wpf 如何突出显示 ItemsControl 中的选定项目？
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How to highlight selected item in ItemsControl?
提问by Lucifer
I have the following XAML. How can i highlight the selected item in the ItemsControl ? I can override the selected item template for ListView but how to achieve the same for ItemsControl? Is there any alternative control that can display a collection of images ?
我有以下 XAML。如何突出显示 ItemsControl 中的选定项目？我可以覆盖 ListView 的选定项模板，但如何为 ItemsControl 实现相同的目标？是否有任何替代控件可以显示图像集合？
<Window x:Class="ImageScrollDemo.View.MoviePosterView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:ImageScrollDemo"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
Title="MoviePosterView" Height="367" Width="725" Foreground="White">
<Window.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="#FF505050" Offset="0"/>
<GradientStop Color="#FF202020" Offset="1"/>
</LinearGradientBrush>
</Window.Background>
<Window.DataContext>
<local:MainWindowViewModel />
</Window.DataContext>
<Window.Resources>
<local:MainWindowViewModel x:Key="ViewModel" />
<Style TargetType="Image" x:Key="ImageHover">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Opacity" Value="1" />
<Setter Property="BitmapEffect">
<Setter.Value>
<OuterGlowBitmapEffect GlowColor="Gold" GlowSize="8"/>
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="IsMouseOver" Value="False">
<Setter Property="Opacity" Value="0.7" />
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Loaded">
<i:InvokeCommandAction Command="{Binding PopulateMovieGrid}" />
</i:EventTrigger>
</i:Interaction.Triggers>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="60" />
</Grid.RowDefinitions>
<ScrollViewer ScrollViewer.VerticalScrollBarVisibility="Auto">
<ItemsControl Name="itemsCtrl" HorizontalContentAlignment="Center" ItemsSource="{Binding Path=MovieCollection, Mode=TwoWay}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid Columns="5" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemContainerStyle>
<Style TargetType="ContentPresenter">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Border BorderBrush="Black" BorderThickness="5">
<ContentPresenter Content="{Binding}"/>
</Border>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</ItemsControl.ItemContainerStyle>
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical" HorizontalAlignment="Center">
<Image Style="{StaticResource ImageHover}" Margin="0,5,0,0" RenderOptions.BitmapScalingMode="HighQuality" SnapsToDevicePixels="True" HorizontalAlignment="Center" Source="{Binding Path=Poster}" Height="150" />
<TextBlock Name="txtTitle" FontSize="10" HorizontalAlignment="Center" TextAlignment="Justify" Text="{Binding Title}" TextWrapping="Wrap" MaxWidth="110" />
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</Grid>
回答by Rachel
An ItemsControldoes not track the SelectedItem
一个ItemsControl不跟踪SelectedItem
If you want that behavior, I would suggest overwriting the styles and templates for a ListBox
如果您想要这种行为，我建议您覆盖样式和模板 ListBox
<ListBox Name="itemsCtrl" HorizontalContentAlignment="Center" ItemsSource="{Binding Path=MovieCollection, Mode=TwoWay}">
<ListBox.Resources>
<!-- Set SelectedItem Background here -->
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Yellow"/>
</ListBox.Resources>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid Columns="5" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical" HorizontalAlignment="Center">
<Image Style="{StaticResource ImageHover}" Margin="0,5,0,0" RenderOptions.BitmapScalingMode="HighQuality" SnapsToDevicePixels="True" HorizontalAlignment="Center" Source="{Binding Path=Poster}" Height="150" />
<TextBlock Name="txtTitle" FontSize="10" HorizontalAlignment="Center" TextAlignment="Justify" Text="{Binding Title}" TextWrapping="Wrap" MaxWidth="110" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
回答by OliverAssad
you can also do this through the expression blend interactivity. Use the event name MouseLeftDown or Tapped Event (in Windows 8.1) in the ItemsTemplate in the top container (StackPanel or the grid).
您也可以通过表达式混合交互性来做到这一点。在顶部容器（StackPanel 或网格）的 ItemsTemplate 中使用事件名称 MouseLeftDown 或 Tapped Event（在 Windows 8.1 中）。
xmlns:Core="using:Microsoft.Xaml.Interactions.Core"
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseLeftDown">
<Core:ChangePropertyAction PropertyName="Background" Value="Green"/>
</i:EventTrigger>
</i:Interaction.Triggers>
This should do the trick
这应该可以解决问题
