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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// This file is loaded into the browser window scope.
/* eslint-env mozilla/browser-window */
/**
* Keeps thumbnails of open web pages up-to-date.
*/
var gBrowserThumbnails = {
/**
* Pref that controls whether we can store SSL content on disk
*/
PREF_DISK_CACHE_SSL: "browser.cache.disk_cache_ssl",
_captureDelayMS: 1000,
/**
* Used to keep track of disk_cache_ssl preference
*/
_sslDiskCacheEnabled: null,
/**
* Map of capture() timeouts assigned to their browsers.
*/
_timeouts: null,
/**
* Top site URLs refresh timer.
*/
_topSiteURLsRefreshTimer: null,
/**
* List of tab events we want to listen for.
*/
_tabEvents: ["TabClose", "TabSelect"],
init: function Thumbnails_init() {
gBrowser.addTabsProgressListener(this);
Services.prefs.addObserver(this.PREF_DISK_CACHE_SSL, this);
this._sslDiskCacheEnabled = Services.prefs.getBoolPref(
this.PREF_DISK_CACHE_SSL
);
this._tabEvents.forEach(function(aEvent) {
gBrowser.tabContainer.addEventListener(aEvent, this);
}, this);
this._timeouts = new WeakMap();
},
uninit: function Thumbnails_uninit() {
gBrowser.removeTabsProgressListener(this);
Services.prefs.removeObserver(this.PREF_DISK_CACHE_SSL, this);
if (this._topSiteURLsRefreshTimer) {
this._topSiteURLsRefreshTimer.cancel();
this._topSiteURLsRefreshTimer = null;
}
this._tabEvents.forEach(function(aEvent) {
gBrowser.tabContainer.removeEventListener(aEvent, this);
}, this);
},
handleEvent: function Thumbnails_handleEvent(aEvent) {
switch (aEvent.type) {
case "scroll":
let browser = aEvent.currentTarget;
if (this._timeouts.has(browser)) {
this._delayedCapture(browser);
}
break;
case "TabSelect":
this._delayedCapture(aEvent.target.linkedBrowser);
break;
case "TabClose": {
this._cancelDelayedCapture(aEvent.target.linkedBrowser);
break;
}
}
},
observe: function Thumbnails_observe(subject, topic, data) {
switch (data) {
case this.PREF_DISK_CACHE_SSL:
this._sslDiskCacheEnabled = Services.prefs.getBoolPref(
this.PREF_DISK_CACHE_SSL
);
break;
}
},
clearTopSiteURLCache: function Thumbnails_clearTopSiteURLCache() {
if (this._topSiteURLsRefreshTimer) {
this._topSiteURLsRefreshTimer.cancel();
this._topSiteURLsRefreshTimer = null;
}
// Delete the defined property
delete this._topSiteURLs;
XPCOMUtils.defineLazyGetter(this, "_topSiteURLs", getTopSiteURLs);
},
notify: function Thumbnails_notify(timer) {
gBrowserThumbnails._topSiteURLsRefreshTimer = null;
gBrowserThumbnails.clearTopSiteURLCache();
},
/**
* State change progress listener for all tabs.
*/
onStateChange: function Thumbnails_onStateChange(
aBrowser,
aWebProgress,
aRequest,
aStateFlags,
aStatus
) {
if (
aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK
) {
this._delayedCapture(aBrowser);
}
},
async _capture(aBrowser) {
// Only capture about:newtab top sites.
const topSites = await this._topSiteURLs;
if (!aBrowser.currentURI || !topSites.includes(aBrowser.currentURI.spec)) {
return;
}
if (await this._shouldCapture(aBrowser)) {
await PageThumbs.captureAndStoreIfStale(aBrowser);
}
},
_delayedCapture: function Thumbnails_delayedCapture(aBrowser) {
if (this._timeouts.has(aBrowser)) {
this._cancelDelayedCallbacks(aBrowser);
} else {
aBrowser.addEventListener("scroll", this, true);
}
let idleCallback = () => {
this._cancelDelayedCapture(aBrowser);
this._capture(aBrowser);
};
// setTimeout to set a guarantee lower bound for the requestIdleCallback
// (and therefore the delayed capture)
let timeoutId = setTimeout(() => {
let idleCallbackId = requestIdleCallback(idleCallback, {
timeout: this._captureDelayMS * 30,
});
this._timeouts.set(aBrowser, { isTimeout: false, id: idleCallbackId });
}, this._captureDelayMS);
this._timeouts.set(aBrowser, { isTimeout: true, id: timeoutId });
},
_shouldCapture: async function Thumbnails_shouldCapture(aBrowser) {
// Capture only if it's the currently selected tab and not an about: page.
if (
aBrowser != gBrowser.selectedBrowser ||
gBrowser.currentURI.schemeIs("about")
) {
return false;
}
return PageThumbs.shouldStoreThumbnail(aBrowser);
},
_cancelDelayedCapture: function Thumbnails_cancelDelayedCapture(aBrowser) {
if (this._timeouts.has(aBrowser)) {
aBrowser.removeEventListener("scroll", this);
this._cancelDelayedCallbacks(aBrowser);
this._timeouts.delete(aBrowser);
}
},
_cancelDelayedCallbacks: function Thumbnails_cancelDelayedCallbacks(
aBrowser
) {
let timeoutData = this._timeouts.get(aBrowser);
if (timeoutData.isTimeout) {
clearTimeout(timeoutData.id);
} else {
// idle callback dispatched
window.cancelIdleCallback(timeoutData.id);
}
},
};
async function getTopSiteURLs() {
// The _topSiteURLs getter can be expensive to run, but its return value can
// change frequently on new profiles, so as a compromise we cache its return
// value as a lazy getter for 1 minute every time it's called.
gBrowserThumbnails._topSiteURLsRefreshTimer = Cc[
"@mozilla.org/timer;1"
].createInstance(Ci.nsITimer);
gBrowserThumbnails._topSiteURLsRefreshTimer.initWithCallback(
gBrowserThumbnails,
60 * 1000,
Ci.nsITimer.TYPE_ONE_SHOT
);
let sites = [];
// Get both the top sites returned by the query, and also any pinned sites
// that the user might have added manually that also need a screenshot.
// Also include top sites that don't have rich icons
let topSites = await NewTabUtils.activityStreamLinks.getTopSites();
sites.push(...topSites.filter(link => !(link.faviconSize >= 96)));
sites.push(...NewTabUtils.pinnedLinks.links);
return sites.reduce((urls, link) => {
if (link) {
urls.push(link.url);
}
return urls;
}, []);
}
XPCOMUtils.defineLazyGetter(gBrowserThumbnails, "_topSiteURLs", getTopSiteURLs);
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