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Asked: 2026-06-04T22:53:54+00:00

How can I simulate a key (ctrl) being hold down while some other code

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How can I simulate a key (ctrl) being hold down while some other code is executed? What would be the implementation of the following method?

self ctrlDownWhile: [self doSomething]
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  1. Editorial Team

    You could try to “trick” the input state, by changing its “ctrlDown” state.
    The bad news is that it does not have a setter-method to access it (maybe only in my version), so you may have to get there with a trick:

    ctrlDownWhile:aBlock
  "aBlock will see ctrlDown as true"

  |indexOfCtrlState|

  indexOfCtrlState := InputState allInstVarNames indexOf:'ctrlState'.

  InputState default instVarAt:indexOfCtrlState put:1.   
  aBlock  
    ensure: [
      InputState default instVarAt:indexOfCtrlState put:0.
    ].

    an alternative is to create keyPress & keyRelease-events for the CTRL-key, and enqueue them into the WindowSensor, before and after the block’s evaluation.

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