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// npm i -S 'array-move' | |
// import arrayMove from 'array-move'; | |
const MIN_NUM_SURVEYS = 1; | |
const MAX_NUM_SURVEYS = 4; | |
const canAdd = context => context.surveys.length < MAX_NUM_SURVEYS; | |
const canClone = context => context.surveys.length < MAX_NUM_SURVEYS; | |
const canDelete = context => context.surveys.length > MIN_NUM_SURVEYS; | |
const canMoveLeft = (context, event) => context.surveys.length > 1 && event.survey !== undefined; | |
const canMoveRight = (context, event) => context.surveys.length > 1 && event.survey !== undefined; | |
const canDeleteGuard = (context, event) => | |
context.surveys.length > 0 && event.survey !== undefined && context.surveys.length > MIN_NUM_SURVEYS; | |
const canCloneGuard = (context, event) => | |
context.surveys.length > 0 && event.survey !== undefined && context.surveys.length < MAX_NUM_SURVEYS; | |
const surveysMachine = Machine( | |
{ | |
id: 'surveys', | |
type: 'parallel', | |
context: { | |
surveys: [], | |
canAdd: true, | |
canClone: false, | |
canDelete: false, | |
selected: undefined, | |
}, | |
states: { | |
selected: { | |
initial: 'idle', | |
states: { | |
idle: { | |
on: { | |
SELECT_SURVEY: { | |
target: 'idle', | |
actions: assign({ | |
selected: (context, event) => { | |
return event.survey; | |
}, | |
}), | |
}, | |
DELETE_SURVEY: { | |
target: 'idle', | |
actions: assign({ | |
selected: (context, event) => { | |
if (event.survey === context.selected) { | |
const selectedIndex = context.surveys.indexOf(event.survey); | |
return selectedIndex === -1 ? context.surveys[0] : context.surveys[selectedIndex - 1]; | |
} | |
return context.selected; | |
}, | |
}), | |
}, | |
CLONE_SURVEY: { | |
target: 'idle', | |
actions: assign({ | |
selected: context => context.selected, | |
}), | |
}, | |
}, | |
}, | |
}, | |
}, | |
items: { | |
initial: 'idle', | |
states: { | |
error: { | |
entry: (a, b, c) => { | |
console.log('error->entry'); | |
console.log('a', a); | |
console.log('b', b); | |
console.log('c', c); | |
console.log(''); | |
}, | |
}, | |
adding: { | |
entry: assign({ | |
surveys: (context, event) => { | |
const { name = 'Default Name', title, firstName, lastName } = event; | |
return context.surveys.concat({ name, title, firstName, lastName }); | |
}, | |
}), | |
on: { | |
'': { target: 'idle' }, | |
}, | |
}, | |
deleting: { | |
entry: assign({ | |
surveys: (context, { survey }) => { | |
const selectedIndex = context.surveys.indexOf(survey); | |
context.surveys.splice(selectedIndex, 1); | |
return context.surveys; | |
}, | |
}), | |
on: { | |
'': { target: 'idle' }, | |
}, | |
}, | |
cloning: { | |
entry: assign({ | |
surveys: (context, { survey }) => { | |
// might need to use deepClone here | |
const selectedIndex = context.surveys.indexOf(survey); | |
context.surveys.splice(selectedIndex, 0, { ...survey }); | |
return context.surveys; | |
}, | |
}), | |
on: { | |
'': { target: 'idle' }, | |
}, | |
}, | |
movingLeft: { | |
entry: assign({ | |
surveys: (context, { survey }) => { | |
const selectedIndex = context.surveys.indexOf(survey); | |
return arrayMove(context.surveys, selectedIndex, selectedIndex - 1); | |
}, | |
}), | |
on: { | |
'': { target: 'idle' }, | |
}, | |
}, | |
movingRight: { | |
entry: assign({ | |
surveys: (context, { survey }) => { | |
const selectedIndex = context.surveys.indexOf(survey); | |
return arrayMove(context.surveys, selectedIndex, selectedIndex + 1); | |
}, | |
}), | |
on: { | |
'': { target: 'idle' }, | |
}, | |
}, | |
idle: { | |
entry: ['canAdd', 'canClone', 'canDelete'], | |
on: { | |
ADD_SURVEY: [ | |
{ | |
target: 'error', | |
cond: (context, event) => event.name === undefined, | |
}, | |
{ target: 'adding', cond: 'canAdd' }, | |
], | |
DELETE_SURVEY: [ | |
{ | |
target: 'error', | |
cond: (context, event) => event.survey === undefined, | |
}, | |
{ target: 'deleting', cond: 'canDeleteGuard' }, | |
], | |
CLONE_SURVEY: [ | |
{ | |
target: 'error', | |
cond: (context, event) => event.survey === undefined, | |
}, | |
{ target: 'cloning', cond: 'canCloneGuard' }, | |
], | |
MOVE_LEFT: [ | |
{ | |
target: 'error', | |
cond: (context, event) => event.survey === undefined, | |
}, | |
{ target: 'movingLeft', cond: 'canMoveLeft' }, | |
], | |
MOVE_RIGHT: [ | |
{ | |
target: 'error', | |
cond: (context, event) => event.survey === undefined, | |
}, | |
{ target: 'movingRight', cond: 'canMoveRight' }, | |
], | |
}, | |
}, | |
}, | |
}, | |
}, | |
}, | |
{ | |
actions: { | |
canAdd: assign({ canAdd }), | |
canClone: assign({ canClone }), | |
canDelete: assign({ canDelete }), | |
}, | |
guards: { | |
canAdd, | |
canCloneGuard, | |
canDelete, | |
canDeleteGuard, | |
canMoveLeft, | |
canMoveRight, | |
}, | |
} | |
); |
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