1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// @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/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
|
