基于计数在 WPF ListBox 中使用 DataTrigger 隐藏 ListBox 项中的按钮
Hide Button in ListBox Item using DataTrigger in WPF ListBox Based on Count
我有一个 ListBox
,因为 ItemTemplate
我有一个 TextBlock
和一个 Delete Button
。
我的需求:如果ObservableCollection<string> Person
只有一条记录,那么我需要隐藏删除Button
。如果有不止一条记录,那么我需要为所有项目显示删除 Button
。
XAML:
<ListBox ItemsSource="{Binding Person, UpdateSourceTrigger=PropertyChanged}" Background="Transparent" Margin="0 10" HorizontalContentAlignment="Stretch">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBox Grid.Row="0" Text="{Binding Contact, UpdateSourceTrigger=PropertyChanged}" />
<Button Grid.Row="1" Content="X" Foreground="Red" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.Style>
<Style TargetType="{x:Type ListBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Items.Count, RelativeSource={RelativeSource Self}}" Value="1">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</ListBox.Style>
</ListBox>
数据触发器:
<ListBox.Style>
<Style TargetType="{x:Type ListBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Items.Count, RelativeSource={RelativeSource Self}}" Value="1">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</ListBox.Style>
请帮助我如何根据我的要求设置 DataTrigger
。
DataTrigger 可以采用按钮的样式:
<Button ...>
<Button.Style>
<Style TargetType="Button">
<Style.Triggers>
<DataTrigger Binding="{Binding Items.Count,
RelativeSource={RelativeSource AncestorType=ListBox}}"
Value="1">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
我有一个 ListBox
,因为 ItemTemplate
我有一个 TextBlock
和一个 Delete Button
。
我的需求:如果ObservableCollection<string> Person
只有一条记录,那么我需要隐藏删除Button
。如果有不止一条记录,那么我需要为所有项目显示删除 Button
。
XAML:
<ListBox ItemsSource="{Binding Person, UpdateSourceTrigger=PropertyChanged}" Background="Transparent" Margin="0 10" HorizontalContentAlignment="Stretch">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBox Grid.Row="0" Text="{Binding Contact, UpdateSourceTrigger=PropertyChanged}" />
<Button Grid.Row="1" Content="X" Foreground="Red" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.Style>
<Style TargetType="{x:Type ListBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Items.Count, RelativeSource={RelativeSource Self}}" Value="1">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</ListBox.Style>
</ListBox>
数据触发器:
<ListBox.Style>
<Style TargetType="{x:Type ListBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Items.Count, RelativeSource={RelativeSource Self}}" Value="1">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</ListBox.Style>
请帮助我如何根据我的要求设置 DataTrigger
。
DataTrigger 可以采用按钮的样式:
<Button ...>
<Button.Style>
<Style TargetType="Button">
<Style.Triggers>
<DataTrigger Binding="{Binding Items.Count,
RelativeSource={RelativeSource AncestorType=ListBox}}"
Value="1">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>