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332 lines
11 KiB
JavaScript
Executable File
332 lines
11 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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*
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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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// Not sure where this comes from. It's one of the possible values
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// for the mousewheel.* preferences.
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const MOUSE_SCROLL_TEXTSIZE = 3;
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/**
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* Controls the "text zoom" setting and its site-specific preferences.
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*/
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var TextZoom = {
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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.text-zoom",
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// The global value (if any) for the setting. Retrieved from the prefs
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// database when this handler gets initialized, then updated as it changes.
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// If there is no global value, then this should be undefined.
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globalValue: undefined,
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// From viewZoomOverlay.js
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minValue: 1,
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maxValue: 2000,
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defaultValue: 100,
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//**************************************************************************//
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// Convenience Getters
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__zoomManager: null,
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get _zoomManager() {
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if (!this.__zoomManager)
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this.__zoomManager = ZoomManager.prototype.getInstance();
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return this.__zoomManager;
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},
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// Content Pref Service
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__cps: null,
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get _cps() {
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if (!this.__cps)
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this.__cps = Cc["@mozilla.org/content-pref/service;1"].
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getService(Ci.nsIContentPrefService);
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return this.__cps;
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},
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// Pref Branch
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__prefBranch: null,
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get _prefBranch() {
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if (!this.__prefBranch)
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this.__prefBranch = Cc["@mozilla.org/preferences-service;1"].
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getService(Ci.nsIPrefBranch);
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return this.__prefBranch;
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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 TextZoom_QueryInterface(aIID) {
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if (!this.interfaces.some( function(v) { return 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 TextZoom_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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// Register ourselves with the sink so we know when the location changes.
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var globalValue = ContentPrefSink.addObserver(this.name, this);
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this.globalValue = this._ensureValid(globalValue);
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// Set the initial value of the setting.
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this._applyPrefToSetting();
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},
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destroy: function TextZoom_destroy() {
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ContentPrefSink.removeObserver(this.name, this);
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this._cps.removeObserver(this.name, this);
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window.removeEventListener("DOMMouseScroll", this, false);
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// Delete references to XPCOM components to make sure we don't leak them
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// (although we haven't observed leakage in tests).
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for (var i in this) {
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try { this[i] = null }
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// Ignore "setting a property that has only a getter" exceptions.
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catch(ex) {}
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}
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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 TextZoom_handleEvent(event) {
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// The only events we handle are DOMMouseScroll events.
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this._handleMouseScrolled(event);
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},
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_handleMouseScrolled: function TextZoom__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 "change text size" scroll event.
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if (this._getAppPref(pref, null) != MOUSE_SCROLL_TEXTSIZE)
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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() { TextZoom._applySettingToPref() }, 0);
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},
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// nsIContentPrefObserver
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onContentPrefSet: function TextZoom_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 TextZoom_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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// ContentPrefSink observer
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onLocationChanged: function TextZoom_onLocationChanged(aURI, aName, aValue) {
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this._applyPrefToSetting(aValue);
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},
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//**************************************************************************//
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// Setting & Pref Manipulation
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reduce: function TextZoom_reduce() {
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this._zoomManager.reduce();
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this._applySettingToPref();
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},
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enlarge: function TextZoom_enlarge() {
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this._zoomManager.enlarge();
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this._applySettingToPref();
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},
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reset: function TextZoom_reset() {
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if (typeof this.globalValue != "undefined")
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this._zoomManager.textZoom = this.globalValue;
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else
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this._zoomManager.reset();
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this._removePref();
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},
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/**
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* Set the text zoom for the current tab.
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*
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* Per DocumentViewerImpl::SetTextZoom in nsDocumentViewer.cpp, it looks
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* like we can set the zoom to its current value without significant impact
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* on performance, as the setting is only applied if it differs from the
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* current setting.
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*
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* And perhaps we should always set the zoom even if it were to incur
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* a performance penalty, since SetTextZoom claims that child documents
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* may have a different zoom under unusual circumstances, and it implies
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* that those child zooms should get updated when the parent zoom gets set.
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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 TextZoom__applyPrefToSetting(aValue) {
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// Bug 375918 means this will sometimes throw, so we catch it
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// and don't do anything in those cases.
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try {
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if (typeof aValue != "undefined")
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this._zoomManager.textZoom = this._ensureValid(aValue);
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else if (typeof this.globalValue != "undefined")
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this._zoomManager.textZoom = this.globalValue;
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else
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this._zoomManager.reset();
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}
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catch(ex) {}
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},
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_applySettingToPref: function TextZoom__applySettingToPref() {
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var textZoom = this._zoomManager.textZoom;
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this._cps.setPref(gBrowser.currentURI, this.name, textZoom);
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},
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_removePref: function TextZoom__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 TextZoom__ensureValid(aValue) {
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if (isNaN(aValue))
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return this.defaultValue;
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if (aValue < this.minValue)
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return this.minValue;
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if (aValue > this.maxValue)
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return this.maxValue;
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return aValue;
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},
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/**
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* Get a value from a pref or a default value if the pref doesn't exist.
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*
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* @param aPrefName
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* @param aDefaultValue
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* @returns the pref's value or the default (if it is missing)
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*/
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_getAppPref: function TextZoom__getAppPref(aPrefName, aDefaultValue) {
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try {
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switch (this._prefBranch.getPrefType(aPrefName)) {
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case this._prefBranch.PREF_STRING:
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return this._prefBranch.getCharPref(aPrefName);
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case this._prefBranch.PREF_BOOL:
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return this._prefBranch.getBoolPref(aPrefName);
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case this._prefBranch.PREF_INT:
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return this._prefBranch.getIntPref(aPrefName);
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}
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}
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catch (ex) { /* return the default value */ }
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return aDefaultValue;
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}
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};
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