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Copy paththrottle.ts
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59 lines (50 loc) · 1.3 KB
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export function throttle<T extends(...args: any[]) => any>(callback: T) {
let pending = false;
let frameId: number = null;
let lastArgs: any[];
const throttled: T = ((...args: any[]) => {
lastArgs = args;
if (frameId) {
pending = true;
} else {
callback(...lastArgs);
frameId = requestAnimationFrame(() => {
frameId = null;
if (pending) {
callback(...lastArgs);
pending = false;
}
});
}
}) as any;
const cancel = () => {
cancelAnimationFrame(frameId);
pending = false;
frameId = null;
};
return Object.assign(throttled, {cancel});
}
type Task = () => void;
export function createAsyncTasksQueue() {
const tasks: Task[] = [];
let frameId = null;
function runTasks() {
let task: Task;
while (task = tasks.shift()) {
task();
}
frameId = null;
}
function add(task: Task) {
tasks.push(task);
if (!frameId) {
frameId = requestAnimationFrame(runTasks);
}
}
function cancel() {
tasks.splice(0);
cancelAnimationFrame(frameId);
frameId = null;
}
return {add, cancel};
}