/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */ /* vim: set ts=2 et sw=2 tw=80: */ /************************************************************* * * MathJax/extensions/MathZoom.js * * Implements the zoom feature for enlarging math expressions. It is * loaded automatically when the Zoom menu selection changes from "None". * * --------------------------------------------------------------------- * * Copyright (c) 2010-2015 The MathJax Consortium * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ (function (HUB,HTML,AJAX,HTMLCSS,nMML) { var VERSION = "2.5.0"; var CONFIG = HUB.CombineConfig("MathZoom",{ styles: { // // The styles for the MathZoom display box // "#MathJax_Zoom": { position:"absolute", "background-color":"#F0F0F0", overflow:"auto", display:"block", "z-index":301, padding:".5em", border:"1px solid black", margin:0, "font-weight":"normal", "font-style":"normal", "text-align":"left", "text-indent":0, "text-transform":"none", "line-height":"normal", "letter-spacing":"normal", "word-spacing":"normal", "word-wrap":"normal", "white-space":"nowrap", "float":"none", "box-shadow":"5px 5px 15px #AAAAAA", // Opera 10.5 and IE9 "-webkit-box-shadow":"5px 5px 15px #AAAAAA", // Safari 3 and Chrome "-moz-box-shadow":"5px 5px 15px #AAAAAA", // Forefox 3.5 "-khtml-box-shadow":"5px 5px 15px #AAAAAA", // Konqueror filter: "progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')" // IE }, // // The styles for the hidden overlay (should not need to be adjusted by the page author) // "#MathJax_ZoomOverlay": { position:"absolute", left:0, top:0, "z-index":300, display:"inline-block", width:"100%", height:"100%", border:0, padding:0, margin:0, "background-color":"white", opacity:0, filter:"alpha(opacity=0)" }, "#MathJax_ZoomFrame": { position:"relative", display:"inline-block", height:0, width:0 }, "#MathJax_ZoomEventTrap": { position:"absolute", left:0, top:0, "z-index":302, display:"inline-block", border:0, padding:0, margin:0, "background-color":"white", opacity:0, filter:"alpha(opacity=0)" } } }); var FALSE, HOVER, EVENT; MathJax.Hub.Register.StartupHook("MathEvents Ready",function () { EVENT = MathJax.Extension.MathEvents.Event; FALSE = MathJax.Extension.MathEvents.Event.False; HOVER = MathJax.Extension.MathEvents.Hover; }); /*************************************************************/ var ZOOM = MathJax.Extension.MathZoom = { version: VERSION, settings: HUB.config.menuSettings, scrollSize: 18, // width of scrool bars // // Process events passed from output jax // HandleEvent: function (event,type,math) { if (ZOOM.settings.CTRL && !event.ctrlKey) return true; if (ZOOM.settings.ALT && !event.altKey) return true; if (ZOOM.settings.CMD && !event.metaKey) return true; if (ZOOM.settings.Shift && !event.shiftKey) return true; if (!ZOOM[type]) return true; return ZOOM[type](event,math); }, // // Zoom on click // Click: function (event,math) { if (this.settings.zoom === "Click") {return this.Zoom(event,math)} }, // // Zoom on double click // DblClick: function (event,math) { if (this.settings.zoom === "Double-Click" || this.settings.zoom === "DoubleClick") {return this.Zoom(event,math)} }, // // Zoom on hover (called by MathEvents.Hover) // Hover: function (event,math) { if (this.settings.zoom === "Hover") {this.Zoom(event,math); return true} return false; }, // // Handle the actual zooming // Zoom: function (event,math) { // // Remove any other zoom and clear timers // this.Remove(); HOVER.ClearHoverTimer(); EVENT.ClearSelection(); // // Find the jax // var JAX = MathJax.OutputJax[math.jaxID]; var jax = JAX.getJaxFromMath(math); if (jax.hover) {HOVER.UnHover(jax)} // // Create the DOM elements for the zoom box // var container = this.findContainer(math); var Mw = Math.floor(.85*container.clientWidth), Mh = Math.max(document.body.clientHeight,document.documentElement.clientHeight); if (this.getOverflow(container) !== "visible") {Mh = Math.min(container.clientHeight,Mh)} Mh = Math.floor(.85*Mh); var div = HTML.Element( "span",{id:"MathJax_ZoomFrame"},[ ["span",{id:"MathJax_ZoomOverlay", onmousedown:this.Remove}], ["span",{ id:"MathJax_Zoom", onclick:this.Remove, style:{visibility:"hidden", fontSize:this.settings.zscale} },[["span",{style:{display:"inline-block", "white-space":"nowrap"}}]] ]] ); var zoom = div.lastChild, span = zoom.firstChild, overlay = div.firstChild; math.parentNode.insertBefore(div,math); math.parentNode.insertBefore(math,div); // put div after math if (span.addEventListener) {span.addEventListener("mousedown",this.Remove,true)} var eW = zoom.offsetWidth || zoom.clientWidth; Mw -= eW; Mh -= eW; zoom.style.maxWidth = Mw+"px"; zoom.style.maxHeight = Mh+"px"; if (this.msieTrapEventBug) { var trap = HTML.Element("span",{id:"MathJax_ZoomEventTrap", onmousedown:this.Remove}); div.insertBefore(trap,zoom); } // // Display the zoomed math // if (this.msieZIndexBug) { // MSIE doesn't do z-index properly, so move the div to the document.body, // and use an image as a tracker for the usual position var tracker = HTML.addElement(document.body,"img",{ src:"about:blank", id:"MathJax_ZoomTracker", width:0, height:0, style:{width:0, height:0, position:"relative"} }); div.style.position = "relative"; div.style.zIndex = CONFIG.styles["#MathJax_ZoomOverlay"]["z-index"]; div = tracker; } var bbox = JAX.Zoom(jax,span,math,Mw,Mh); // // Fix up size and position for browsers with bugs (IE) // if (this.msiePositionBug) { if (this.msieSizeBug) {zoom.style.height = bbox.zH+"px"; zoom.style.width = bbox.zW+"px"} // IE8 gets the dimensions completely wrong if (zoom.offsetHeight > Mh) {zoom.style.height = Mh+"px"; zoom.style.width = (bbox.zW+this.scrollSize)+"px"} // IE doesn't do max-height? if (zoom.offsetWidth > Mw) {zoom.style.width = Mw+"px"; zoom.style.height = (bbox.zH+this.scrollSize)+"px"} } if (this.operaPositionBug) {zoom.style.width = Math.min(Mw,bbox.zW)+"px"} // Opera gets width as 0? if (zoom.offsetWidth > eW && zoom.offsetWidth-eW < Mw && zoom.offsetHeight-eW < Mh) {zoom.style.overflow = "visible"} // don't show scroll bars if we don't need to this.Position(zoom,bbox); if (this.msieTrapEventBug) { trap.style.height = zoom.clientHeight+"px"; trap.style.width = zoom.clientWidth+"px"; trap.style.left = (parseFloat(zoom.style.left)+zoom.clientLeft)+"px"; trap.style.top = (parseFloat(zoom.style.top)+zoom.clientTop)+"px"; } zoom.style.visibility = ""; // // Add event handlers // if (this.settings.zoom === "Hover") {overlay.onmouseover = this.Remove} if (window.addEventListener) {addEventListener("resize",this.Resize,false)} else if (window.attachEvent) {attachEvent("onresize",this.Resize)} else {this.onresize = window.onresize; window.onresize = this.Resize} // // Let others know about the zoomed math // HUB.signal.Post(["math zoomed",jax]); // // Canel further actions // return FALSE(event); }, // // Set the position of the zoom box and overlay // Position: function (zoom,bbox) { zoom.style.display = "none"; // avoids getting excessive width in Resize() var XY = this.Resize(), x = XY.x, y = XY.y, W = bbox.mW; zoom.style.display = ""; var dx = -W-Math.floor((zoom.offsetWidth-W)/2), dy = bbox.Y; zoom.style.left = Math.max(dx,10-x)+"px"; zoom.style.top = Math.max(dy,10-y)+"px"; if (!ZOOM.msiePositionBug) {ZOOM.SetWH()} // refigure overlay width/height }, // // Handle resizing of overlay while zoom is displayed // Resize: function (event) { if (ZOOM.onresize) {ZOOM.onresize(event)} var div = document.getElementById("MathJax_ZoomFrame"), overlay = document.getElementById("MathJax_ZoomOverlay"); var xy = ZOOM.getXY(div), obj = ZOOM.findContainer(div); if (ZOOM.getOverflow(obj) !