c# - WPF Listbox 控件模板不显示 Listboxitem 控件模板和 ItemTemplate 数据模板
问题描述
当我在 ListBox 控件模板中使用 ItemsControl 时,不会应用我的 ListBoxItem 控件模板。
我有一个自定义 ListBox 控件模板以及一个包裹在样式中的 ListBoxItem 控件模板。在我的主窗口中,我有一个带有数据模板的 ListBox 声明。
控制模板:
<Style TargetType="ListBoxItem" BasedOn="{StaticResource Base_Control_Style}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border x:Name="border" BorderThickness="0"
BorderBrush="Transparent" Background="Transparent">
<ContentPresenter Content="{TemplateBinding Content}" Margin="2"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter TargetName="border" Property="Background"
Value="{StaticResource Base_PrimaryLight}"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True" >
<Setter TargetName="border" Property="Background"
Value="{StaticResource Base_Secondary}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="True"/>
<Condition Property="IsSelected" Value="True"/>
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter TargetName="border" Property="Background"
Value="{StaticResource Base_SecondaryDark}"/>
</MultiTrigger.Setters>
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="ListBox" BasedOn="{StaticResource Base_Control_Style}">
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Background" Value="{StaticResource Base_PrimaryDark}"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto" />
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBox">
<Border x:Name="Border" BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}">
<ScrollViewer Margin="2">
<!--<StackPanel IsItemsHost="true"/>-->
<!--<ItemsPresenter/>-->
<ItemsControl ItemsSource="{TemplateBinding ItemsSource}"
ItemTemplate="{TemplateBinding ItemTemplate}"/>
</ScrollViewer>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
列表框声明:
<ListBox x:Name="recipients_listbox" Margin="10" ItemsSource="{Binding Path=Recipients}"
SelectedValuePath="Email"
SnapsToDevicePixels="True"
HorizontalContentAlignment="Stretch" ScrollViewer.CanContentScroll="False">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Margin="2,4" HorizontalAlignment="Stretch" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="60"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="50"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.Resources>
<Style TargetType="TextBlock">
<Setter Property="Foreground" Value="Black"/>
</Style>
</Grid.Resources>
<Image Source="{Binding ImagePath}"
RenderOptions.BitmapScalingMode="HighQuality"
SnapsToDevicePixels="True"
Grid.Column="0" Grid.Row="0" Grid.RowSpan="3"
Stretch="UniformToFill" Margin="0,0,10,0"/>
<TextBlock Text="Name:" FontWeight="Bold"
Grid.Column="1" Grid.Row="0" VerticalAlignment="Center"/>
<TextBlock Text="Email:" FontWeight="Bold"
Grid.Column="1" Grid.Row="1" VerticalAlignment="Center"/>
<TextBlock Text="Department:" FontWeight="Bold"
Grid.Column="1" Grid.Row="2" VerticalAlignment="Center"/>
<TextBlock VerticalAlignment="Center" Grid.Column="3" Grid.Row="0">
<Run Text="{Binding FirstName}"/>
<Run Text="{Binding LastName}"/>
</TextBlock>
<TextBlock Text="{Binding Email}"
VerticalAlignment="Center" Grid.Column="3" Grid.Row="1"/>
<TextBlock Text="{Binding Department}"
VerticalAlignment="Center" Grid.Column="3" Grid.Row="2"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
问题是当我在我的 ListBox 控件模板中使用 ItemsControl 时,我的 ListBoxItem 控件模板没有应用(更改背景颜色的触发器不会激活),而我的数据模板是。
带有 ItemsControl 的列表框
我尝试使用带有 isItemsHost=True 的 StackPanel 以及 ItemsPresenter。这两个选项都应用了我的 ListBoxItem 控件模板,但没有应用我的数据模板。
带有 StackPanel 或 ItemsPresenter 的列表框
有什么方法可以同时应用我的 ListBoxItem 控件模板和数据模板?
解决方案
ListBoxItem Style 中的 ControlTemplate 中的 ContentPresenter 不使用该ContentTemplate
属性,该属性包含 ListBox 属性的 DataTemplate ItemTemplate
。
添加适当的 TemplateBinding:
<Style TargetType="ListBoxItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<Border ...>
<ContentPresenter Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
Margin="2"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
...
</Style>
然后要么在 ListBox 的 ControlTemplate 中使用 ItemsPresenter,要么根本不设置Template
属性:
<Style TargetType="ListBox">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBox">
<Border BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush="{TemplateBinding BorderBrush}"
Background="{TemplateBinding Background}">
<ScrollViewer Margin="2">
<ItemsPresenter/>
</ScrollViewer>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
...
</Style>