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ClockViewModel.js
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ClockViewModel.js
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import Clock from "../Core/Clock.js";
import defined from "../Core/defined.js";
import destroyObject from "../Core/destroyObject.js";
import EventHelper from "../Core/EventHelper.js";
import JulianDate from "../Core/JulianDate.js";
import knockout from "../ThirdParty/knockout.js";
/**
* A view model which exposes a {@link Clock} for user interfaces.
* @alias ClockViewModel
* @constructor
*
* @param {Clock} [clock] The clock object wrapped by this view model, if undefined a new instance will be created.
*
* @see Clock
*/
function ClockViewModel(clock) {
if (!defined(clock)) {
clock = new Clock();
}
this._clock = clock;
this._eventHelper = new EventHelper();
this._eventHelper.add(clock.onTick, this.synchronize, this);
/**
* Gets the current system time.
* This property is observable.
* @type {JulianDate}
*/
this.systemTime = knockout.observable(JulianDate.now());
this.systemTime.equalityComparer = JulianDate.equals;
/**
* Gets or sets the start time of the clock.
* See {@link Clock#startTime}.
* This property is observable.
* @type {JulianDate}
*/
this.startTime = knockout.observable(clock.startTime);
this.startTime.equalityComparer = JulianDate.equals;
this.startTime.subscribe(function (value) {
clock.startTime = value;
this.synchronize();
}, this);
/**
* Gets or sets the stop time of the clock.
* See {@link Clock#stopTime}.
* This property is observable.
* @type {JulianDate}
*/
this.stopTime = knockout.observable(clock.stopTime);
this.stopTime.equalityComparer = JulianDate.equals;
this.stopTime.subscribe(function (value) {
clock.stopTime = value;
this.synchronize();
}, this);
/**
* Gets or sets the current time.
* See {@link Clock#currentTime}.
* This property is observable.
* @type {JulianDate}
*/
this.currentTime = knockout.observable(clock.currentTime);
this.currentTime.equalityComparer = JulianDate.equals;
this.currentTime.subscribe(function (value) {
clock.currentTime = value;
this.synchronize();
}, this);
/**
* Gets or sets the clock multiplier.
* See {@link Clock#multiplier}.
* This property is observable.
* @type {Number}
*/
this.multiplier = knockout.observable(clock.multiplier);
this.multiplier.subscribe(function (value) {
clock.multiplier = value;
this.synchronize();
}, this);
/**
* Gets or sets the clock step setting.
* See {@link Clock#clockStep}.
* This property is observable.
* @type {ClockStep}
*/
this.clockStep = knockout.observable(clock.clockStep);
this.clockStep.subscribe(function (value) {
clock.clockStep = value;
this.synchronize();
}, this);
/**
* Gets or sets the clock range setting.
* See {@link Clock#clockRange}.
* This property is observable.
* @type {ClockRange}
*/
this.clockRange = knockout.observable(clock.clockRange);
this.clockRange.subscribe(function (value) {
clock.clockRange = value;
this.synchronize();
}, this);
/**
* Gets or sets whether the clock can animate.
* See {@link Clock#canAnimate}.
* This property is observable.
* @type {Boolean}
*/
this.canAnimate = knockout.observable(clock.canAnimate);
this.canAnimate.subscribe(function (value) {
clock.canAnimate = value;
this.synchronize();
}, this);
/**
* Gets or sets whether the clock should animate.
* See {@link Clock#shouldAnimate}.
* This property is observable.
* @type {Boolean}
*/
this.shouldAnimate = knockout.observable(clock.shouldAnimate);
this.shouldAnimate.subscribe(function (value) {
clock.shouldAnimate = value;
this.synchronize();
}, this);
knockout.track(this, [
"systemTime",
"startTime",
"stopTime",
"currentTime",
"multiplier",
"clockStep",
"clockRange",
"canAnimate",
"shouldAnimate",
]);
}
Object.defineProperties(ClockViewModel.prototype, {
/**
* Gets the underlying Clock.
* @memberof ClockViewModel.prototype
* @type {Clock}
*/
clock: {
get: function () {
return this._clock;
},
},
});
/**
* Updates the view model with the contents of the underlying clock.
* Can be called to force an update of the viewModel if the underlying
* clock has changed and <code>Clock.tick</code> has not yet been called.
*/
ClockViewModel.prototype.synchronize = function () {
var clock = this._clock;
this.systemTime = JulianDate.now();
this.startTime = clock.startTime;
this.stopTime = clock.stopTime;
this.currentTime = clock.currentTime;
this.multiplier = clock.multiplier;
this.clockStep = clock.clockStep;
this.clockRange = clock.clockRange;
this.canAnimate = clock.canAnimate;
this.shouldAnimate = clock.shouldAnimate;
};
/**
* @returns {Boolean} true if the object has been destroyed, false otherwise.
*/
ClockViewModel.prototype.isDestroyed = function () {
return false;
};
/**
* Destroys the view model. Should be called to
* properly clean up the view model when it is no longer needed.
*/
ClockViewModel.prototype.destroy = function () {
this._eventHelper.removeAll();
destroyObject(this);
};
export default ClockViewModel;