Tri state listview

[gabble]

I'm working with a subclassed listview control and I'd like to have the
ability to set the checkbox on a certain item to indeterminate. I've
tried adding three images to the stateimagelist (unchecked, checked,
and indeterminate), but setting the checkstate in the ItemCheck event
doesn't seem to do the trick. Actually, whenever I click on the
checkbox it seems to cycle through the images in the stateimagelist.

Also, once this item is set to indeterminate I'd like to lock it down
so that it's state cannot be changed. Any help on this matter would be
greatly appreciated

[Marcin Grzębski]

Hi,

I'm working with a subclassed listview control and I'd like to have the
ability to set the checkbox on a certain item to indeterminate. I've
tried adding three images to the stateimagelist (unchecked, checked,
and indeterminate), but setting the checkstate in the ItemCheck event
doesn't seem to do the trick. Actually, whenever I click on the
checkbox it seems to cycle through the images in the stateimagelist.

Also, once this item is set to indeterminate I'd like to lock it down
so that it's state cannot be changed. Any help on this matter would be
greatly appreciated

If you're not using icons (images) in a listView then i've got simple
solution for you:
1) prepare images: checked (0), unchecked(1), indeterminate (2)
2) disable checkBoxes in your listView
3) fill your listView.Items with wanted "ImageIndex" settings
4) "CheckedIndices" you've got to write yourself.

Elswere if you need images you can "imitate" the indeterminate
state by listViewItem.BackColor (e.g. SystemColors.Control)

HTH
Marcin