| 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 | 2 | /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */ /* vim: set ts=2 et sw=2 tw=80: */ /************************************************************* * * MathJax/extensions/MathZoom.js * * Implements the zoom feature for enlarging math expressions. It is * loaded automatically when the Zoom menu selection changes from "None". * * --------------------------------------------------------------------- * * Copyright (c) 2010-2016 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,AJAX,HTMLCSS,nMML) { var VERSION = "2.7.0"; var CONFIG = HUB.CombineConfig("MathZoom",{ styles: { // // The styles for the MathZoom display box // "#MathJax_Zoom": { position:"absolute", "background-color":"#F0F0F0", overflow:"auto", display:"block", "z-index":301, padding:".5em", border:"1px solid black", margin:0, "font-weight":"normal", "font-style":"normal", "text-align":"left", "text-indent":0, "text-transform":"none", "line-height":"normal", "letter-spacing":"normal", "word-spacing":"normal", "word-wrap":"normal", "white-space":"nowrap", "float":"none", "-webkit-box-sizing":"content-box", // Android ≤ 2.3, iOS ≤ 4 "-moz-box-sizing":"content-box", // Firefox ≤ 28 "box-sizing":"content-box", // Chrome, Firefox 29+, IE 8+, Opera, Safari 5.1 "box-shadow":"5px 5px 15px #AAAAAA", // Opera 10.5 and IE9 "-webkit-box-shadow":"5px 5px 15px #AAAAAA", // Safari 3 and Chrome "-moz-box-shadow":"5px 5px 15px #AAAAAA", // Forefox 3.5 "-khtml-box-shadow":"5px 5px 15px #AAAAAA", // Konqueror filter: "progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')" // IE }, // // The styles for the hidden overlay (should not need to be adjusted by the page author) // "#MathJax_ZoomOverlay": { position:"absolute", left:0, top:0, "z-index":300, display:"inline-block", width:"100%", height:"100%", border:0, padding:0, margin:0, "background-color":"white", opacity:0, filter:"alpha(opacity=0)" }, "#MathJax_ZoomFrame": { position:"relative", display:"inline-block", height:0, width:0 }, "#MathJax_ZoomEventTrap": { position:"absolute", left:0, top:0, "z-index":302, display:"inline-block", border:0, padding:0, margin:0, "background-color":"white", opacity:0, filter:"alpha(opacity=0)" } } }); var FALSE, HOVER, EVENT; MathJax.Hub.Register.StartupHook("MathEvents Ready",function () { EVENT = MathJax.Extension.MathEvents.Event; FALSE = MathJax.Extension.MathEvents.Event.False; HOVER = MathJax.Extension.MathEvents.Hover; }); /*************************************************************/ var ZOOM = MathJax.Extension.MathZoom = { version: VERSION, settings: HUB.config.menuSettings, scrollSize: 18, // width of scrool bars // // Process events passed from output jax // HandleEvent: function (event,type,math) { if (ZOOM.settings.CTRL && !event.ctrlKey) return true; if (ZOOM.settings.ALT && !event.altKey) return true; if (ZOOM.settings.CMD && !event.metaKey) return true; if (ZOOM.settings.Shift && !event.shiftKey) return true; if (!ZOOM[type]) return true; return ZOOM[type](event,math); }, // // Zoom on click // Click: function (event,math) { if (this.settings.zoom === "Click") {return this.Zoom(event,math)} }, // // Zoom on double click // DblClick: function (event,math) { if (this.settings.zoom === "Double-Click" || this.settings.zoom === "DoubleClick") {return this.Zoom(event,math)} }, // // Zoom on hover (called by MathEvents.Hover) // Hover: function (event,math) { if (this.settings.zoom === "Hover") {this.Zoom(event,math); return true} return false; }, // // Handle the actual zooming // Zoom: function (event,math) { // // Remove any other zoom and clear timers // this.Remove(); HOVER.ClearHoverTimer(); EVENT.ClearSelection(); // // Find the jax // var JAX = MathJax.OutputJax[math.jaxID]; var jax = JAX.getJaxFromMath(math); if (jax.hover) {HOVER.UnHover(jax)} // // Create the DOM elements for the zoom box // var container = this.findContainer(math); var Mw = Math.floor(.85*container.clientWidth), Mh = Math.max(document.body.clientHeight,document.documentElement.clientHeight); if (this.getOverflow(container) !