@mezzy/commands/src/throttlingCommand.js

A luxurious user experience framework, developed by your friends at Mezzanine.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const is_1 = require("@mezzy/is");
const result_1 = require("@mezzy/result");
const command_1 = require("./command");
class ThrottlingCommand extends command_1.default {
    constructor(runFunction, undoFunction, scope, delayInMilliseconds = 250) {
        super(runFunction, undoFunction, scope);
        this._last = 0;
        this.delayInMilliseconds = delayInMilliseconds;
    }
    debounce(...args) {
        if (is_1.default.empty(this.runFunction))
            return result_1.Result.resolve(null);
        if (is_1.default.notEmpty(args) && args.length > 0)
            this.runArgs = args;
        if (is_1.default.notEmpty(this._timeout))
            clearTimeout(this._timeout);
        let returnValue;
        let resultReturnValue = new result_1.Result();
        if (this.delayInMilliseconds <= 0) {
            returnValue = this.runFunction.apply(this.scope, this.runArgs);
            if (returnValue instanceof result_1.Result)
                returnValue.then((value) => resultReturnValue.resolve(value));
            else
                resultReturnValue.resolve(returnValue);
        }
        else
            this._timeout = setTimeout(() => {
                returnValue = this.runFunction.apply(this.scope, this.runArgs);
                if (returnValue instanceof result_1.Result)
                    returnValue.then((value) => resultReturnValue.resolve(value));
                else
                    resultReturnValue.resolve(returnValue);
            }, this.delayInMilliseconds);
        return resultReturnValue;
    }
    throttle(...args) {
        if (is_1.default.empty(this.runFunction))
            return result_1.Result.resolve(null);
        if (is_1.default.notEmpty(args) && args.length > 0)
            this.runArgs = args;
        let returnValue;
        let resultReturnValue = new result_1.Result();
        let now = +new Date;
        if (this._last > 0 && now < this._last + this.delayInMilliseconds) {
            if (is_1.default.notEmpty(this._timeout))
                clearTimeout(this._timeout);
            this._timeout = setTimeout(() => {
                this._last = now;
                returnValue = this.runFunction.apply(this.scope, this.runArgs);
                if (returnValue instanceof result_1.Result)
                    returnValue.then((value) => resultReturnValue.resolve(value));
                else
                    resultReturnValue.resolve(returnValue);
            }, this.delayInMilliseconds);
        }
        else {
            this._last = now;
            returnValue = this.runFunction.apply(this.scope, this.runArgs);
            if (returnValue instanceof result_1.Result)
                returnValue.then((value) => resultReturnValue.resolve(value));
            else
                resultReturnValue.resolve(returnValue);
        }
        return resultReturnValue;
    }
}
exports.ThrottlingCommand = ThrottlingCommand;
exports.default = ThrottlingCommand;
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