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- /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
-
- * 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 Peter Annema are Copyright (C) 2000
- * Peter Annema. 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 the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- */
-
- /** 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 = Math.round(getMarkupDocumentViewer().textZoom * 100);
- if (this.indexOf(currentZoom) == -1) {
- if (currentZoom != this.factorOther) {
- this.factorOther = currentZoom;
- this.factorAnchor = this.factorOther;
- }
- }
- 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");
- if (textZoomMenu) {
- var zoom = ZoomManager.prototype.getInstance();
-
- textZoomMenu.removeAttribute("hidden");
-
- 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");
- 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;
- }
-