== "visible") {Mh = Math.min(container.clientHeight,Mh)} Mh = Math.floor(.85*Mh); var div = HTML.Element( "span",{id:"MathJax_ZoomFrame"},[ ["span",{id:"MathJax_ZoomOverlay", onmousedown:this.Remove}], ["span",{ id:"MathJax_Zoom", onclick:this.Remove, style:{visibility:"hidden", fontSize:this.settings.zscale} },[["span",{style:{display:"inline-block", "white-space":"nowrap"}}]] ]] ); var zoom = div.lastChild, span = zoom.firstChild, overlay = div.firstChild; math.parentNode.insertBefore(div,math); math.parentNode.insertBefore(math,div); // put div after math if (span.addEventListener) {span.addEventListener("mousedown",this.Remove,true)} var eW = zoom.offsetWidth || zoom.clientWidth; Mw -= eW; Mh -= eW; zoom.style.maxWidth = Mw+"px"; zoom.style.maxHeight = Mh+"px"; if (this.msieTrapEventBug) { var trap = HTML.Element("span",{id:"MathJax_ZoomEventTrap", onmousedown:this.Remove}); div.insertBefore(trap,zoom); } // // Display the zoomed math // if (this.msieZIndexBug) { // MSIE doesn't do z-index properly, so move the div to the document.body, // and use an image as a tracker for the usual position var tracker = HTML.addElement(document.body,"img",{ src:"about:blank", id:"MathJax_ZoomTracker", width:0, height:0, style:{width:0, height:0, position:"relative"} }); div.style.position = "relative"; div.style.zIndex = CONFIG.styles["#MathJax_ZoomOverlay"]["z-index"]; div = tracker; } var bbox = JAX.Zoom(jax,span,math,Mw,Mh); // // Fix up size and position for browsers with bugs (IE) // if (this.msiePositionBug) { if (this.msieSizeBug) {zoom.style.height = bbox.zH+"px"; zoom.style.width = bbox.zW+"px"} // IE8 gets the dimensions completely wrong if (zoom.offsetHeight > Mh) {zoom.style.height = Mh+"px"; zoom.style.width = (bbox.zW+this.scrollSize)+"px"} // IE doesn't do max-height? if (zoom.offsetWidth > Mw) {zoom.style.width = Mw+"px"; zoom.style.height = (bbox.zH+this.scrollSize)+"px"} } if (this.operaPositionBug) {zoom.style.width = Math.min(Mw,bbox.zW)+"px"} // Opera gets width as 0? if (zoom.offsetWidth > eW && zoom.offsetWidth-eW < Mw && zoom.offsetHeight-eW < Mh) {zoom.style.overflow = "visible"} // don't show scroll bars if we don't need to this.Position(zoom,bbox); if (this.msieTrapEventBug) { trap.style.height = zoom.clientHeight+"px"; trap.style.width = zoom.clientWidth+"px"; trap.style.left = (parseFloat(zoom.style.left)+zoom.clientLeft)+"px"; trap.style.top = (parseFloat(zoom.style.top)+zoom.clientTop)+"px"; } zoom.style.visibility = ""; // // Add event handlers // if (this.settings.zoom === "Hover") {overlay.onmouseover = this.Remove} if (window.addEventListener) {addEventListener("resize",this.Resize,false)} else if (window.attachEvent) {attachEvent("onresize",this.Resize)} else {this.onresize = window.onresize; window.onresize = this.Resize} // // Let others know about the zoomed math // HUB.signal.Post(["math zoomed",jax]); // // Canel further actions // return FALSE(event); }, // // Set the position of the zoom box and overlay // Position: function (zoom,bbox) { zoom.style.display = "none"; // avoids getting excessive width in Resize() var XY = this.Resize(), x = XY.x, y = XY.y, W = bbox.mW; zoom.style.display = ""; var dx = -W-Math.floor((zoom.offsetWidth-W)/2), dy = bbox.Y; zoom.style.left = Math.max(dx,10-x)+"px"; zoom.style.top = Math.max(dy,10-y)+"px"; if (!ZOOM.msiePositionBug) {ZOOM.SetWH()} // refigure overlay width/height }, // // Handle resizing of overlay while zoom is displayed // Resize: function (event) { if (ZOOM.onresize) {ZOOM.onresize(event)} var div = document.getElementById("MathJax_ZoomFrame"), overlay = document.getElementById("MathJax_ZoomOverlay"); var xy = ZOOM.getXY(div), obj = ZOOM.findContainer(div); if (ZOOM.getOverflow(obj) !