287 lines
12 KiB
JavaScript
287 lines
12 KiB
JavaScript
/*************************************************************
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*
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* MathJax/extensions/FontWarnings.js
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*
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* Implements a font warning message window that appears when
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* the image fonts, no fonts, or web fonts are used, informing
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* the user where to download the fonts, or to update to a more
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* modern browser. The window will fade out automatically after
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* a time, and the user can dismiss it by a close box.
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*
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* To include font warning messages, add "FontWarnings.js" to the
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* extensions array in your MathJax configuration.
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*
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* You can customize the warning messages in a number of ways. Use the
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* FontWarnings section of the configuration to specify any of the items
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* shown in the CONFIG variable below. These include
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*
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* messageStyle the style to apply to the warning box that is
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* displayed when MathJax uses one of its fallback
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* methods.
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*
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* removeAfter the amount of time to show the warning message (in ms)
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* fadeoutTime how long the message should take to fade out
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* fadeoutSteps how many separate steps to use during the fade out
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* (set to 0 to use no fadeout and simply remove the window)
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*
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* Messages stores the descriptions of the messages to use for the
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* various warnings (webFonts, imageFonts, and noFonts).
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* These are arrays of strings to be inserted into the window,
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* or identifiers within brackets, which refer to the HTML
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* snippets in the HTML section described below. To disable a
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* specific message, set its value to null (see example below).
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*
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* HTML stores snippets of HTML descriptions for various
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* common parts of the error messages. These include
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* the closeBox, the message about web fonts being available
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* in modern browser, and messages about downloadable fonts.
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* The STIX and TeX font messages are used when only one
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* of these is in the availableFonts list. The data for these
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* are arrays of either strings to include or a description of
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* an HTML item enclosed in square brackets. That description
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* has (up to) three parts: the name of the tag to be included,
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* a list (enclosed in braces) of attributes and their values
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* to be set on the tag (optional), and an array of the contents
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* of the tag (optional). See the definitions below for examples.
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*
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* For example,
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*
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* MathJax.Hub.Config({
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* ...
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* extensions: ["FontWarnings.js"],
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* FontWarnings: {
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* removeAfter: 20*1000, // 20 seconds
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* messageStyle: {
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* border: "2px solid black",
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* padding: "2em"
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* },
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* Message: {
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* webFont: null // no webfont messages (only image and no fonts)
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* }
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* }
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* });
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*
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* would extend the time the message is displayed from 12 seconds to 20,
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* and changes the border to a solid black one, with 2em of padding
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* rather than the default of 1em.
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2010-2012 Design Science, Inc.
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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 VERSION = "2.0";
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var CONFIG = HUB.CombineConfig("FontWarnings",{
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//
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// The CSS for the message window
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//
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messageStyle: {
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position:"fixed", bottom:"4em", left:"3em", width:"40em",
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border: "3px solid #880000", "background-color": "#E0E0E0", color: "black",
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padding: "1em", "font-size":"small", "white-space":"normal",
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"border-radius": ".75em", // Opera 10.5 and IE9
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"-webkit-border-radius": ".75em", // Safari and Chrome
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"-moz-border-radius": ".75em", // Firefox
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"-khtml-border-radius": ".75em", // Konqueror
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"box-shadow": "4px 4px 10px #AAAAAA", // Opera 10.5 and IE9
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"-webkit-box-shadow": "4px 4px 10px #AAAAAA", // Safari 3 and Chrome
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"-moz-box-shadow": "4px 4px 10px #AAAAAA", // Forefox 3.5
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"-khtml-box-shadow": "4px 4px 10px #AAAAAA", // Konqueror
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filter: "progid:DXImageTransform.Microsoft.dropshadow(OffX=3, OffY=3, Color='gray', Positive='true')" // IE
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},
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//
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// The messages for the various situations
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//
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Message: {
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webFont: [
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["closeBox"],
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"MathJax is using web-based fonts to display the mathematics ",
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"on this page. These take time to download, so the page would ",
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"render faster if you installed math fonts directly in your ",
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"system's font folder.",
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["fonts"]
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],
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imageFonts: [
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["closeBox"],
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"MathJax is using its image fonts rather than local or web-based fonts. ",
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"This will render slower than usual, and the mathematics may not print ",
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"at the full resolution of your printer.",
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["fonts"],
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["webfonts"]
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],
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noFonts: [
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["closeBox"],
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"MathJax is unable to locate a font to use to display ",
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"its mathematics, and image fonts are not available, so it ",
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"is falling back on generic unicode characters in hopes that ",
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"your browser will be able to display them. Some characters ",
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"may not show up properly, or possibly not at all.",
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["fonts"],
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["webfonts"]
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]
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},
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//
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// HTML objects that can be referred to in the message definitions
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//
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HTML: {
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//
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// The definition of the close box
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//
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closeBox: [[
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"div",{
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style: {
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position:"absolute", overflow:"hidden", top:".1em", right:".1em",
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border: "1px outset", width:"1em", height:"1em",
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"text-align": "center", cursor: "pointer",
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"background-color": "#EEEEEE", color:"#606060",
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"border-radius": ".5em", // Opera 10.5
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"-webkit-border-radius": ".5em", // Safari and Chrome
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"-moz-border-radius": ".5em", // Firefox
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"-khtml-border-radius": ".5em" // Konqueror
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},
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onclick: function () {
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if (DATA.div && DATA.fade === 0)
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{if (DATA.timer) {clearTimeout(DATA.timer)}; DATA.div.style.display = "none"}
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}
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},
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[["span",{style:{position:"relative", bottom:".2em"}},["x"]]]
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]],
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webfonts: [
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["p"],
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"Most modern browsers allow for fonts to be downloaded over the web. ",
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"Updating to a more recent version of your browser (or changing browsers) ",
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"could improve the quality of the mathematics on this page."
