forked from mirrors/gecko-dev
756 lines
24 KiB
JavaScript
756 lines
24 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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// This file is loaded into the browser window scope.
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/* eslint-env mozilla/browser-window */
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/**
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* Controls the "full zoom" setting and its site-specific preferences.
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*/
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var FullZoom = {
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// Identifies the setting in the content prefs database.
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name: "browser.content.full-zoom",
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// browser.zoom.siteSpecific preference cache
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_siteSpecificPref: undefined,
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// browser.zoom.updateBackgroundTabs preference cache
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updateBackgroundTabs: undefined,
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// This maps the browser to monotonically increasing integer
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// tokens. _browserTokenMap[browser] is increased each time the zoom is
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// changed in the browser. See _getBrowserToken and _ignorePendingZoomAccesses.
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_browserTokenMap: new WeakMap(),
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// Stores initial locations if we receive onLocationChange
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// events before we're initialized.
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_initialLocations: new WeakMap(),
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get siteSpecific() {
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if (this._siteSpecificPref === undefined) {
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this._siteSpecificPref = Services.prefs.getBoolPref(
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"browser.zoom.siteSpecific"
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);
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}
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return this._siteSpecificPref;
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},
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// nsISupports
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QueryInterface: ChromeUtils.generateQI([
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"nsIObserver",
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"nsIContentPrefObserver",
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"nsISupportsWeakReference",
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]),
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// Initialization & Destruction
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init: function FullZoom_init() {
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gBrowser.addEventListener("DoZoomEnlargeBy10", this);
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gBrowser.addEventListener("DoZoomReduceBy10", this);
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window.addEventListener("MozScaleGestureComplete", this);
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// Register ourselves with the service so we know when our pref changes.
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this._cps2 = Cc["@mozilla.org/content-pref/service;1"].getService(
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Ci.nsIContentPrefService2
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);
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this._cps2.addObserverForName(this.name, this);
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this.updateBackgroundTabs = Services.prefs.getBoolPref(
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"browser.zoom.updateBackgroundTabs"
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);
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// Listen for changes to the browser.zoom branch so we can enable/disable
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// updating background tabs and per-site saving and restoring of zoom levels.
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Services.prefs.addObserver("browser.zoom.", this, true);
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// If we received onLocationChange events for any of the current browsers
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// before we were initialized we want to replay those upon initialization.
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for (let browser of gBrowser.browsers) {
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if (this._initialLocations.has(browser)) {
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this.onLocationChange(...this._initialLocations.get(browser), browser);
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}
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}
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// This should be nulled after initialization.
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this._initialLocations = null;
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},
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destroy: function FullZoom_destroy() {
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Services.prefs.removeObserver("browser.zoom.", this);
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this._cps2.removeObserverForName(this.name, this);
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gBrowser.removeEventListener("DoZoomEnlargeBy10", this);
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gBrowser.removeEventListener("DoZoomReduceBy10", this);
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window.removeEventListener("MozScaleGestureComplete", this);
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},
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// Event Handlers
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// EventListener
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handleEvent: function FullZoom_handleEvent(event) {
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switch (event.type) {
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case "DoZoomEnlargeBy10":
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this.changeZoomBy(this._getTargetedBrowser(event), 0.1);
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break;
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case "DoZoomReduceBy10":
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this.changeZoomBy(this._getTargetedBrowser(event), -0.1);
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break;
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case "MozScaleGestureComplete": {
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let nonDefaultScalingZoom = event.detail != 1.0;
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this.updateCommands(nonDefaultScalingZoom);
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break;
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}
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}
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},
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// nsIObserver
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observe(aSubject, aTopic, aData) {
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switch (aTopic) {
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case "nsPref:changed":
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switch (aData) {
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case "browser.zoom.siteSpecific":
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// Invalidate pref cache.
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this._siteSpecificPref = undefined;
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break;
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case "browser.zoom.updateBackgroundTabs":
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this.updateBackgroundTabs = Services.prefs.getBoolPref(
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"browser.zoom.updateBackgroundTabs"
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);
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break;
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case "browser.zoom.full": {
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this.updateCommands();
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break;
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}
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}
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break;
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}
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},
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// nsIContentPrefObserver
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onContentPrefSet: function FullZoom_onContentPrefSet(
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aGroup,
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aName,
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aValue,
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aIsPrivate
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) {
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this._onContentPrefChanged(aGroup, aValue, aIsPrivate);
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},
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onContentPrefRemoved: function FullZoom_onContentPrefRemoved(
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aGroup,
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aName,
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aIsPrivate
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) {
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this._onContentPrefChanged(aGroup, undefined, aIsPrivate);
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},
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/**
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* Appropriately updates the zoom level after a content preference has
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* changed.
