@blueprintjs/core
Version:
Core styles & components
93 lines • 3.56 kB
JavaScript
;
/*
* Copyright 2020 Palantir Technologies, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.throttle = exports.throttleReactEventCallback = exports.throttleEvent = exports.elementIsOrContains = void 0;
var functionUtils_1 = require("./functionUtils");
function elementIsOrContains(element, testElement) {
return element === testElement || element.contains(testElement);
}
exports.elementIsOrContains = elementIsOrContains;
/**
* Throttle an event on an EventTarget by wrapping it in a
* `requestAnimationFrame` call. Returns the event handler that was bound to
* given eventName so you can clean up after yourself.
*
* @see https://developer.mozilla.org/en-US/docs/Web/Events/scroll
*/
function throttleEvent(target, eventName, newEventName) {
var throttledFunc = throttleImpl(function (event) {
target.dispatchEvent(new CustomEvent(newEventName, event));
});
target.addEventListener(eventName, throttledFunc);
return throttledFunc;
}
exports.throttleEvent = throttleEvent;
/**
* Throttle a callback by wrapping it in a `requestAnimationFrame` call. Returns
* the throttled function.
*
* @see https://www.html5rocks.com/en/tutorials/speed/animations/
*/
function throttleReactEventCallback(callback, options) {
if (options === void 0) { options = {}; }
var throttledFunc = throttleImpl(callback, function (event2) {
if (options.preventDefault) {
event2.preventDefault();
}
},
// prevent React from reclaiming the event object before we reference it
function (event2) { return event2.persist(); });
return throttledFunc;
}
exports.throttleReactEventCallback = throttleReactEventCallback;
/**
* Throttle a method by wrapping it in a `requestAnimationFrame` call. Returns
* the throttled function.
*/
// eslint-disable-next-line @typescript-eslint/ban-types
function throttle(method) {
return throttleImpl(method);
}
exports.throttle = throttle;
// eslint-disable-next-line @typescript-eslint/ban-types
function throttleImpl(onAnimationFrameRequested, onBeforeIsRunningCheck, onAfterIsRunningCheck) {
var isRunning = false;
var func = function () {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
// don't use safeInvoke, because we might have more than its max number
// of typed params
if (functionUtils_1.isFunction(onBeforeIsRunningCheck)) {
onBeforeIsRunningCheck.apply(void 0, args);
}
if (isRunning) {
return;
}
isRunning = true;
if (functionUtils_1.isFunction(onAfterIsRunningCheck)) {
onAfterIsRunningCheck.apply(void 0, args);
}
requestAnimationFrame(function () {
onAnimationFrameRequested.apply(void 0, args);
isRunning = false;
});
};
return func;
}
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