570 lines
20 KiB
JavaScript
570 lines
20 KiB
JavaScript
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/* -*- 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/MathEvents.js
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*
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* Implements the event handlers needed by the output jax to perform
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* menu, hover, and other events.
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*
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* ---------------------------------------------------------------------
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*
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* Copyright (c) 2011-2013 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,AJAX,CALLBACK,LOCALE,OUTPUT,INPUT) {
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var VERSION = "2.3";
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var EXTENSION = MathJax.Extension;
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var ME = EXTENSION.MathEvents = {version: VERSION};
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var SETTINGS = HUB.config.menuSettings;
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var CONFIG = {
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hover: 500, // time required to be considered a hover
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frame: {
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x: 3.5, y: 5, // frame padding and
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bwidth: 1, // frame border width (in pixels)
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bcolor: "#A6D", // frame border color
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hwidth: "15px", // haze width
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hcolor: "#83A" // haze color
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},
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button: {
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x: -4, y: -3, // menu button offsets
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wx: -2, // button offset for full-width equations
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src: AJAX.fileURL(OUTPUT.imageDir+"/MenuArrow-15.png") // button image
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},
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fadeinInc: .2, // increment for fade-in
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fadeoutInc: .05, // increment for fade-out
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fadeDelay: 50, // delay between fade-in or fade-out steps
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fadeoutStart: 400, // delay before fade-out after mouseout
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fadeoutDelay: 15*1000, // delay before automatic fade-out
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styles: {
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".MathJax_Hover_Frame": {
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"border-radius": ".25em", // Opera 10.5 and IE9
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"-webkit-border-radius": ".25em", // Safari and Chrome
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"-moz-border-radius": ".25em", // Firefox
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"-khtml-border-radius": ".25em", // Konqueror
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"box-shadow": "0px 0px 15px #83A", // Opera 10.5 and IE9
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"-webkit-box-shadow": "0px 0px 15px #83A", // Safari and Chrome
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"-moz-box-shadow": "0px 0px 15px #83A", // Forefox
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"-khtml-box-shadow": "0px 0px 15px #83A", // Konqueror
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border: "1px solid #A6D ! important",
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display: "inline-block", position:"absolute"
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},
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".MathJax_Hover_Arrow": {
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position:"absolute",
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width:"15px", height:"11px",
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cursor:"pointer"
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}
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}
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};
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//
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// Common event-handling code
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//
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var EVENT = ME.Event = {
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LEFTBUTTON: 0, // the event.button value for left button
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RIGHTBUTTON: 2, // the event.button value for right button
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MENUKEY: "altKey", // the event value for alternate context menu
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Mousedown: function (event) {return EVENT.Handler(event,"Mousedown",this)},
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Mouseup: function (event) {return EVENT.Handler(event,"Mouseup",this)},
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Mousemove: function (event) {return EVENT.Handler(event,"Mousemove",this)},
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Mouseover: function (event) {return EVENT.Handler(event,"Mouseover",this)},
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Mouseout: function (event) {return EVENT.Handler(event,"Mouseout",this)},
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Click: function (event) {return EVENT.Handler(event,"Click",this)},
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DblClick: function (event) {return EVENT.Handler(event,"DblClick",this)},
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Menu: function (event) {return EVENT.Handler(event,"ContextMenu",this)},
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//
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// Call the output jax's event handler or the zoom handler
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//
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Handler: function (event,type,math) {
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if (AJAX.loadingMathMenu) {return EVENT.False(event)}
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var jax = OUTPUT[math.jaxID];
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if (!event) {event = window.event}
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event.isContextMenu = (type === "ContextMenu");
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if (jax[type]) {return jax[type](event,math)}
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if (EXTENSION.MathZoom) {return EXTENSION.MathZoom.HandleEvent(event,type,math)}
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},
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//
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// Try to cancel the event in every way we can
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//
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False: function (event) {
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if (!event) {event = window.event}
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if (event) {
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if (event.preventDefault) {event.preventDefault()}
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if (event.stopPropagation) {event.stopPropagation()}
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event.cancelBubble = true;
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event.returnValue = false;
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}
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return false;
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},
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//
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// Load the contextual menu code, if needed, and post the menu
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//
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ContextMenu: function (event,math,force) {
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//
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// Check if we are showing menus
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//
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var JAX = OUTPUT[math.jaxID], jax = JAX.getJaxFromMath(math);
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var show = (JAX.config.showMathMenu != null ? JAX : HUB).config.showMathMenu;
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if (!show || (SETTINGS.context !== "MathJax" && !force)) return;
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//
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// Remove selections, remove hover fades
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//
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if (ME.msieEventBug) {event = window.event || event}
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EVENT.ClearSelection(); HOVER.ClearHoverTimer();
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if (jax.hover) {
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if (jax.hover.remove) {clearTimeout(jax.hover.remove); delete jax.hover.remove}
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jax.hover.nofade = true;
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}
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//
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// If the menu code is loaded,
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// Check if localization needs loading;
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// If not, post the menu, and return.