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*
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* @param aGroup The group of the changed preference.
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* @param aValue The new value of the changed preference. Pass undefined to
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* indicate the preference's removal.
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*/
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_onContentPrefChanged: function FullZoom__onContentPrefChanged(
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aGroup,
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aValue,
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aIsPrivate
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) {
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if (this._isNextContentPrefChangeInternal) {
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// Ignore changes that FullZoom itself makes. This works because the
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// content pref service calls callbacks before notifying observers, and it
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// does both in the same turn of the event loop.
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delete this._isNextContentPrefChangeInternal;
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return;
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}
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let browser = gBrowser.selectedBrowser;
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if (!browser.currentURI) {
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return;
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}
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if (this._isPDFViewer(browser)) {
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return;
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}
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let ctxt = this._loadContextFromBrowser(browser);
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let domain = this._cps2.extractDomain(browser.currentURI.spec);
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if (aGroup) {
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if (aGroup == domain && ctxt.usePrivateBrowsing == aIsPrivate) {
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this._applyPrefToZoom(aValue, browser);
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}
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return;
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}
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// If the current page doesn't have a site-specific preference, then its
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// zoom should be set to the new global preference now that the global
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// preference has changed.
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let hasPref = false;
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let token = this._getBrowserToken(browser);
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this._cps2.getByDomainAndName(browser.currentURI.spec, this.name, ctxt, {
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handleResult() {
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hasPref = true;
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},
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handleCompletion: () => {
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if (!hasPref && token.isCurrent) {
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this._applyPrefToZoom(undefined, browser);
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}
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},
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});
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},
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// location change observer
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/**
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* Called when the location of a tab changes.
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* When that happens, we need to update the current zoom level if appropriate.
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*
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* @param aURI
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* A URI object representing the new location.
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* @param aIsTabSwitch
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* Whether this location change has happened because of a tab switch.
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* @param aBrowser
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* (optional) browser object displaying the document
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*/
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onLocationChange: function FullZoom_onLocationChange(
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aURI,
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aIsTabSwitch,
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aBrowser
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) {
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let browser = aBrowser || gBrowser.selectedBrowser;
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// If we haven't been initialized yet but receive an onLocationChange
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// notification then let's store and replay it upon initialization.
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if (this._initialLocations) {
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this._initialLocations.set(browser, [aURI, aIsTabSwitch]);
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return;
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}
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// Ignore all pending async zoom accesses in the browser. Pending accesses
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// that started before the location change will be prevented from applying
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// to the new location.
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this._ignorePendingZoomAccesses(browser);
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if (!aURI || (aIsTabSwitch && !this._isSiteSpecific(browser))) {
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this._notifyOnLocationChange(browser);
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return;
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}
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if (aURI.spec == "about:blank") {
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if (
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!browser.contentPrincipal ||
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browser.contentPrincipal.isNullPrincipal
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) {
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// For an about:blank with a null principal, zooming any amount does not
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// make any sense - so simply do 100%.
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this._applyPrefToZoom(
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1,
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browser,
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this._notifyOnLocationChange.bind(this, browser)
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);
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} else {
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// If it's not a null principal, there may be content loaded into it,
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// so use the global pref. This will avoid a cps2 roundtrip if we've
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// already loaded the global pref once. Really, this should probably
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// use the contentPrincipal's origin if it's an http(s) principal.
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// (See bug 1457597)
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this._applyPrefToZoom(
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undefined,
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browser,
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this._notifyOnLocationChange.bind(this, browser)
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);
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}
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return;
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}
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// Media documents should always start at 1, and are not affected by prefs.
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if (!aIsTabSwitch && browser.isSyntheticDocument) {
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ZoomManager.setZoomForBrowser(browser, 1);
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// _ignorePendingZoomAccesses already called above, so no need here.
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this._notifyOnLocationChange(browser);
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return;
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}
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// The PDF viewer zooming isn't handled by `ZoomManager`, ensure that the
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// browser zoom level always gets reset to 100% on load (to prevent the
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// UI elements of the PDF viewer from being zoomed in/out on load).
