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import {createFactory, arrayOf, onPatch, getSnapshot, applySnapshot, onSnapshot, applyPatches, IModelFactory, unionOf, primitiveFactory} from 'mobx-state-tree' | |
const Patch = createFactory({ | |
op: '', | |
path: '', | |
value: '' | |
}) | |
function createForm(Factory){ | |
const F = createFactory({ | |
value: Factory, | |
binding: Factory, | |
patches: arrayOf(Patch) | |
}) | |
return (state?, env?) => { | |
const instance = F() | |
let inRestore = false | |
const getValueSnapshot = () => | |
getSnapshot(instance.value === null ? Factory() : instance.value ) | |
instance.value = !!state && !!state.value ? Factory(state.value) : Factory() | |
instance.binding = Factory(getValueSnapshot()) | |
const runInRestore = fn => (...args) => { | |
if(inRestore) return | |
inRestore = true | |
const value = fn(...args) | |
inRestore = false | |
return value | |
} | |
onPatch(instance.binding, runInRestore(patch => { | |
instance.patches.push(Patch(patch)) | |
})) | |
onSnapshot(instance, runInRestore(snapshot => { | |
const newInstance = Factory(getValueSnapshot()) | |
applyPatches(newInstance, instance.patches.slice() as any[]) | |
applySnapshot(instance.binding, getSnapshot(newInstance)) | |
})) | |
return instance | |
} | |
} | |
const User = createFactory({ | |
name: '', | |
password: '' | |
}) | |
const UserForm = createForm(User) | |
const form = UserForm() | |
form.binding.password = 'mattia' | |
form.value = User({name: 'michel'}) | |
console.log(getSnapshot(form), getSnapshot(form.binding)) |
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