NM_DBLCK...where is the mouse position?!

Deepak Saxena -- Deepak_Saxena@ccm.ch.intel.com
Monday, May 20, 1996

VC 4.1, nt 3.51

I have a CTreeView derived class that is handling NM_DBLCK messages
sent to me by the tree ctrl.  My only question is where is the mouse
location or the item handle stored?  I looked in the win32 docs and
all it has for NM_DBLCLK is that it's sent when the user double-clicks on 
the control.

tnx

-- 
Deepak_Saxena@ccm.ch.intel.com         | I'm a 21st century digital boy
http://cernan.ecn.purdue.edu/~deepak   | I don't know how to live,
Home:(602)812-8933, Work:(602)554-1304 |   but I got a lot of toys.
My opinions, not Intel's!              |       - Bad Religion -

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Ken Freeman -- kfreeman@pobox.com
Thursday, May 23, 1996

[Mini-digest: 10 responses]

Use ::GetMessagePos to get the mouse position in screen
coordinates, convert to client coordinates, and use HitTest
to see where the double click occurred.

Ken

-----From: "Len Wilcox" 

I too am working on a program with a CTreeView class and ran into the 
same issue.  The solution is to use the GetMessagePos() function 
which returns the position of the mouse for the last message.  Below 
is a segment from my code.

 // Get the Point of the Click
 CPoint ptRClick(LOWORD(GetMessagePos()), HIWORD(GetMessagePos()));


----
Len Wilcox - wilcoxs@access.digex.net, lwilcox@naitech.com
Home Page: http://www.access.digex.net/~wilcoxs/

Featuring downloadable shareware developed by Len Wilcox.
-----From: Deepak Saxena 


Text item: 


Replying to my self.  The way to do this is to either:

a) Use GetMessagePos() to get the mouse position and then map that into 
a treeview item

b) Use CTreeCtrl::GetSelectedItem()

Deepak

-----From: Overmyer 

This function may suggest some approaches:

BOOL CTVView::DoHitTest(TV_HITTESTINFO& tvhti, TV_ITEM& tvi)
{
  BOOL      res = FALSE;
  
  ::GetCursorPos((LPPOINT)&(tvhti.pt));
  ::ScreenToClient(m_hWnd, &(tvhti.pt));
  m_TreeCtl.HitTest(&tvhti);
  if (!((tvhti.flags & TVHT_ONITEMLABEL) || (tvhti.flags & TVHT_ONITEMRIGHT)))
    return res;
  m_TreeCtl.SelectItem(tvhti.hItem);
  
  //get the TV_ITEM 
  tvi.mask = TVIF_PARAM;
  tvi.hItem = tvhti.hItem;
  res = m_TreeCtl.GetItem(&tvi);
  return res;
}


Here's a sample use:

/****************************************************************************
*    PURPOSE:  handle NM_RCLICK
****************************************************************************/
void CTVView::OnRClick(NMHDR *pNMHDR,LRESULT *pResult) 
{
  LPARAM lParam = (LPARAM) pNMHDR;
  POINT pt;
  NM_TREEVIEW *pnmtv   = (NM_TREEVIEW *)lParam;
  LPTVITEMDATA      lptvid;  //Long pointer to TreeView item data
  TV_HITTESTINFO    tvhti;
  TV_ITEM           tvi;
  char              szPath[MAX_PATH];
  UINT              res = 0;
  HANDLE            hChange = 0;
  ULONG           ulAttrs=(SFGAO_FOLDER | SFGAO_FILESYSTEM | SFGAO_VALIDATE)  ;


  if (m_IsCriticalSection) return;
  ::GetCursorPos(&pt);
  //did we click on an item
  if ( !DoHitTest(tvhti,tvi) ) return;   
  
...






I use this same function for NM_DBLCLK notification.

Best Wishes,

Doug

Doug and Elizabeth Overmyer  
overmyer@netcom.com


-----From: "David W. Gillett" 

  Although you'd never find it searching from NM_DBLCK, I'd bet that 
the NMHDR pointer provided in the message really points to the start 
of an NM_TREEVIEW structure, whose additional fields can be used to 
find this information.  Indeed, it looks like ClassWizard will 
probably provide such a cast when told to add a handler for this 
notification.

Dave
-----From: "Frederic Steppe" 

You have to ask the tree control (get it with CTreeView::GetTreeCtrl()) :

Use GetSelectedItem() to find the item that was clicked.
Use GetItemRect() to get the rectangle occupied by the item (or the item text)

If you really need to know where exactly is the mouse pointer you can use 
::GetCursorPos()


Frederic Steppe (frederics@msn.com)
-----From: coutadeur.f@ccmail.cgi.fr

     Hi,
     
        Here is what ClassWizard generates for me : 
     
     treeCtrl::OnTreeDblclk(NMHDR* pNMHDR, LRESULT* pResult)
      {
        NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
        // TODO: Add your control notification handler code here
      }
     
     NM_TREEVIEW contains a itemNew member, wich contains a hItem value ( 
     HTREEITEM ). This is your item !
     
     Hope this help!
     
        Fabrice Coutadeur

-----From: "William Cook" 

You need to call GetMessagePos() to do this. You'll
probably then have to call ScreenToClient(POINT*).

Bill Cook
-----From: Niv 

//////////////////////////
HTREEITEM CMyTreeView::GetTreeItemOnCursor() 
{
	UINT nFlags;
	CPoint curPoint;
	CTreeCtrl *treectl=(CTreeCtrl*)GetDlgItem(IDC_TREE1);

	GetCursorPos(&curPoint);
	ScreenToClient(&curPoint);
	return treectl->HitTest(curPoint, &nFlags);
}
///////////////////////////


USE:
void CMyTreeView::OnDblclkTree1(NMHDR* pNMHDR, LRESULT* pResult) 
{
HTREEITEM ItemSel=GetTreeItemOnCursor();
	if(ItemSel)
	{
	YOU'RE ON IT !!!
	}
	



/////

HOPES THAT HELPS

NIV THE "TOOL" !!!
-----From: Georg Breithaupt 

I would just use the function :
The GetCursorPos function retrieves the cursor's position, in screen coordinates. 

BOOL GetCursorPos(  LPPOINT lpPoint   );

The next to do is call the function ScreenToClient() form CWnd:
void ScreenToClient( LPPOINT lpPoint ) const;

Example:

YourNotification( ... )
{
	CPoint pt;
	GetCursorPos( &pt );
	ScreenToClient( &pt );
	// pt has the Cursorpos 
}

Hope it will help

Georg

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