[SOLVED] [2005] ComboBox: Relation between ItemHeight and MaxDropDownItems?

tim8w · #1 (**permalink**) 04-21-08, 06:07 PM

What is the relationship between ItemHeight and MaxDropDownItems? I would have thought that the total DropDownHeight would be a multiple of the two. It doesn't appear to be. Anyone know the answer to this?

job0107 · #2 (**permalink**) 04-21-08, 08:06 PM

ItemHeight, is used in ListBoxes to vary the height of an item in the list.
All items in the list can have the same height or they can each have different heights.

MaxDropDownItems, is used with DropDownBoxes to limit the number of items that will be displayed when the DropDownBox is open. Default Max is 100.

tim8w · #3 (**permalink**) 04-21-08, 10:46 PM

job0107,
I know what they are. I'm trying to have 20 items displayed in a DropDown all 25 pixels high. They problem is that the higher the ItemHeight, the less items that get displayed...

tim8w · #4 (**permalink**) 04-23-08, 12:56 AM

Figured out what I was looking for.

Here's the two modes in question:

ComboBox.DrawMode = DrawMode.OwnerDrawVariable

(1) MeasureItem gets called and ItemHeight can be modified. Each item can have a "Variable" height set for it.
(2) MaxDropDownItems never is reached because of the variable ItemHeight.

ComboBox.DrawMode = DrawMode.OwnerDrawFixed

(1) MeasureItem doesn't get called and there is no way to set the ItemHeight. Each item has a fixed height.
(2) MaxDropDownItems are displayed.