# Interactor from old version to 4.10.2
**URL:** https://discourse.slicer.org/t/interactor-from-old-version-to-4-10-2/9493
**Category:** Support
**Created:** [December 14, 2019, 1:34am UTC](https://discourse.slicer.org/t/interactor-from-old-version-to-4-10-2/9493 "2019-12-14T01:34:56Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@fraca](https://discourse.slicer.org/u/fraca)
#### Post date: [December 14, 2019, 1:34am UTC](https://discourse.slicer.org/t/interactor-from-old-version-to-4-10-2/9493/1 "2019-12-14T01:34:56Z")
Hi, i’m try to convert this code that was build for 3DSlicer 3.6 to the newest 3DSlicer 4.10.2, but i have some issues to define the interactor.
Can you help me?
> self.RedSliceInteractor=slicer.ApplicationGUI.GetMainSliceGUI(“Red”).GetSliceViewer().GetRenderWidget().GetRenderWindowInteractor()
> self.RedSliceLeftButtonReleaseTag=self.RedSliceInteractor.AddObserver(“LeftButtonReleaseEvent”,self.HandleClickInRedSlice)
This is a part of the function that needs the interactor:
> def HandleClickInRedSlice(self):
> if not self.Selecting:
> return
> coordinates = self.RedSliceInteractor.GetLastEventPosition()
> ctrlKey = self.RedSliceInteractor.GetControlKey()
I’m trying to observe the mouse left-click on the Red Slice of 3DSlicer, and i have also to check if Ctrl-key is pressed and to take the coordinates on the image of the point pressed
---
### Author:  [@fraca](https://discourse.slicer.org/u/fraca)
#### Post date: [December 14, 2019, 1:34am UTC](https://discourse.slicer.org/t/interactor-from-old-version-to-4-10-2/9493/2 "2019-12-14T01:34:53Z")
Hi, i’m trying to update this code (build for 3DSlicer 3.6) for 3DSlicer 4.10.2 but i have some issues with the interactor. I want to observe the “LeftButtonReleaseEvent” when i press only on the Red Slice Viewer (in 3DSlicer).
> self.RedSliceInteractor=slicer.ApplicationGUI.GetMainSliceGUI(“Red”).GetSliceViewer().GetRenderWidget().GetRenderWindowInteractor() self.RedSliceLeftButtonReleaseTag=self.RedSliceInteractor.AddObserver(“LeftButtonReleaseEvent”,self.HandleClickInRedSlice)
This is the first part of the function that i call above:
> def HandleClickInRedSlice(self):
> if not self.Selecting:
> return
> coordinates = self.RedSliceInteractor.GetLastEventPosition()
> ctrlKey = self.RedSliceInteractor.GetControlKey()
So i want to obatin also the coordinates of the point where i clicked and i i pressed the Ctrl key.
Can you help me?
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### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [December 15, 2019, 6:08am UTC](https://discourse.slicer.org/t/interactor-from-old-version-to-4-10-2/9493/3 "2019-12-15T06:08:36Z")
Interactors are hard. I would not recommend to implement features at such low level but instead utilize Markups widgets to define point positions, lines, curves, etc. See examples in script repository: [https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Manipulating\_objects\_in\_the\_slice\_viewer](https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Manipulating_objects_in_the_slice_viewer)
---
### Author:  [@fraca](https://discourse.slicer.org/u/fraca)
#### Post date: [December 17, 2019, 11:46am UTC](https://discourse.slicer.org/t/interactor-from-old-version-to-4-10-2/9493/4 "2019-12-17T11:46:30Z")
Thanks for your suggestion. There’s a way to run a function when i create only one markup node with mouse-click? I tried to do something with `AddObserver`, but i found some issues.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [December 17, 2019, 1:07pm UTC](https://discourse.slicer.org/t/interactor-from-old-version-to-4-10-2/9493/5 "2019-12-17T13:07:59Z")
See working examples in the script repository, for example: [https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Manipulating\_objects\_in\_the\_slice\_viewer](https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Manipulating_objects_in_the_slice_viewer)