ListView.DragDrop : ListView « System.Windows.Forms « C# / C Sharp by API

1. C# / C Sharp by API
2. System.Windows.Forms
3. ListView

ListView.DragDrop

 



using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;


public class Form1 : System.Windows.Forms.Form {
    private System.Windows.Forms.ListView listView1= new System.Windows.Forms.ListView();
    private System.Windows.Forms.ListView listView2= new System.Windows.Forms.ListView();
    private System.ComponentModel.Container components = null;
    System.Windows.Forms.ListViewItem listViewItem1 = new System.Windows.Forms.ListViewItem("List 2 Item 1");
    System.Windows.Forms.ListViewItem listViewItem2 = new System.Windows.Forms.ListViewItem("List 2 Item 2");
    System.Windows.Forms.ListViewItem listViewItem3 = new System.Windows.Forms.ListViewItem("List 2 Item 3");
    System.Windows.Forms.ListViewItem listViewItem4 = new System.Windows.Forms.ListViewItem("Item 1");
    System.Windows.Forms.ListViewItem listViewItem5 = new System.Windows.Forms.ListViewItem("Item 2");
    System.Windows.Forms.ListViewItem listViewItem6 = new System.Windows.Forms.ListViewItem("Item 3");

    public Form1() {
        this.SuspendLayout();
        this.listView2.AllowDrop = true;
        listViewItem1.UseItemStyleForSubItems = false;
        listViewItem2.UseItemStyleForSubItems = false;
        listViewItem3.UseItemStyleForSubItems = false;
        this.listView2.Items.AddRange(new System.Windows.Forms.ListViewItem[]{
          listViewItem1,listViewItem2,listViewItem3});
        this.listView2.Location = new System.Drawing.Point(320, 24);
        this.listView2.Size = new System.Drawing.Size(200, 216);
        this.listView2.View = System.Windows.Forms.View.List;
        this.listView2.DragDrop += new System.Windows.Forms.DragEventHandler(this.OnDragDrop);
        this.listView2.DragEnter += new System.Windows.Forms.DragEventHandler(this.OnDragEnter);
        this.listView1.AllowDrop = true;
        listViewItem4.UseItemStyleForSubItems = false;
        listViewItem5.UseItemStyleForSubItems = false;
        listViewItem6.UseItemStyleForSubItems = false;
        this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] { listViewItem4, listViewItem5, listViewItem6 });
        this.listView1.Location = new System.Drawing.Point(40, 24);
        this.listView1.Size = new System.Drawing.Size(200, 216);
        this.listView1.View = System.Windows.Forms.View.List;
        this.listView1.ItemDrag += new System.Windows.Forms.ItemDragEventHandler(this.OnItemDrag);
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(576, 273);
        this.Controls.AddRange(new System.Windows.Forms.Control[] { this.listView2, this.listView1 });
        this.ResumeLayout(false);
    }

    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }

    private void OnItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e) {
        string s = e.Item.ToString();
        DoDragDrop(s, DragDropEffects.Copy | DragDropEffects.Move);
    }
    private void OnDragEnter(object sender,
         System.Windows.Forms.DragEventArgs e) {
        if (e.Data.GetDataPresent(DataFormats.Text))
            e.Effect = DragDropEffects.Copy;
        else
            e.Effect = DragDropEffects.None;
    }

    private void OnDragDrop(object sender, System.Windows.Forms.DragEventArgs e) {
        string typestring = "Type";
        string s = e.Data.GetData(typestring.GetType()).ToString();
        string orig_string = s;
        s = s.Substring(s.IndexOf(":") + 1).Trim();
        s = s.Substring(1, s.Length - 2);

        this.listView2.Items.Add(s);

        IEnumerator enumerator = listView1.Items.GetEnumerator();
        int whichIdx = -1;
        int idx = 0;
        while (enumerator.MoveNext()) {
            string s2 = enumerator.Current.ToString();
            if (s2.Equals(orig_string)) {
                whichIdx = idx;
                break;
            }
            idx++;
        }
        this.listView1.Items.RemoveAt(whichIdx);
    }
}

   
  

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