为了显示 WPF 列表框,我使用用户控件 (MessageRowTemplate) 作为列表框项。用户控制使用值转换器 (MessageTypeToBrushConverter)。出于某种原因,只有当用户控件不用作列表框项而是单独使用时,才会触发值转换器。
带有用户控件的 xaml 文件单独使用并在列表框中作为列表框项:
<local:MuuriWindow x:Class="Muuri_UI_WPFv3.Window_Conversation"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Muuri_UI_WPFv3"
Loaded="EventHandler_WindowLoaded">
<Window.Resources>
<DataTemplate x:Key="ResponsesListTemplate">
<local:MessageRowTemplate Margin="3" />
</DataTemplate>
<local:MessageTypeToBrushConverter x:Key="converter" />
</Window.Resources>
<StackPanel Orientation="Vertical">
<local:MessageRowTemplate x:Name="questionControl" />
<ListBox HorizontalAlignment="Stretch" ItemTemplate="{DynamicResource ResponsesListTemplate}" ItemsSource="{Binding}" Name="listBoxResponses" Height="200" ScrollViewer.VerticalScrollBarVisibility="Visible" Style="{StaticResource MuuriListboxStyle}" />
<StackPanel Orientation="Horizontal">
<Button Name="buttonReply" Click="EventHandler_ButtonReplyClicked">Reply</Button>
<Button Name="buttonCancel" Click="EventHandler_ButtonCancelClicked">Cancel</Button>
</StackPanel>
</StackPanel>
</local:MuuriWindow>
这是 MessageRowTemplate.xaml:
<UserControl x:Class="Muuri_UI_WPFv3.MessageRowTemplate"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Muuri_UI_WPFv3"
Width="300"
Loaded="UserControl_Loaded">
<UserControl.Resources>
<local:MessageTypeToBrushConverter x:Key="converter" />
</UserControl.Resources>
<Grid Margin="2,1,2,1" VerticalAlignment="Top" Height="auto">
<Grid.RowDefinitions>
<RowDefinition Height="2" />
<RowDefinition Height="0.5*" />
<RowDefinition Height="0.5*" />
<RowDefinition Height="2" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="15"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Border Name="leftBorder" Margin="2,2,0,2" Grid.RowSpan="4" CornerRadius="3,0,0,3" Panel.ZIndex="1" Background="{Binding Path=Type, Converter={StaticResource converter}}" />
<Border Margin="0,0,0,0" Grid.Column="1" Grid.ColumnSpan="2" Grid.RowSpan="4" Background="#FF666666" CornerRadius="0,5,5,0" />
<Border Margin="0,0,0,0" Grid.ColumnSpan="2" Grid.RowSpan="4" Background="{x:Null}" BorderThickness="2,2,2,2" BorderBrush="#FF202020" CornerRadius="5,5,5,5" Panel.ZIndex="0" />
<TextBlock Padding="5,2,5,2" HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Text="{Binding Path=Text}" Grid.Row="1" Grid.Column="1" Foreground="White" />
<TextBlock Padding="5,2,5,2" HorizontalAlignment="Stretch" VerticalAlignment="Center" Text="{Binding Path=Author}" Grid.Row="2" Grid.Column="1" Foreground="White" />
</Grid>
</UserControl>
正如您可能猜到的,值转换器负责将某些值转换为画笔。它适用于此<local:MessageRowTemplate x:Name="questionControl" />
,但不适用于列表框项目。
谷歌没有给我任何关于“列表框”、“列表框项”、“用户控件”、“值转换器”的关键字组合的提示。
你有想法吗?
预先感谢。