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Owner drawn tree control horiz item extent question...?

Posted on 2001-07-16
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Last Modified: 2013-12-03
Hi all.  I am writing a custom tree control where I draw everything in the item's area.  Since I draw my own stuff, including boxes that extend past the end of my text, Windows doesn't know what the real X (horizontal) extent of my items are.

The result is that I do not get an horizontal scrolling bar where I should.  

How can I tell Windows the true extent of my items?  

Thanks for the help.
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Question by:asselins
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6 Comments
 
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Expert Comment

by:robpitt
ID: 6288950
Is this a new custom control that you have created which is similar to a tree view control?
-OR-
Are you using custom draw to customise the standard tree view control?
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Expert Comment

by:robpitt
ID: 6289173
Two additional thoughts....

If using custom draw and handling CDDS_ITEMPREPAINT, have you tried just enlarging the rect in the customdraw structure?

And what about just calling SetScrollInfo() to change the page size, maybe that'll work.
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Author Comment

by:asselins
ID: 6290685
It's a derivative of CTreeCtrl which handles NM_CUSTOMDRAW.

You can't enlarge the rect that is initialized as part of the CDDS_ITEMPREPAINT notification, because it is read only.  It always contains the rect that is of the full width of the tree control and of whatever height you dictated for your items, so you can take care of indentation and whatnot.

I didn't look into SetScrollInfo(), I'll give that a try.
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