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Meaning of this expression

Moris526 (3)
Hi.

Im trying to program for arduino. Trying to learn bit by bit.

This is an example code for a keyboard input.


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  TrellisCallback blink(keyEvent evt){
  
  if(evt.bit.EDGE == SEESAW_KEYPAD_EDGE_RISING)
    trellis.pixels.setPixelColor(evt.bit.NUM, Wheel(map(evt.bit.NUM, 0, trellis.pixels.numPixels(), 0, 255))); //on rising
  else if(evt.bit.EDGE == SEESAW_KEYPAD_EDGE_FALLING)
    trellis.pixels.setPixelColor(evt.bit.NUM, 0); //off falling



I need to understand each part of this ¨evt.bit.NUM¨

Any comment will help.

thanks
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