WPF 向后查看 ListView

Question

我希望能够在后台维护一个列表，将新项目放在列表末尾（以避免 Insert() 在更新时推动项目），但能够以相反的顺序显示它，而无需“排序” 。

我只是希望它以与列表中相反的顺序显示在列表视图中。我可以使用模板或类似的东西来做到这一点吗？

Answer 1

更新
这里是一个附加行为，它将逆转任何ItemsControl. 像这样使用它

<ListBox behaviors:ReverseItemsControlBehavior.ReverseItemsControl="True"
         ...>

反向项目控制行为

public class ReverseItemsControlBehavior
{
    public static DependencyProperty ReverseItemsControlProperty =
        DependencyProperty.RegisterAttached("ReverseItemsControl",
                                            typeof(bool),
                                            typeof(ReverseItemsControlBehavior),
                                            new FrameworkPropertyMetadata(false, OnReverseItemsControlChanged));
    public static bool GetReverseItemsControl(DependencyObject obj)
    {
        return (bool)obj.GetValue(ReverseItemsControlProperty);
    }
    public static void SetReverseItemsControl(DependencyObject obj, object value)
    {
        obj.SetValue(ReverseItemsControlProperty, value);
    }

    private static void OnReverseItemsControlChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        if ((bool)e.NewValue == true)
        {
            ItemsControl itemsControl = sender as ItemsControl;
            if (itemsControl.IsLoaded == true)
            {
                DoReverseItemsControl(itemsControl);
            }
            else
            {
                RoutedEventHandler loadedEventHandler = null;
                loadedEventHandler = (object sender2, RoutedEventArgs e2) =>
                {
                    itemsControl.Loaded -= loadedEventHandler;
                    DoReverseItemsControl(itemsControl);
                };
                itemsControl.Loaded += loadedEventHandler;
            }
        }
    }
    private static void DoReverseItemsControl(ItemsControl itemsControl)
    {
        Panel itemPanel = GetItemsPanel(itemsControl);
        itemPanel.LayoutTransform = new ScaleTransform(1, -1);
        Style itemContainerStyle;
        if (itemsControl.ItemContainerStyle == null)
        {
            itemContainerStyle = new Style();
        }
        else
        {
            itemContainerStyle = CopyStyle(itemsControl.ItemContainerStyle);
        }
        Setter setter = new Setter();
        setter.Property = ItemsControl.LayoutTransformProperty;
        setter.Value = new ScaleTransform(1, -1);
        itemContainerStyle.Setters.Add(setter);
        itemsControl.ItemContainerStyle = itemContainerStyle;
    }
    private static Panel GetItemsPanel(ItemsControl itemsControl)
    {
        ItemsPresenter itemsPresenter = GetVisualChild<ItemsPresenter>(itemsControl);
        if (itemsPresenter == null)
            return null;
        return GetVisualChild<Panel>(itemsControl);
    }
    private static Style CopyStyle(Style style)
    {
        Style styleCopy = new Style();
        foreach (SetterBase currentSetter in style.Setters)
        {
            styleCopy.Setters.Add(currentSetter);
        }
        foreach (TriggerBase currentTrigger in style.Triggers)
        {
            styleCopy.Triggers.Add(currentTrigger);
        }
        return styleCopy;
    }

    private static T GetVisualChild<T>(DependencyObject parent) where T : Visual
    {
        T child = default(T);

        int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
        for (int i = 0; i < numVisuals; i++)
        {
            Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
            child = v as T;
            if (child == null)
            {
                child = GetVisualChild<T>(v);
            }
            if (child != null)
            {
                break;
            }
        }
        return child;
    }
}

否则，您可以按照以下链接中的概述进行操作：WPF 反向 ListView

<ListBox ...>
    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <VirtualizingStackPanel VerticalAlignment="Top"  Orientation="Vertical">
                <VirtualizingStackPanel.LayoutTransform>
                    <ScaleTransform ScaleX="1" ScaleY="-1" />
                </VirtualizingStackPanel.LayoutTransform>
            </VirtualizingStackPanel>
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <Setter Property="LayoutTransform">
                <Setter.Value>
                    <ScaleTransform ScaleX="1" ScaleY="-1" />
                </Setter.Value>
            </Setter>
        </Style>
    </ListBox.ItemContainerStyle>
</ListBox>