== "visible") { overlay.scroll_parent = obj; // Save this for future reference. var XY = ZOOM.getXY(obj); // Remove container position xy.x -= XY.x; xy.y -= XY.y; XY = ZOOM.getBorder(obj); // Remove container border xy.x -= XY.x; xy.y -= XY.y; } overlay.style.left = (-xy.x)+"px"; overlay.style.top = (-xy.y)+"px"; if (ZOOM.msiePositionBug) {setTimeout(ZOOM.SetWH,0)} else {ZOOM.SetWH()} return xy; }, SetWH: function () { var overlay = document.getElementById("MathJax_ZoomOverlay"); if (!overlay) return; overlay.style.display = "none"; // so scrollWidth/Height will be right below var doc = overlay.scroll_parent || document.documentElement || document.body; overlay.style.width = doc.scrollWidth + "px"; overlay.style.height = Math.max(doc.clientHeight,doc.scrollHeight) + "px"; overlay.style.display = ""; }, findContainer: function (obj) { obj = obj.parentNode; while (obj.parentNode && obj !== document.body && ZOOM.getOverflow(obj) === "visible") {obj = obj.parentNode} return obj; }, // // Look up CSS properties (use getComputeStyle if available, or currentStyle if not) // getOverflow: (window.getComputedStyle ? function (obj) {return getComputedStyle(obj).overflow} : function (obj) {return (obj.currentStyle||{overflow:"visible"}).overflow}), getBorder: function (obj) { var size = {thin: 1, medium: 2, thick: 3}; var style = (window.getComputedStyle ? getComputedStyle(obj) : (obj.currentStyle || {borderLeftWidth:0,borderTopWidth:0})); var x = style.borderLeftWidth, y = style.borderTopWidth; if (size[x]) {x = size[x]} else {x = parseInt(x)} if (size[y]) {y = size[y]} else {y = parseInt(y)} return {x:x, y:y}; }, // // Get the position of an element on the page // getXY: function (div) { var x = 0, y = 0, obj; obj = div; while (obj.offsetParent) {x += obj.offsetLeft; obj = obj.offsetParent} if (ZOOM.operaPositionBug) {div.style.border = "1px solid"} // to get vertical position right obj = div; while (obj.offsetParent) {y += obj.offsetTop; obj = obj.offsetParent} if (ZOOM.operaPositionBug) {div.style.border = ""} return {x:x, y:y}; }, // // Remove zoom display and event handlers // Remove: function (event) { var div = document.getElementById("MathJax_ZoomFrame"); if (div) { var JAX = MathJax.OutputJax[div.previousSibling.jaxID]; var jax = JAX.getJaxFromMath(div.previousSibling); HUB.signal.Post(["math unzoomed",jax]); div.parentNode.removeChild(div); div = document.getElementById("MathJax_ZoomTracker"); if (div) {div.parentNode.removeChild(div)} if (ZOOM.operaRefreshBug) { // force a redisplay of the page // (Opera doesn't refresh properly after the zoom is removed) var overlay = HTML.addElement(document.body,"div",{ style:{position:"fixed", left:0, top:0, width:"100%", height:"100%", backgroundColor:"white", opacity:0}, id: "MathJax_OperaDiv" }); document.body.removeChild(overlay); } if (window.removeEventListener) {removeEventListener("resize",ZOOM.Resize,false)} else if (window.detachEvent) {detachEvent("onresize",ZOOM.Resize)} else {window.onresize = ZOOM.onresize; delete ZOOM.onresize} } return FALSE(event); } }; /*************************************************************/ HUB.Browser.Select({ MSIE: function (browser) { var mode = (document.documentMode || 0); var isIE9 = (mode >= 9); ZOOM.msiePositionBug = !isIE9; ZOOM.msieSizeBug = browser.versionAtLeast("7.0") && (!document.documentMode || mode === 7 || mode === 8); ZOOM.msieZIndexBug = (mode <= 7); ZOOM.msieInlineBlockAlignBug = (mode <= 7); ZOOM.msieTrapEventBug = !window.addEventListener; if (document.compatMode === "BackCompat") {ZOOM.scrollSize = 52} // don't know why this is so far off if (isIE9) {delete CONFIG.styles["#MathJax_Zoom"].filter} }, Opera: function (browser) { ZOOM.operaPositionBug = true; ZOOM.operaRefreshBug = true; } }); ZOOM.topImg = (ZOOM.msieInlineBlockAlignBug ? HTML.Element("img",{style:{width:0,height:0,position:"relative"},src:"about:blank"}) : HTML.Element("span",{style:{width:0,height:0,display:"inline-block"}}) ); if (ZOOM.operaPositionBug || ZOOM.msieTopBug) {ZOOM.topImg.style.border="1px solid"} /*************************************************************/ MathJax.Callback.Queue( ["StartupHook",MathJax.Hub.Register,"Begin Styles",{}], ["Styles",AJAX,CONFIG.styles], ["Post",HUB.Startup.signal,"MathZoom Ready"], ["loadComplete",AJAX,"[MathJax]/extensions/MathZoom.js"] ); })(MathJax.Hub,MathJax.HTML,MathJax.Ajax,MathJax.OutputJax["HTML-CSS"],MathJax.OutputJax.NativeMML);