@gravity-ui/graph
Version:
Modern graph editor component
88 lines (87 loc) • 3.17 kB
JavaScript
// TODO: throtled with leading need test
import { scheduler } from "../../lib/Scheduler";
const getNowTime = () => performance.now();
export class FrameDebouncer {
constructor() {
this.nextFrameFns = [];
this.tmpFns = [];
this.mapOriginalToBindedFn = new WeakMap();
}
run(frameTime) {
const start = getNowTime();
if (this.nextFrameFns.length === 0)
return;
for (let i = 0; i < this.nextFrameFns.length; i += 1) {
this.nextFrameFns[i](frameTime + getNowTime() - start);
}
this.nextFrameFns = this.tmpFns;
this.tmpFns = [];
}
add(fn, options = {}) {
const bindedFn = this.getBindedFunction(fn, options);
this.mapOriginalToBindedFn.set(fn, bindedFn);
return (...args) => {
if (!bindedFn.inOrder) {
this.nextFrameFns.push(bindedFn);
bindedFn.inOrder = true;
}
bindedFn.args = args;
bindedFn.delay = options.throttle || options.leading ? bindedFn.delay : options.delay;
};
}
delete(fn) {
const bindedFn = this.mapOriginalToBindedFn.get(fn);
const i = this.nextFrameFns.indexOf(bindedFn);
if (i !== -1) {
this.nextFrameFns.splice(i, 1);
bindedFn.inOrder = false;
}
}
getBindedFunction(fn, options) {
const bindedFn = this.createBindedFunction(fn, options);
bindedFn.delay = options.delay;
bindedFn.args = [];
return bindedFn;
}
createBindedFunction(fn, options) {
const bindedFn = (frameTime) => {
const hardFrame = options.lightFrame ? frameTime > 16 : frameTime > options.frameTime;
const skip = options.leading ? bindedFn.delay < options.delay : bindedFn.delay > 0;
if (hardFrame || skip) {
// skip original function
if (options.leading) {
bindedFn.delay += 1;
if (hardFrame || bindedFn.delay < options.delay) {
this.tmpFns.push(bindedFn);
}
else {
bindedFn.inOrder = false;
}
}
else {
this.tmpFns.push(bindedFn);
bindedFn.delay -= 1;
}
return;
}
const run = options.leading ? bindedFn.delay >= options.delay : bindedFn.delay < 1;
if (run) {
// perform original function
fn(...bindedFn.args);
if (options.throttle) {
bindedFn.delay = options.delay;
}
if (options.leading) {
bindedFn.delay = 0;
this.tmpFns.push(bindedFn);
}
else {
bindedFn.inOrder = false;
}
}
};
return bindedFn;
}
}
export const frameDebouncer = new FrameDebouncer();
scheduler.addScheduler({ performUpdate: frameDebouncer.run.bind(frameDebouncer) }, 4);