我试图在Listview中显示包含扩展器和标头的不同组。但是,如果组仅包含1个项目,我不希望我的SecondLevel组显示标题。 因为这会非常不方便。 我的代码:
<Window x:Class="ListViewGrouping.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:listViewGrouping="clr-namespace:ListViewGrouping"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<listViewGrouping:GroupItemStyleSelector x:Key="groupItemStyleSelector"/>
<!-- Style for the first level GroupItem -->
<Style x:Key="FirstLevel" TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="True">
<Expander.Header>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Margin="3.5,0" Text="{Binding Name}" TextBlock.FontWeight="Bold"/>
<TextBlock Grid.Column="1" Margin="3.5,0" Text="Elements:"/>
<TextBlock Grid.Column="2" Margin="3.5,0" Text="{Binding ItemCount}"/>
</Grid>
</Expander.Header>
<ItemsPresenter />
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- Style for the second level GroupItem -->
<Style x:Key="SecondLevel" TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="True" Margin="15,0,0,0">
<Expander.Header>
<TextBlock Text="{Binding Name}" TextBlock.FontWeight="Bold"/>
</Expander.Header>
<ItemsPresenter />
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<ListView Name="mailView" ItemsSource="{Binding}">
<ListView.GroupStyle>
<GroupStyle ContainerStyleSelector="{StaticResource groupItemStyleSelector}" />
</ListView.GroupStyle>
<ListView.View>
<GridView>
<GridViewColumn Header="ID" DisplayMemberBinding="{Binding ID}"/>
<GridViewColumn Header="Subject" DisplayMemberBinding="{Binding Subject}"/>
<GridViewColumn Header="Sender" DisplayMemberBinding="{Binding Sender}"/>
<GridViewColumn Header="Support-ID" DisplayMemberBinding="{Binding Support_ID}"/>
<GridViewColumn Header="Supporter" DisplayMemberBinding="{Binding Supporter}"/>
<GridViewColumn Header="Received" DisplayMemberBinding="{Binding ReceivedDate}"/>
</GridView>
</ListView.View>
</ListView>
</Grid>
代码背后:
private void createMailList()
{
_mails.Add(new Mail("LIC", "Lizenz geht nicht", "Xeun", "LIC.2013.01.10.002", "Xeun", "25.09.2013"));
_mails.Add(new Mail("CD", "Alles doof", "Xeun", "CD.2013.01.10.002", "Xeun", "25.09.2013"));
_mails.Add(new Mail("CD", "Re:Alles doof", "Xeun", "CD.2013.01.10.002", "Xeun", "25.09.2013"));
_mails.Add(new Mail("CD", "CD kaputt", "Xeun", "CD.2013.01.10.003", "Xeun", "25.09.2013"));
_mails.Add(new Mail("CD", "Geht nicht", "Xeun", "CD.2013.01.10.001", "Xeun", "25.09.2013"));
_mails.Add(new Mail("LIC", "Kaputt", "Xeun", "LIC.2013.01.10.001", "Xeun", "25.09.2013"));
}
public MainWindow()
{
InitializeComponent();
createMailList();
DataContext = _mails;
ICollectionView view = CollectionViewSource.GetDefaultView(_mails);
PropertyGroupDescription groupDescription = new PropertyGroupDescription("ID");
view.GroupDescriptions.Add(groupDescription);
view.GroupDescriptions.Add(new PropertyGroupDescription("Support_ID"));
}
}
public class GroupItemStyleSelector : StyleSelector
{
public override Style SelectStyle(object item, DependencyObject container)
{
Style s;
CollectionViewGroup group = item as CollectionViewGroup;
Window window = Application.Current.MainWindow;
if (!group.IsBottomLevel)
{
s = window.FindResource("FirstLevel") as Style;
}
else
{
s = window.FindResource("SecondLevel") as Style;
}
return s;
}
}
我希望我能够很好地解释我的问题 - 我附上了小应用程序的屏幕截图 - 标记为红色的组只包含一个项目,不应该显示为组。
答案 0 :(得分:9)
对于这两种样式,将ControlTemplate拆分为2,一个使用扩展器,另一个使用扩展。
创建一个转换器,用于检查组大小(您的组是否为CollectionViewGroup类型)
return yourGroup.Items.Count > 1
在每种样式中放置一个DataTrigger,如下所示,通过转换器检查组大小 (您的DataContext是您的组,因此绑定是Binding =“{Binding}”
xaml:
<ControlTemplate TargetType="{x:Type GroupItem}" x:Key="withExpander">
<Expander IsExpanded="True">
<Expander.Header>
.....
</Expander.Header>
<ItemsPresenter />
</Expander>
</ControlTemplate>
<ControlTemplate TargetType="{x:Type GroupItem}" x:Key="withOutExpander">
<ItemsPresenter />
</ControlTemplate>
<Style x:Key="FirstLevel" TargetType="{x:Type GroupItem}">
<Setter Property="Template" Value="{StaticResource withExpander}" />
<Style.Triggers>
<DataTrigger Binding="{Binding , Converter={StaticResource GroupSizeToExpanderConverter}" Value="False">
<Setter Property="Template" Value="{StaticResource withOutExpander}"/>
</DataTrigger>
</Style.Triggers>
</Style>
编辑:
*转换器值将是Group本身(类型为CollectionViewGroup)
转换器:
public class GroupSizeToExpanderConverter: IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
CollectionViewGroup grp = (CollectionViewGroup)value;
return grp.Items.Count() > 1; // ALTERNATIVLY grp.ItemCount;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
答案 1 :(得分:0)
这是我的解决方案
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Grid>
<Expander IsExpanded="True">
<Expander.Style>
<Style TargetType="Expander">
<Setter Property="Visibility" Value="Visible"></Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding ItemCount}" Value="1">
<Setter Property="Visibility" Value="Collapsed"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</Expander.Style>
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" />
<TextBlock Text="{Binding ItemCount}" FontSize="22" Foreground="Green" FontWeight="Bold" FontStyle="Italic" Margin="10,0,0,0" VerticalAlignment="Bottom" />
<TextBlock Text=" item(s)" FontSize="22" Foreground="Silver" FontStyle="Italic" VerticalAlignment="Bottom" />
</StackPanel>
</Expander.Header>
<Border BorderBrush="LightBlue" BorderThickness="2" Margin="0 2">
<ItemsPresenter />
</Border>
</Expander>
<ItemsPresenter>
<ItemsPresenter.Style>
<Style TargetType="ItemsPresenter">
<Setter Property="Visibility" Value="Collapsed"></Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding ItemCount}" Value="1">
<Setter Property="Visibility" Value="Visible"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ItemsPresenter.Style>
</ItemsPresenter>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>