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// Available variables: | |
// - Machine | |
// - interpret | |
// - assign | |
// - send | |
// - sendParent | |
// - spawn | |
// - raise | |
// - actions | |
// - XState (all XState exports) | |
const sharedEvents = { | |
SELECT: { | |
target: '#audioPlayer.playing', | |
actions: ['setCurrentTrack'], | |
}, | |
NEXT: { | |
target: '#audioPlayer.playing', | |
actions: ['toggleTrack'], | |
}, | |
PREVIOUS: { | |
target: '#audioPlayer.playing', | |
actions: ['toggleTrack'], | |
} | |
} | |
const playerMachine = Machine({ | |
id: 'audioPlayer', | |
initial: 'gettingPlaylist', | |
context: { | |
currentTrack: null, | |
errorMessage: null, | |
playlist: null | |
}, | |
states: { | |
gettingPlaylist: { | |
invoke: { | |
src: 'getPlaylist', | |
onDone: { | |
target: 'paused', | |
actions: ['setPlaylist', 'setFirstTrack', 'removeErrorMessage'] | |
}, | |
onError: { | |
target: 'paused.error', | |
actions: ['setErrorMessage'], | |
}, | |
}, | |
}, | |
paused: { | |
initial: 'idle', | |
states: { | |
idle: { | |
on: { | |
...sharedEvents, | |
PLAY: { | |
target: '#audioPlayer.playing', | |
} | |
} | |
}, | |
error: { | |
on: { | |
RETRY: { | |
target: '#audioPlayer.gettingPlaylist', | |
}, | |
}, | |
}, | |
}, | |
}, | |
playing: { | |
on: { | |
...sharedEvents, | |
PAUSE: { | |
target: '#audioPlayer.paused.idle', | |
}, | |
} | |
}, | |
}, | |
}, { | |
services: { | |
getPlaylist: () => Promise.resolve(['first', 'second', 'last']), | |
}, | |
actions: { | |
setPlaylist: assign({ | |
playlist: (context, event) => event.data, | |
}), | |
setFirstTrack: assign({ | |
currentTrack: (context) => context.playlist[0], | |
}), | |
setErrorMessage: assign({ | |
errorMessage: (context, event) => event.data, | |
}), | |
setCurrentTrack: assign({ | |
currentTrack: (context, event) => event.track || context.playlist[0], | |
}), | |
removeErrorMessage: assign({ | |
errorMessage: () => null, | |
}), | |
toggleTrack: assign({ | |
currentTrack: (context, event) => { | |
const { currentTrack, playlist } = context | |
const currentTrackIndex = playlist.indexOf(currentTrack) | |
const nextTrackIndex = (currentTrackIndex + 1) % playlist.length | |
const previousTrackIndex = currentTrackIndex === 0 ? playlist.length - 1 : currentTrackIndex - 1 | |
console.log({playlist, previousTrackIndex}) | |
switch (event.type) { | |
case 'NEXT': | |
return playlist[nextTrackIndex] | |
case 'PREVIOUS': | |
return playlist[previousTrackIndex] | |
default: | |
throw new Error('Unexpected event type in toggleTrack action: ' + event.type) | |
} | |
}, | |
}), | |
}, | |
}); | |
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