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// Otherwise wait for the localization to load
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// Otherwse load the menu code.
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// Try again after the file is loaded.
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//
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var MENU = MathJax.Menu; var load, fn;
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if (MENU) {
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if (MENU.loadingDomain) {return EVENT.False(event)}
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load = LOCALE.loadDomain("MathMenu");
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if (!load) {
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MENU.jax = jax;
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var source = MENU.menu.Find("Show Math As").menu;
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source.items[0].name = jax.sourceMenuTitle;
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source.items[0].format = (jax.sourceMenuFormat||"MathML");
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source.items[1].name = INPUT[jax.inputJax].sourceMenuTitle;
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//
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// Try and find each known annotation format and enable the menu
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// items accordingly.
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//
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var annotations = source.items[2]; annotations.disabled = true;
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var annotationItems = annotations.menu.items;
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annotationList = MathJax.Hub.Config.semanticsAnnotations;
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for (var i = 0, m = annotationItems.length; i < m; i++) {
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var name = annotationItems[i].name[1]
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if (jax.root && jax.root.getAnnotation(name) !== null) {
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annotations.disabled = false;
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annotationItems[i].hidden = false;
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} else {
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annotationItems[i].hidden = true;
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}
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}
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var MathPlayer = MENU.menu.Find("Math Settings","MathPlayer");
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MathPlayer.hidden = !(jax.outputJax === "NativeMML" && HUB.Browser.hasMathPlayer);
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return MENU.menu.Post(event);
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}
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MENU.loadingDomain = true;
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fn = function () {delete MENU.loadingDomain};
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} else {
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if (AJAX.loadingMathMenu) {return EVENT.False(event)}
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AJAX.loadingMathMenu = true;
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load = AJAX.Require("[MathJax]/extensions/MathMenu.js");
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fn = function () {
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delete AJAX.loadingMathMenu;
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if (!MathJax.Menu) {MathJax.Menu = {}}
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}
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}
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var ev = {
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pageX:event.pageX, pageY:event.pageY,
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clientX:event.clientX, clientY:event.clientY
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};
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CALLBACK.Queue(
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load, fn, // load the file and delete the marker when done
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["ContextMenu",EVENT,ev,math,force] // call this function again
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);
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return EVENT.False(event);
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},
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//
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// Mousedown handler for alternate means of accessing menu
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//
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AltContextMenu: function (event,math) {
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var JAX = OUTPUT[math.jaxID];
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var show = (JAX.config.showMathMenu != null ? JAX : HUB).config.showMathMenu;
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if (show) {
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show = (JAX.config.showMathMenuMSIE != null ? JAX : HUB).config.showMathMenuMSIE;
