SetItemImage() does not work on a CTreeCtrl object

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:

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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);

        //...
}

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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.

Hi!

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

Example code:

Code:

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        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);

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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.

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.

Although this example TvwState.exe Simulates Multiple-Selection TreeView Ctrl does not use MFC, it could give some ideas...

Maybe this helps?

http://www.codeguru.com/cpp/controls...ticle.php/c669

Quote:

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Originally Posted by zerver

Maybe this helps?
http://www.codeguru.com/cpp/controls...ticle.php/c669

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Wow! :)
It looks like much better! :thumb:

Quote:

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Originally Posted by zerver

Maybe this helps?

http://www.codeguru.com/cpp/controls...ticle.php/c669

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Perfect, that was the information I was looking for. Thank you!