This
article
demonstrates drag
and drop between
tree controls
using OLE Drag and
Drop. It also allows an item to
be dropped on same
tree control. When an item is
dropped all the children of that item are
also dropped on the target. The following
key combination can be used:
- Left
button, to copy
an item
-
Ctrl+Left Button,to
copy
an item
-
Shift+Left Button,to move an item
There are
two classes :
-
CDragDropTreeCtrl, for
Tree control.
This class also has a helper function
AddItem() for adding an item to the
tree control.
-
CTreeDropTarget, which provides
functionality of
Drop target
The
CDragDropTreeCtrl registers the
tree control as the
drop target
and starts the drag operation in
respose to the TVN_BEGINDRAG message.
The
CTreeDropTarget is derived from
COleDropTarget
and serves as drop target. This class
overides the following functions:
-
OnDragEnter().
-
OnDragOver(). This function highlights
and expands the item under the mouse
pointer and also scrolls the tree
control appropriately
- OnDrop().
This function creates the item being
dragged in the destination
tree control when the user
releases the mouse button.
What you
have to do You need to do the
following things:
-
#include afxole.h in stdafx.h
- Call
AfxOleInit()
in InitInstance().
- Create
an object of CDragDropTreeCtrl in your
class.
Downloads
Download
demo project - 18 Kb
Download
source - 5 Kb
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