SetItemImage() does not work on a CTreeCtrl object

**zony** · November 19th, 2008, 04:50 AM

Hello everybody. In a small dialog-based program of mine I am using a CTreeCtrl with a variable amount of child items. Now I want some items to have an icon besides the text which reflects the item state (the icons should not depend on whether the tree is expanded or not!). From what I read I should be using state based images in that case. "Normal" icons work well, but there seems to be something wrong with state based icons - they are not showing up at all.

The code that I got up to now:

Code:

BOOL CMyClassDlg::OnInitDialog()
{
	//...

	m_ImageList.Create(IDB_ICONS, 10, 1, RGB(255,255,255));
	m_tcDeviceList.SetImageList(&m_ImageList, TVSIL_STATE);
	//m_tcDeviceList.SetImageList(&m_ImageList, TVSIL_NORMAL);
	
	m_hTreeRoot = m_tcDeviceList.InsertItem(L"Root", TVI_ROOT);
	m_tcDeviceList.SetItemData(m_hTreeRoot, IDR_MENU_ROOT);
	m_tcDeviceList.SetItemImage(m_hTreeRoot, 1, 1);
	
	HTREEITEM item;
	item = m_tcDeviceList.InsertItem(L"Child", m_hTreeRoot);
	m_tcDeviceList.SetItemData(item, IDR_MENU_CHILD);
	m_tcDeviceList.SetItemImage(item, 0, 0);

	//...
}

IDB_ICONS is a bitmap of 30x10 pixels in size (three 10x10 icons). What am I missing? Do I have to redraw the CTreeCtrl somehow to make the images show up?

Thanks in advance.

**zerver** · November 19th, 2008, 06:35 AM

Hi!

Try individual icons rather than the bitmap and see if it makes a difference.

Example code:

Code:

	ImageListTree.Create(16,16,ILC_COLOR4,0,1);
	ImageListTree.Add(AfxGetApp()->LoadIcon(IDI_CLOSEDFOLDER));
	ImageListTree.Add(AfxGetApp()->LoadIcon(IDI_OPENFOLDER));
	ImageListTree.SetBkColor(ImageListTree.GetBkColor());
	TreeCtrl.SetImageList(&ImageListTree,LVSIL_NORMAL);

When you use SetItemImage, simply pass the indexes of the images you want to use.
The default image indexes is 0 for non-selected and 1 for selected I think.

**zony** · November 19th, 2008, 08:12 AM

Thanks for your reply. Unfortunately only empty white fields appear next to the item name (I tried using the default icons IDI_ERROR and IDI_EXCLAMATION). But anyways, TVSIL_NORMAL icons are already working, I'm only having these issues with TVSIL_STATE icons. When using TVSIL_NORMAL icons all tree elements show the same image. Once I change the icon type to TVSIL_STATE no image is shown at all in the tree (even after calling SetItemImage()).

Maybe my understanding is wrong here but I thought creating a CImageList and assigning it to my CTreeCtrl is enough to be able to use SetItemImage() on a HTREEITEM to make one of the images in the list to show up?

Thanks.