drag and drop between treeviews on different forms

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Hi,

I have two child forms in my MDI application.

They both have treeviews with different data but in teh same format (fund,
tran type)

I want to be able to drag a node from one to the other but it seems it only
works between one or more tree views on the same form, not different forms as
the destination form never gets the focus so the drag enter /over event is
not raised.

How can I either enable drag and drop between two forms from treeview to
treeview or maybe use a copy/paste option?

thanks for any help.

Philip
 
this is code between 2 listview, work between 2 forms, you can try to adapt
it for treeview

Nicolas Guinet

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

namespace ODLV
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.ListView listView1;
private System.Windows.Forms.Splitter splitter1;
private System.Windows.Forms.ListView listView2;
private System.Windows.Forms.ColumnHeader columnHeader1;
private System.Windows.Forms.ColumnHeader columnHeader2;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
bool lv1_mdown = false ;
private System.Windows.Forms.ColumnHeader columnHeader3;
private System.Windows.Forms.ColumnHeader columnHeader5;
bool lv2_mdown = false;

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// TODO: Add any constructor code after InitializeComponent call
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.listView1 = new System.Windows.Forms.ListView();
this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
this.columnHeader3 = new System.Windows.Forms.ColumnHeader();
this.splitter1 = new System.Windows.Forms.Splitter();
this.listView2 = new System.Windows.Forms.ListView();
this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
this.columnHeader5 = new System.Windows.Forms.ColumnHeader();
this.SuspendLayout();
//
// listView1
//
this.listView1.AllowDrop = true;
this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.columnHeader1,
this.columnHeader3});
this.listView1.Dock = System.Windows.Forms.DockStyle.Top;
this.listView1.FullRowSelect = true;
this.listView1.MultiSelect = false;
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(232, 176);
this.listView1.TabIndex = 0;
this.listView1.View = System.Windows.Forms.View.Details;
this.listView1.MouseDown += new
System.Windows.Forms.MouseEventHandler(this.listView1_MouseDown);
this.listView1.DragDrop += new
System.Windows.Forms.DragEventHandler(this.listView1_DragDrop);
this.listView1.DragEnter += new
System.Windows.Forms.DragEventHandler(this.listView1_DragEnter);
this.listView1.MouseMove += new
System.Windows.Forms.MouseEventHandler(this.listView1_MouseMove);
//
// columnHeader1
//
this.columnHeader1.Text = "COL1";
this.columnHeader1.Width = 100;
//
// columnHeader3
//
this.columnHeader3.Text = "COL2";
this.columnHeader3.Width = 100;
//
// splitter1
//
this.splitter1.Dock = System.Windows.Forms.DockStyle.Top;
this.splitter1.Location = new System.Drawing.Point(0, 176);
this.splitter1.Name = "splitter1";
this.splitter1.Size = new System.Drawing.Size(232, 3);
this.splitter1.TabIndex = 1;
this.splitter1.TabStop = false;
//
// listView2
//
this.listView2.AllowDrop = true;
this.listView2.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.columnHeader2,
this.columnHeader5});
this.listView2.Cursor = System.Windows.Forms.Cursors.Arrow;
this.listView2.Dock = System.Windows.Forms.DockStyle.Fill;
this.listView2.FullRowSelect = true;
this.listView2.Location = new System.Drawing.Point(0, 179);
this.listView2.MultiSelect = false;
this.listView2.Name = "listView2";
this.listView2.Size = new System.Drawing.Size(232, 226);
this.listView2.TabIndex = 2;
this.listView2.View = System.Windows.Forms.View.Details;
this.listView2.MouseDown += new
System.Windows.Forms.MouseEventHandler(this.listView2_MouseDown);
this.listView2.DragDrop += new
System.Windows.Forms.DragEventHandler(this.listView2_DragDrop);
this.listView2.DragEnter += new
System.Windows.Forms.DragEventHandler(this.listView2_DragEnter);
this.listView2.MouseMove += new
System.Windows.Forms.MouseEventHandler(this.listView2_MouseMove);
//
// columnHeader2
//
this.columnHeader2.Text = "COL1";
this.columnHeader2.Width = 100;
//
// columnHeader5
//
this.columnHeader5.Text = "COL2";
this.columnHeader5.Width = 100;
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(232, 405);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.listView2,
this.splitter1,
this.listView1});
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void Form1_Load(object sender, System.EventArgs e)
{
ImageList il = new ImageList();
il.Images.Add(new System.Drawing.Icon("tick.ico"));
listView1.SmallImageList = il ;

