65 lines
2.7 KiB
JavaScript
65 lines
2.7 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.createObservable = void 0;
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var Observable = /** @class */ (function () {
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function Observable(win) {
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var _this = this;
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this._resolutionListener = function () { return _this._onResolutionChanged(); };
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this._resolutionMediaQueryList = null;
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this._observers = [];
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this._window = win;
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this._installResolutionListener();
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}
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Observable.prototype.dispose = function () {
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this._uninstallResolutionListener();
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this._window = null;
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};
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Object.defineProperty(Observable.prototype, "value", {
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get: function () {
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return this._window.devicePixelRatio;
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},
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enumerable: false,
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configurable: true
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});
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Observable.prototype.subscribe = function (next) {
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var _this = this;
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var observer = { next: next };
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this._observers.push(observer);
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return {
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unsubscribe: function () {
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_this._observers = _this._observers.filter(function (o) { return o !== observer; });
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},
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};
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};
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Observable.prototype._installResolutionListener = function () {
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if (this._resolutionMediaQueryList !== null) {
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throw new Error('Resolution listener is already installed');
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}
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var dppx = this._window.devicePixelRatio;
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this._resolutionMediaQueryList = this._window.matchMedia("all and (resolution: ".concat(dppx, "dppx)"));
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// IE and some versions of Edge do not support addEventListener/removeEventListener, and we are going to use the deprecated addListener/removeListener
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this._resolutionMediaQueryList.addListener(this._resolutionListener);
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};
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Observable.prototype._uninstallResolutionListener = function () {
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if (this._resolutionMediaQueryList !== null) {
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// IE and some versions of Edge do not support addEventListener/removeEventListener, and we are going to use the deprecated addListener/removeListener
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this._resolutionMediaQueryList.removeListener(this._resolutionListener);
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this._resolutionMediaQueryList = null;
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}
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};
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Observable.prototype._reinstallResolutionListener = function () {
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this._uninstallResolutionListener();
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this._installResolutionListener();
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};
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Observable.prototype._onResolutionChanged = function () {
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var _this = this;
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this._observers.forEach(function (observer) { return observer.next(_this._window.devicePixelRatio); });
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this._reinstallResolutionListener();
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};
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return Observable;
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}());
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function createObservable(win) {
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return new Observable(win);
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}
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exports.createObservable = createObservable;
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