Icon background color in CTreeView,MFC

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Hi,
I have a CTreeView in a splitter window.I want to change the background color at runtime(using a menu).Iam using

GetTreeCtrl().SetBkColor(...)

function to change the background.Now the problem is the background color of icons associated with the tree items is not changing, Though i am changing the bacgroung using,

(GetTreeCtrl().GetImageList(TVIS_NORAMAL)->SetBkColor(...))

The background of images in the icon editor is given as transparent.What will be the problem?Any help?

Posted 22-Feb-11 22:05pm

వేంకటనారాయణ(venkatmakam)

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Niklas L 23-Feb-11 9:30am

Check that you have created the image list with the ILC_MASK flag.

వేంకటనారాయణ(venkatmakam) 1-Mar-11 2:28am

oh thank you its working now.But can you please explain what is ILC_MASK, I diid not understand from msdn

Niklas L 1-Mar-11 4:42am

That flag tells the image list that the image(s) has transparent parts, which icons do. An icon actually consists of two bitmaps. One contains the image you specify, and the other is a monochrome bitmap, a bitmap with only two colors, which tells which pixels should be rendered from the first bitmap and which should not. Where the bitmap is not rendered, there will be a 'hole', and the background will shine through. The icon editor handles this for you, but you will have to let the image list know you want to use it.

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aravindkrgec · Answer 1 · 2011-02-23T00:40:00

Solution 1

I think when you give the background color as transparent, the default window color is used, in your case white, I persume. To change it, you can either set the bg color of image to the desired color using SetBkColor on CtlColor().

Posted 23-Feb-11 0:40am

aravindkrgec