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Initiating a File DragDrop

Posted on 1998-11-29
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Last Modified: 2013-11-20
Given a tree control or such, How do I initiate a simple file drag drop? there is a simple interface at the drop end, but i can't seem to find an easy begin-drag interface point.

any suggestions?

thanks,
Gavin.
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Question by:mrpinko
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Accepted Solution

by:
Bridge earned 100 total points
ID: 1325490
afx_msg void OnBegindrag(NMHDR* pNMHDR, LRESULT* pResult);
      
ON_NOTIFY_REFLECT(TVN_BEGINDRAG, OnBegindrag)

void CHierachyEditorView::OnBegindrag(NMHDR* pNMHDR, LRESULT* pResult)
{
  NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
  m_htDrag = pNMTreeView->itemNew.hItem;

  int nImageNumberN, nImageNumberS;      
  GetTreeCtrl().GetItemImage( m_htDrag, nImageNumberN, nImageNumberS );

  CPoint point;
  GetCursorPos( &point );
  ScreenToClient( &point );

  ShowCursor(FALSE);
  SetCapture();
      
  // Start the drag operation.
  //m_pImageList->SetDragCursorImage( nImageNumberN,CPoint(10,10) );
  m_pImageList->BeginDrag(nImageNumberN,CPoint(10,10));
  m_pImageList->DragEnter(this,point);

  // Hide the mouse cursor, and direct mouse input to the
  // parent window.
  m_bDragging = TRUE;
      
  *pResult = 0;
}

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Author Comment

by:mrpinko
ID: 1325491
OK.. i see. this generates a crsor image which can be moved on mouse moves.
thanks!

to be a little more specific,
with dragging and dropping a *file*, eg. from the windows explorer to my application
CTreeCtrl method  "OnDropFiles" suplies me with the path to the dropped file. How do i go about doing the same thing when transferring a file back the other way? (ie. is there an API interface with which i can define the current drag-and-drop operation as a file drag? and supply the path?

mr pinko.
0
 

Author Comment

by:mrpinko
ID: 1325492
OK.. i see. this generates a crsor image which can be moved on mouse moves.
thanks!

to be a little more specific,
with dragging and dropping a *file*, eg. from the windows explorer to my application
CTreeCtrl method  "OnDropFiles" suplies me with the path to the dropped file. How do i go about doing the same thing when transferring a file back the other way? (ie. is there an API interface with which i can define the current drag-and-drop operation as a file drag? and supply the path?

mr pinko.
0
 
LVL 1

Expert Comment

by:Bridge
ID: 1325493
Use the clipboard format CF_HDROP with the DROPFILES structure.
0
 

Author Comment

by:mrpinko
ID: 1325494
hi bridge, thanks for the comments so far.

i can see how the clipboard can be used to transfer data from one window in my application to another *in my applicataion* using the code given above.
however, this does not help (me at least) in the case where the windows explorer or desktop or other application is the target of the file drag!

it seems to me that i should be able to place the file names on the clipboard (or whatever) and then initiate a "kernel-controlled" or "system-wide" file drag. In such a case, the OS sends a WM_FILEDROP message to teh target window at the correct time.

how are inter-application file drops achieved? is my intuition totally flawed?

thanks,
Gavin.
0

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