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// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7dn=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/fast-preview.js
*
* Implements a fast preview using the PreviewHTML output jax
* and then a slower update to the more accurate HTML-CSS output
* (or whatever the user has selected).
*
* ---------------------------------------------------------------------
*
* Copyright (c) 2014-2020 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,BROWSER) {
var SETTINGS = HUB.config.menuSettings;
var JAX = MathJax.OutputJax;
var msieColorBug = BROWSER.isMSIE && (document.documentMode||0) < 8;
var FastPreview = MathJax.Extension["fast-preview"] = {
version: "2.7.9",
enabled: true,
//
// Configuration for the chunking of the main output
// after the previews have been created, and other configuration.
//
config: HUB.CombineConfig("fast-preview",{
Chunks: {EqnChunk: 10000, EqnChunkFactor: 1, EqnChunkDelay: 0},
color: "inherit!important",
updateTime: 30, updateDelay: 6,
messageStyle: "none",
disabled: BROWSER.isMSIE && !BROWSER.versionAtLeast("8.0")
}),
//
// Ajust the chunking of the output jax
//
Config: function () {
if (HUB.config["CHTML-preview"])
MathJax.Hub.Config({"fast-preview": HUB.config["CHTML-preview"]});
var update, delay, style, done, saved;
var config = this.config;
if (!config.disabled && SETTINGS.FastPreview == null)
HUB.Config({menuSettings:{FastPreview:true}});
if (SETTINGS.FastPreview) {
MathJax.Ajax.Styles({".MathJax_Preview .MJXf-math":{color:config.color}});
HUB.Config({"HTML-CSS": config.Chunks, CommonHTML: config.Chunks, SVG: config.Chunks});
}
HUB.Register.MessageHook("Begin Math Output",function () {
if (!done && FastPreview.Active()) {
update = HUB.processUpdateTime; delay = HUB.processUpdateDelay;
style = HUB.config.messageStyle;
HUB.processUpdateTime = config.updateTime;
HUB.processUpdateDelay = config.updateDelay;
HUB.Config({messageStyle: config.messageStyle});
MathJax.Message.Clear(0,0);
saved = true;
}
});
HUB.Register.MessageHook("End Math Output",function () {
if (!done && saved) {
HUB.processUpdateTime = update;
HUB.processUpdateDelay = delay;
HUB.Config({messageStyle: style});
done = true;
}
});
},
//
// Allow page to override user settings (for things like editor previews)
//
Disable: function () {this.enabled = false},
Enable: function () {this.enabled = true},
Active: function () {
return SETTINGS.FastPreview && this.enabled &&
!(JAX[SETTINGS.renderer]||{}).noFastPreview;
},
//
// Insert a preview span, if there isn't one already,
// and call the PreviewHTML output jax to create the preview
//
Preview: function (data) {
if (!this.Active() || !data.script.parentNode) return;
var preview = data.script.MathJax.preview || data.script.previousSibling;
if (!preview || preview.className !== MathJax.Hub.config.preRemoveClass) {
preview = HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass});
data.script.parentNode.insertBefore(preview,data.script);
data.script.MathJax.preview = preview;
}
preview.innerHTML = "";
preview.style.color = (msieColorBug ? "black" : "inherit");
return this.postFilter(preview,data);
},
postFilter: function (preview,data) {
//
// Load the PreviewHTML jax if it is not already loaded
//
if (!data.math.root.toPreviewHTML) {
var queue = MathJax.Callback.Queue();
queue.Push(
["Require",MathJax.Ajax,"[MathJax]/jax/output/PreviewHTML/config.js"],
["Require",MathJax.Ajax,"[MathJax]/jax/output/PreviewHTML/jax.js"]
);
HUB.RestartAfter(queue.Push({}));
}
data.math.root.toPreviewHTML(preview);
},
//
// Hook into the input jax postFilter to create the previews as
// the input jax are processed.
//
Register: function (name) {
HUB.Register.StartupHook(name+" Jax Require",function () {
var jax = MathJax.InputJax[name];
jax.postfilterHooks.Add(["Preview",MathJax.Extension["fast-preview"]],50);
});
}
}
//
// Hook into each input jax
//
FastPreview.Register("TeX");
FastPreview.Register("MathML");
FastPreview.Register("AsciiMath");
HUB.Register.StartupHook("End Config",["Config",FastPreview]);
HUB.Startup.signal.Post("fast-preview Ready");
})(MathJax.Hub,MathJax.HTML,MathJax.Hub.Browser);
MathJax.Ajax.loadComplete("[MathJax]/extensions/fast-preview.js");
// @license-end
|
