toolkit/content/viewZoomOverlay.js

   1 # -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2 #
   3 # ***** BEGIN LICENSE BLOCK *****
   4 # Version: MPL 1.1/GPL 2.0/LGPL 2.1
   5 #
   6 # The contents of this file are subject to the Mozilla Public License Version
   7 # 1.1 (the "License"); you may not use this file except in compliance with
   8 # the License. You may obtain a copy of the License at
   9 # http://www.mozilla.org/MPL/
  10 #
  11 # Software distributed under the License is distributed on an "AS IS" basis,
  12 # WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  13 # for the specific language governing rights and limitations under the
  14 # License.
  15 #
  16 # The Original Code is this file as it was released upon January 6, 2001.
  17 #
  18 # The Initial Developer of the Original Code is
  19 # Peter Annema.
  20 # Portions created by the Initial Developer are Copyright (C) 2000
  21 # the Initial Developer. All Rights Reserved.
  22 #
  23 # Contributor(s):
  24 #   Peter Annema <disttsc@bart.nl> (Original Author)
  25 #   Jonas Sicking <sicking@bigfoot.com>
  26 #   Jason Barnabe <jason_barnabe@fastmail.fm>
  27 #   Dão Gottwald <dao@mozilla.com>
  28 #
  29 # Alternatively, the contents of this file may be used under the terms of
  30 # either the GNU General Public License Version 2 or later (the "GPL"), or
  31 # the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  32 # in which case the provisions of the GPL or the LGPL are applicable instead
  33 # of those above. If you wish to allow use of your version of this file only
  34 # under the terms of either the GPL or the LGPL, and not to allow others to
  35 # use your version of this file under the terms of the MPL, indicate your
  36 # decision by deleting the provisions above and replace them with the notice
  37 # and other provisions required by the GPL or the LGPL. If you do not delete
  38 # the provisions above, a recipient may use your version of this file under
  39 # the terms of any one of the MPL, the GPL or the LGPL.
  40 #
  41 # ***** END LICENSE BLOCK *****
  42
  43 /** Document Zoom Management Code
  44  *
  45  * To use this, you'll need to have a getBrowser() function.
  46  **/
  47
  48 var ZoomManager = {
  49   get _prefBranch ZoomManager_get__prefBranch() {
  50     delete this._prefBranch;
  51     return this._prefBranch = Components.classes["@mozilla.org/preferences-service;1"]
  52                                         .getService(Components.interfaces.nsIPrefBranch);
  53   },
  54
  55   get MIN ZoomManager_get_MIN() {
  56     delete this.MIN;
  57     return this.MIN = this._prefBranch.getIntPref("zoom.minPercent") / 100;
  58   },
  59
  60   get MAX ZoomManager_get_MAX() {
  61     delete this.MAX;
  62     return this.MAX = this._prefBranch.getIntPref("zoom.maxPercent") / 100;
  63   },
  64
  65   get useFullZoom ZoomManager_get_useFullZoom() {
  66     return this._prefBranch.getBoolPref("browser.zoom.full");
  67   },
  68
  69   set useFullZoom ZoomManager_set_useFullZoom(aVal) {
  70     this._prefBranch.setBoolPref("browser.zoom.full", aVal);
  71     return aVal;
  72   },
  73
  74   get zoom ZoomManager_get_zoom() {
  75     var markupDocumentViewer = getBrowser().markupDocumentViewer;
  76
  77     return this.useFullZoom ? markupDocumentViewer.fullZoom
  78                             : markupDocumentViewer.textZoom;
  79   },
  80
  81   set zoom ZoomManager_set_zoom(aVal) {
  82     if (aVal < this.MIN || aVal > this.MAX)
  83       throw Components.results.NS_ERROR_INVALID_ARG;
  84
  85     var markupDocumentViewer = getBrowser().markupDocumentViewer;
  86
  87     if (this.useFullZoom) {
  88       markupDocumentViewer.textZoom = 1;
  89       markupDocumentViewer.fullZoom = aVal;
  90     } else {
  91       markupDocumentViewer.textZoom = aVal;
  92       markupDocumentViewer.fullZoom = 1;
  93     }
  94
  95     return aVal;
  96   },
  97
  98   get zoomValues ZoomManager_get_zoomValues() {
  99     var zoomValues = this._prefBranch.getCharPref("toolkit.zoomManager.zoomValues")
 100                                      .split(",").map(parseFloat);
 101     zoomValues.sort();
 102
 103     while (zoomValues[0] < this.MIN)
 104       zoomValues.shift();
 105
 106     while (zoomValues[zoomValues.length - 1] > this.MAX)
 107       zoomValues.pop();
 108
 109     delete this.zoomValues;
 110     return this.zoomValues = zoomValues;
 111   },
 112
 113   enlarge: function ZoomManager_enlarge() {
 114     var i = this.zoomValues.indexOf(this.snap(this.zoom)) + 1;
 115     if (i < this.zoomValues.length)
 116       this.zoom = this.zoomValues[i];
 117   },
 118
 119   reduce: function ZoomManager_reduce() {
 120     var i = this.zoomValues.indexOf(this.snap(this.zoom)) - 1;
 121     if (i >= 0)
 122       this.zoom = this.zoomValues[i];
 123   },
 124
 125   reset: function ZoomManager_reset() {
 126     this.zoom = 1;
 127   },
 128
 129   toggleZoom: function ZoomManager_toggleZoom() {
 130     var zoomLevel = this.zoom;
 131
 132     this.useFullZoom = !this.useFullZoom;
 133     this.zoom = zoomLevel;
 134   },
 135
 136   snap: function ZoomManager_snap(aVal) {
 137     var values = this.zoomValues;
 138     for (var i = 0; i < values.length; i++) {
 139       if (values[i] >= aVal) {
 140         if (i > 0 && aVal - values[i - 1] < values[i] - aVal)
 141           i--;
 142         return values[i];
 143       }
 144     }
 145     return values[i - 1];
 146   }
 147 }