private void tvColumns_DragDrop(Object sender, DragEventArgs e)
{
string sourceTableName;
TreeNode sourceNode = (TreeNode)e.Data.GetData(typeof(TreeNode));
sourceTableName = sourceNode.TreeView.Parent.Name;
Table sourceTable = (Table)sourceNode.TreeView.Parent;
Point start = sourceNode.TreeView.Parent.Location; //start position of a line
Debug.WriteLine("source parent point: " + start.ToString());
Debug.WriteLine("source node location: " + sourceNode.TreeView.PointToClient(new Point(e.X, e.Y)));
string destinationTableName;
TreeNode destinationNode;
Table targetTable;
Point destinationPoint = tvColumns.PointToClient(new Point(e.X, e.Y)); //destination of the tree node where we do the drop
destinationNode = tvColumns.GetNodeAt(destinationPoint);
Point end = destinationNode.TreeView.Parent.Location; //end position of a line;
Debug.WriteLine("dest parent point: " + end.ToString());
Debug.WriteLine("dest node location: " + destinationNode.TreeView.PointToClient(new Point(e.X, e.Y)));
if (destinationNode != null)
{
destinationTableName = (sender as TreeView).Parent.Name;
targetTable = (Table)destinationNode.TreeView.Parent;
if (sourceTableName.Equals(destinationTableName))
{
e.Effect = DragDropEffects.None;
return;
}
//Debug.WriteLine("drag from : " + sourceNode.Text);
//Debug.WriteLine("drag from table: " + sourceNode.TreeView.Parent.Name);
Debug.WriteLine("Drop at: " + destinationNode.Text);
Debug.WriteLine("Drop at table: " + (sender as TreeView).Parent.Name);
///drawing line
FormJoin frm = (FormJoin)destinationNode.TreeView.Parent.Parent.Parent.Parent.Parent.Parent;
Relationship rel = new Relationship();
rel.From = sourceTable;
rel.SrcPoint = start;
rel.SrcOffset = sourceNode.TreeView.PointToClient(new Point(e.X, e.Y));
rel.To = targetTable;
rel.TargetPoint = end;
rel.TargetOffset = destinationNode.TreeView.PointToClient(new Point(e.X, e.Y));
rel.FromColumn = sourceNode.Text;
rel.ToColumn = destinationNode.Text;
frm.onCallback(rel);
}
}
public void onCallback(Relationship rel)
{
this.relationship.Add(rel);
this.panel1.Invalidate();
}