143 lines
4.0 KiB
JavaScript
143 lines
4.0 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Keeps thumbnails of open web pages up-to-date.
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*/
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var gBrowserThumbnails = {
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/**
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* Pref that controls whether we can store SSL content on disk
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*/
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PREF_DISK_CACHE_SSL: "browser.cache.disk_cache_ssl",
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_captureDelayMS: 1000,
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/**
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* Used to keep track of disk_cache_ssl preference
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*/
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_sslDiskCacheEnabled: null,
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/**
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* Map of capture() timeouts assigned to their browsers.
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*/
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_timeouts: null,
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/**
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* List of tab events we want to listen for.
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*/
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_tabEvents: ["TabClose", "TabSelect"],
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init: function Thumbnails_init() {
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PageThumbs.addExpirationFilter(this);
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gBrowser.addTabsProgressListener(this);
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Services.prefs.addObserver(this.PREF_DISK_CACHE_SSL, this, false);
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this._sslDiskCacheEnabled =
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Services.prefs.getBoolPref(this.PREF_DISK_CACHE_SSL);
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this._tabEvents.forEach(function (aEvent) {
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gBrowser.tabContainer.addEventListener(aEvent, this, false);
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}, this);
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this._timeouts = new WeakMap();
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},
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uninit: function Thumbnails_uninit() {
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PageThumbs.removeExpirationFilter(this);
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gBrowser.removeTabsProgressListener(this);
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Services.prefs.removeObserver(this.PREF_DISK_CACHE_SSL, this);
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this._tabEvents.forEach(function (aEvent) {
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gBrowser.tabContainer.removeEventListener(aEvent, this, false);
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}, this);
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},
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handleEvent: function Thumbnails_handleEvent(aEvent) {
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switch (aEvent.type) {
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case "scroll":
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let browser = aEvent.currentTarget;
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if (this._timeouts.has(browser))
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this._delayedCapture(browser);
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break;
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case "TabSelect":
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this._delayedCapture(aEvent.target.linkedBrowser);
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break;
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case "TabClose": {
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this._clearTimeout(aEvent.target.linkedBrowser);
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break;
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}
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}
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},
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observe: function Thumbnails_observe() {
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this._sslDiskCacheEnabled =
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Services.prefs.getBoolPref(this.PREF_DISK_CACHE_SSL);
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},
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filterForThumbnailExpiration:
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function Thumbnails_filterForThumbnailExpiration(aCallback) {
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aCallback(this._topSiteURLs);
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},
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/**
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* State change progress listener for all tabs.
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*/
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onStateChange: function Thumbnails_onStateChange(aBrowser, aWebProgress,
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aRequest, aStateFlags, aStatus) {
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if (aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
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aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK)
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this._delayedCapture(aBrowser);
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},
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_capture: function Thumbnails_capture(aBrowser) {
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// Only capture about:newtab top sites.
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if (this._topSiteURLs.indexOf(aBrowser.currentURI.spec) == -1)
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return;
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this._shouldCapture(aBrowser, function (aResult) {
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if (aResult) {
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PageThumbs.captureAndStoreIfStale(aBrowser);
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}
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});
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},
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_delayedCapture: function Thumbnails_delayedCapture(aBrowser) {
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if (this._timeouts.has(aBrowser))
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clearTimeout(this._timeouts.get(aBrowser));
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else
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aBrowser.addEventListener("scroll", this, true);
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let timeout = setTimeout(function () {
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this._clearTimeout(aBrowser);
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this._capture(aBrowser);
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}.bind(this), this._captureDelayMS);
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this._timeouts.set(aBrowser, timeout);
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},
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_shouldCapture: function Thumbnails_shouldCapture(aBrowser, aCallback) {
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// Capture only if it's the currently selected tab.
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if (aBrowser != gBrowser.selectedBrowser) {
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aCallback(false);
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return;
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}
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PageThumbs.shouldStoreThumbnail(aBrowser, aCallback);
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},
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get _topSiteURLs() {
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return NewTabUtils.links.getLinks().reduce((urls, link) => {
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if (link)
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urls.push(link.url);
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return urls;
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}, []);
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},
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_clearTimeout: function Thumbnails_clearTimeout(aBrowser) {
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if (this._timeouts.has(aBrowser)) {
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aBrowser.removeEventListener("scroll", this, false);
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clearTimeout(this._timeouts.get(aBrowser));
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this._timeouts.delete(aBrowser);
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}
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}
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};
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