mirror of
https://github.com/kovidgoyal/calibre.git
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310 lines
12 KiB
JavaScript
310 lines
12 KiB
JavaScript
/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/*************************************************************
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*
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* MathJax/extensions/MatchWebFonts.js
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*
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* Adds code to the output jax so that if web fonts are used on the page,
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* MathJax will be able to detect their arrival and update the math to
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* accommodate the change in font. For the NativeMML output, this works
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* both for web fonts in main text, and for web fonts in the math as well.
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2013-2015 The MathJax Consortium
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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,AJAX) {
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var VERSION = "2.6.0";
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var CONFIG = MathJax.Hub.CombineConfig("MatchWebFonts",{
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matchFor: {
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"HTML-CSS": true,
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NativeMML: true,
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SVG: true
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},
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fontCheckDelay: 500, // initial delay for the first check for web fonts
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fontCheckTimeout: 15 * 1000, // how long to keep looking for fonts (15 seconds)
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});
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MathJax.Extension.MatchWebFonts = {
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version: VERSION,
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config: CONFIG
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};
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HUB.Register.StartupHook("HTML-CSS Jax Ready",function () {
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var HTMLCSS = MathJax.OutputJax["HTML-CSS"];
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var POSTTRANSLATE = HTMLCSS.postTranslate;
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HTMLCSS.Augment({
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postTranslate: function (state,partial) {
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if (!partial && CONFIG.matchFor["HTML-CSS"] && this.config.matchFontHeight) {
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//
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// Check for changes in the web fonts that might affect the font
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// size for math elements. This is a periodic check that goes on
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// until a timeout is reached.
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//
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AJAX.timer.start(AJAX,["checkFonts",this,state.jax[this.id]],
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CONFIG.fontCheckDelay,CONFIG.fontCheckTimeout);
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}
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return POSTTRANSLATE.apply(this,arguments); // do the original function
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},
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checkFonts: function (check,scripts) {
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if (check.time(function () {})) return;
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var size = [], i, m, retry = false;
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//
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// Add the elements used for testing ex and em sizes
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//
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i];
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if (script.parentNode && script.MathJax.elementJax) {
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script.parentNode.insertBefore(this.EmExSpan.cloneNode(true),script);
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}
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}
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//
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// Check to see if anything has changed
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//
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i]; if (!script.parentNode) continue; retry = true;
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var jax = script.MathJax.elementJax; if (!jax) continue;
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//
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// Check if ex or mex has changed
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//
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var test = script.previousSibling;
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var ex = test.firstChild.offsetHeight/60;
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var em = test.lastChild.lastChild.offsetHeight/60;
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if (ex === 0 || ex === "NaN") {ex = this.defaultEx; em = this.defaultEm}
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if (ex !== jax.HTMLCSS.ex || em !== jax.HTMLCSS.em) {
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var scale = ex/this.TeX.x_height/em;
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scale = Math.floor(Math.max(this.config.minScaleAdjust/100,scale)*this.config.scale);
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if (scale/100 !== jax.scale) {size.push(script); scripts[i] = {}}
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}
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}
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//
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// Remove markers
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//
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scripts = scripts.concat(size); // some scripts have been moved to the size array
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i];
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if (script && script.parentNode && script.MathJax.elementJax) {
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script.parentNode.removeChild(script.previousSibling);
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}
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}
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//
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// Rerender the changed items
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//
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if (size.length) {HUB.Queue(["Rerender",HUB,[size],{}])}
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//
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// Try again later
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//
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if (retry) {setTimeout(check,check.delay)}
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}
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});
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});
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HUB.Register.StartupHook("SVG Jax Ready",function () {
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var SVG = MathJax.OutputJax.SVG;
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var POSTTRANSLATE = SVG.postTranslate;
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SVG.Augment({
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postTranslate: function (state,partial) {
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if (!partial && CONFIG.matchFor.SVG) {
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//
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// Check for changes in the web fonts that might affect the font
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// size for math elements. This is a periodic check that goes on
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// until a timeout is reached.
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//
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AJAX.timer.start(AJAX,["checkFonts",this,state.jax[this.id]],
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CONFIG.fontCheckDelay,CONFIG.fontCheckTimeout);
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}
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return POSTTRANSLATE.apply(this,arguments); // do the original function
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},
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checkFonts: function (check,scripts) {
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if (check.time(function () {})) return;
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var size = [], i, m, retry = false;
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//
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// Add the elements used for testing ex and em sizes
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//
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i];
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if (script.parentNode && script.MathJax.elementJax) {
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script.parentNode.insertBefore(this.ExSpan.cloneNode(true),script);
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}
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}
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//
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// Check to see if anything has changed
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//
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i]; if (!script.parentNode) continue; retry = true;
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var jax = script.MathJax.elementJax; if (!jax) continue;
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//
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// Check if ex or mex has changed
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//
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var test = script.previousSibling;
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var ex = test.firstChild.offsetHeight/60;
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if (ex === 0 || ex === "NaN") {ex = this.defaultEx}
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if (ex !== jax.SVG.ex) {size.push(script); scripts[i] = {}}
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}
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//
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// Remove markers
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//
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scripts = scripts.concat(size); // some scripts have been moved to the size array
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i];
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if (script.parentNode && script.MathJax.elementJax) {
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script.parentNode.removeChild(script.previousSibling);
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}
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}
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//
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// Rerender the changed items
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//
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if (size.length) {HUB.Queue(["Rerender",HUB,[size],{}])}
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//
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// Try again later (if not all the scripts are null)
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//
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if (retry) setTimeout(check,check.delay);
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}
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});
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});
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HUB.Register.StartupHook("NativeMML Jax Ready",function () {
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var nMML = MathJax.OutputJax.NativeMML;
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var POSTTRANSLATE = nMML.postTranslate;
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nMML.Augment({
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postTranslate: function (state) {
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if (!HUB.Browser.isMSIE && CONFIG.matchFor.NativeMML) {
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//
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// Check for changes in the web fonts that might affect the sizes
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// of math elements. This is a periodic check that goes on until
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// a timeout is reached.
