141 lines
5.8 KiB
JavaScript
141 lines
5.8 KiB
JavaScript
/**
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* @license
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* Copyright 2021 Google Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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import { __extends, __read, __spreadArray, __values } from "tslib";
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import { MDCFoundation } from './foundation';
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import { observeProperty, setObserversEnabled } from './observer';
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var MDCObserverFoundation = /** @class */ (function (_super) {
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__extends(MDCObserverFoundation, _super);
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function MDCObserverFoundation(adapter) {
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var _this = _super.call(this, adapter) || this;
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/** A set of cleanup functions to unobserve changes. */
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_this.unobserves = new Set();
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return _this;
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}
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MDCObserverFoundation.prototype.destroy = function () {
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_super.prototype.destroy.call(this);
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this.unobserve();
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};
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/**
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* Observe a target's properties for changes using the provided map of
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* property names and observer functions.
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*
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* @template T The target type.
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* @param target - The target to observe.
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* @param observers - An object whose keys are target properties and values
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* are observer functions that are called when the associated property
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* changes.
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* @return A cleanup function that can be called to unobserve the
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* target.
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*/
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MDCObserverFoundation.prototype.observe = function (target, observers) {
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var e_1, _a;
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var _this = this;
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var cleanup = [];
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try {
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for (var _b = __values(Object.keys(observers)), _c = _b.next(); !_c.done; _c = _b.next()) {
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var property = _c.value;
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var observer = observers[property].bind(this);
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cleanup.push(this.observeProperty(target, property, observer));
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}
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}
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catch (e_1_1) { e_1 = { error: e_1_1 }; }
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finally {
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try {
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if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
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}
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finally { if (e_1) throw e_1.error; }
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}
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var unobserve = function () {
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var e_2, _a;
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try {
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for (var cleanup_1 = __values(cleanup), cleanup_1_1 = cleanup_1.next(); !cleanup_1_1.done; cleanup_1_1 = cleanup_1.next()) {
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var cleanupFn = cleanup_1_1.value;
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cleanupFn();
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}
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}
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catch (e_2_1) { e_2 = { error: e_2_1 }; }
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finally {
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try {
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if (cleanup_1_1 && !cleanup_1_1.done && (_a = cleanup_1.return)) _a.call(cleanup_1);
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}
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finally { if (e_2) throw e_2.error; }
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}
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_this.unobserves.delete(unobserve);
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};
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this.unobserves.add(unobserve);
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return unobserve;
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};
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/**
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* Observe a target's property for changes. When a property changes, the
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* provided `Observer` function will be invoked with the properties current
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* and previous values.
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*
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* The returned cleanup function will stop listening to changes for the
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* provided `Observer`.
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*
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* @template T The observed target type.
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* @template K The observed property.
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* @param target - The target to observe.
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* @param property - The property of the target to observe.
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* @param observer - An observer function to invoke each time the property
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* changes.
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* @return A cleanup function that will stop observing changes for the
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* provided `Observer`.
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*/
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MDCObserverFoundation.prototype.observeProperty = function (target, property, observer) {
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return observeProperty(target, property, observer);
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};
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/**
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* Enables or disables all observers for the provided target. Disabling
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* observers will prevent them from being called until they are re-enabled.
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*
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* @param target - The target to enable or disable observers for.
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* @param enabled - Whether or not observers should be called.
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*/
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MDCObserverFoundation.prototype.setObserversEnabled = function (target, enabled) {
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setObserversEnabled(target, enabled);
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};
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/**
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* Clean up all observers and stop listening for property changes.
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*/
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MDCObserverFoundation.prototype.unobserve = function () {
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var e_3, _a;
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try {
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// Iterate over a copy since unobserve() will remove themselves from the set
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for (var _b = __values(__spreadArray([], __read(this.unobserves))), _c = _b.next(); !_c.done; _c = _b.next()) {
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var unobserve = _c.value;
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unobserve();
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}
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}
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catch (e_3_1) { e_3 = { error: e_3_1 }; }
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finally {
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try {
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if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
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}
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finally { if (e_3) throw e_3.error; }
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}
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};
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return MDCObserverFoundation;
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}(MDCFoundation));
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export { MDCObserverFoundation };
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//# sourceMappingURL=observer-foundation.js.map
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