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/** @module opcut/renderer2 */
import * as snabbdom from 'snabbdom/es/snabbdom';
import snabbdomAttributes from 'snabbdom/es/modules/attributes';
import snabbdomClass from 'snabbdom/es/modules/class';
import snabbdomProps from 'snabbdom/es/modules/props';
// import snabbdomStyle from 'snabbdom/es/modules/style';
import snabbdomDataset from 'snabbdom/es/modules/dataset';
import snabbdomEvent from 'snabbdom/es/modules/eventlisteners';
import * as u from 'opcut/util';
import * as ev from 'opcut/ev';
const patch = snabbdom.init([
snabbdomAttributes,
snabbdomClass,
snabbdomProps,
// snabbdomStyle,
snabbdomDataset,
snabbdomEvent
]);
function vhFromArray(node) {
if (!node)
return [];
if (u.isString(node))
return node;
if (!u.isArray(node))
throw 'Invalid node structure';
if (node.length < 1)
return [];
if (typeof node[0] != 'string')
return node.map(vhFromArray);
const hasData = node.length > 1 && u.isObject(node[1]);
const children = u.pipe(
u.map(vhFromArray),
u.flatten,
Array.from
)(node.slice(hasData ? 2 : 1));
const result = hasData ?
snabbdom.h(node[0], node[1], children) :
snabbdom.h(node[0], children);
return result;
}
/**
* Virtual DOM renderer
*/
export class Renderer {
/**
* Calls `init` method
* @param {HTMLElement} [el=document.body]
* @param {Any} [initState=null]
* @param {Function} [vtCb=null]
* @param {Number} [maxFps=30]
*/
constructor(el, initState, vtCb, maxFps) {
this.init(el, initState, vtCb, maxFps);
}
/**
* Initialize renderer
* @param {HTMLElement} [el=document.body]
* @param {Any} [initState=null]
* @param {Function} [vtCb=null]
* @param {Number} [maxFps=30]
* @return {Promise}
*/
init(el, initState, vtCb, maxFps) {
this._state = null;
this._changes = [];
this._promise = null;
this._timeout = null;
this._lastRender = null;
this._vtCb = vtCb;
this._maxFps = u.isNumber(maxFps) ? maxFps : 30;
this._vNode = el || document.querySelector('body');
if (initState)
return this.change(_ => initState);
return new Promise(resolve => { resolve(); });
}
/**
* Get current state value referenced by `paths`
* @param {...Path} paths
* @return {Any}
*/
get(...paths) {
return u.get(paths, this._state);
}
/**
* Change current state value referenced by `path`
* @param {Path} path
* @param {Any} value
* @return {Promise}
*/
set(path, value) {
if (arguments.length < 2) {
value = path;
path = [];
}
return this.change(path, _ => value);
}
/**
* Change current state value referenced by `path`
* @param {Path} path
* @param {Function} cb
* @return {Promise}
*/
change(path, cb) {
if (arguments.length < 2) {
cb = path;
path = [];
}
this._changes.push([path, cb]);
if (this._promise)
return this._promise;
this._promise = new Promise((resolve, reject) => {
setTimeout(() => {
try {
this._change();
} catch(e) {
this._promise = null;
reject(e);
throw e;
}
this._promise = null;
resolve();
}, 0);
});
return this._promise;
}
_change() {
let change = false;
while (this._changes.length > 0) {
const [path, cb] = this._changes.shift();
const view = u.get(path);
const oldState = this._state;
this._state = u.change(path, cb, this._state);
if (this._state && u.equals(view(oldState),
view(this._state)))
continue;
change = true;
if (!this._vtCb || this._timeout)
continue;
const delay = (!this._lastRender || !this._maxFps ?
0 :
(1000 / this._maxFps) -
(performance.now() - this._lastRender));
this._timeout = setTimeout(() => {
this._timeout = null;
this._lastRender = performance.now();
const vNode = vhFromArray(this._vtCb(this));
patch(this._vNode, vNode);
this._vNode = vNode;
ev.fire(this, 'render', [this._state]);
}, (delay > 0 ? delay : 0));
}
if (change)
ev.fire(this, 'change', [this._state]);
}
}
// Renderer.prototype.set = u.curry(Renderer.prototype.set);
// Renderer.prototype.change = u.curry(Renderer.prototype.change);
/**
* Default renderer
* @static
* @type {Renderer}
*/
const defaultRenderer = new Renderer();
export default defaultRenderer;
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