我有列表框:
<ListBox x:Name="ListBoxImages"
ScrollViewer.CanContentScroll="True"
UseLayoutRounding="False"
SelectionMode="Extended"/>
列表框样式:
<Style TargetType="{x:Type ListBox}">
...
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBox">
<Border Name="Border">
<ScrollViewer Focusable="false">
<WrapPanel ItemWidth="100"
IsItemsHost="True"/>
</ScrollViewer>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
和 ListBoxItem 样式(这里是动画,抱歉长代码):
<Style TargetType="{x:Type ListBoxItem}">
<!--...-->
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border x:Name="border"
RenderTransformOrigin="0.5,0.5">
<Border.RenderTransform>
<TransformGroup>
<ScaleTransform x:Name="ScaleTransform"/>
</TransformGroup>
</Border.RenderTransform>
<ContentPresenter/>
</Border>
<!--Animation-->
<EventTrigger RoutedEvent="FrameworkElement.Loaded">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetName="ScaleTransform"
Storyboard.TargetProperty="ScaleX"
Duration="0:0:0.1"
From="0" To="1"/>
<DoubleAnimation Storyboard.TargetName="ScaleTransform"
Storyboard.TargetProperty="ScaleY"
Duration="0:0:0.1"
From="0" To="1"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="FrameworkElement.Unloaded">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetName="ScaleTransform"
Storyboard.TargetProperty="ScaleX"
Duration="0:0:0.1"
To="0"/>
<DoubleAnimation Storyboard.TargetName="ScaleTransform"
Storyboard.TargetProperty="ScaleY"
Duration="0:0:0.1"
To="0"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
问题。添加元素(FrameworkElement.Loaded)时的动画并不总是播放。这种感觉是在创建项目时播放,但尚未显示。删除项目时的动画(FrameworkElement.Unloaded)不播放。那么,如何解决呢?