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if (this._isPDFViewer(browser)) {
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this._applyPrefToZoom(
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1,
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browser,
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this._notifyOnLocationChange.bind(this, browser)
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);
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return;
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}
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// See if the zoom pref is cached.
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let ctxt = this._loadContextFromBrowser(browser);
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let pref = this._cps2.getCachedByDomainAndName(aURI.spec, this.name, ctxt);
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if (pref) {
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this._applyPrefToZoom(
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pref.value,
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browser,
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this._notifyOnLocationChange.bind(this, browser)
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);
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return;
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}
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// It's not cached, so we have to asynchronously fetch it.
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let value = undefined;
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let token = this._getBrowserToken(browser);
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this._cps2.getByDomainAndName(aURI.spec, this.name, ctxt, {
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handleResult(resultPref) {
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value = resultPref.value;
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},
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handleCompletion: () => {
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if (!token.isCurrent) {
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this._notifyOnLocationChange(browser);
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return;
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}
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this._applyPrefToZoom(
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value,
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browser,
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this._notifyOnLocationChange.bind(this, browser)
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);
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},
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});
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},
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// update state of zoom menu items
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/**
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* Updates the current windows Zoom commands for zooming in, zooming out
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* and resetting the zoom level.
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*
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* @param {boolean} [forceResetEnabled=false]
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* Set to true if the zoom reset command should be enabled regardless of
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* whether or not the ZoomManager.zoom level is at 1.0. This is specifically
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* for when using scaling zoom via the pinch gesture which doesn't cause
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* the ZoomManager.zoom level to change.
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* @returns Promise
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* @resolves undefined
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*/
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updateCommands: async function FullZoom_updateCommands(
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forceResetEnabled = false
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) {
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let zoomLevel = ZoomManager.zoom;
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let defaultZoomLevel = await ZoomUI.getGlobalValue();
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let reduceCmd = document.getElementById("cmd_fullZoomReduce");
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if (zoomLevel == ZoomManager.MIN) {
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reduceCmd.setAttribute("disabled", "true");
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} else {
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reduceCmd.removeAttribute("disabled");
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}
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let enlargeCmd = document.getElementById("cmd_fullZoomEnlarge");
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if (zoomLevel == ZoomManager.MAX) {
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enlargeCmd.setAttribute("disabled", "true");
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} else {
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enlargeCmd.removeAttribute("disabled");
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}
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let resetCmd = document.getElementById("cmd_fullZoomReset");
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if (zoomLevel == defaultZoomLevel && !forceResetEnabled) {
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resetCmd.setAttribute("disabled", "true");
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} else {
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resetCmd.removeAttribute("disabled");
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}
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let fullZoomCmd = document.getElementById("cmd_fullZoomToggle");
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if (!ZoomManager.useFullZoom) {
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fullZoomCmd.setAttribute("checked", "true");
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} else {
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fullZoomCmd.setAttribute("checked", "false");
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}
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},
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// Setting & Pref Manipulation
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sendMessageToPDFViewer(browser, name) {
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try {
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browser.sendMessageToActor(name, {}, "Pdfjs");
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} catch (ex) {
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console.error(ex);
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}
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},
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/**
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* If browser in reader mode sends message to reader in order to decrease font size,
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* Otherwise reduces the zoom level of the page in the current browser.
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*/
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async reduce() {
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let browser = gBrowser.selectedBrowser;
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if (browser.currentURI.spec.startsWith("about:reader")) {
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browser.sendMessageToActor("Reader:ZoomOut", {}, "AboutReader");
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} else if (this._isPDFViewer(browser)) {
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this.sendMessageToPDFViewer(browser, "PDFJS:ZoomOut");
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} else {
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ZoomManager.reduce();
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this._ignorePendingZoomAccesses(browser);
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await this._applyZoomToPref(browser);
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}
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},
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/**
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* If browser in reader mode sends message to reader in order to increase font size,
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* Otherwise enlarges the zoom level of the page in the current browser.
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*/
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async enlarge() {
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let browser = gBrowser.selectedBrowser;
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if (browser.currentURI.spec.startsWith("about:reader")) {
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browser.sendMessageToActor("Reader:ZoomIn", {}, "AboutReader");
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} else if (this._isPDFViewer(browser)) {
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this.sendMessageToPDFViewer(browser, "PDFJS:ZoomIn");
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} else {
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ZoomManager.enlarge();
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this._ignorePendingZoomAccesses(browser);
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await this._applyZoomToPref(browser);
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}
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},
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/**
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* If browser in reader mode sends message to reader in order to increase font size,
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* Otherwise enlarges the zoom level of the page in the current browser.
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* This function is not async like reduce/enlarge, because it is invoked by our
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* event handler. This means that the call to _applyZoomToPref is not awaited and
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* will happen asynchronously.
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*/
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changeZoomBy(aBrowser, aValue) {
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if (aBrowser.currentURI.spec.startsWith("about:reader")) {
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const message = aValue > 0 ? "Reader::ZoomIn" : "Reader:ZoomOut";
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aBrowser.sendMessageToActor(message, {}, "AboutReader");
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return;
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} else if (this._isPDFViewer(aBrowser)) {
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const message = aValue > 0 ? "PDFJS::ZoomIn" : "PDFJS:ZoomOut";
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this.sendMessageToPDFViewer(aBrowser, message);
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return;
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}
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let zoom = ZoomManager.getZoomForBrowser(aBrowser);
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zoom += aValue;
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if (zoom < ZoomManager.MIN) {
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zoom = ZoomManager.MIN;
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} else if (zoom > ZoomManager.MAX) {
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zoom = ZoomManager.MAX;
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}
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ZoomManager.setZoomForBrowser(aBrowser, zoom);
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this._ignorePendingZoomAccesses(aBrowser);
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this._applyZoomToPref(aBrowser);
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},
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/**
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* Sets the zoom level for the given browser to the given floating
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* point value, where 1 is the default zoom level.
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*/
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setZoom(value, browser = gBrowser.selectedBrowser) {
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if (this._isPDFViewer(browser)) {
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return;
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}
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ZoomManager.setZoomForBrowser(browser, value);
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this._ignorePendingZoomAccesses(browser);
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this._applyZoomToPref(browser);
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},
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/**
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* Sets the zoom level of the page in the given browser to the global zoom
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* level.
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*
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* @return A promise which resolves when the zoom reset has been applied.
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*/
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reset: function FullZoom_reset(browser = gBrowser.selectedBrowser) {
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let forceValue;
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if (browser.currentURI.spec.startsWith("about:reader")) {
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browser.sendMessageToActor("Reader:ResetZoom", {}, "AboutReader");
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} else if (this._isPDFViewer(browser)) {
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this.sendMessageToPDFViewer(browser, "PDFJS:ZoomReset");
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// Ensure that the UI elements of the PDF viewer won't be zoomed in/out
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// on reset, even if/when browser default zoom value is not set to 100%.
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forceValue = 1;
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}
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let token = this._getBrowserToken(browser);
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let result = ZoomUI.getGlobalValue().then(value => {
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if (token.isCurrent) {
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ZoomManager.setZoomForBrowser(browser, forceValue || value);
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this._ignorePendingZoomAccesses(browser);
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}
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});
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this._removePref(browser);
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return result;
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},
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/**
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* Called from the URL bar's inline zoom reset indicator button.
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*
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* @param {Event} event the click/keyboard event that triggered the call.
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*/
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resetFromURLBar(event) {
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if (event.button > 0) {
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return;
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}
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this.reset();
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this.resetScalingZoom();
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},
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resetScalingZoom: function FullZoom_resetScaling(
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browser = gBrowser.selectedBrowser
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) {
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browser.browsingContext?.resetScalingZoom();
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},
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/**
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* Set the zoom level for a given browser.
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*
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* Per nsPresContext::setFullZoom, we can set the zoom to its current value
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* without significant impact on performance, as the setting is only applied
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* if it differs from the current setting. In fact getting the zoom and then
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* checking ourselves if it differs costs more.
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*
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* And perhaps we should always set the zoom even if it was more expensive,
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* since nsDocumentViewer::SetTextZoom claims that child documents can have
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* a different text zoom (although it would be unusual), and it implies that
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* those child text zooms should get updated when the parent zoom gets set,
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* and perhaps the same is true for full zoom
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* (although nsDocumentViewer::SetFullZoom doesn't mention it).
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*
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* So when we apply new zoom values to the browser, we simply set the zoom.
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* We don't check first to see if the new value is the same as the current
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* one.
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*
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* @param aValue The zoom level value.
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* @param aBrowser The zoom is set in this browser. Required.
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* @param aCallback If given, it's asynchronously called when complete.
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*/
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_applyPrefToZoom: function FullZoom__applyPrefToZoom(
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aValue,
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aBrowser,
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aCallback
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) {
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// The browser is sometimes half-destroyed because this method is called
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// by content pref service callbacks, which themselves can be called at any
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// time, even after browsers are closed.
|
|
if (
|
|
!aBrowser.mInitialized ||
|
|
aBrowser.isSyntheticDocument ||
|
|
(!this._isSiteSpecific(aBrowser) && aBrowser.tabHasCustomZoom)
|
|
) {
|
|
this._executeSoon(aCallback);
|
|
return;
|
|
}
|
|
|
|
if (aValue !== undefined && this._isSiteSpecific(aBrowser)) {
|
|
ZoomManager.setZoomForBrowser(aBrowser, this._ensureValid(aValue));
|
|
this._ignorePendingZoomAccesses(aBrowser);
|
|
this._executeSoon(aCallback);
|
|
return;
|
|
}
|
|
|
|
// Above, we check if site-specific zoom is enabled before setting
|
|
// the tab browser zoom, however global zoom should work independent
|
|
// of the site-specific pref, so we do no checks here.
|
|
let token = this._getBrowserToken(aBrowser);
|
|
ZoomUI.getGlobalValue().then(value => {
|
|
if (token.isCurrent) {
|
|
ZoomManager.setZoomForBrowser(aBrowser, value);
|
|
this._ignorePendingZoomAccesses(aBrowser);
|
|
}
|
|
this._executeSoon(aCallback);
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Saves the zoom level of the page in the given browser to the content
|
|
* prefs store.
|
|
*
|
|
* @param browser The zoom of this browser will be saved. Required.
|
|
*/
|
|
_applyZoomToPref: function FullZoom__applyZoomToPref(browser) {
|
|
if (!this._isSiteSpecific(browser) || browser.isSyntheticDocument) {
|
|
// If site-specific zoom is disabled, we have called this function
|
|
// to adjust our tab's zoom level. It is now considered "custom"
|
|
// and we mark that here.
|
|
browser.tabHasCustomZoom = !this._isSiteSpecific(browser);
|
|
return null;
|
|
}
|
|
|
|
return new Promise(resolve => {
|
|
this._cps2.set(
|
|
browser.currentURI.spec,
|
|
this.name,
|
|
ZoomManager.getZoomForBrowser(browser),
|
|
this._loadContextFromBrowser(browser),
|
|
{
|
|
handleCompletion: () => {
|
|
this._isNextContentPrefChangeInternal = true;
|
|
resolve();
|
|
},
|
|
}
|
|
);
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Removes from the content prefs store the zoom level of the given browser.
|
|
*
|
|
* @param browser The zoom of this browser will be removed. Required.
|
|
*/
|
|
_removePref: function FullZoom__removePref(browser) {
|
|
if (browser.isSyntheticDocument) {
|
|
return;
|
|
}
|
|
let ctxt = this._loadContextFromBrowser(browser);
|
|
this._cps2.removeByDomainAndName(browser.currentURI.spec, this.name, ctxt, {
|
|
handleCompletion: () => {
|
|
this._isNextContentPrefChangeInternal = true;
|
|
},
|
|
});
|
|
},
|
|
|
|
// Utilities
|
|
|
|
/**
|
|
* Returns the zoom change token of the given browser. Asynchronous
|
|
* operations that access the given browser's zoom should use this method to
|
|
* capture the token before starting and use token.isCurrent to determine if
|
|
* it's safe to access the zoom when done. If token.isCurrent is false, then
|
|
* after the async operation started, either the browser's zoom was changed or
|
|
* the browser was destroyed, and depending on what the operation is doing, it
|
|
* may no longer be safe to set and get its zoom.
|
|
*
|
|
* @param browser The token of this browser will be returned.
|
|
* @return An object with an "isCurrent" getter.
|
|
*/
|
|
_getBrowserToken: function FullZoom__getBrowserToken(browser) {
|
|
let map = this._browserTokenMap;
|
|
if (!map.has(browser)) {
|
|
map.set(browser, 0);
|
|
}
|
|
return {
|
|
token: map.get(browser),
|
|
get isCurrent() {
|
|
// At this point, the browser may have been destructed and unbound but
|
|
// its outer ID not removed from the map because outer-window-destroyed
|
|
// hasn't been received yet. In that case, the browser is unusable, it
|
|
// has no properties, so return false. Check for this case by getting a
|
|
// property, say, docShell.
|
|
return map.get(browser) === this.token && browser.mInitialized;
|
|
},
|
|
};
|
|
},
|
|
|
|
/**
|
|
* Returns the browser that the supplied zoom event is associated with.
|
|
* @param event The zoom event.
|
|
* @return The associated browser element, if one exists, otherwise null.
|
|
*/
|
|
_getTargetedBrowser: function FullZoom__getTargetedBrowser(event) {
|
|
let target = event.originalTarget;
|
|
|
|
// With remote content browsers, the event's target is the browser
|
|
// we're looking for.
|
|
const XUL_NS =
|
|
"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
|
|
if (
|
|
window.XULElement.isInstance(target) &&
|
|
target.localName == "browser" &&
|
|
target.namespaceURI == XUL_NS
|
|
) {
|
|
return target;
|
|
}
|
|
|
|
// With in-process content browsers, the event's target is the content
|
|
// document.
|
|
if (target.nodeType == Node.DOCUMENT_NODE) {
|
|
return target.ownerGlobal.docShell.chromeEventHandler;
|
|
}
|
|
|
|
throw new Error("Unexpected zoom event source");
|
|
},
|
|
|
|
/**
|
|
* Increments the zoom change token for the given browser so that pending
|
|
* async operations know that it may be unsafe to access they zoom when they
|
|
* finish.
|
|
*
|
|
* @param browser Pending accesses in this browser will be ignored.
|
|
*/
|
|
_ignorePendingZoomAccesses: function FullZoom__ignorePendingZoomAccesses(
|
|
browser
|
|
) {
|
|
let map = this._browserTokenMap;
|
|
map.set(browser, (map.get(browser) || 0) + 1);
|
|
},
|
|
|
|
_ensureValid: function FullZoom__ensureValid(aValue) {
|
|
// Note that undefined is a valid value for aValue that indicates a known-
|
|
// not-to-exist value.
|
|
if (isNaN(aValue)) {
|
|
return 1;
|
|
}
|
|
|
|
if (aValue < ZoomManager.MIN) {
|
|
return ZoomManager.MIN;
|
|
}
|
|
|
|
if (aValue > ZoomManager.MAX) {
|
|
return ZoomManager.MAX;
|
|
}
|
|
|
|
return aValue;
|
|
},
|
|
|
|
// Whether to remember the site specific zoom level for this browser.
|
|
// This returns false when `browser.zoom.siteSpecific` is false or
|
|
// the browser has content loaded that should resist fingerprinting.
|
|
_isSiteSpecific(aBrowser) {
|
|
if (!this.siteSpecific) {
|
|
return false;
|
|
}
|
|
return (
|
|
!aBrowser?.browsingContext?.topWindowContext.shouldResistFingerprinting ||
|
|
!ChromeUtils.shouldResistFingerprinting(
|
|
"SiteSpecificZoom",
|
|
aBrowser?.browsingContext?.topWindowContext
|
|
.overriddenFingerprintingSettings
|
|
)
|
|
);
|
|
},
|
|
|
|
/**
|
|
* Gets the load context from the given Browser.
|
|
*
|
|
* @param Browser The Browser whose load context will be returned.
|
|
* @return The nsILoadContext of the given Browser.
|
|
*/
|
|
_loadContextFromBrowser: function FullZoom__loadContextFromBrowser(browser) {
|
|
return browser.loadContext;
|
|
},
|
|
|
|
/**
|
|
* Asynchronously broadcasts "browser-fullZoom:location-change" so that
|
|
* listeners can be notified when the zoom levels on those pages change.
|
|
* The notification is always asynchronous so that observers are guaranteed a
|
|
* consistent behavior.
|
|
*/
|
|
_notifyOnLocationChange: function FullZoom__notifyOnLocationChange(browser) {
|
|
this._executeSoon(function () {
|
|
Services.obs.notifyObservers(browser, "browser-fullZoom:location-change");
|
|
});
|
|
},
|
|
|
|
_executeSoon: function FullZoom__executeSoon(callback) {
|
|
if (!callback) {
|
|
return;
|
|
}
|
|
Services.tm.dispatchToMainThread(callback);
|
|
},
|
|
|
|
_isPDFViewer(browser) {
|
|
return !!(
|
|
browser.contentPrincipal.spec == "resource://pdf.js/web/viewer.html"
|
|
);
|
|
},
|
|
};
|