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if (SETTINGS.context === "MathJax" && !SETTINGS.mpContext && show) {
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if (!ME.noContextMenuBug || event.button !== EVENT.RIGHTBUTTON) return;
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} else {
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if (!event[EVENT.MENUKEY] || event.button !== EVENT.LEFTBUTTON) return;
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}
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return JAX.ContextMenu(event,math,true);
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}
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},
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ClearSelection: function () {
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if (ME.safariContextMenuBug) {setTimeout("window.getSelection().empty()",0)}
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if (document.selection) {setTimeout("document.selection.empty()",0)}
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},
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getBBox: function (span) {
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span.appendChild(ME.topImg);
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var h = ME.topImg.offsetTop, d = span.offsetHeight-h, w = span.offsetWidth;
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span.removeChild(ME.topImg);
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return {w:w, h:h, d:d};
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}
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};
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//
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// Handle hover "discoverability"
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//
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var HOVER = ME.Hover = {
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//
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// Check if we are moving from a non-MathJax element to a MathJax one
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// and either start fading in again (if it is fading out) or start the
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// timer for the hover
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//
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Mouseover: function (event,math) {
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if (SETTINGS.discoverable || SETTINGS.zoom === "Hover") {
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var from = event.fromElement || event.relatedTarget,
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to = event.toElement || event.target;
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if (from && to && (from.isMathJax != to.isMathJax ||
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HUB.getJaxFor(from) !== HUB.getJaxFor(to))) {
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var jax = this.getJaxFromMath(math);
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if (jax.hover) {HOVER.ReHover(jax)} else {HOVER.HoverTimer(jax,math)}
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return EVENT.False(event);
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}
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}
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},
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//
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// Check if we are moving from a MathJax element to a non-MathJax one
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// and either start fading out, or clear the timer if we haven't
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// hovered yet
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//
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Mouseout: function (event,math) {
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if (SETTINGS.discoverable || SETTINGS.zoom === "Hover") {
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var from = event.fromElement || event.relatedTarget,
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to = event.toElement || event.target;
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if (from && to && (from.isMathJax != to.isMathJax ||
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HUB.getJaxFor(from) !== HUB.getJaxFor(to))) {
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var jax = this.getJaxFromMath(math);
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if (jax.hover) {HOVER.UnHover(jax)} else {HOVER.ClearHoverTimer()}
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return EVENT.False(event);
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}
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}
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},
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//
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// Restart hover timer if the mouse moves
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//
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Mousemove: function (event,math) {
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if (SETTINGS.discoverable || SETTINGS.zoom === "Hover") {
