Home > @unseenco/backstage-core > ISequence > pointer

ISequence.pointer property

A Pointer to the sequence's inner state.

Signature:

pointer: Pointer<{
        playing: boolean;
        length: number;
        position: number;
    }>;

Remarks

As with any Pointer, you can use this with onChange() to listen to its value changes or with val() to read its current value.

Example

Usage

import {onChange, val} from '@unseenco/backstage'

// let's assume `sheet` is a sheet
const sequence = sheet.sequence

onChange(sequence.pointer.length, (len) => {
  console.log("Length of the sequence changed to:", len)
})

onChange(sequence.pointer.position, (position) => {
  console.log("Position of the sequence changed to:", position)
})

onChange(sequence.pointer.playing, (playing) => {
  console.log(playing ? 'playing' : 'paused')
})

// we can also read the current value of the pointer
console.log('current length is', val(sequence.pointer.length))