[Feature]: Add support for double prress

[serejahh]

Problem or use case

Agents (like Siri, Eney or Gemini) toggle their appearance by a double press shortcut.

Eney:

Gemini:

Currently, it's impossible to show such double press shortcuts.

Proposed behavior

Display two keys in a row if they are pressed within a small period of time

Alternatives considered

No response

UI or settings impact

No response

Additional context

No response

[esphynox]

Thanks for suggestion! Let me take a look how feasible is this and report back.

[InSasquatchCountry]

In my mind's eye, I imagine key-specific numeration implemented where I can record an event and set some parameters to dial in timing for that event similar to these examples from Karabiner-Elements and Karabiner-EventViewer.

As stated elsewhere, I have found this project much more stable, functional, and enjoyable than a similar project I had found first, which to be clear I would not recommend. However it did implement key numeration as the default behavior, without any user control mind you.

My final thought is this: Were this numeration feature to be implemented, it would be super trick for the user to be able to select a custom keycap for specific events.

"Super trick" is California slang that refers to something that is exceptionally cool, impressive, or stylish. It often describes modifications or features that enhance the appeal or performance of a vehicle or object.

ex. Under System Preferences → Keyboard → Dictation, I use the default: Press Control Key Twice.

It would be cool to dial settings in such that when I press Control (⌃) twice, Keyty shows a key with the dictation symbol, or even an image of my choosing. For @serejahh's example of Siri, would be cool to be able a Siri Orb on a keycap. I'm going to see if I can mock one up right now. here are some ideas. Since key caps are generated on the fly, there would have to be consideration for how these custom image caps and their image size and plays nicely with KeyboardVisualizerSettings.scale. These examples were made from a screenshot of a control key. If I were trying to get the best renders I'd need to use blank snapshot test PNGs.

apple/SharedGlobalArt/IL_Microphone.png

custom_cap.xcf.zip

spoon.webm

[esphynox]

Spinned off grouping behavior in ticket #122