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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/. */
/**
* 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,
/**
* List of tab events we want to listen for.
*/
_tabEvents: ["TabClose", "TabSelect"],
init: function Thumbnails_init() {
PageThumbs.addExpirationFilter(this);
gBrowser.addTabsProgressListener(this);
Services.prefs.addObserver(this.PREF_DISK_CACHE_SSL, this, false);
this._sslDiskCacheEnabled =
Services.prefs.getBoolPref(this.PREF_DISK_CACHE_SSL);
this._tabEvents.forEach(function (aEvent) {
gBrowser.tabContainer.addEventListener(aEvent, this, false);
}, this);
this._timeouts = new WeakMap();
},
uninit: function Thumbnails_uninit() {
PageThumbs.removeExpirationFilter(this);
gBrowser.removeTabsProgressListener(this);
Services.prefs.removeObserver(this.PREF_DISK_CACHE_SSL, this);
this._tabEvents.forEach(function (aEvent) {
gBrowser.tabContainer.removeEventListener(aEvent, this, false);
}, 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._clearTimeout(aEvent.target.linkedBrowser);
break;
}
}
},
observe: function Thumbnails_observe() {
this._sslDiskCacheEnabled =
Services.prefs.getBoolPref(this.PREF_DISK_CACHE_SSL);
},
filterForThumbnailExpiration:
function Thumbnails_filterForThumbnailExpiration(aCallback) {
aCallback(this._topSiteURLs);
},
/**
* 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);
},
_capture: function Thumbnails_capture(aBrowser) {
// Only capture about:newtab top sites.
if (this._topSiteURLs.indexOf(aBrowser.currentURI.spec) == -1)
return;
this._shouldCapture(aBrowser, function (aResult) {
if (aResult) {
PageThumbs.captureAndStoreIfStale(aBrowser);
}
});
},
_delayedCapture: function Thumbnails_delayedCapture(aBrowser) {
if (this._timeouts.has(aBrowser))
clearTimeout(this._timeouts.get(aBrowser));
else
aBrowser.addEventListener("scroll", this, true);
let timeout = setTimeout(function () {
this._clearTimeout(aBrowser);
this._capture(aBrowser);
}.bind(this), this._captureDelayMS);
this._timeouts.set(aBrowser, timeout);
},
_shouldCapture: function Thumbnails_shouldCapture(aBrowser, aCallback) {
// Capture only if it's the currently selected tab.
if (aBrowser != gBrowser.selectedBrowser) {
aCallback(false);
return;
}
PageThumbs.shouldStoreThumbnail(aBrowser, aCallback);
},
get _topSiteURLs() {
return NewTabUtils.links.getLinks().reduce((urls, link) => {
if (link)
urls.push(link.url);
return urls;
}, []);
},
_clearTimeout: function Thumbnails_clearTimeout(aBrowser) {
if (this._timeouts.has(aBrowser)) {
aBrowser.removeEventListener("scroll", this, false);
clearTimeout(this._timeouts.get(aBrowser));
this._timeouts.delete(aBrowser);
}
}
};
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