pjs/xpfe/communicator/resources/content/viewZoomOverlay.js

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JavaScript

/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is this file as it was released upon January 6, 2001.
*
* The Initial Developer of the Original Code is
* Peter Annema.
* Portions created by the Initial Developer are Copyright (C) 2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Peter Annema <disttsc@bart.nl> (Original Author)
* Jonas Sicking <sicking@bigfoot.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/** Document Zoom Management Code
*
* To use this, you'll need to have a <menu id="menu_textZoom"/>
* and a getMarkupDocumentViewer() function which returns a
* nsIMarkupDocumentViewer.
*
**/
function ZoomManager() {
this.bundle = document.getElementById("bundle_viewZoom");
// factorAnchor starts on factorOther
this.factorOther = parseInt(this.bundle.getString("valueOther"));
this.factorAnchor = this.factorOther;
}
ZoomManager.prototype = {
instance : null,
getInstance : function() {
if (!ZoomManager.prototype.instance)
ZoomManager.prototype.instance = new ZoomManager();
return ZoomManager.prototype.instance;
},
MIN : 1,
MAX : 2000,
bundle : null,
zoomFactorsString : "", // cache
zoomFactors : null,
factorOther : 300,
factorAnchor : 300,
steps : 0,
get textZoom() {
var currentZoom;
try {
currentZoom = Math.round(getMarkupDocumentViewer().textZoom * 100);
if (this.indexOf(currentZoom) == -1) {
if (currentZoom != this.factorOther) {
this.factorOther = currentZoom;
this.factorAnchor = this.factorOther;
}
}
} catch (e) {
currentZoom = 100;
}
return currentZoom;
},
set textZoom(aZoom) {
if (aZoom < this.MIN || aZoom > this.MAX)
throw Components.results.NS_ERROR_INVALID_ARG;
getMarkupDocumentViewer().textZoom = aZoom / 100;
},
enlarge : function() {
this.jump(1);
},
reduce : function() {
this.jump(-1);
},
reset : function() {
this.textZoom = 100;
},
getZoomFactors : function() {
this.ensureZoomFactors();
return this.zoomFactors;
},
indexOf : function(aZoom) {
this.ensureZoomFactors();
var index = -1;
if (this.isZoomInRange(aZoom)) {
index = this.zoomFactors.length - 1;
while (index >= 0 && this.zoomFactors[index] != aZoom)
--index;
}
return index;
},
/***** internal helper functions below here *****/
ensureZoomFactors : function() {
var zoomFactorsString = this.bundle.getString("values");
if (this.zoomFactorsString != zoomFactorsString) {
this.zoomFactorsString = zoomFactorsString;
this.zoomFactors = zoomFactorsString.split(",");
for (var i = 0; i<this.zoomFactors.length; ++i)
this.zoomFactors[i] = parseInt(this.zoomFactors[i]);
}
},
isLevelInRange : function(aLevel) {
return (aLevel >= 0 && aLevel < this.zoomFactors.length);
},
isZoomInRange : function(aZoom) {
return (aZoom >= this.zoomFactors[0] && aZoom <= this.zoomFactors[this.zoomFactors.length - 1]);
},
jump : function(aDirection) {
if (aDirection != -1 && aDirection != 1)
throw Components.results.NS_ERROR_INVALID_ARG;
this.ensureZoomFactors();
var currentZoom = this.textZoom;
var insertIndex = -1;
var stepFactor = parseFloat(this.bundle.getString("stepFactor"));
// temporarily add factorOther to list
if (this.isZoomInRange(this.factorOther)) {
insertIndex = 0;
while (this.zoomFactors[insertIndex] < this.factorOther)
++insertIndex;
if (this.zoomFactors[insertIndex] != this.factorOther)
this.zoomFactors.splice(insertIndex, 0, this.factorOther);
}
var factor;
var done = false;
if (this.isZoomInRange(currentZoom)) {
var index = this.indexOf(currentZoom);
if (aDirection == -1 && index == 0 ||
