315 lines
12 KiB
JavaScript
315 lines
12 KiB
JavaScript
/*************************************************************
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*
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* MathJax/extensions/MathZoom.js
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*
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* Implements the zoom feature for enlarging math expressions. It is
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* loaded automatically when the Zoom menu selection changes from "None".
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2010-2011 Design Science, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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(function (HUB,HTML,AJAX,HTMLCSS,nMML) {
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var VERSION = "1.1.3";
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var CONFIG = HUB.CombineConfig("MathZoom",{
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styles: {
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//
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// The styles for the MathZoom display box
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//
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"#MathJax_Zoom": {
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position:"absolute", "background-color":"#F0F0F0", overflow:"auto",
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display:"block", "z-index":301, padding:".5em", border:"1px solid black", margin:0,
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"font-family":"serif", "font-size":"85%", "font-weight":"normal",
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"font-style":"normal", "text-align":"left", "text-indent":0, "text-transform":"none",
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"line-height":"normal", "letter-spacing":"normal", "word-spacing":"normal",
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"word-wrap":"normal", "white-space":"nowrap", "float":"none",
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"box-shadow":"5px 5px 15px #AAAAAA", // Opera 10.5 and IE9
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"-webkit-box-shadow":"5px 5px 15px #AAAAAA", // Safari 3 and Chrome
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"-moz-box-shadow":"5px 5px 15px #AAAAAA", // Forefox 3.5
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"-khtml-box-shadow":"5px 5px 15px #AAAAAA", // Konqueror
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filter: "progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')" // IE
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},
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//
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// The styles for the hidden overlay (should not need to be adjusted by the page author)
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//
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"#MathJax_ZoomOverlay": {
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position:"absolute", left:0, top:0, "z-index":300, display:"inline-block",
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width:"100%", height:"100%", border:0, padding:0, margin:0,
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"background-color":"white", opacity:0, filter:"alpha(opacity=0)"
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}
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}
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});
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var FALSE, HOVER, EVENT;
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MathJax.Hub.Register.StartupHook("MathEvents Ready",function () {
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EVENT = MathJax.Extension.MathEvents.Event;
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FALSE = MathJax.Extension.MathEvents.Event.False;
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HOVER = MathJax.Extension.MathEvents.Hover;
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});
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/*************************************************************/
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var ZOOM = MathJax.Extension.MathZoom = {
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version: VERSION,
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settings: HUB.config.menuSettings,
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//
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// Process events passed from output jax
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//
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HandleEvent: function (event,type,math) {
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if (ZOOM.settings.CTRL && !event.ctrlKey) return true;
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if (ZOOM.settings.ALT && !event.altKey) return true;
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if (ZOOM.settings.CMD && !event.metaKey) return true;
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if (ZOOM.settings.Shift && !event.shiftKey) return true;
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if (!ZOOM[type]) return true;
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return ZOOM[type](event,math);
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},
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//
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// Zoom on click
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//
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Click: function (event,math) {
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if (this.settings.zoom === "Click") {return this.Zoom(event,math)}
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},
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//
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// Zoom on double click
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//
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DblClick: function (event,math) {
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if (this.settings.zoom === "Double-Click") {return this.Zoom(event,math)}
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},
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//
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// Zoom on hover (called by UI.Hover)
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//
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Hover: function (event,math) {
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if (this.settings.zoom === "Hover") {this.Zoom(event,math); return true}
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return false;
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},
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//
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// Handle the actual zooming
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//
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Zoom: function (event,math) {
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this.Remove(); HOVER.ClearHoverTimer();
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EVENT.ClearSelection();
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//
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// Find the jax and its type
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//
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/*
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* var parent = math.parentNode;
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* if (parent.className === "MathJax_MathContainer") {parent = parent.parentNode}
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* if (parent.parentNode.className === "MathJax_MathContainer") {parent = parent.parentNode.parentNode}
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*/
