mvvm如何使列表视图自动滚动到列表视图中的新项目

Question

我正在使用MVVM模式,我有一个创建新视图的视图ViewModel,在用户单击保存后,此视图关闭并打开一个单独的视图,其中显示了一组视图模型ListView.

这ListView是按字母顺序排序的,因此新的ViewModel可能会出现在ListBox用户无法立即看到的底部.

我的问题是如何让视图自动滚动到新添加的项目？

我想它会使用附加的行为和ScrollIntoView事件ListView,但是我需要从GridView我不确定的事件中捕获哪个事件.

干杯

Answer 1

此解决方案适用于ListBox,但可以针对ListView进行修改...当您从ViewModel更改所选项目时,这将滚动所选项目进入视图.

类:

/// <summary>
/// ListBoxItem Behavior class
/// </summary>
public static class ListBoxItemBehavior
{
    #region IsBroughtIntoViewWhenSelected

    /// <summary>
    /// Gets the IsBroughtIntoViewWhenSelected value
    /// </summary>
    /// <param name="listBoxItem"></param>
    /// <returns></returns>
    public static bool GetIsBroughtIntoViewWhenSelected(ListBoxItem listBoxItem)
    {
        return (bool)listBoxItem.GetValue(IsBroughtIntoViewWhenSelectedProperty);
    }

    /// <summary>
    /// Sets the IsBroughtIntoViewWhenSelected value
    /// </summary>
    /// <param name="listBoxItem"></param>
    /// <param name="value"></param>
    public static void SetIsBroughtIntoViewWhenSelected(
      ListBoxItem listBoxItem, bool value)
    {
        listBoxItem.SetValue(IsBroughtIntoViewWhenSelectedProperty, value);
    }

    /// <summary>
    /// Determins if the ListBoxItem is bought into view when enabled
    /// </summary>
    public static readonly DependencyProperty IsBroughtIntoViewWhenSelectedProperty =
        DependencyProperty.RegisterAttached(
        "IsBroughtIntoViewWhenSelected",
        typeof(bool),
        typeof(ListBoxItemBehavior),
        new UIPropertyMetadata(false, OnIsBroughtIntoViewWhenSelectedChanged));

    /// <summary>
    /// Action to take when item is brought into view
    /// </summary>
    /// <param name="depObj"></param>
    /// <param name="e"></param>
    static void OnIsBroughtIntoViewWhenSelectedChanged(
      DependencyObject depObj, DependencyPropertyChangedEventArgs e)
    {
        ListBoxItem item = depObj as ListBoxItem;
        if (item == null)
            return;

        if (e.NewValue is bool == false)
            return;

        if ((bool)e.NewValue)
            item.Selected += OnListBoxItemSelected;
        else
            item.Selected -= OnListBoxItemSelected;
    }

    static void OnListBoxItemSelected(object sender, RoutedEventArgs e)
    {
        // Only react to the Selected event raised by the ListBoxItem 
        // whose IsSelected property was modified.  Ignore all ancestors 
        // who are merely reporting that a descendant's Selected fired. 
        if (!Object.ReferenceEquals(sender, e.OriginalSource))
            return;

        ListBoxItem item = e.OriginalSource as ListBoxItem;
        if (item != null)
            item.BringIntoView();
    }

    #endregion // IsBroughtIntoViewWhenSelected
}

将xmlns添加到视图中:

xmlns:util="clr-namespace:YourNamespaceHere.Classes"

将样式添加到Window/UserControl的资源:

<Window.Resources>
    <Style x:Key="ListBoxItemContainerStyle" TargetType="{x:Type ListBoxItem}"
        BasedOn="{StaticResource {x:Type ListBoxItem}}">
        <Setter Property="util:ListBoxItemBehavior.IsBroughtIntoViewWhenSelected" Value="true"/>
    </Style>
</Window.Resources>

实现列表框:

<ListBox ItemsSource="{Binding MyView}"
         DisplayMemberPath="Title"
         SelectedItem="{Binding SelectedItem}" 
         ItemContainerStyle="{StaticResource ListBoxItemContainerStyle}"/>