b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
52 lines
1.4 KiB
JavaScript
Executable file
52 lines
1.4 KiB
JavaScript
Executable file
/* global SourceEvent */
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'use strict';
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/**
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* Event source for Stream. One Stream can collect events from multiple
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* sources, which pass different native events (not only DOM events)
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* to Stream.
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**/
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(function(exports) {
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var SettingSource = function(configs) {
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this.configs = {
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settings: configs.settings || []
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};
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this._collector = navigator.mozSettings.addObserver;
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this._decollector = navigator.mozSettings.removeObserver;
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this._forwardTo = null;
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// Some API you just can't bind it with the object,
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// but a function.
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this.onchange = this.onchange.bind(this);
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};
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SettingSource.prototype.start = function(forwardTo) {
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this.configs.settings.forEach((key) => {
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this._collector(key, this.onchange);
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});
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this._forwardTo = forwardTo;
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return this;
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};
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SettingSource.prototype.stop = function() {
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this._forwardTo = null;
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this.configs.settings.forEach((key) => {
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this._decollector(key, this.onchange);
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});
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return this;
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};
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/**
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* For forwarding to the target.
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* Would transform the original 'settingName' and 'settingValue' pair as
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* 'type' and 'detail', as the event formant.
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*/
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SettingSource.prototype.onchange = function(change) {
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if (this._forwardTo) {
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this._forwardTo(
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new SourceEvent(change.settingName, change.settingValue));
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}
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};
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exports.SettingSource = SettingSource;
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})(window);
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