Drag and Drop Treeview Item into listview

Udayaraju

:confused:Hi EveryBody, How to Drag and Drop Treeview Item into listview? Please help me out.. I have one parent node and two child nodes. when I drag a Parent Node, included child nodes are also to be dragged. And all of them to be placed in listview row (3 columns). Please help me out with a sample example. Itz very urgent for me:confused::confused:

Udayaraju

Please reply me

DaveyM69

Udayaraju wrote:

Itz very urgent for me

... but not urgent for us. I saw your post hours ago but ignored it because of this. Bumping your post will not get you any further. I won't give you the code but I'll give you the theory so you can code it yourself. If you get stuck with a specific part of your code, post it and we'll have a look. What you want is a very simple 3 step process. In the treeview's mousedown event , get the node at the mouse point. Set the selectednode to be that node If it's not null and is a 'Parent' node, call the treeview's DoDragDrop method. In the listview's dragover event, set the effect property of the event arguments to copy. In the litview's DragDrop event, convert the data to a treenode (would be a good idea to null check here too) then convert it and it's nodes (children) to a listviewitem with listviewsubitems and add to your listview.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Udayaraju

Hi, Thanq for ur Suggestion But i tried inthes way..can you corect the problem here. See the below code. Here I have a Problem. Treeview has already one root node and twochild nodes with it. They have to be dragged and dropped in listview. The main Problem is wen I drag an item..the Itemdrag event is not fired.?? Please try to resolve it. private void tvwSalesProducts_ItemDrag(object sender, ItemDragEventArgs e) { tvwSalesProducts.DoDragDrop(e.Item, DragDropEffects.Copy | DragDropEffects.Move); } private void lstMultiProItems_DragEnter(object sender, DragEventArgs e) { e.Effect = DragDropEffects.Copy | DragDropEffects.Move; } private void lstMultiProItems_DragDrop(object sender, DragEventArgs e) { if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode", false)) { string[] Items = new string[5]; TreeNode SourceNode; SourceNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode"); Items[0] = Convert.ToString(SourceNode.Tag); Items[1] = SourceNode.Text.ToString(); Items[2] = SourceNode.FirstNode.Text.ToString(); Items[3] = SourceNode.LastNode.Text.ToString(); lstMultiProItems.Items.Clear(); lstMultiProItems.Columns.Add("ID", 100, HorizontalAlignment.Left); lstMultiProItems.Columns.Add("Product Name", 100, HorizontalAlignment.Left); lstMultiProItems.Columns.Add("Selling Price", 100, HorizontalAlignment.Left); lstMultiProItems.Columns.Add("Conversion", 100, HorizontalAlignment.Left); ListViewItem Item1 = new ListViewItem(Items); lstMultiProItems.Items.Add(Item1); lstMultiProItems.AllowColumnReorder = false; lstMultiProItems.FullRowSelect = true; } }

DaveyM69

Check out the working code below and compare - you should be able to figure it out from this.

/\* Assumes
TreeView treeView1. Parent node must have Tag "Parent" and
exactly two child nodes for drag to work
ListView listView1 with three columns already added.

Events subscribed
treeView1.ItemDrag += new ItemDragEventHandler(treeView1\_ItemDrag);
listView1.DragOver += new DragEventHandler(listView1\_DragOver);
listView1.DragDrop += new DragEventHandler(listView1\_DragDrop);
\*/
void treeView1\_ItemDrag(object sender, ItemDragEventArgs e)
{
    TreeNode nodeData = (TreeNode)e.Item;
    // set as selected
    treeView1.SelectedNode = nodeData;
    // check is parent using tag property
    if ((string)nodeData.Tag == "Parent" && nodeData.Nodes.Count == 2)
        // OK
        treeView1.DoDragDrop(nodeData, DragDropEffects.Copy);
}
void listView1\_DragOver(object sender, DragEventArgs e)
{
    // default to none
    e.Effect = DragDropEffects.None;
    // get tree node
    TreeNode nodeData = (TreeNode)e.Data.GetData(typeof(TreeNode));
    // check data in case coming from elsewhere
    if (nodeData != null && (string)nodeData.Tag == "Parent" && nodeData.Nodes.Count == 2)
        // OK so proceed
        e.Effect = DragDropEffects.Copy;

}
void listView1\_DragDrop(object sender, DragEventArgs e)
{
    // get tree node
    TreeNode nodeData = (TreeNode)e.Data.GetData(typeof(TreeNode));
    // check data
    if (nodeData != null && (string)nodeData.Tag == "Parent" && nodeData.Nodes.Count == 2)
    {
        // convert
        ListViewItem newItem = new ListViewItem(nodeData.Text);
        foreach (TreeNode childNode in nodeData.Nodes)
        {
            ListViewItem.ListViewSubItem newSub = new ListViewItem.ListViewSubItem();
            newSub.Text = childNode.Text;
            // add children to parent
            newItem.SubItems.Add(newSub);
        }
        // add parent
        listView1.Items.Add(newItem);
    }
}

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is n

Udayaraju

Guys Please Help me out, I have added the event handlers from front end design. but still the event is not fired. Can u please tel me wther the code is correct or not

Udayaraju

Thanq very mUch Dave..... these may help me a Lot. I wil go through It and cum with u New errors.. Jus Kidding:thumbsup: