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296 lines
9.8 KiB
JavaScript
Executable File
296 lines
9.8 KiB
JavaScript
Executable File
/*
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#ifdef 0
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Content Preferences (cpref).
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*
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* The Initial Developer of the Original Code is Mozilla.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Myk Melez <myk@mozilla.org>
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* Dão Gottwald <dao@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK *****
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#endif
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*/
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// From nsMouseScrollEvent::kIsHorizontal
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const MOUSE_SCROLL_IS_HORIZONTAL = 1 << 2;
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// One of the possible values for the mousewheel.* preferences.
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// From nsEventStateManager.cpp.
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const MOUSE_SCROLL_FULLZOOM = 5;
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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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//**************************************************************************//
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// Name & Values
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// The name of the setting. Identifies the setting in the prefs database.
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name: "browser.content.full-zoom",
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// The global value (if any) for the setting. Lazily loaded from the service
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// when first requested, then updated by the pref change listener as it changes.
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// If there is no global value, then this should be undefined.
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get globalValue FullZoom_get_globalValue() {
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var globalValue = this._cps.getPref(null, this.name);
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if (typeof globalValue != "undefined")
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globalValue = this._ensureValid(globalValue);
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delete this.globalValue;
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return this.globalValue = globalValue;
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},
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//**************************************************************************//
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// Convenience Getters
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// Content Pref Service
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get _cps FullZoom_get__cps() {
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delete this._cps;
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return this._cps = Cc["@mozilla.org/content-pref/service;1"].
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getService(Ci.nsIContentPrefService);
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},
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//**************************************************************************//
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// nsISupports
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// We can't use the Ci shortcut here because it isn't defined yet.
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interfaces: [Components.interfaces.nsIDOMEventListener,
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Components.interfaces.nsIContentPrefObserver,
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Components.interfaces.nsISupports],
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QueryInterface: function FullZoom_QueryInterface(aIID) {
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if (!this.interfaces.some(function (v) aIID.equals(v)))
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throw Cr.NS_ERROR_NO_INTERFACE;
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return this;
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},
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//**************************************************************************//
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// Initialization & Destruction
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init: function FullZoom_init() {
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// Listen for scrollwheel events so we can save scrollwheel-based changes.
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window.addEventListener("DOMMouseScroll", this, false);
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// Register ourselves with the service so we know when our pref changes.
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this._cps.addObserver(this.name, this);
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},
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destroy: function FullZoom_destroy() {
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this._cps.removeObserver(this.name, this);
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window.removeEventListener("DOMMouseScroll", this, false);
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delete this._cps;
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},
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//**************************************************************************//
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// Event Handlers
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// nsIDOMEventListener
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handleEvent: function FullZoom_handleEvent(event) {
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switch (event.type) {
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case "DOMMouseScroll":
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this._handleMouseScrolled(event);
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break;
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}
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},
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_handleMouseScrolled: function FullZoom__handleMouseScrolled(event) {
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// Construct the "mousewheel action" pref key corresponding to this event.
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// Based on nsEventStateManager::GetBasePrefKeyForMouseWheel.
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var pref = "mousewheel";
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if (event.scrollFlags & MOUSE_SCROLL_IS_HORIZONTAL)
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pref += ".horizscroll";
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if (event.shiftKey)
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pref += ".withshiftkey";
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else if (event.ctrlKey)
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pref += ".withcontrolkey";
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else if (event.altKey)
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pref += ".withaltkey";
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else if (event.metaKey)
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pref += ".withmetakey";
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else
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pref += ".withnokey";
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pref += ".action";
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// Don't do anything if this isn't a "zoom" scroll event.
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var isZoomEvent = false;
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try {
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isZoomEvent = (gPrefService.getIntPref(pref) == MOUSE_SCROLL_FULLZOOM);
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} catch (e) {}
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if (!isZoomEvent)
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return;
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// XXX Lazily cache all the possible action prefs so we don't have to get
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// them anew from the pref service for every scroll event? We'd have to
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// make sure to observe them so we can update the cache when they change.
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// We have to call _applySettingToPref in a timeout because we handle
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// the event before the event state manager has a chance to apply the zoom
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// during nsEventStateManager::PostHandleEvent.
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window.setTimeout(function (self) { self._applySettingToPref() }, 0, this);
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},
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// nsIContentPrefObserver
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onContentPrefSet: function FullZoom_onContentPrefSet(aGroup, aName, aValue) {
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if (aGroup == this._cps.grouper.group(gBrowser.currentURI))
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this._applyPrefToSetting(aValue);
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else if (aGroup == null) {
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this.globalValue = this._ensureValid(aValue);
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// If the current page doesn't have a site-specific preference,
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// then its zoom should be set to the new global preference now that
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// the global preference has changed.
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if (!this._cps.hasPref(gBrowser.currentURI, this.name))
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this._applyPrefToSetting();
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}
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},
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onContentPrefRemoved: function FullZoom_onContentPrefRemoved(aGroup, aName) {
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if (aGroup == this._cps.grouper.group(gBrowser.currentURI))
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this._applyPrefToSetting();
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else if (aGroup == null) {
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this.globalValue = undefined;
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// If the current page doesn't have a site-specific preference,
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// then its zoom should be set to the default preference now that
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// the global preference has changed.
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if (!this._cps.hasPref(gBrowser.currentURI, this.name))
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this._applyPrefToSetting();
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}
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},
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// location change observer
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onLocationChange: function FullZoom_onLocationChange(aURI) {
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if (!aURI)
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return;
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this._applyPrefToSetting(this._cps.getPref(aURI, this.name));
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},
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//**************************************************************************//
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// Setting & Pref Manipulation
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reduce: function FullZoom_reduce() {
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ZoomManager.reduce();
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this._applySettingToPref();
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},
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enlarge: function FullZoom_enlarge() {
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ZoomManager.enlarge();
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this._applySettingToPref();
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},
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reset: function FullZoom_reset() {
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if (typeof this.globalValue != "undefined")
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ZoomManager.fullZoom = this.globalValue;
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else
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ZoomManager.reset();
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this._removePref();
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},
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setSettingValue: function FullZoom_setSettingValue() {
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var value = this._cps.getPref(gBrowser.currentURI, this.name);
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this._applyPrefToSetting(value);
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},
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/**
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* Set the zoom level for the current tab.
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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 DocumentViewerImpl::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 DocumentViewerImpl::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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_applyPrefToSetting: function FullZoom__applyPrefToSetting(aValue) {
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if (gInPrintPreviewMode)
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return;
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try {
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if (typeof aValue != "undefined")
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ZoomManager.fullZoom = this._ensureValid(aValue);
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else if (typeof this.globalValue != "undefined")
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ZoomManager.fullZoom = this.globalValue;
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else
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ZoomManager.fullZoom = 1;
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}
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catch(ex) {}
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},
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_applySettingToPref: function FullZoom__applySettingToPref() {
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if (gInPrintPreviewMode)
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return;
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var fullZoom = ZoomManager.fullZoom;
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this._cps.setPref(gBrowser.currentURI, this.name, fullZoom);
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},
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_removePref: function FullZoom__removePref() {
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this._cps.removePref(gBrowser.currentURI, this.name);
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},
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//**************************************************************************//
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// Utilities
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_ensureValid: function FullZoom__ensureValid(aValue) {
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if (isNaN(aValue))
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return 1;
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if (aValue < ZoomManager.MIN)
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return ZoomManager.MIN;
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if (aValue > ZoomManager.MAX)
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return ZoomManager.MAX;
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return aValue;
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}
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};
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