释放鼠标按钮并扩展选择模式时如何在 WPF Listview 中进行选择更改

问题描述

我在创建 WPF 应用程序期间正在学习 MVVM 模式。不幸的是，我遇到了一点障碍。我想在释放鼠标按钮时更改列表视图中的选择。我找到了一个解决方案 here，但它仅在选择模式为 SIngle 时有效。我必须在以下代码中更改哪些内容才能使用扩展选择模式。提前致谢。

public static class SelectorBehavior
{
    #region bool ShouldSelectItemonmouseup

    public static readonly DependencyProperty ShouldSelectItemonmouseupProperty = 
        DependencyProperty.Registerattached(
            "ShouldSelectItemonmouseup",typeof(bool),typeof(SelectorBehavior),new PropertyMetadata(default(bool),HandleShouldSelectItemonmouseupChange));

    public static void SetShouldSelectItemonmouseup(DependencyObject element,bool value)
    {
        element.SetValue(ShouldSelectItemonmouseupProperty,value);
    }

    public static bool GetShouldSelectItemonmouseup(DependencyObject element)
    {
        return (bool)element.GetValue(ShouldSelectItemonmouseupProperty);
    }

    private static void HandleShouldSelectItemonmouseupChange(
        DependencyObject d,DependencyPropertyChangedEventArgs e)
    {
        if (d is Selector selector)
        {
            selector.PreviewMouseDown -= HandleSelectPreviewMouseDown;
            selector.MouseUp -= HandleSelectMouseUp;

            if (Equals(e.NewValue,true))
            {
                selector.PreviewMouseDown += HandleSelectPreviewMouseDown;
                selector.MouseUp += HandleSelectMouseUp;
            }
        }
    }

    private static void HandleSelectMouseUp(object sender,MouseButtonEventArgs e)
    {
        var selector = (Selector)sender;

        if (e.ChangedButton == MouseButton.Left && e.OriginalSource is Visual source)
        {
            var container = selector.ContainerfromElement(source);
            if (container != null)
            {
                var index = selector.ItemContainerGenerator.IndexFromContainer(container);
                if (index >= 0)
                {
                    selector.Selectedindex = index;
                }
            }
        }
    }

    private static void HandleSelectPreviewMouseDown(object sender,MouseButtonEventArgs e)
    {
        e.Handled = e.ChangedButton == MouseButton.Left;
    }

    #endregion

}

XAML：

<ListBox ItemsSource="{Binding viewmodelItems}" 
 SelectedItem="{Binding SelectedviewmodelItem}" 
 ui:SelectorBehavior.ShouldSelectItemonmouseup="True" />

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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