在VisualStateManager(WinRT XAML)中更改ItemTemplate中控件的属性

Question

我有我用于SnapView和Portrait视图的ListView.但是,我想在这两个视图中更改项目模板的某些项目.VisualStateManager似乎是理想的做法,但我无法弄清楚.

这是我的ListView XAML:

<ListView x:Name="SampleListView" ItemsSource="{Binding Samples}" Visibility="Collapsed">
    <ListView.ItemTemplate>
        <DataTemplate>
            <local:SampleBlock SampleText="{Binding ElementName=pageRoot, Path=DataContext.SampleText, Mode=TwoWay}"
                Height="70" Width="Auto" Margin="5" />
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

我想使用页面的VisualStateManager 更改我的SampleBlock控件的高度和边距.这是我的可视状态管理器,它显示和隐藏我的ListView:

<VisualState x:Name="FullScreenPortrait">
    <Storyboard>
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SampleListView" Storyboard.TargetProperty="Visibility">
            <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
        </ObjectAnimationUsingKeyFrames>
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SampleGridView" Storyboard.TargetProperty="Visibility">
            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
        </ObjectAnimationUsingKeyFrames>
    </Storyboard>
</VisualState>

<VisualState x:Name="Snapped">
    <Storyboard>
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SampleListView" Storyboard.TargetProperty="Visibility">
            <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
        </ObjectAnimationUsingKeyFrames>
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SampleGridView" Storyboard.TargetProperty="Visibility">
            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
        </ObjectAnimationUsingKeyFrames>
    </Storyboard>
</VisualState>

有没有办法从页面的VisualStateManager访问项目模板,或者我应该从不同的角度攻击这个？

Answer 1

您无法更改DataTemplate的属性,但可以将ListView的实际ItemTemplate更改为用于捕捉视图的特定模板

<VisualState x:Name="Snapped">
    <Storyboard>
        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="itemListView" Storyboard.TargetProperty="ItemTemplate">
            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedListViewItemTemplate}"/>
        </ObjectAnimationUsingKeyFrames>                        
    </Storyboard>
</VisualState>