Define a Treeview named tvdepartment and set allowdrop to true. // MobileCode
Private Void Mimoveup_click ( Object Sender, eventargs E) // Move up
{
// By Lei Email: Landgis@126.com, yanleigis@21cn.com 2007.10.10
Treenode Node = Tvdepartment. selectednode;
Treenode prevnode = Node. prevnode;
If (Prevnode ! = Null )
{
Treenode newnode = (Treenode) node. Clone ();
If (Node. Parent = Null )
{
Tvdepartment. nodes. insert (prevnode. index, newnode );
}
Else
{
Node. Parent. nodes. insert (prevnode. index, newnode );
}
Node. Remove ();
Tvdepartment. selectednode = Newnode;
}
}
Private Void Mimovedown_click ( Object Sender, eventargs E) // Move down
{
// By Lei Email: Landgis@126.com, yanleigis@21cn.com 2007.10.10
Treenode Node = Tvdepartment. selectednode;
Treenode nextnode = Node. nextnode;
If (Nextnode ! = Null )
{
Treenode newnode = (Treenode) node. Clone ();
If (Node. Parent = Null )
{
Tvdepartment. nodes. insert (nextnode. Index+ 1, Newnode );
}
Else
{
Node. Parent. nodes. insert (nextnode. Index+ 1, Newnode );
}
Node. Remove ();
Tvdepartment. selectednode = Newnode;
}
}
// Drag code
Private Void Tvdepartment_itemdrag ( Object Sender, itemdrageventargs E) // Left-click drag
{
If(E. Button=Mousebuttons. Left)
{
Dodragdrop (E. Item, dragdropeffects. Move );
}
}
Private Void Tvdepartment_dragenter ( Object Sender, drageventargs E)
{
If (E. Data. getdatapresent ( " System. Windows. Forms. treenode " ))
{
E. Effect=Dragdropeffects. move;
}
Else
{
E. Effect=Dragdropeffects. None;
}
}
Private Void Tvdepartment_dragdrop ( Object Sender, drageventargs E) // Drag
{
// By Lei Email: Landgis@126.com, yanleigis@21cn.com 2007.10.10
// Get nodes in drag-and-drop
Treenode movenode = (Treenode) E. Data. getdata ( " System. Windows. Forms. treenode " );
// Determine the target node to be moved to based on the mouse coordinates
Point pt;
Treenode targenode;
PT = (Treeview) (sender). pointtoclient ( New Point (E. X, E. y ));
Targenode = This . Tvdepartment. getnodeat (PT );
// If the target node has no child nodes, it is added as a peer node, and vice versa.
Treenode newmovenode = (Treenode) movenode. Clone ();
If (Targenode. nodes. Count = 0 )
{
Targenode. Parent. nodes. insert (targenode. index, newmovenode );
}
Else
{
Targenode. nodes. insert (targenode. nodes. Count, newmovenode );
}
// Update the selected node that is being dragged
Tvdepartment. selectednode = Newmovenode;
// Expand the target node to show the drag-and-drop effect
Targenode. Expand ();
// Remove drag-and-drop nodes
Movenode. Remove ();
}
