Trigger key press Virtual keyboard button?

[Former user]

Here code I found in source (file: fceux-1dca6bb7.js) registerKeyEventCallback

->HEAP32[JSEvents.keyEvent + 156 >> 2] = e.keyCode

How can I trigger key press (like vitural keyboard button)?

Thank you.

[Valtteri Heikkilä]

Do you intend to trigger joypad button presses (and perhaps other peripherals like Zapper)?

There’s no js API function (to WebAssembly/C++ code) to do this right now. The API is defined in SConstruct file. Look for exportsList:

  exportsList = [
    'main',
    'FCEM_OnSaveGameInterval',
    'FCEM_SetController',
    'FCEM_BindKey',
    'FCEM_BindGamepad',
    'FCEM_SilenceSound'
  ]

‌

[Tuấn Ngô]

Thanks for responded.

I wanna trigger with virtual pad for smart phone on screen, I try callback events key for instead but not good.

Has this project ended and can continue?

‌

[Valtteri Heikkilä]

There’s no support for virtual gamepads ATM. But there’s this issue, so I’ve thought about it: https://bitbucket.org/tsone/em-fceux/issues/10/.

BTW Haven’t tried but it’s possible bluetooth gamepads work on mobile browsers: https://caniuse.com/#search=gamepad.

[Matthew Walker]

FYI - you can simulate a keypress through the window:

window.dispatchEvent(new KeyboardEvent('keydown',{'keyCode':13}));

I’ve confirmed that this indeed does work on mobile devices.

[Valtteri Heikkilä]

Update, I’ve added functions setControllerBits() and triggerZapper() in em-fceux. Use these in your app to set the controllers/Zapper based on whatever input method you use, virtual gamepad etc. (See API.md for all the API functions.)

[Tuấn Ngô]

Thanks, @Valtteri Heikkilä . It sounds good for custom gamepad.