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var jax = this.getJaxFromMath(math); if (jax.hover) return;
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if (HOVER.lastX == event.clientX && HOVER.lastY == event.clientY) return;
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HOVER.lastX = event.clientX; HOVER.lastY = event.clientY;
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HOVER.HoverTimer(jax,math);
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return EVENT.False(event);
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}
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},
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//
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// Clear the old timer and start a new one
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//
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HoverTimer: function (jax,math) {
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this.ClearHoverTimer();
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this.hoverTimer = setTimeout(CALLBACK(["Hover",this,jax,math]),CONFIG.hover);
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},
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ClearHoverTimer: function () {
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if (this.hoverTimer) {clearTimeout(this.hoverTimer); delete this.hoverTimer}
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},
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//
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// Handle putting up the hover frame
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//
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Hover: function (jax,math) {
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//
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// Check if Zoom handles the hover event
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//
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if (EXTENSION.MathZoom && EXTENSION.MathZoom.Hover({},math)) return;
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//
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// Get the hover data
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//
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var JAX = OUTPUT[jax.outputJax],
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span = JAX.getHoverSpan(jax,math),
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bbox = JAX.getHoverBBox(jax,span,math),
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show = (JAX.config.showMathMenu != null ? JAX : HUB).config.showMathMenu;
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var dx = CONFIG.frame.x, dy = CONFIG.frame.y, dd = CONFIG.frame.bwidth; // frame size
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if (ME.msieBorderWidthBug) {dd = 0}
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jax.hover = {opacity:0, id:jax.inputID+"-Hover"};
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//
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// The frame and menu button
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//
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var frame = HTML.Element("span",{
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id:jax.hover.id, isMathJax: true,
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style:{display:"inline-block", width:0, height:0, position:"relative"}
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},[["span",{
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className:"MathJax_Hover_Frame", isMathJax: true,
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style:{
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display:"inline-block", position:"absolute",
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top:this.Px(-bbox.h-dy-dd-(bbox.y||0)), left:this.Px(-dx-dd+(bbox.x||0)),
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width:this.Px(bbox.w+2*dx), height:this.Px(bbox.h+bbox.d+2*dy),
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opacity:0, filter:"alpha(opacity=0)"
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}}
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]]
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);
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var button = HTML.Element("span",{
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isMathJax: true, id:jax.hover.id+"Menu",
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style:{display:"inline-block", "z-index": 1, width:0, height:0, position:"relative"}
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},[["img",{
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className: "MathJax_Hover_Arrow", isMathJax: true, math: math,
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src: CONFIG.button.src, onclick: this.HoverMenu, jax:JAX.id,
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style: {
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left:this.Px(bbox.w+dx+dd+(bbox.x||0)+CONFIG.button.x),
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top:this.Px(-bbox.h-dy-dd-(bbox.y||0)-CONFIG.button.y),
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||
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|
opacity:0, filter:"alpha(opacity=0)"
|
||
|
|
}
|
||
|
|
}]]
|
||
|
|
);
|
||
|
|
if (bbox.width) {
|
||
|
|
frame.style.width = button.style.width = bbox.width;
