我有一个 ItemsControl 和一个绑定到数据项的 ItemTemplate。ItemTemplate 相当复杂,我添加了一些视觉状态,以便我可以更改它的外观。
我希望能够在 ItemsControl 之外发生的事件上将所有项目 VisualState 切换到我选择的另一个状态。
我该怎么做呢?我试过使用 VisualStateManager.SetState,但这依赖于一个控件,而不是一个模板,这似乎是我可以通过 WaveItems.ItemContainerGenerator.ContainerFromIndex(i) 获得的全部。
问候
特里斯坦
编辑:
这是我的各个项目的数据模板。如果您注意到我设置的触发器,它会处理模板本身的 MouseEnter / MouseLeave。我想将这些连接到 ItemsControl MouseEnter / MouseLeave,而无需编写任何代码。有没有办法做到这一点?
<DataTemplate x:Key="LineTemplate">
<Grid x:Name="LineGrid" HorizontalAlignment="Left" Height="500" VerticalAlignment="Center" Width="3">
<VisualStateManager.CustomVisualStateManager>
<ei:ExtendedVisualStateManager/>
</VisualStateManager.CustomVisualStateManager>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="VisualStateGroup">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Expanded">
<Storyboard>
<DoubleAnimation Duration="0:0:1" By="-100" Storyboard.TargetProperty="(Line.Y2)" Storyboard.TargetName="lineTop"/>
<DoubleAnimation Duration="0:0:1" By="100" Storyboard.TargetProperty="(Line.Y2)" Storyboard.TargetName="lineBottom"/>
<DoubleAnimation Duration="0:0:1" To="0.5" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="lineTop" d:IsOptimized="True"/>
<DoubleAnimation Duration="0:0:1" To="0.25" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="lineBottom" d:IsOptimized="True"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Normal">
<Storyboard>
<DoubleAnimation Duration="0:0:1" To="0" Storyboard.TargetProperty="(Line.Y2)" Storyboard.TargetName="lineTop" d:IsOptimized="True"/>
<DoubleAnimation Duration="0:0:1" To="{Binding BottomValue}" Storyboard.TargetProperty="(Line.Y2)" Storyboard.TargetName="lineBottom" d:IsOptimized="True"/>
<DoubleAnimation Duration="0:0:1" To="1" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="lineTop" d:IsOptimized="True"/>
<DoubleAnimation Duration="0:0:1" To="0.495" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="lineBottom" d:IsOptimized="True"/>
</Storyboard>
</VisualState>
<VisualState x:Name="ExpandedHighlight"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseEnter" >
<ei:GoToStateAction x:Name="Expand" StateName="Expanded"/>
</i:EventTrigger>
<i:EventTrigger EventName="MouseLeave">
<ei:GoToStateAction x:Name="Collapse" StateName="Normal"/>
</i:EventTrigger>
</i:Interaction.Triggers>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Line Grid.Row="0" x:Name="lineTop" VerticalAlignment="Bottom" StrokeThickness="3" Stroke="{Binding Brush}" Y1="{Binding TopValue}" Y2="0" RenderTransformOrigin="0.5,0.5">
<Line.RenderTransform>
<CompositeTransform ScaleY="1"/>
</Line.RenderTransform>
</Line>
<Line Grid.Row="1" x:Name="lineBottom" VerticalAlignment="Top" StrokeThickness="3" Stroke="{Binding Brush}" Y1="0" Y2="{Binding BottomValue}" RenderTransformOrigin="0.5,0.5" Opacity="0.5">
<Line.RenderTransform>
<CompositeTransform ScaleY="1"/>
</Line.RenderTransform>
</Line>
</Grid>
</DataTemplate>
我还尝试使用以下绑定: SourceObject="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}}"
但这会显示一条消息:“silverlight 项目中不支持类型”。