拖拽功能--拖动列表中的项

最新推荐文章于 2024-01-04 16:38:08 发布

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本文介绍了一个使用 C# 实现的 ListBox 控件拖拽功能的示例程序。该程序展示了如何通过 MouseDown 和 DragEnter 事件实现 ListBox 之间的元素拖拽转移，并附带完整的代码实现。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Walter.K.Wang
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void listBox1_MouseDown(object sender, MouseEventArgs e)
        {
            listBox1.DoDragDrop(listBox1.SelectedItem.ToString(), DragDropEffects.Move);
        }

        private void listBox2_MouseDown(object sender, MouseEventArgs e)
        {
            string items = "";
            for (int i = 0; i < listBox2.SelectedItems.Count; i++)
            {
                items += listBox2.SelectedItems[i].ToString();
            }
            listBox2.DoDragDrop(items, DragDropEffects.Move);
        }

        private void listBox1_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = e.AllowedEffect;
        }

        private void listBox2_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = e.AllowedEffect;
        }

        private void listBox2_DragDrop(object sender, DragEventArgs e)
        {
            if (listBox2.Focused)
            {
                e.Effect = DragDropEffects.None;
            }
            else
            {
                listBox2.Items.Add(e.Data.GetData(DataFormats.Text));
                listBox1.Items.Remove(listBox1.SelectedItem);
            }
        }

        private void listBox1_DragDrop(object sender, DragEventArgs e)
        {
            if (listBox1.Focused)
            {
                e.Effect = DragDropEffects.None;
            }
            else
            {
                listBox1.Items.Add(e.Data.GetData(DataFormats.Text));
                listBox2.Items.Remove(listBox2.SelectedItem);
            }
        }
    }
}