b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
74 lines
2.6 KiB
JavaScript
74 lines
2.6 KiB
JavaScript
/* global BaseIcon */
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'use strict';
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(function(exports) {
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var DownloadIcon = function(manager) {
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this.systemDownloads = {};
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this.downloadsCount = 0;
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BaseIcon.call(this, manager);
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};
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DownloadIcon.prototype = Object.create(BaseIcon.prototype);
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DownloadIcon.prototype.name = 'DownloadIcon';
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DownloadIcon.prototype.handle = function(download) {
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// New download, track it so we can show or hide the active downloads
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// indicator. If you think this logic needs to change, think really hard
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// about it and then come and ask @nullaus
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download.onstatechange = function(downloadEvent) {
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var download = downloadEvent.download;
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switch (download.state) {
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case 'downloading':
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// If this download has not already been tracked as actively
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// downloading we'll add it to our list and increment the
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// downloads counter.
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if (!this.systemDownloads[download.id]) {
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this.incDownloads();
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this.systemDownloads[download.id] = true;
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}
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break;
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// Once the download is finalized, and only then, is it safe to
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// remove our state change listener. If we remove it before then
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// we are likely to miss paused or errored downloads being restarted
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case 'finalized':
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download.onstatechange = null;
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this.update();
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break;
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// All other state changes indicate the download is no longer
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// active, if we were previously tracking the download as active
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// we'll decrement the counter now and remove it from active
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// download status.
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case 'stopped':
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case 'succeeded':
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if (this.systemDownloads[download.id]) {
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this.decDownloads();
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delete this.systemDownloads[download.id];
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}
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break;
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default:
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console.warn('Unexpected download state = ', download.state);
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}
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}.bind(this);
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};
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DownloadIcon.prototype.incDownloads = function() {
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this.downloadsCount++;
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this.update();
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};
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DownloadIcon.prototype.decDownloads = function() {
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if (--this.downloadsCount < 0) {
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this.downloadsCount = 0;
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}
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this.update();
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};
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DownloadIcon.prototype.shouldDisplay = function() {
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return this.downloadsCount !== 0;
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};
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DownloadIcon.prototype.view = function view() {
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return `<!-- See note on <img> above. -->
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<img id="statusbar-download"
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src="style/statusbar/images/system-downloads.png"
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class="sb-icon-download" hidden role="listitem"
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data-l10n-id="statusbarDownload">`;
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};
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exports.DownloadIcon = DownloadIcon;
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}(window));
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