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var JAX = MathJax.OutputJax[math.jaxID];
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var jax = JAX.getJaxFromMath(math), root = jax.root;
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if (jax.hover) {HOVER.UnHover(jax)}
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//
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// Create the DOM elements for the zoom box
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//
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var Mw = Math.floor(.85*document.body.clientWidth),
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Mh = Math.floor(.85*document.body.clientHeight);
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var div = HTML.Element(
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"span",{
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style: {position:"relative", display:"inline-block", height:0, width:0},
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id:"MathJax_ZoomFrame"
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},[
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["span",{id:"MathJax_ZoomOverlay", onmousedown:this.Remove}],
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["span",{
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id:"MathJax_Zoom", onclick: this.Remove,
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style:{
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visibility:"hidden", fontSize:this.settings.zscale,
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"max-width":Mw+"px", "max-height":Mh+"px"
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}
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},[["span",{style:{display:"inline-block", "white-space":"nowrap"}}]]]
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]
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);
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var zoom = div.lastChild, span = zoom.firstChild, overlay = div.firstChild;
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math.parentNode.insertBefore(div,math);
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//
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// Display the zoomed math
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//
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if (this.msieZIndexBug) {
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// MSIE doesn't do z-index properly, so move the div to the document.body,
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// and use an empty span as a tracker for the usual position
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var tracker = HTML.addElement(document.body,"img",{
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src:"about:blank", id:"MathJax_ZoomTracker", width: 0, height: 0,
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style:{width:0, height:0, position:"relative"}
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});
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div.style.position = "relative";
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div.style.zIndex = CONFIG.styles["#MathJax_ZoomOverlay"]["z-index"];
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div = tracker;
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}
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var bbox = JAX.Zoom(root,span,math,Mw,Mh);
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//
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// Fix up size and position for browsers with bugs (IE)
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//
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if (this.msiePositionBug) {
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if (this.msieSizeBug)
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{zoom.style.height = bbox.zH+"px"; zoom.style.width = bbox.zW+"px"} // IE8 gets the dimensions completely wrong
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if (zoom.offsetHeight > Mh) {zoom.style.height = Mh+"px"} // IE doesn't do max-height?
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if (zoom.offsetWidth > Mw) {zoom.style.width = Mw+"px"}
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if (math.nextSibling) {math.parentNode.insertBefore(div,math.nextSibling)}
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else {parent.appendChild(div)} // needs to be after to be above?
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}
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if (this.operaPositionBug) {zoom.style.width = Math.min(Mw,bbox.zW)+"px"} // Opera gets width as 0?
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if (zoom.offsetWidth <= Mw && zoom.offsetHeight <= Mh) {zoom.style.overflow = "visible"}
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this.Position(zoom,bbox,(JAX.id === "MathML" && parent.nodeName.toLowerCase() === "div"));
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zoom.style.visibility = "";
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//
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// Add event handlers
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//
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if (this.settings.zoom === "Hover") {overlay.onmouseover = this.Remove}
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if (window.addEventListener) {addEventListener("resize",this.Resize,false)}
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else if (window.attachEvent) {attachEvent("onresize",this.Resize)}
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else {this.onresize = window.onresize; window.onresize = this.Resize}
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//
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// Canel further actions
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//
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return FALSE(event);
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},
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//
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// Get top offset from baseline
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//
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getTop: function (root,span,math,topBug,borderBug) {
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span.appendChild(this.topImg);
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var top = this.topImg.offsetTop;
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if (topBug) {
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// For IE, frame is not at the baseline, so remove extra height
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var wrap = math.parentNode.style.whiteSpace;
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math.parentNode.style.whiteSpace = "nowrap";
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math.parentNode.insertBefore(this.topImg,math);
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top -= this.topImg.offsetTop - span.parentNode.parentNode.offsetTop;
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math.parentNode.style.whiteSpace = wrap;
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}
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if (borderBug) {top += Math.floor(.5*HTMLCSS.em)} // adjust for zoom box padding
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this.topImg.parentNode.removeChild(this.topImg);
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return top;
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},
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//
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// Set the position of the zoom box and overlay
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//
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Position: function (zoom,bbox,MMLdisplay) {
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var XY = this.Resize(), x = XY.x, y = XY.y, W = bbox.mW;