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],
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fonts: [
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["p"],
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"MathJax can use either the ",
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["a",{href:"http://www.stixfonts.org/",target:"_blank"},"STIX fonts"],
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" or the ",
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["a",{href:"http://www.mathjax.org/help-v2/fonts/",target:"_blank"},["MathJax TeX fonts"]],
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". Download and install either one to improve your MathJax experience."
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],
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STIXfonts: [
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["p"],
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"This page is designed to use the ",
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["a",{href:"http://www.stixfonts.org/",target:"_blank"},"STIX fonts"],
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". Download and install those fonts to improve your MathJax experience."
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],
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TeXfonts: [
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["p"],
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"This page is designed to use the ",
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["a",{href:"http://www.mathjax.org/help-v2/fonts/",target:"_blank"},["MathJax TeX fonts"]],
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". Download and install those fonts to improve your MathJax experience."
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]
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},
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removeAfter: 12*1000, // time to show message (in ms)
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fadeoutSteps: 10, // fade-out steps
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fadeoutTime: 1.5*1000 // fadeout over this amount of time (in ms)
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});
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if (MathJax.Hub.Browser.isIE9 && document.documentMode >= 9)
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{delete CONFIG.messageStyle.filter}
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//
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// Data for the window
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//
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var DATA = {
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div: null, // the message window, when displayed
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fade: 0 // number of fade-out steps so far
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};
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//
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// Create the message window and start the fade-out timer
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//
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var CREATEMESSAGE = function (data) {
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if (DATA.div) return;
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var HTMLCSS = MathJax.OutputJax["HTML-CSS"], frame = document.body;
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if (HUB.Browser.isMSIE) {
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if (CONFIG.messageStyle.position === "fixed") {
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MathJax.Message.Init(); // make sure MathJax_MSIE_frame exists
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frame = document.getElementById("MathJax_MSIE_Frame");
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CONFIG.messageStyle.position = "absolute";
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}
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} else {delete CONFIG.messageStyle.filter}
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CONFIG.messageStyle.maxWidth = (document.body.clientWidth-75) + "px";
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var i = 0; while (i < data.length) {
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if (data[i] instanceof Array && CONFIG.HTML[data[i][0]])
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{data.splice.apply(data,[i,1].concat(CONFIG.HTML[data[i][0]]))} else {i++}
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}
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DATA.div = HTMLCSS.addElement(frame,"div",{id:"MathJax_FontWarning",style:CONFIG.messageStyle},data);
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if (CONFIG.removeAfter) {
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HUB.Register.StartupHook("End",function ()
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{DATA.timer = setTimeout(FADEOUT,CONFIG.removeAfter)});
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}
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HTML.Cookie.Set("fontWarn",{warned:true});
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};
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//
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// Set the opacity based on the number of steps taken so far
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// and remove the window when it gets to 0
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//
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var FADEOUT = function () {
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DATA.fade++; if (DATA.timer) {delete DATA.timer}
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if (DATA.fade < CONFIG.fadeoutSteps) {
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var opacity = 1 - DATA.fade/CONFIG.fadeoutSteps;
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DATA.div.style.opacity = opacity;
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DATA.div.style.filter = "alpha(opacity="+Math.floor(100*opacity)+")";
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setTimeout(FADEOUT,CONFIG.fadeoutTime/CONFIG.fadeoutSteps);
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} else {
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DATA.div.style.display = "none";
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}
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};
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//
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// Check that we haven't already issued a warning
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//
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if (!HTML.Cookie.Get("fontWarn").warned) {
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//
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// Hook into the Startup signal and look for font warning messages.
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// When one comes, issue the correct message.
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//
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HUB.Startup.signal.Interest(function (message) {
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if (message.match(/HTML-CSS Jax - /) && !DATA.div) {
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var HTMLCSS = MathJax.OutputJax["HTML-CSS"], FONTS = HTMLCSS.config.availableFonts, MSG;
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var localFonts = (FONTS && FONTS.length);
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if (!localFonts) {CONFIG.HTML.fonts = [""]}
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else if (FONTS.length === 1) {CONFIG.HTML.fonts = CONFIG.HTML[FONTS[0]+"fonts"]}
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if (HTMLCSS.allowWebFonts) {CONFIG.HTML.webfonts = [""]}
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if (message.match(/- Web-Font/)) {if (localFonts) {MSG = "webFont"}}
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else if (message.match(/- using image fonts/)) {MSG = "imageFonts"}
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else if (message.match(/- no valid font/)) {MSG = "noFonts"}
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if (MSG && CONFIG.Message[MSG]) {CREATEMESSAGE(CONFIG.Message[MSG])}
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}
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});
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}
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})(MathJax.Hub,MathJax.HTML);
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MathJax.Ajax.loadComplete("[MathJax]/extensions/FontWarnings.js");
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