如何为ItemsControl中的每个项创建覆盖?

通常,您会在ItemContainerStyle中添加类似的内容,以免每次应用此内容时都会弄乱DataTemplate本身。虽然这对于可以修改ListBoxItem模板的ListBox很简单,但很遗憾,基本ItemsControl仅使用ContentPresenter作为其容器,因此不能以相同的方式进行模板化。

显然,删除逻辑和视觉样式尚未在此处完成,但这将使您开始:

public class DeleteItemsControl : ItemsControl
{
    public static readonly DependencyProperty CanDeleteProperty = DependencyProperty.Register(
        "CanDelete",
        typeof(bool),
        typeof(DeleteItemsControl),
        new UIPropertyMetadata(null));

    public bool CanDelete
    {
        get { return (bool)GetValue(CanDeleteProperty); }
        set { SetValue(CanDeleteProperty, value); }
    }

    public static RoutedCommand DeleteCommand { get; private set; }

    static DeleteItemsControl()
    {
        DeleteCommand = new RoutedCommand("DeleteCommand", typeof(DeleteItemsControl));
        DefaultStyleKeyProperty.OverrideMetadata(typeof(DeleteItemsControl), new FrameworkPropertyMetadata(typeof(DeleteItemsControl)));
    }

    protected override DependencyObject GetContainerForItemOverride()
    {
        return new DeleteItem();
    }

    protected override bool IsItemItsOwnContainerOverride(object item)
    {
        return item is DeleteItem;
    }
}

public class DeleteItem : ContentControl
{
    static DeleteItem()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(DeleteItem), new FrameworkPropertyMetadata(typeof(DeleteItem)));
    }

}

这将在Generic.xaml中进行,或者您可以像在应用程序中应用普通样式一样应用它们:

<Style TargetType="{x:Type local:DeleteItemsControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:DeleteItemsControl}">
                <Border Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}">
                    <ItemsPresenter/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<Style TargetType="{x:Type local:DeleteItem}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:DeleteItem}">
                <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}">
                    <DockPanel>
                        <Button Command="local:DeleteItemsControl.DeleteCommand" Content="X" HorizontalAlignment="Left" VerticalAlignment="Center"
                            Visibility="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:DeleteItemsControl}}, Path=CanDelete, Converter={StaticResource BooleanToVisibilityConverter}}"/>
                        <ContentPresenter VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
                    </DockPanel>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

DataTemplate 一些绑定。你绝对是在正确的轨道上。

<Window x:Class="TestWpfApplication.Foods"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:TestWpfApplication"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
Title="Foods" ResizeMode="NoResize"
SizeToContent="WidthAndHeight"
DataContext="{Binding RelativeSource={RelativeSource Self}}">
<Window.Resources>
    <local:BoolToVisConverter x:Key="BoolToVisConverter"/>
</Window.Resources>
<StackPanel Background="LightGray">
    <ToggleButton Name="EditModeToggle" Content="Edit" HorizontalAlignment="Right" FontFamily="Arial" Padding="4" 
                  Background="#7FA4E6" Foreground="White" BorderBrush="Black" Width="60" Margin="5,5,5,0"/>
    <ListBox ItemsSource="{Binding Items}" 
             Background="#999" BorderBrush="Black" Margin="5">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <Border CornerRadius="8" Background="#3565BC" Padding="8" 
                        BorderBrush="#333" BorderThickness="1" Margin="2" Width="255">
                    <StackPanel Orientation="Horizontal">
                        <Button Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=RemoveItemCommand}"
                                Visibility="{Binding ElementName=EditModeToggle, Path=IsChecked, Converter={StaticResource BoolToVisConverter}}">
                            <Button.Content>
                                <TextBlock Foreground="Red" Text="X" FontWeight="Bold"/>
                            </Button.Content>
                        </Button>
                        <TextBlock Text="{Binding}" Margin="12,0" Foreground="#AAA" VerticalAlignment="Center"
                                   FontSize="14" FontWeight="Bold" FontFamily="Arial"/>
                    </StackPanel>
                </Border>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</StackPanel>

RoutedCommand :

public partial class Foods : Window
{
    private ObservableCollection<String> items = new ObservableCollection<string>();
    private RoutedCommand removeItemCommand = new RoutedCommand();

    public Foods()
    {
        InitializeComponent();

        items.Add("Ice Cream");
        items.Add("Pizza");
        items.Add("Apple");

        CommandBindings.Add(new CommandBinding(removeItemCommand, ExecutedRemoveItem));
    }

    public ObservableCollection<String> Items
    {
        get { return items; }
    }

    public RoutedCommand RemoveItemCommand
    {
        get { return removeItemCommand; }
    }

    private void ExecutedRemoveItem(object sender, ExecutedRoutedEventArgs e)
    {
        DependencyObject container = 
            ItemsControl.ContainerFromElement(e.Source as ItemsControl, e.OriginalSource as DependencyObject);
        ListBoxItem item = container as ListBoxItem;
        items.Remove(item.Content as String);
    }
}

alt text http://img697.imageshack.us/img697/7033/foodswindow.png