ImageList i2 = new ImageList();
i2.Images.Add(new System.Drawing.Icon("key04.ico"));
listView2.SmallImageList = i2 ;


string[] items = new string[2];
items[0] = "LA" ; items[1] = "Los Angeles";
listView1.Items.Add(new ListViewItem(items,0));
items[0] = "WA" ; items[1] = "Seattle";
listView1.Items.Add(new ListViewItem(items,0));
items[0] = "IL" ; items[1] = "Chicago";
listView1.Items.Add(new ListViewItem(items,0));

items[0] = "FR" ; items[1] = "Paris";
listView2.Items.Add(new ListViewItem(items,0));
items[0] = "BR" ; items[1] = "London";
listView2.Items.Add(new ListViewItem(items,0));
items[0] = "IN" ; items[1] = "Mumbai";
listView2.Items.Add(new ListViewItem(items,0));

}

private void listView1_DragDrop(object sender,
System.Windows.Forms.DragEventArgs e)
{
string textBox1 = e.Data.GetData(DataFormats.Text).ToString();
string[] items = textBox1.Split(',');
listView1.Items.Add(new ListViewItem(items,0));
lv1_mdown = false ;
lv2_mdown = false ;
}

private void listView2_DragDrop(object sender,
System.Windows.Forms.DragEventArgs e)
{
string textBox1 = e.Data.GetData(DataFormats.Text).ToString();
string[] items = textBox1.Split(',');
listView2.Items.Add(new ListViewItem(items,0));
lv2_mdown = false ;
lv1_mdown = false ;
}

private void listView2_DragEnter(object sender,
System.Windows.Forms.DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Text))
e.Effect = DragDropEffects.Copy;
else
e.Effect = DragDropEffects.None;
}

private void listView1_DragEnter(object sender,
System.Windows.Forms.DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.Text))
e.Effect = DragDropEffects.Copy;
else
e.Effect = DragDropEffects.None;
}

private void listView1_MouseMove(object sender,
System.Windows.Forms.MouseEventArgs e)
{
if ( ! lv1_mdown ) return ;
if ( e.Button == MouseButtons.Right ) return ;

string str = GetItemText(listView1) ;
if ( str == "" ) return ;

listView1.DoDragDrop(str , DragDropEffects.Copy | DragDropEffects.Move )
;
}

private void listView2_MouseMove(object sender,
System.Windows.Forms.MouseEventArgs e)
{
if ( ! lv2_mdown ) return ;
if ( e.Button == MouseButtons.Right ) return ;

string str = GetItemText(listView2) ;
if ( str == "" ) return ;

listView2.DoDragDrop(str, DragDropEffects.Copy | DragDropEffects.Move ) ;
}

private void listView1_MouseDown(object sender,
System.Windows.Forms.MouseEventArgs e)
{
lv1_mdown = true ;
}

private void listView2_MouseDown(object sender,
System.Windows.Forms.MouseEventArgs e)
{
lv2_mdown = true ;
}

public string GetItemText(ListView LVIEW)
{
int nTotalSelected = LVIEW.SelectedIndices.Count;
if ( nTotalSelected <= 0 ) return "";
IEnumerator selCol = LVIEW.SelectedItems.GetEnumerator();
selCol.MoveNext() ;
ListViewItem lvi = (ListViewItem)selCol.Current;
string mDir = "";
for ( int i=0; i < lvi.SubItems.Count;i++)
mDir += lvi.SubItems.Text +",";

mDir = mDir.Substring(0,mDir.Length-1);
return mDir ;
}
}
}
 
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