mirror of
https://github.com/kovidgoyal/calibre.git
synced 2025-11-04 03:27:00 -05:00
317 lines
12 KiB
JavaScript
317 lines
12 KiB
JavaScript
/*************************************************************
|
|
*
|
|
* 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) 2010-2012 Design Science, Inc.
|
|
*
|
|
* 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 = "2.0";
|
|
|
|
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_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") {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 Mw = Math.floor(.85*document.body.clientWidth),
|
|
Mh = Math.floor(.85*Math.max(document.body.clientHeight,document.documentElement.clientHeight));
|
|
var div = HTML.Element(
|
|
"span",{
|
|
style: {position:"relative", display:"inline-block", height:0, width:0},
|
|
id:"MathJax_ZoomFrame"
|
|
},[
|
|
["span",{id:"MathJax_ZoomOverlay", onmousedown:this.Remove}],
|
|
["span",{
|
|
id:"MathJax_Zoom", onclick:this.Remove,
|
|
style:{
|
|
visibility:"hidden", fontSize:this.settings.zscale,
|
|
"max-width":Mw+"px", "max-height":Mh+"px"
|
|
}
|
|
},[["span",{style:{display:"inline-block", "white-space":"nowrap"}}]]
|
|
]]
|
|
);
|
|
var zoom = div.lastChild, span = zoom.firstChild, overlay = div.firstChild;
|
|
math.parentNode.insertBefore(div,math);
|
|
if (span.addEventListener) {span.addEventListener("mousedown",this.Remove,true)}
|
|
|
|
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 < Mw && zoom.offsetHeight < Mh) {zoom.style.overflow = "visible"}
|
|
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) {
|
|
var XY = this.Resize(), x = XY.x, y = XY.y, W = bbox.mW;
|
|
var dx = -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 x = 0, y = 0, obj,
|
|
div = document.getElementById("MathJax_ZoomFrame"),
|
|
overlay = document.getElementById("MathJax_ZoomOverlay");
|
|
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 = ""}
|
|
overlay.style.left = (-x)+"px"; overlay.style.top = (-y)+"px";
|
|
if (ZOOM.msiePositionBug) {setTimeout(ZOOM.SetWH,0)} else {ZOOM.SetWH()}
|
|
return {x:x, y:y};
|
|
},
|
|
SetWH: function () {
|
|
var overlay = document.getElementById("MathJax_ZoomOverlay");
|
|
overlay.style.width = overlay.style.height = "1px"; // so scrollWidth/Height will be right below
|
|
var doc = document.documentElement || document.body;
|
|
overlay.style.width = doc.scrollWidth + "px";
|
|
overlay.style.height = Math.max(doc.clientHeight,doc.scrollHeight) + "px";
|
|
},
|
|
|
|
//
|
|
// Remove zoom display and event handlers
|
|
//
|
|
Remove: function (event) {
|
|
var div = document.getElementById("MathJax_ZoomFrame");
|
|
if (div) {
|
|
var JAX = MathJax.OutputJax[div.nextSibling.jaxID];
|
|
var jax = JAX.getJaxFromMath(div.nextSibling);
|
|
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);
|