If needed, I could create and submit a patch.

Kevin, if you could submit a working patch, that would be great! Or we we can try to do it ourselves - unless I'm missing something it should be just a few lines.

Steve, I will try to create a patch then. As you said there should be just a few lines need to be added.

Topic pushed to https://github.com/kevinwangcanada/Slicer/tree/2869-Direction-Matrix-not-exposed-in-volume-info-widget/

I used 3 ctkCoordinateWidgets to display the direction vectors for I, J, K. see the attached picture. If you think this takes too much space, I can try either a textbox that puts the 3 vectors into one line (separated by ;) or use a ctkCollapsibleGroupBox.

I have also found a minor issue with the ctkVolumeInfoWidget code. when a volume is loaded and then removed from the scene, the volume info widget does not get updated and it will still display the old info. see attached volume_info_not_updated.png picture. I have modified the code to fix that. Do I need to create a new ticket/topic/branch for that or maybe I can use the same topic again?

I believe you could use a ctkMatrixWidget instead, it will take less space.
Make sure the matrix can be selectable (if someone wants to copy the matrix).

Thanks for the explanation. I am able to select all the cells in the matrix widget by changing the selectionMode to QAbstractItemView::MultipleSeletion, however, ctkMatrixWidget will need to be modified to enable the copy/paste functionality. Maybe we reconsider this feature later?

Sure, this is definitely out of scope.
I didn't know ctkMatrixWidget didn't support the multi selection correctly. My bad.

No problem, I have pushed the updated topic to https://github.com/kevinwangcanada/Slicer/tree/2869-Direction-Matrix-not-exposed-in-volume-info-widget

Thanks.

Fixed in r21711
See http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=21711

thanks. I have closed the issue.

It most likely generated the following issue 0003010