@swimlane/ngx-graph
Version:
Graph visualization for angular
69 lines • 6.36 kB
JavaScript
/**
* Throttle a function
*
* @export
* @param {*} func
* @param {number} wait
* @param {*} [options]
* @returns
*/
export function throttle(context, func, wait, options) {
options = options || {};
let args;
let result;
let timeout = null;
let previous = 0;
function later() {
previous = options.leading === false ? 0 : +new Date();
timeout = null;
result = func.apply(context, args);
}
return function (..._arguments) {
const now = +new Date();
if (!previous && options.leading === false) {
previous = now;
}
const remaining = wait - (now - previous);
args = _arguments;
if (remaining <= 0) {
clearTimeout(timeout);
timeout = null;
previous = now;
result = func.apply(context, args);
}
else if (!timeout && options.trailing !== false) {
timeout = setTimeout(later, remaining);
}
return result;
};
}
/**
* Throttle decorator
*
* class MyClass {
* throttleable(10)
* myFn() { ... }
* }
*
* @export
* @param {number} duration
* @param {*} [options]
* @returns
*/
export function throttleable(duration, options) {
return function innerDecorator(target, key, descriptor) {
return {
configurable: true,
enumerable: descriptor.enumerable,
get: function getter() {
Object.defineProperty(this, key, {
configurable: true,
enumerable: descriptor.enumerable,
value: throttle(this, descriptor.value, duration, options)
});
return this[key];
}
};
};
}
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