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if (this.msieIE8Bug) {W = -W}
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var dx = -Math.floor((zoom.offsetWidth-W)/2), dy = bbox.Y;
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zoom.style.left = Math.max(dx,10-x)+"px"; zoom.style.top = Math.max(dy,10-y)+"px";
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},
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//
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// Handle resizing of overlay while zoom is displayed
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//
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Resize: function (event) {
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if (ZOOM.onresize) {ZOOM.onresize(event)}
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var x = 0, y = 0,
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div = document.getElementById("MathJax_ZoomFrame"), obj = div,
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overlay = document.getElementById("MathJax_ZoomOverlay");
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if (ZOOM.operaPositionBug) {div.style.border = "1px solid"} // to get vertical position right
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if (obj.offsetParent) {
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do {x += obj.offsetLeft; y += obj.offsetTop} while (obj = obj.offsetParent);
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}
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if (ZOOM.operaPositionBug) {div.style.border = ""}
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overlay.style.left = (-x)+"px"; overlay.style.top = (-y)+"px";
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if (ZOOM.msiePositionBug) {setTimeout(ZOOM.SetWH,0)} else {ZOOM.SetWH()}
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return {x:x, y:y};
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},
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SetWH: function () {
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var overlay = document.getElementById("MathJax_ZoomOverlay");
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overlay.style.width = overlay.style.height = "1px"; // so scrollWidth/Height will be right below
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overlay.style.width = document.body.scrollWidth + "px";
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overlay.style.height = document.body.scrollHeight + "px";
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},
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//
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// Remove zoom display and event handlers
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//
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Remove: function (event) {
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var div = document.getElementById("MathJax_ZoomFrame");
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if (div) {
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div.parentNode.removeChild(div);
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div = document.getElementById("MathJax_ZoomTracker");
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if (div) {div.parentNode.removeChild(div)}
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if (ZOOM.operaRefreshBug) {
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// force a redisplay of the page
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// (Opera doesn't refresh properly after the zoom is removed)
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var overlay = HTML.addElement(document.body,"div",{
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style:{position:"fixed", left:0, top:0, width:"100%", height:"100%",
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backgroundColor:"white", opacity:0},
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id: "MathJax_OperaDiv"
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});
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document.body.removeChild(overlay);
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}
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if (window.removeEventListener) {removeEventListener("resize",ZOOM.Resize,false)}
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else if (window.detachEvent) {detachEvent("onresize",ZOOM.Resize)}
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else {window.onresize = ZOOM.onresize; delete ZOOM.onresize}
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}
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return FALSE(event);
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}
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};
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/*************************************************************/
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HUB.Browser.Select({
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MSIE: function (browser) {
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var quirks = (document.compatMode === "BackCompat");
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var isIE8 = browser.versionAtLeast("8.0") && document.documentMode > 7;
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var isIE9 = document.documentMode >= 9;
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ZOOM.msiePositionBug = !isIE9;
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ZOOM.msieSizeBug = browser.versionAtLeast("7.0") &&
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(!document.documentMode || document.documentMode === 7 || document.documentMode === 8);
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ZOOM.msieIE8Bug = isIE8 && (document.documentMode === 8);
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ZOOM.msieZIndexBug = !isIE8;
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ZOOM.msieInlineBlockAlignBug = (!isIE8 || quirks);
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if (document.documentMode >= 9) {delete CONFIG.styles["#MathJax_Zoom"].filter}
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},
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Opera: function (browser) {
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ZOOM.operaPositionBug = true;
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ZOOM.operaRefreshBug = true;
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}
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});
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ZOOM.topImg = (ZOOM.msieInlineBlockAlignBug ?
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HTML.Element("img",{style:{width:0,height:0,position:"relative"},src:"about:blank"}) :
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HTML.Element("span",{style:{width:0,height:0,display:"inline-block"}})
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);
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if (ZOOM.operaPositionBug || ZOOM.msieTopBug) {ZOOM.topImg.style.border="1px solid"}
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/*************************************************************/
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MathJax.Callback.Queue(
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["StartupHook",MathJax.Hub.Register,"Begin Styles",{}],
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["Styles",AJAX,CONFIG.styles],
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["Post",HUB.Startup.signal,"MathZoom Ready"],
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["loadComplete",AJAX,"[MathJax]/extensions/MathZoom.js"]
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);
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})(MathJax.Hub,MathJax.HTML,MathJax.Ajax,MathJax.OutputJax["HTML-CSS"],MathJax.OutputJax.NativeMML);
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