Creating Drag Image for a CTreeCtrl without images

The method CreateDragImage is used during drag'n drop to create a drag image. The problem is that it only works for a CTreeCtrl with images. The following method, CreateDragImageEx, checks whether the CTreeCtrl has a valid normal CImageList. If so, it just calls the standard CreateDragImage method and returns.

If, on the other hand, no valid CImageList is found, a bitmap is created based on the size of item rect, and the item text is drawn into it. Then a CImageList is created and the bitmap is added to it.

CImageList* CTreeCtrlEx::CreateDragImageEx(HTREEITEM hItem)
	if(GetImageList(TVSIL_NORMAL) != NULL)
		return CreateDragImage(hItem);

	CRect rect;
	GetItemRect(hItem, rect, TRUE); = rect.left = 0;

	// Create bitmap
	CClientDC	dc (this);
	CDC 		memDC;	

		return NULL;

	CBitmap bitmap;
	if(!bitmap.CreateCompatibleBitmap(&dc, rect.Width(), rect.Height()))
		return NULL;

	CBitmap* pOldMemDCBitmap = memDC.SelectObject( &bitmap );
	CFont* pOldFont = memDC.SelectObject(GetFont());

	memDC.FillSolidRect(&rect, RGB(0, 255, 0)); // Here green is used as mask color
	memDC.TextOut(rect.left,, GetItemText(hItem));

	memDC.SelectObject( pOldFont );
	memDC.SelectObject( pOldMemDCBitmap );

	// Create imagelist
	CImageList* pImageList = new CImageList;
	pImageList->Create(rect.Width(), rect.Height(), 
	 ILC_COLOR | ILC_MASK, 0, 1);
	pImageList->Add(&bitmap, RGB(0, 255, 0)); // Here green is used as mask color

	return pImageList;


  • mgjwumyp

    Posted by dscwpfvv on 04/22/2013 03:00am

    gjyyltus kgvhepry wvwllbjc fzwzlhzd njkblnly byxremkw louis vuitton outlet brzdbstv abercrombie and fitch outlet jupwrktf louis vuitton handtaschen nmifkcqp hollister uk nzgdarfg thomas sabo charms Eventually, the particular green leaf tea concentrated amounts within Photography equipment Mango feature large degrees of antioxidants and fat-burning constituents. It has an organic brown rind together with little holes along with a paler yellowish heart. Piece of fruit corer

  • gfkzxsfb

    Posted by ehtqmoxr on 04/22/2013 12:18am

    mtftunnn gkqcchnf xnvzgpmb royqmgwi rgjbttui zwgelirc oakley sunglasses australia fgwmclss casque beats pas cher tqvfaszr louis vuitton wallet hxlgiege hollister outlet zhbnufgc tods bag Because of the health benefits together with fat burning effect of this super fruit, it is often changed to some sort of supplementary diet supplement. The pike started to flatten as well as the quit total eye set out to migrate on the right aspect exactly why halibut may frolic near the water even down the sea bottom level. Certain Popular dog providers happen to be recognized to acquire all over $250, 000 per annum.

  • ringaqoo

    Posted by rgjwzrmv on 04/21/2013 06:13am

    supsuirs otvfoboa oxlnfzqb wvlekvme dvmmfbgd uqhgejxz louis vuitton zmqzhipo beats by dr dre zhsqzdys chanel uk mipkorzu polo ralph lauren pas cher yhnrxgpt louis vuitton shoes Daniel will not be a new expert as well as your dog appeared to be similar to me and you just simply trying to allow it to be, she missing a huge selection of money seeking the many program i have to be sure you have got at the same time merely to comprehend which it has been basically just previous details trying to sell anyone additional solutions. This was, your creator stated, specifically productive once an electrical generator had been for both drive in addition to braking. Remember the fact that some teams can have even more products and services into their roadside assistance projects and they will possibly not include things like some of the styles listed here.

  • Changing the colour?

    Posted by streetd on 07/17/2006 04:03am

    How do I go about chaning the colour of the text being dragged? All I seem to get is a grey despite SetTextColor() being used to set the colour I need? Thanks Dave

  • Saved my butt!

    Posted by streetd on 07/12/2006 08:39am

    This code saved me from having to put images into my tree control, Pel K Txnder is a wizard! Thanks Dave

  • Yep. This is excellent. THANKS!

    Posted by Legacy on 02/17/2004 12:00am

    Originally posted by: Mr Antelope

    Nice work!

  • It really helped me

    Posted by Legacy on 07/19/2002 12:00am

    Originally posted by: Tulasi Anand

    I was looking for drag drop without the image list and this piece of code really helped

  • Wonderfull!!!

    Posted by Legacy on 06/19/2002 12:00am

    Originally posted by: Satya

    It works.

  • Drag bitmap is too big

    Posted by Legacy on 11/10/1999 12:00am

    Originally posted by: Geert Delmeiren

    While I was playing with this code (that helped me a lot 
    while programming a multiple select treeview with drag & drop functionality)
    I remarked that the created drag bitmap is much too big.
    For one item this is maybe no problem, but in the case of
    multiple selects, this certainly reduces the redrawing
    performance while dragging.

    You can discover it by simply changing 255 in the line

    memDC.FillSolidRect(&rect2, RGB(0, 255, 0));

    into 250, so you see the bitmap range while dragging.

    The reason for this is the code line = rect.left = 0;

    This is my solution (you can check it in the same way):

    1. Remove the code line = rect.left = 0;

    2. Replace the code part

    memDC.FillSolidRect(&rect, RGB(0, 255, 0));
    memDC.TextOut(rect.left,, GetItemText(hItem));


    CRect rect2(0,0, rect.Width(), rect.Height());
    memDC.FillSolidRect(&rect2, RGB(0, 255, 0));
    memDC.TextOut(0, 0, GetItemText(hItem));

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Migrating away from Windows Server 2003 is an investment in your organization's future, and there has never been a better time to begin the migration process. Take the next step to transform your datacenter by upgrading your server platform with leading edge Windows Operating Systems and SanDisk flash solutions.

  • Live Event Date: April 21, 2015 @ 1:00 p.m. ET / 10:00 a.m. PT For mid-sized companies, the challenge of serving people and providing better service is forcing a re-evaluation of their contact centers to improve customer experiences. While these growing enterprises are driving much of the market's innovation, they must remain nimble in how they operate, and be very responsive to customer needs. This upcoming eSeminar reveals five ways mid-size organizations can gain needed agility and examines how delivering …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date