140 lines
4.7 KiB
JavaScript
140 lines
4.7 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/CHTML-preview.js
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*
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* Implements a fast preview using the Common-HTML output jax
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* and then a slower update to the more accurate HTML-CSS output
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* (or whatever the user has selected).
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2014 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,HTML) {
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var SETTINGS = HUB.config.menuSettings;
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var CHTMLpreview = MathJax.Extension["CHTML-preview"] = {
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version: "2.5.0-beta",
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//
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// Configuration for the chunking of the main output
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// after the previews have been created, and other configuration.
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//
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config: HUB.CombineConfig("CHTML-preview",{
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Chunks: {EqnChunk: 10000, EqnChunkFactor: 1, EqnChunkDelay: 0},
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color: "inherit!important",
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updateTime: 30, updateDelay: 6,
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messageStyle: "none",
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disabled: false
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}),
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//
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// Ajust the chunking of the output jax
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//
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Config: function () {
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HUB.Config({
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"HTML-CSS": this.config.Chunks,
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SVG: this.config.Chunks,
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});
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MathJax.Ajax.Styles({".MathJax_Preview .MJXc-math":{color:this.config.color}});
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var update, delay, style, done, saved;
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var config = this.config;
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if (!config.disabled && SETTINGS.CHTMLpreview == null)
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HUB.Config({menuSettings:{CHTMLpreview:true}});
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HUB.Register.MessageHook("Begin Math Output",function () {
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if (!done && SETTINGS.CHTMLpreview && SETTINGS.renderer !== "CommonHTML") {
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update = HUB.processUpdateTime; delay = HUB.processUpdateDelay;
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style = HUB.config.messageStyle;
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HUB.processUpdateTime = config.updateTime;
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HUB.processUpdateDelay = config.updateDelay;
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HUB.Config({messageStyle: config.messageStyle});
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MathJax.Message.Clear(0,0);
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saved = true;
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}
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});
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HUB.Register.MessageHook("End Math Output",function () {
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if (!done && saved) {
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HUB.processUpdateTime = update;
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HUB.processUpdateDelay = delay;
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HUB.Config({messageStyle: style});
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done = true;
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}
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});
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},
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//
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// Insert a preview span, if there isn't one already,
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// and call the CommonHTML output jax to create the preview
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//
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Preview: function (data) {
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if (!SETTINGS.CHTMLpreview || SETTINGS.renderer === "CommonHTML") return;
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var preview = data.script.MathJax.preview || data.script.previousSibling;
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if (!preview || preview.className !== MathJax.Hub.config.preRemoveClass) {
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preview = HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass});
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data.script.parentNode.insertBefore(preview,data.script);
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data.script.MathJax.preview = preview;
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}
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preview.innerHTML = ""; preview.style.color = "inherit";
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return this.postFilter(preview,data);
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},
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postFilter: function (preview,data) {
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//
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// Load the CommonHTML jax if it is not already loaded
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//
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if (!data.math.root.toCommonHTML) {
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var queue = MathJax.Callback.Queue();
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queue.Push(
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["Require",MathJax.Ajax,"[MathJax]/jax/output/CommonHTML/config.js"],
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["Require",MathJax.Ajax,"[MathJax]/jax/output/CommonHTML/jax.js"]
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);
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HUB.RestartAfter(queue.Push({}));
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}
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data.math.root.toCommonHTML(preview);
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},
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//
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// Hook into the input jax postFilter to create the previews as
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// the input jax are processed.
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//
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Register: function (name) {
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HUB.Register.StartupHook(name+" Jax Require",function () {
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var jax = MathJax.InputJax[name];
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jax.postfilterHooks.Add(["Preview",MathJax.Extension["CHTML-preview"]],50);
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});
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}
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}
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//
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// Hook into each input jax
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//
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CHTMLpreview.Register("TeX");
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CHTMLpreview.Register("MathML");
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CHTMLpreview.Register("AsciiMath");
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HUB.Register.StartupHook("End Config",["Config",CHTMLpreview]);
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HUB.Startup.signal.Post("CHTML-preview Ready");
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})(MathJax.Hub,MathJax.HTML);
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MathJax.Ajax.loadComplete("[MathJax]/extensions/CHTML-preview.js");
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