我有一个被声明为以下方式的ListView:
<ListView x:Name="Tree"
ItemsSource="{Binding ElementName=This, Path=Some.Path.Values}"
AlternationCount="2"
ScrollViewer.CanContentScroll="False">
并且有一种被定义为
<UserControl.Resources>
<Style TargetType="ListViewItem">
<Style.Resources>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="SteelBlue"/>
<SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Gray"/>
</Style.Resources>
<Style.Triggers>
<Trigger Property="ItemsControl.AlternationIndex" Value="0">
<Setter Property="Background" Value="White" />
</Trigger>
<Trigger Property="ItemsControl.AlternationIndex" Value="1">
<Setter Property="Background" Value="GhostWhite" />
</Trigger>
</Style.Triggers>
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<Setter Property="VerticalContentAlignment" Value="Top" />
<EventSetter Event="Loaded" Handler="ContinueLoading" />
</Style>
这种组合产生了最初期望的交替背景高亮行为。新的期望是根据给定ListView项目属性的值更改背景颜色;因此,
Style.Triggers
被更改为:<Style.Triggers>
<Trigger Property="ItemsControl.AlternationIndex" Value="0">
<Setter Property="Background" Value="White" />
</Trigger>
<Trigger Property="ItemsControl.AlternationIndex" Value="1">
<Setter Property="Background" Value="GhostWhite" />
</Trigger>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}}, Path=(ItemsControl.AlternationIndex)}" Value="0"/>
<Condition Binding="{Binding Converter={x:Static controls:Converters.ObjectType}}" Value="{x:Type client:DocumentEntryTypeA}" />
</MultiDataTrigger.Conditions>
<Setter Property="Background" Value="{Binding Converter={x:Static controls:Converters.LightColor}, UpdateSourceTrigger=PropertyChanged, Path=Status}" />
</MultiDataTrigger>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}}, Path=(ItemsControl.AlternationIndex)}" Value="1"/>
<Condition Binding="{Binding Converter={x:Static controls:Converters.ObjectType}}" Value="{x:Type client:DocumentEntryTypeA}" />
</MultiDataTrigger.Conditions>
<Setter Property="Background" Value="{Binding Converter={x:Static controls:Converters.DarkColor}, UpdateSourceTrigger=PropertyChanged, Path=Status}" />
</MultiDataTrigger>
</Style.Triggers>
</UserControl.Resources>
ObjectType
转换器检查元素是否属于给定的类;LightColor
和DarkColor
转换器根据Status
属性的值产生所选的背景值。
这段代码的问题在于我使用的绑定似乎总是生成一个'0'的AlternationIndex
值,即每个条目都使用了LightColor转换器。除了上述代码,我还尝试了相同结果的以下绑定:
<Condition Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ItemsControl}, Path=AlternationIndex}" Value="0"/>
<Condition Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type ListView}}, Path=(ItemsControl.AlternationIndex)}" Value="0"/>
根据我所见的例子,大多数解决方案没有将样式与对象分离;在我的情况下,样式是在UserControl.Resources
中单独定义的。但是,由于使用触发器可以正常工作,我不确定为什么数据触发器不起作用,或者需要什么才能使其工作。