# Way to detect Shift + left button

**URL:** https://discourse.vtk.org/t/way-to-detect-shift-left-button/11041
**Category:** Support
**Created:** [March 24, 2023, 5:14pm UTC](https://discourse.vtk.org/t/way-to-detect-shift-left-button/11041 "2023-03-24T17:14:09Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![Kevin\_Sweeney](https://discourse.vtk.org/user_avatar/discourse.vtk.org/kevin_sweeney/32/3935_2.png) [@Kevin\_Sweeney](https://discourse.vtk.org/u/Kevin_Sweeney)
#### Post date: [March 24, 2023, 5:14pm UTC](https://discourse.vtk.org/t/way-to-detect-shift-left-button/11041/1 "2023-03-24T17:14:09Z")

</div>

From this: [RenderWindowInteractor | vtk.js](https://kitware.github.io/vtk-js/api/Rendering_Core_RenderWindowInteractor.html#onLeftButtonPress)

Is there a way to detect when the left mouse button has been clicked (`onLeftButtonPress`) and the `shift` (or other control button) is being held?

---

<div class="post-metadata">

### Author: ![Sebastien\_Jourdain](https://discourse.vtk.org/user_avatar/discourse.vtk.org/sebastien_jourdain/32/100_2.png) [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [March 24, 2023, 10:10pm UTC](https://discourse.vtk.org/t/way-to-detect-shift-left-button/11041/2 "2023-03-24T22:10:13Z")

</div>

Yes we have [that example](https://kitware.github.io/vtk-js/examples/InteractorStyleManipulator.html) which do those kind of redirection for you via an interactor style.