44 lines
1.3 KiB
TypeScript
44 lines
1.3 KiB
TypeScript
// Copyright (c) 2020 The Brave Authors. All rights reserved.
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// you can obtain one at https://mozilla.org/MPL/2.0/.
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export default function throttle (fn: Function, bufferTimeMs: number, callAtEnd: boolean = false) {
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let hasCalled = false
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let pendingCallArgs: any[] | null = null
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return function (...callArgs: any[]) {
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if (!hasCalled) {
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pendingCallArgs = null
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hasCalled = true
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fn(...callArgs)
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// Do not allow function to be called for x seconds
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setTimeout(function () {
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hasCalled = false
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if (pendingCallArgs) {
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fn(...callArgs)
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pendingCallArgs = null
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}
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}, bufferTimeMs)
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} else {
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// Save args so we can call after interval
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pendingCallArgs = callArgs
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}
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}
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}
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export function requestAnimationFrameThrottle (fn: Function) {
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let hasPendingCall = false
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return function (...callArgs: any[]) {
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if (!hasPendingCall) {
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hasPendingCall = true
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window.requestAnimationFrame(() => {
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hasPendingCall = false
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fn(...callArgs)
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})
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} else {
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// We are waiting for animation frame,
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// skip this extra call
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}
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}
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}
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