in. I have tried every possible thing I could find and cannot get anywhere. Any help would be much appreciated.
这工作正常，但我真的很想让项目滑入。我已经尝试了我能找到的所有可能的东西，但无法到达任何地方。任何帮助将非常感激。
回答by user195275
Is this what you're looking for?
这是你要找的吗？
<ListBox x:Name="lstBox" Grid.Row="0" Height="Auto" HorizontalAlignment="Stretch" Margin="5,5,5,5" VerticalAlignment="Top" ItemsSource="{Binding NewsItems,UpdateSourceTrigger=PropertyChanged}" >
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="LayoutTransform">
<Setter.Value>
<ScaleTransform x:Name="transform" />
</Setter.Value>
</Setter>
<Style.Triggers>
<EventTrigger RoutedEvent="Loaded">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="Opacity" From="0" To="1" Duration="0:0:2" />
<DoubleAnimation Storyboard.TargetProperty="LayoutTransform.ScaleY" From="0" Duration="0:0:.2"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
