Display_D_HP/TeamAAS-VM/Behaviors/ListBoxUserSelectionBehavior.cs

using Microsoft.Xaml.Behaviors;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace TeamAAS_VP.Behaviors
{
    public class ListBoxUserSelectionBehavior : Behavior<ListBox>
    {
        public static readonly DependencyProperty UserSelectionCommandProperty =
            DependencyProperty.Register(
                nameof(UserSelectionCommand),
                typeof(ICommand),
                typeof(ListBoxUserSelectionBehavior));

        public ICommand UserSelectionCommand
        {
            get => (ICommand)GetValue(UserSelectionCommandProperty);
            set => SetValue(UserSelectionCommandProperty, value);
        }

        public static readonly DependencyProperty CommandParameterProperty =
            DependencyProperty.Register(
                nameof(CommandParameter),
                typeof(object),
                typeof(ListBoxUserSelectionBehavior));

        public object CommandParameter
        {
            get => GetValue(CommandParameterProperty);
            set => SetValue(CommandParameterProperty, value);
        }

        protected override void OnAttached()
        {
            base.OnAttached();
            AssociatedObject.PreviewMouseDown += OnPreviewMouseDown;
            AssociatedObject.SelectionChanged += OnSelectionChanged;
        }

        protected override void OnDetaching()
        {
            base.OnDetaching();
            AssociatedObject.PreviewMouseDown -= OnPreviewMouseDown;
            AssociatedObject.SelectionChanged -= OnSelectionChanged;
        }

        private void OnPreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            AssociatedObject.Tag = true; // 标记为用户交互
        }

        private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (AssociatedObject.Tag is bool isUserInteraction && isUserInteraction)
            {
                if (UserSelectionCommand?.CanExecute(CommandParameter) == true)
                {
                    var parameter = new Tuple<object, object>(
                        CommandParameter,
                        AssociatedObject.SelectedItem);

                    UserSelectionCommand.Execute(parameter);
                }
                AssociatedObject.Tag = false; // 重置标记
            }
        }
    }
}