// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt Apache-2.0
/* -*- 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) 2010-2020 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 = "2.7.9";
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",
"-webkit-box-sizing":"content-box", // Android ≤ 2.3, iOS ≤ 4
"-moz-box-sizing":"content-box", // Firefox ≤ 28
"box-sizing":"content-box", // Chrome, Firefox 29+, IE 8+, Opera, Safari 5.1
"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);
// @license-end
