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| var cuid = require("cuid") | |
| var dom = require("./render") | |
| var diff = require("./diff") | |
| var patch = require("./patch") | |
| var isString = require("./lib/is-string") | |
| /* Usage | |
| var thunk = require("virtual-dom/thunk") | |
| module.exports = thunk(function render(current, previous) { | |
| if (previous && previous.id === current.id) { | |
| return null | |
| } | |
| return h("div", current.value) | |
| }) | |
| */ | |
| module.exports = thunk | |
| function thunk(type, render) { | |
| if (arguments.length === 1) { | |
| render = type | |
| type = null | |
| } | |
| function Thunk(state) { | |
| if (!(this instanceof Thunk)) { | |
| return new Thunk(state) | |
| } | |
| this.state = state | |
| this.vnodes = new Map() // set all properties | |
| } | |
| Thunk.prototype.type = isString(type) ? type : cuid() | |
| Thunk.prototype.render = render | |
| Thunk.prototype.init = initThunk | |
| Thunk.prototype.update = updateThunk | |
| return Thunk | |
| } | |
| function initThunk() { | |
| var vnode = this.render(this.state) | |
| var domNode = dom(this.vnode) | |
| this.vnodes.set(domNode, vnode) | |
| return domNode | |
| } | |
| function updateThunk(previous, domNode) { | |
| var currentState = this.state | |
| var render = this.render | |
| var vnode = this.vnodes.get(domNode) | |
| if (!vnode) { | |
| vnode = render(currentState, previous.state) | |
| this.vnodes.set(domNode, vnode) | |
| } | |
| var prevNode = previous.vnodes.get(domNode) | |
| if (vnode) { | |
| patch(domNode, diff(prevNode, vnode)) | |
| } else { | |
| this.vnodes.set(domNode, prevNode) | |
| } | |
| } |
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