我有一个绑定到 CustomerViewModel 对象列表的 ListBox,每个都有两个依赖属性:
-名称(字符串)
-描述(字符串)
-IsVisible(布尔)
(IsVisible 属性默认为 True,可通过 CustomerViewModel 上的 ToggleVisibility 命令反转)
我想在边框控件的右侧显示名称和描述,即当 IsVisible 属性为 True 时具有透明背景,当为 False 时具有绿色背景。
我的问题是下面代码的 DataTrigger 部分不能按我想要的方式工作,因为当 IsVisible 更改时不会触发 Setter 部分。
我究竟做错了什么?
这是我的代码:
<UserControl.Resources>
<Style x:Key="ListBoxStyle" TargetType="{x:Type ListBox}">
<Setter Property="Margin" Value="-1,-1,0,0" />
<Setter Property="BorderThickness" Value="0" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="ItemContainerStyle" Value="{DynamicResource ListboxItemStyle}" />
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
</Style>
<Style x:Key="ListboxItemStyle" TargetType="{x:Type ListBoxItem}">
<Setter Property="Background" Value="Transparent" />
<Setter Property="FocusVisualStyle" Value="{x:Null}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Grid>
<Border x:Name="border" Background="{TemplateBinding Background}" BorderBrush="#FFD4D6D5" BorderThickness="0,0,0,1">
<Grid Height="70" Margin="0,0,10,0">
<Grid.RowDefinitions>
<RowDefinition Height="10" />
<RowDefinition Height="Auto" />
<RowDefinition />
<RowDefinition Height="10" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Border x:Name="visibilityColumn" Grid.Row="0" Grid.Column="0" Grid.RowSpan="4" Background="Transparent" Width="4" Margin="0,0,4,0" />
<TextBlock x:Name="customerName" Grid.Row="1" Grid.Column="1" Foreground="#FF191919" FontWeight="Bold" Text="{Binding Name}" VerticalAlignment="Top" />
<TextBlock Grid.Row="2" Grid.Column="1" VerticalAlignment="Stretch" Text="{Binding Description}" TextWrapping="Wrap" Foreground="#FFB4B4B4" TextTrimming="CharacterEllipsis" />
</Grid>
<Border.ContextMenu>
<ContextMenu>
<MenuItem Header="Edit..." />
<MenuItem Header="Visible" IsCheckable="True" IsChecked="{Binding IsVisible}" Command="{Binding ToggleVisibility}"/>
</ContextMenu>
</Border.ContextMenu>
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#FFEEEEEE" />
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="#FFF5F5F5" />
<Setter TargetName="customerName" Property="Foreground" Value="Green" />
</Trigger>
<DataTrigger Binding="{Binding IsVisible}" Value="False"> <!--If Value="True" the customerName Border shows up green!-->
<Setter Property="Background" Value="Green" />
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
<ListBox Style="{StaticResource ListBoxStyle}" ItemsSource="{Binding CustomerViewModels}" />
更新:
正如 Goblin 所指出的,DataTrigger 确实缺少 TargetName="visibilityColumn"。
然而 - “真正的”问题是,这一行:
<MenuItem Header="Visible" IsCheckable="True" IsChecked="{Binding IsVisible}" Command="{Binding ToggleVisibility}"/>
可检查的 MenuItem 在 IsChecked 属性上有一个 TwoWay 绑定模式,所以我实际上两次反转 IsVisiblity - 通过数据绑定和通过 ToggleVisibility 命令...哎呀 :)