#Prevent unnecessary re-rendering

3 messages · Page 1 of 1 (latest)

marsh totem
#

This is an onscreen keyboard component.
I don't feel like rewriting all the properties for a single key button every time because that would make the code look ugly, so I opted for an extra component that I treat as a "key button shorthand", problem is every time I press a key I notice the rest of the keys also rerender because of the state change, what's an alternative solution to prevent this?

  let keyInterval = useRef<NodeJS.Timeout>()
  let keyTimeout = useRef<NodeJS.Timeout>()

  function keyDownBehaviour(action: () => void) {
    action()
    keyTimeout.current = setTimeout(() => {
      keyInterval.current = setInterval(() => {
        action()
      }, 50)
    }, 500)
  }

  function keyUpBehaviour() {
    clearInterval(keyInterval.current)
    clearTimeout(keyTimeout.current)
  }

  function Key({ text }: { text: string }) {
    return (
      <Button
        className="text-lg p-0 w-12"
        variant="outline"
        onMouseDown={() => keyDownBehaviour(() => setState(prevAnswer => prevAnswer + text))}
        onMouseUp={keyUpBehaviour}
        onMouseLeave={keyUpBehaviour}
      >
        {text}
      </Button>
    )
  }

  return (
    <div className="flex flex-col mt-2 gap-2 w-auto">
      <div className="flex gap-[0.2rem] sm:gap-2 w-auto">
        <Key text="b" />
        <Key text="a" />
      </div>
    </div>
  )
}```
languid orchidBOT
#
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forest gyro