|
||
|
|
frame.style.marginRight = button.style.marginRight = "-"+bbox.width;
|
||
|
|
frame.firstChild.style.width = bbox.width;
|
||
|
|
button.firstChild.style.left = "";
|
||
|
|
button.firstChild.style.right = this.Px(CONFIG.button.wx);
|
||
|
|
}
|
||
|
|
//
|
||
|
|
// Add the frame and button
|
||
|
|
//
|
||
|
|
span.parentNode.insertBefore(frame,span);
|
||
|
|
if (show) {span.parentNode.insertBefore(button,span)}
|
||
|
|
if (span.style) {span.style.position = "relative"} // so math is on top of hover frame
|
||
|
|
//
|
||
|
|
// Start the hover fade-in
|
||
|
|
//
|
||
|
|
this.ReHover(jax);
|
||
|
|
},
|
||
|
|
//
|
||
|
|
// Restart the hover fade in and fade-out timers
|
||
|
|
//
|
||
|
|
ReHover: function (jax) {
|
||
|
|
if (jax.hover.remove) {clearTimeout(jax.hover.remove)}
|
||
|
|
jax.hover.remove = setTimeout(CALLBACK(["UnHover",this,jax]),CONFIG.fadeoutDelay);
|
||
|
|
this.HoverFadeTimer(jax,CONFIG.fadeinInc);
|
||
|
|
},
|
||
|
|
//
|
||
|
|
// Start the fade-out
|
||
|
|
//
|
||
|
|
UnHover: function (jax) {
|
||
|
|
if (!jax.hover.nofade) {this.HoverFadeTimer(jax,-CONFIG.fadeoutInc,CONFIG.fadeoutStart)}
|
||
|
|
},
|
||
|
|
//
|
||
|
|
// Handle the fade-in and fade-out
|
||
|
|
//
|
||
|
|
HoverFade: function (jax) {
|
||
|
|
delete jax.hover.timer;
|
||
|
|
jax.hover.opacity = Math.max(0,Math.min(1,jax.hover.opacity + jax.hover.inc));
|
||
|
|
jax.hover.opacity = Math.floor(1000*jax.hover.opacity)/1000;
|
||
|
|
var frame = document.getElementById(jax.hover.id),
|
||
|
|
button = document.getElementById(jax.hover.id+"Menu");
|
||
|
|
frame.firstChild.style.opacity = jax.hover.opacity;
|
||
|
|
frame.firstChild.style.filter = "alpha(opacity="+Math.floor(100*jax.hover.opacity)+")";
|
||
|
|
if (button) {
|
||
|
|
button.firstChild.style.opacity = jax.hover.opacity;
|
||
|
|
button.firstChild.style.filter = frame.style.filter;
|
||
|
|
}
|
||
|
|
if (jax.hover.opacity === 1) {return}
|
||
|
|
if (jax.hover.opacity > 0) {this.HoverFadeTimer(jax,jax.hover.inc); return}
|
||
|
|
frame.parentNode.removeChild(frame);
|
||
|
|
if (button) {button.parentNode.removeChild(button)}
|
||
|
|
if (jax.hover.remove) {clearTimeout(jax.hover.remove)}
|
||
|
|
delete jax.hover;
|
||
|
|
},
|
||
|
|
//
|
||
|
|
// Set the fade to in or out (via inc) and start the timer, if needed
|
||
|
|
//
|
||
|
|
HoverFadeTimer: function (jax,inc,delay) {
|
||
|
|
jax.hover.inc = inc;
|
||
|
|
if (!jax.hover.timer) {
|
||
|
|
jax.hover.timer = setTimeout(CALLBACK(["HoverFade",this,jax]),(delay||CONFIG.fadeDelay));
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
//
|
||
|
|
// Handle a click on the menu button
|
||
|
|
//
|
||
|
|
HoverMenu: function (event) {
|
||
|
|
if (!event) {event = window.event}
|
||
|
|
return OUTPUT[this.jax].ContextMenu(event,this.math,true);
|
||
|
|
},
|
||
|
|
|
||
|
|
//
|
||
|
|
// Clear all hover timers
|
||
|
|
//
|
||
|
|
ClearHover: function (jax) {
|
||
|
|
if (jax.hover.remove) {clearTimeout(jax.hover.remove)}
|
||
|
|
if (jax.hover.timer) {clearTimeout(jax.hover.timer)}
|
||
|
|
HOVER.ClearHoverTimer();
|
||
|
|
delete jax.hover;
|
||
|
|
},
|
||
|
|
|
||
|
|
//
|
||
|
|
// Make a measurement in pixels
|
||
|
|
//
|
||
|
|
Px: function (m) {
|
||
|
|
if (Math.abs(m) < .006) {return "0px"}
|
||
|
|
return m.toFixed(2).replace(/\.?0+$/,"") + "px";
|
||
|
|
},
|
||
|
|
|
||
|
|
//
|
||
|
|
// Preload images so they show up with the menu
|
||
|
|
//
|
||
|
|
getImages: function () {
|
||
|
|
var menu = new Image();
|
||
|
|
menu.src = CONFIG.button.src;
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
//
|
||
|
|
// Handle touch events.
|
||
|
|
//
|
||
|
|
// Use double-tap-and-hold as a replacement for context menu event.
|
||
|
|
// Use double-tap as a replacement for double click.
|
||
|
|
//
|
||
|
|
var TOUCH = ME.Touch = {
|
||
|
|
|
||
|
|
last: 0, // time of last tap event
|
||
|
|
delay: 500, // delay time for double-click
|
||
|
|
|
||
|
|
//
|
||
|
|
// Check if this is a double-tap, and if so, start the timer
|
||
|
|
// for the double-tap and hold (to trigger the contextual menu)
|
||
|
|
//
|
||
|
|
start: function (event) {
|
||
|
|
var now = new Date().getTime();
|
||
|
|
var dblTap = (now - TOUCH.last < TOUCH.delay && TOUCH.up);
|
||
|
|
TOUCH.last = now; TOUCH.up = false;
|
||
|
|
if (dblTap) {
|
||
|
|
TOUCH.timeout = setTimeout(TOUCH.menu,TOUCH.delay,event,this);
|
||
|
|
event.preventDefault();
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
//
|
||
|
|
// Check if there is a timeout pending, i.e., we have a
|
||
|
|
// double-tap and were waiting to see if it is held long
|
||
|
|
// enough for the menu. Since we got the end before the
|
||
|
|
// timeout, it is a double-click, not a double-tap-and-hold.
|
||
|
|
// Prevent the default action and issue a double click.
|
||
|
|
//
|
||
|
|
end: function (event) {
|
||
|
|
var now = new Date().getTime();
|
||
|
|
TOUCH.up = (now - TOUCH.last < TOUCH.delay);
|
||
|
|
if (TOUCH.timeout) {
|
||
|
|
clearTimeout(TOUCH.timeout);
|
||
|
|
delete TOUCH.timeout; TOUCH.last = 0; TOUCH.up = false;
|
||
|
|
event.preventDefault();
|
||
|
|
return EVENT.Handler((event.touches[0]||event.touch),"DblClick",this);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
//
|
||
|
|
// If the timeout passes without an end event, we issue
|
||
|
|
// the contextual menu event.
