WPF ListBox中你能来循环？ IE不打硬在顶部和底部停止

Question

我有绑定到的数据对象的列表框WPF。列表框里面是一系列的文本图像。它是在以水平方式奠定出来，鼠标悬停在所述框的左或右侧滚动项目向左或向右分别

让我们说有ListBox中的20个项目。我试图找出如何时，我打19位的项目（基于0），我可以循环盒子，重新开始集合，使其变为1 -19等。那就需要也循环的其他方式，因此，如果你是在项目0，滚动离开，你会得到19

我试过KeyboardNavigation.DirectionalNavigation =“循环”，但是，这并不”似乎为我做什么，我是在抓救命稻草，因为这无关的键盘，它是一个基于所有的鼠标。

        <ListBox ItemsSource="{Binding Source={StaticResource WPFApparelCollection}}" Margin="24,-7,39,-19" ScrollViewer.VerticalScrollBarVisibility="Hidden" ScrollViewer.HorizontalScrollBarVisibility="Hidden" SelectionMode="Single" x:Name="list1" MouseLeave="List1_MouseLeave" MouseMove="List1_MouseMove" Style="{DynamicResource ListBoxStyle1}" Background="Transparent" BorderThickness="0">
            <ListBox.Resources>
                <!-- override the system brushes so that selected items are transparent whether the ListBox has focus or not -->
                <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Transparent" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Transparent" />
                <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Black" />
            </ListBox.Resources>
            <ListBox.ItemContainerStyle>
                <Style TargetType="{x:Type ListBoxItem}">
                    <Setter Property="Background" Value="Transparent" />
                    <Setter Property="HorizontalContentAlignment" Value="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
                    <Setter Property="VerticalContentAlignment" Value="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
                    <Setter Property="Padding" Value="20,10,20,10" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <Border x:Name="Bd" SnapsToDevicePixels="true" Background="Transparent" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
                                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                                </Border>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsSelected" Value="true">
                                        <Setter Property="Background" TargetName="Bd" Value="Transparent" />
                                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}" />
                                    </Trigger>
                                    <MultiTrigger>
                                        <MultiTrigger.Conditions>
                                            <Condition Property="IsSelected" Value="true" />
                                            <Condition Property="Selector.IsSelectionActive" Value="false" />
                                        </MultiTrigger.Conditions>
                                        <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" />
                                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
                                    </MultiTrigger>
                                    <Trigger Property="IsEnabled" Value="false">
                                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </ListBox.ItemContainerStyle>
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <VirtualizingStackPanel Orientation="Horizontal" IsItemsHost="True" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Vertical">
                        <Image Source="{Binding Image}" MouseLeave="Image_MouseLeave" MouseEnter="Image_MouseEnter" Cursor="Hand" Tag="{Binding Link}" MouseLeftButtonDown="Image_MouseLeftButtonDown" VerticalAlignment="Top" HorizontalAlignment="Left"></Image>
                        <Label Content="{Binding Name}" Cursor="Hand" Tag="{Binding Link}" MouseLeftButtonDown="Label_MouseLeftButtonDown" VerticalAlignment="Bottom" Foreground="White" Style="{StaticResource Gotham-Medium}" FontSize="8pt" HorizontalAlignment="Center" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

Answer 1

这里的问题是不是真的与的ListBox ，但与的ScrollViewer 的控件模板;因此，使项目周期你需要改变的的ScrollViewer 以某种方式。我写了从派生的控件的的ScrollViewer ，在垂直方向上的循环...但它应该很容易看到如何使水平过于它的工作。

public class CyclicScrollViewer : ScrollViewer
{
    public CyclicScrollViewer()
    {
        this.CommandBindings.Add(new CommandBinding(ScrollBar.LineUpCommand, LineCommandExecuted));
        this.CommandBindings.Add(new CommandBinding(ScrollBar.LineDownCommand, LineCommandExecuted));
    }

    private void LineCommandExecuted(object sender, ExecutedRoutedEventArgs e)
    {
        if (e.Command == ScrollBar.LineUpCommand)
        {
            if (this.VerticalOffset == 0)
                this.ScrollToEnd();
            else
                this.LineUp();
        }

        if (e.Command == ScrollBar.LineDownCommand)
        {
            if (this.VerticalOffset == this.ScrollableHeight)
                this.ScrollToTop();
            else
                this.LineDown();
        }
    }
}

在 ScrollTo ... 的和的行... 的方法已经存在的的ScrollViewer 使得编码非常简单。所有我在这里做的是检查之前滚动当前对观众的界限偏移。

下一步是插入新的的ScrollViewer 成用于目标控制的控制模板，在这种情况下的列表框即可。这里的一个XAML片段来证明这一点。

        <ControlTemplate x:Key="{x:Type ListBox}" TargetType="ListBox">
            ...
                <l:CyclicScrollViewer 
                    Padding="{TemplateBinding Control.Padding}" 
                    Focusable="False">
                    <ItemsPresenter ... />
                </l:CyclicScrollViewer>
            ...
        </ControlTemplate>

我已使用该代码的示例程序 这里 。该样品不具有键盘的支持，但可以通过重写的的onkeydown 方式并执行适当的线... 的命令被简单地添加。我希望这有助于。

Answer 2

有许多免费和商业WPF转盘实现，做到这一点。看看这篇综述 http://mdavey.wordpress.com/2007 / 04/03 / WPF的圆盘传送带/