62 lines
2.4 KiB
JavaScript
62 lines
2.4 KiB
JavaScript
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define([
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'../Core/defaultValue',
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'../Core/defined',
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'./ConstantProperty'
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], function(
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defaultValue,
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defined,
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ConstantProperty) {
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'use strict';
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function createProperty(name, privateName, subscriptionName, configurable, createPropertyCallback) {
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return {
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configurable : configurable,
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get : function() {
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return this[privateName];
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},
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set : function(value) {
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var oldValue = this[privateName];
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var subscription = this[subscriptionName];
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if (defined(subscription)) {
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subscription();
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this[subscriptionName] = undefined;
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}
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var hasValue = value !== undefined;
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if (hasValue && (!defined(value) || !defined(value.getValue)) && defined(createPropertyCallback)) {
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value = createPropertyCallback(value);
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}
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if (oldValue !== value) {
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this[privateName] = value;
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this._definitionChanged.raiseEvent(this, name, value, oldValue);
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}
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if (defined(value) && defined(value.definitionChanged)) {
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this[subscriptionName] = value.definitionChanged.addEventListener(function() {
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this._definitionChanged.raiseEvent(this, name, value, value);
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}, this);
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}
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}
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};
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}
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function createConstantProperty(value) {
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return new ConstantProperty(value);
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}
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/**
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* Used to consistently define all DataSources graphics objects.
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* This is broken into two functions because the Chrome profiler does a better
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* job of optimizing lookups if it notices that the string is constant throughout the function.
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* @private
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*/
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function createPropertyDescriptor(name, configurable, createPropertyCallback) {
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//Safari 8.0.3 has a JavaScript bug that causes it to confuse two variables and treat them as the same.
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//The two extra toString calls work around the issue.
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return createProperty(name, '_' + name.toString(), '_' + name.toString() + 'Subscription', defaultValue(configurable, false), defaultValue(createPropertyCallback, createConstantProperty));
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}
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return createPropertyDescriptor;
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});
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