aDirection == 1 && index == this.zoomFactors.length - 1) {
this.steps = 0;
this.factorAnchor = this.zoomFactors[index];
} else {
factor = this.zoomFactors[index + aDirection];
done = true;
}
}
if (!done) {
this.steps += aDirection;
factor = this.factorAnchor * Math.pow(stepFactor, this.steps);
if (factor < this.MIN || factor > this.MAX) {
this.steps -= aDirection;
factor = this.factorAnchor * Math.pow(stepFactor, this.steps);
}
factor = Math.round(factor);
if (this.isZoomInRange(factor))
factor = this.snap(factor);
else
this.factorOther = factor;
}
if (insertIndex != -1)
this.zoomFactors.splice(insertIndex, 1);
this.textZoom = factor;
},
snap : function(aZoom) {
if (this.isZoomInRange(aZoom)) {
var level = 0;
while (this.zoomFactors[level + 1] < aZoom)
++level;
// if aZoom closer to [level + 1] than [level], snap to [level + 1]
if ((this.zoomFactors[level + 1] - aZoom) < (aZoom - this.zoomFactors[level]))
++level;
aZoom = this.zoomFactors[level];
}
return aZoom;
}
}
/***** init and helper functions for viewZoomOverlay.xul *****/
window.addEventListener("load", registerZoomManager, false);
function registerZoomManager()
{
var textZoomMenu = document.getElementById("menu_textZoom");
var zoom = ZoomManager.prototype.getInstance();
var parentMenu = textZoomMenu.parentNode;
parentMenu.addEventListener("popupshowing", updateViewMenu, false);
var insertBefore = document.getElementById("menu_textZoomInsertBefore");
var popup = insertBefore.parentNode;
var accessKeys = zoom.bundle.getString("accessKeys").split(",");
var zoomFactors = zoom.getZoomFactors();
for (var i = 0; i < zoomFactors.length; ++i) {
var menuItem = document.createElement("menuitem");
menuItem.setAttribute("type", "radio");
menuItem.setAttribute("name", "textZoom");
var label;
if (zoomFactors[i] == 100) {
label = zoom.bundle.getString("labelOriginal");
menuItem.setAttribute("key", "key_textZoomReset");
}
else
label = zoom.bundle.getString("label");
menuItem.setAttribute("label", label.replace(/%zoom%/, zoomFactors[i]));
menuItem.setAttribute("accesskey", accessKeys[i]);
menuItem.setAttribute("oncommand", "ZoomManager.prototype.getInstance().textZoom = this.value;");
menuItem.setAttribute("value", zoomFactors[i]);
popup.insertBefore(menuItem, insertBefore);
}
}
function updateViewMenu()
{
var zoom = ZoomManager.prototype.getInstance();
var textZoomMenu = document.getElementById("menu_textZoom");
var menuLabel = zoom.bundle.getString("menuLabel").replace(/%zoom%/, zoom.textZoom);
textZoomMenu.setAttribute("label", menuLabel);
}
function updateTextZoomMenu()
{
var zoom = ZoomManager.prototype.getInstance();
var currentZoom = zoom.textZoom;
var textZoomOther = document.getElementById("menu_textZoomOther");
var label = zoom.bundle.getString("labelOther");
textZoomOther.setAttribute("label", label.replace(/%zoom%/, zoom.factorOther));
textZoomOther.setAttribute("value", zoom.factorOther);
var popup = document.getElementById("menu_textZoomPopup");
var item = popup.firstChild;
while (item) {
if (item.getAttribute("name") == "textZoom") {
if (item.getAttribute("value") == currentZoom)
item.setAttribute("checked","true");
else
item.removeAttribute("checked");
}
item = item.nextSibling;
}
}
function setTextZoomOther()
{
var zoom = ZoomManager.prototype.getInstance();
// open dialog and ask for new value
var o = {value: zoom.factorOther, zoomMin: zoom.MIN, zoomMax: zoom.MAX};
window.openDialog("chrome://communicator/content/askViewZoom.xul", "AskViewZoom", "chrome,modal,titlebar", o);
if (o.zoomOK)
zoom.textZoom = o.value;
}