[vtkusers] Re: vtkImagePlaneWidget issues RESOLVED!

[robert tamburo]

I did some digging through the code and found ways to
fix my issues. Just to summarize the issues:
1. Disabling the rotation of a vtkImagePlaneWidget
2. LeftButtonPressEvent not being triggered correctly
for an observer

For 1, I added the ability to enable/disable rotation
with SetRotationEnabled(). In OnMouseMove(),
RotationEnabled is checked with the state Rotating. 

I believe the "correct" way to do it is add virtual
functions for RotationEnabledOff and RotationEnabledOn
and making the variable RotationEnabled protected. I
didn't test this because I was scared to rebuild VTK
:)

For 2, when a LeftButtonPressEvent is triggered the
function OnLeftButtonDown() is called. However, at the
end of the function a StartInteractionEvent is
triggered instead of a LeftButtonPressEvent. I changed
it such that a LeftButtonPressEvent is triggered
instead. It seems to work fine and not break anything.

I've attached the changes to the code. For quick
reference, I added "RJT added this" next to any code
that I added. It'd be great if these changes could be
added to the toolkit (assuming they don't break
anything).

Thanks!
-Robert

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