|
||
|
|
//
|
||
|
|
menu: function (event,math) {
|
||
|
|
delete TOUCH.timeout; TOUCH.last = 0; TOUCH.up = false;
|
||
|
|
return EVENT.Handler((event.touches[0]||event.touch),"ContextMenu",math);
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
//
|
||
|
|
// Mobile screens are small, so use larger version of arrow
|
||
|
|
//
|
||
|
|
if (HUB.Browser.isMobile) {
|
||
|
|
var arrow = CONFIG.styles[".MathJax_Hover_Arrow"];
|
||
|
|
arrow.width = "25px"; arrow.height = "18px";
|
||
|
|
CONFIG.button.x = -6;
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// Set up browser-specific values
|
||
|
|
//
|
||
|
|
HUB.Browser.Select({
|
||
|
|
MSIE: function (browser) {
|
||
|
|
var mode = (document.documentMode || 0);
|
||
|
|
var isIE8 = browser.versionAtLeast("8.0");
|
||
|
|
ME.msieBorderWidthBug = (document.compatMode === "BackCompat"); // borders are inside offsetWidth/Height
|
||
|
|
ME.msieEventBug = browser.isIE9; // must get event from window even though event is passed
|
||
|
|
ME.msieAlignBug = (!isIE8 || mode < 8); // inline-block spans don't rest on baseline
|
||
|
|
if (mode < 9) {EVENT.LEFTBUTTON = 1} // IE < 9 has wrong event.button values
|
||
|
|
},
|
||
|
|
Safari: function (browser) {
|
||
|
|
ME.safariContextMenuBug = true; // selection can be started by contextmenu event
|
||
|
|
},
|
||
|
|
Opera: function (browser) {
|
||
|
|
ME.operaPositionBug = true; // position is wrong unless border is used
|
||
|
|
},
|
||
|
|
Konqueror: function (browser) {
|
||
|
|
ME.noContextMenuBug = true; // doesn't produce contextmenu event
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
//
|
||
|
|
// Used in measuring zoom and hover positions
|
||
|
|
//
|
||
|
|
ME.topImg = (ME.msieAlignBug ?
|
||
|
|
HTML.Element("img",{style:{width:0,height:0,position:"relative"},src:"about:blank"}) :
|
||
|
|
HTML.Element("span",{style:{width:0,height:0,display:"inline-block"}})
|
||
|
|
);
|
||
|
|
if (ME.operaPositionBug) {ME.topImg.style.border="1px solid"}
|
||
|
|
|
||
|
|
//
|
||
|
|
// Get configuration from user
|
||
|
|
//
|
||
|
|
ME.config = CONFIG = HUB.CombineConfig("MathEvents",CONFIG);
|
||
|
|
var SETFRAME = function () {
|
||
|
|
var haze = CONFIG.styles[".MathJax_Hover_Frame"];
|
||
|
|
haze.border = CONFIG.frame.bwidth+"px solid "+CONFIG.frame.bcolor+" ! important";
|
||
|
|
haze["box-shadow"] = haze["-webkit-box-shadow"] =
|
||
|
|
haze["-moz-box-shadow"] = haze["-khtml-box-shadow"] =
|
||
|
|
"0px 0px "+CONFIG.frame.hwidth+" "+CONFIG.frame.hcolor;
|
||
|
|
};
|
||
|
|
|
||
|
|
//
|
||
|
|
// Queue the events needed for startup
|
||
|
|
//
|
||
|
|
CALLBACK.Queue(
|
||
|
|
HUB.Register.StartupHook("End Config",{}), // wait until config is complete
|
||
|
|
[SETFRAME],
|
||
|
|
["getImages",HOVER],
|
||
|
|
["Styles",AJAX,CONFIG.styles],
|
||
|
|
["Post",HUB.Startup.signal,"MathEvents Ready"],
|
||
|
|
["loadComplete",AJAX,"[MathJax]/extensions/MathEvents.js"]
|
||
|
|
);
|
||
|
|
|
||
|
|
})(MathJax.Hub,MathJax.HTML,MathJax.Ajax,MathJax.Callback,
|
||
|
|
MathJax.Localization,MathJax.OutputJax,MathJax.InputJax);
|