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//
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AJAX.timer.start(AJAX,["checkFonts",this,state.jax[this.id]],
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CONFIG.fontCheckDelay,CONFIG.fontCheckTimeout);
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}
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POSTTRANSLATE.apply(this,arguments); // do the original routine
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},
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//
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// Check to see if web fonts have been loaded that change the ex size
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// of the surrounding font, the ex size within the math, or the widths
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// of math elements. We do this by rechecking the ex and mex sizes
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// (to see if the font scaling needs adjusting) and by checking the
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// size of the inner mrow of math elements and mtd elements. The
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// sizes of these have been stored in the NativeMML object of the
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// element jax so that we can check for them here.
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//
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checkFonts: function (check,scripts) {
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if (check.time(function () {})) return;
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var adjust = [], mtd = [], size = [], i, m, script;
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//
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// Add the elements used for testing ex and em sizes
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//
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i];
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if (script.parentNode && script.MathJax.elementJax) {
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script.parentNode.insertBefore(this.EmExSpan.cloneNode(true),script);
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}
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}
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//
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// Check to see if anything has changed
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//
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i]; if (!script.parentNode) continue;
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var jax = script.MathJax.elementJax; if (!jax) continue;
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var span = document.getElementById(jax.inputID+"-Frame");
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var math = span.getElementsByTagName("math")[0]; if (!math) continue;
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jax = jax.NativeMML;
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//
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// Check if ex or mex has changed
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//
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var test = script.previousSibling;
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var ex = test.firstChild.offsetWidth/60;
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var mex = test.lastChild.offsetWidth/60;
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if (ex === 0 || ex === "NaN") {ex = this.defaultEx; mex = this.defaultMEx}
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var newEx = (ex !== jax.ex);
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if (newEx || mex != jax.mex) {
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var scale = (this.config.matchFontHeight && mex > 1 ? ex/mex : 1);
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scale = Math.floor(Math.max(this.config.minScaleAdjust/100,scale) * this.config.scale);
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if (scale/100 !== jax.scale) {size.push([span.style,scale])}
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jax.scale = scale/100; jax.fontScale = scale+"%"; jax.ex = ex; jax.mex = mex;
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}
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//
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// Check width of math elements
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//
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if ("scrollWidth" in jax && (newEx || jax.scrollWidth !== math.firstChild.scrollWidth)) {
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jax.scrollWidth = math.firstChild.scrollWidth;
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adjust.push([math.parentNode.style,jax.scrollWidth/jax.ex/jax.scale]);
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}
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//
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// Check widths of mtd elements
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//
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if (math.MathJaxMtds) {
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for (var j = 0, n = math.MathJaxMtds.length; j < n; j++) {
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if (!math.MathJaxMtds[j].parentNode) continue;
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if (newEx || math.MathJaxMtds[j].firstChild.scrollWidth !== jax.mtds[j]) {
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jax.mtds[j] = math.MathJaxMtds[j].firstChild.scrollWidth;
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mtd.push([math.MathJaxMtds[j],jax.mtds[j]/jax.ex]);
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}
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}
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}
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}
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//
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// Remove markers
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//
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for (i = 0, m = scripts.length; i < m; i++) {
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script = scripts[i];
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if (script.parentNode && script.MathJax.elementJax) {
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script.parentNode.removeChild(script.previousSibling);
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}
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}
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//
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// Adjust scaling factor
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//
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for (i = 0, m = size.length; i < m; i++) {
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size[i][0].fontSize = size[i][1] + "%";
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}
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//
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// Adjust width of spans containing math elements that have changed
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//
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for (i = 0, m = adjust.length; i < m; i++) {
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adjust[i][0].width = adjust[i][1].toFixed(3)+"ex";
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}
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//
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// Adjust widths of mtd elements that have changed
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//
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for (i = 0, m = mtd.length; i < m; i++) {
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var style = mtd[i][0].getAttribute("style");
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style = style.replace(/(($|;)\s*min-width:).*?ex/,"$1 "+mtd[i][1].toFixed(3)+"ex");
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mtd[i][0].setAttribute("style",style);
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}
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//
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// Try again later
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//
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setTimeout(check,check.delay);
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}
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});
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});
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HUB.Startup.signal.Post("MatchWebFonts Extension Ready");
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AJAX.loadComplete("[MathJax]/extensions/MatchWebFonts.js");
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})(MathJax.Hub,MathJax.Ajax);
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