== "visible") { overlay.scroll_parent = obj; // Save this for future reference. var XY = ZOOM.getXY(obj); // Remove container position xy.x -= XY.x; xy.y -= XY.y; XY = ZOOM.getBorder(obj); // Remove container border xy.x -= XY.x; xy.y -= XY.y; } overlay.style.left = (-xy.x)+"px"; overlay.style.top = (-xy.y)+"px"; if (ZOOM.msiePositionBug) {setTimeout(ZOOM.SetWH,0)} else {ZOOM.SetWH()} return xy; }, SetWH: function () { var overlay = document.getElementById("MathJax_ZoomOverlay"); if (!overlay) return; overlay.style.display = "none"; // so scrollWidth/Height will be right below var doc = overlay.scroll_parent || document.documentElement || document.body; overlay.style.width = doc.scrollWidth + "px"; overlay.style.height = Math.max(doc.clientHeight,doc.scrollHeight) + "px"; overlay.style.display = ""; }, findContainer: function (obj) { obj = obj.parentNode; while (obj.parentNode && obj !== document.body && ZOOM.getOverflow(obj) === "visible") {obj = obj.parentNode} return obj; }, // // Look up CSS properties (use getComputeStyle if available, or currentStyle if not) // getOverflow: (window.getComputedStyle ? function (obj) {return getComputedStyle(obj).overflow} : function (obj) {return (obj.currentStyle||{overflow:"visible"}).overflow}), getBorder: function (obj) { var size = {thin: 1, medium: 2, thick: 3}; var style = (window.getComputedStyle ? getComputedStyle(obj) : (obj.currentStyle || {borderLeftWidth:0,borderTopWidth:0})); var x = style.borderLeftWidth, y = style.borderTopWidth; if (size[x]) {x = size[x]} else {x = parseInt(x)} if (size[y]) {y = size[y]} else {y = parseInt(y)} return {x:x, y:y}; }, // // Get the position of an element on the page // getXY: function (div) { var x = 0, y = 0, obj; obj = div; while (obj.offsetParent) {x += obj.offsetLeft; obj = obj.offsetParent} if (ZOOM.operaPositionBug) {div.style.border = "1px solid"} // to get vertical position right obj = div; while (obj.offsetParent) {y += obj.offsetTop; obj = obj.offsetParent} if (ZOOM.operaPositionBug) {div.style.border = ""} return {x:x, y:y}; }, // // Remove zoom display and event handlers // Remove: function (event) { var div = document.getElementById("MathJax_ZoomFrame"); if (div) { var JAX = MathJax.OutputJax[div.previousSibling.jaxID]; var jax = JAX.getJaxFromMath(div.previousSibling); HUB.signal.Post(["math unzoomed",jax]); div.parentNode.removeChild(div); div = document.getElementById("MathJax_ZoomTracker"); if (div) {div.parentNode.removeChild(div)} if (ZOOM.operaRefreshBug) { // force a redisplay of the page // (Opera doesn't refresh properly after the zoom is removed) var overlay = HTML.addElement(document.body,"div",{ style:{position:"fixed", left:0, top:0, width:"100%", height:"100%", backgroundColor:"white", opacity:0}, id: "MathJax_OperaDiv" }); document.body.removeChild(overlay); } if (window.removeEventListener) {removeEventListener("resize",ZOOM.Resize,false)} else if (window.detachEvent) {detachEvent("onresize",ZOOM.Resize)} else {window.onresize = ZOOM.onresize; delete ZOOM.onresize} } return FALSE(event); } }; /*************************************************************/ HUB.Browser.Select({ MSIE: function (browser) { var mode = (document.documentMode || 0); var isIE9 = (mode >= 9); ZOOM.msiePositionBug = !isIE9; ZOOM.msieSizeBug = browser.versionAtLeast("7.0") && (!document.documentMode || mode === 7 || mode === 8); ZOOM.msieZIndexBug = (mode <= 7); ZOOM.msieInlineBlockAlignBug = (mode <= 7); ZOOM.msieTrapEventBug = !window.addEventListener; if (document.compatMode === "BackCompat") {ZOOM.scrollSize = 52} // don't know why this is so far off if (isIE9) {delete CONFIG.styles["#MathJax_Zoom"].filter} }, Opera: function (browser) { ZOOM.operaPositionBug = true; ZOOM.operaRefreshBug = true; } }); ZOOM.topImg = (ZOOM.msieInlineBlockAlignBug ? 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 (ZOOM.operaPositionBug || ZOOM.msieTopBug) {ZOOM.topImg.style.border="1px solid"} /*************************************************************/ MathJax.Callback.Queue( ["StartupHook",MathJax.Hub.Register,"Begin Styles",{}], ["Styles",AJAX,CONFIG.styles], ["Post",HUB.Startup.signal,"MathZoom Ready"], ["loadComplete",AJAX,"[MathJax]/extensions/MathZoom.js"] ); })(MathJax.Hub,MathJax.HTML,MathJax.Ajax,MathJax.OutputJax["HTML-CSS"],MathJax.OutputJax.NativeMML); |