| 1 |
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| 2 |
/* Copyright 2012 Mozilla Foundation |
| 3 |
* |
| 4 |
* Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 |
* you may not use this file except in compliance with the License. |
| 6 |
* You may obtain a copy of the License at |
| 7 |
* |
| 8 |
* http://www.apache.org/licenses/LICENSE-2.0 |
| 9 |
* |
| 10 |
* Unless required by applicable law or agreed to in writing, software |
| 11 |
* distributed under the License is distributed on an "AS IS" BASIS, |
| 12 |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 |
* See the License for the specific language governing permissions and |
| 14 |
* limitations under the License. |
| 15 |
*/ |
| 16 |
|
| 17 |
'use strict'; |
| 18 |
|
| 19 |
var CSS_UNITS = 96.0 / 72.0; |
| 20 |
var DEFAULT_SCALE = 'auto'; |
| 21 |
var UNKNOWN_SCALE = 0; |
| 22 |
var MAX_AUTO_SCALE = 1.25; |
| 23 |
var SCROLLBAR_PADDING = 40; |
| 24 |
var VERTICAL_PADDING = 5; |
| 25 |
|
| 26 |
// optimised CSS custom property getter/setter |
| 27 |
var CustomStyle = (function CustomStyleClosure() { |
| 28 |
|
| 29 |
// As noted on: http://www.zachstronaut.com/posts/2009/02/17/ |
| 30 |
// animate-css-transforms-firefox-webkit.html |
| 31 |
// in some versions of IE9 it is critical that ms appear in this list |
| 32 |
// before Moz |
| 33 |
var prefixes = ['ms', 'Moz', 'Webkit', 'O']; |
| 34 |
var _cache = {}; |
| 35 |
|
| 36 |
function CustomStyle() {} |
| 37 |
|
| 38 |
CustomStyle.getProp = function get(propName, element) { |
| 39 |
// check cache only when no element is given |
| 40 |
if (arguments.length === 1 && typeof _cache[propName] === 'string') { |
| 41 |
return _cache[propName]; |
| 42 |
} |
| 43 |
|
| 44 |
element = element || document.documentElement; |
| 45 |
var style = element.style, prefixed, uPropName; |
| 46 |
|
| 47 |
// test standard property first |
| 48 |
if (typeof style[propName] === 'string') { |
| 49 |
return (_cache[propName] = propName); |
| 50 |
} |
| 51 |
|
| 52 |
// capitalize |
| 53 |
uPropName = propName.charAt(0).toUpperCase() + propName.slice(1); |
| 54 |
|
| 55 |
// test vendor specific properties |
| 56 |
for (var i = 0, l = prefixes.length; i < l; i++) { |
| 57 |
prefixed = prefixes[i] + uPropName; |
| 58 |
if (typeof style[prefixed] === 'string') { |
| 59 |
return (_cache[propName] = prefixed); |
| 60 |
} |
| 61 |
} |
| 62 |
|
| 63 |
//if all fails then set to undefined |
| 64 |
return (_cache[propName] = 'undefined'); |
| 65 |
}; |
| 66 |
|
| 67 |
CustomStyle.setProp = function set(propName, element, str) { |
| 68 |
var prop = this.getProp(propName); |
| 69 |
if (prop !== 'undefined') { |
| 70 |
element.style[prop] = str; |
| 71 |
} |
| 72 |
}; |
| 73 |
|
| 74 |
return CustomStyle; |
| 75 |
})(); |
| 76 |
|
| 77 |
function getFileName(url) { |
| 78 |
var anchor = url.indexOf('#'); |
| 79 |
var query = url.indexOf('?'); |
| 80 |
var end = Math.min( |
| 81 |
anchor > 0 ? anchor : url.length, |
| 82 |
query > 0 ? query : url.length); |
| 83 |
return url.substring(url.lastIndexOf('/', end) + 1, end); |
| 84 |
} |
| 85 |
|
| 86 |
/** |
| 87 |
* Returns scale factor for the canvas. It makes sense for the HiDPI displays. |
| 88 |
* @return {Object} The object with horizontal (sx) and vertical (sy) |
| 89 |
scales. The scaled property is set to false if scaling is |
| 90 |
not required, true otherwise. |
| 91 |
*/ |
| 92 |
function getOutputScale(ctx) { |
| 93 |
var devicePixelRatio = window.devicePixelRatio || 1; |
| 94 |
var backingStoreRatio = ctx.webkitBackingStorePixelRatio || |
| 95 |
ctx.mozBackingStorePixelRatio || |
| 96 |
ctx.msBackingStorePixelRatio || |
| 97 |
ctx.oBackingStorePixelRatio || |
| 98 |
ctx.backingStorePixelRatio || 1; |
| 99 |
var pixelRatio = devicePixelRatio / backingStoreRatio; |
| 100 |
return { |
| 101 |
sx: pixelRatio, |
| 102 |
sy: pixelRatio, |
| 103 |
scaled: pixelRatio !== 1 |
| 104 |
}; |
| 105 |
} |
| 106 |
|
| 107 |
/** |
| 108 |
* Scrolls specified element into view of its parent. |
| 109 |
* element {Object} The element to be visible. |
| 110 |
* spot {Object} An object with optional top and left properties, |
| 111 |
* specifying the offset from the top left edge. |
| 112 |
*/ |
| 113 |
function scrollIntoView(element, spot) { |
| 114 |
// Assuming offsetParent is available (it's not available when viewer is in |
| 115 |
// hidden iframe or object). We have to scroll: if the offsetParent is not set |
| 116 |
// producing the error. See also animationStartedClosure. |
| 117 |
var parent = element.offsetParent; |
| 118 |
var offsetY = element.offsetTop + element.clientTop; |
| 119 |
var offsetX = element.offsetLeft + element.clientLeft; |
| 120 |
if (!parent) { |
| 121 |
console.error('offsetParent is not set -- cannot scroll'); |
| 122 |
return; |
| 123 |
} |
| 124 |
while (parent.clientHeight === parent.scrollHeight) { |
| 125 |
if (parent.dataset._scaleY) { |
| 126 |
offsetY /= parent.dataset._scaleY; |
| 127 |
offsetX /= parent.dataset._scaleX; |
| 128 |
} |
| 129 |
offsetY += parent.offsetTop; |
| 130 |
offsetX += parent.offsetLeft; |
| 131 |
parent = parent.offsetParent; |
| 132 |
if (!parent) { |
| 133 |
return; // no need to scroll |
| 134 |
} |
| 135 |
} |
| 136 |
if (spot) { |
| 137 |
if (spot.top !== undefined) { |
| 138 |
offsetY += spot.top; |
| 139 |
} |
| 140 |
if (spot.left !== undefined) { |
| 141 |
offsetX += spot.left; |
| 142 |
parent.scrollLeft = offsetX; |
| 143 |
} |
| 144 |
} |
| 145 |
parent.scrollTop = offsetY; |
| 146 |
} |
| 147 |
|
| 148 |
/** |
| 149 |
* Helper function to start monitoring the scroll event and converting them into |
| 150 |
* PDF.js friendly one: with scroll debounce and scroll direction. |
| 151 |
*/ |
| 152 |
function watchScroll(viewAreaElement, callback) { |
| 153 |
var debounceScroll = function debounceScroll(evt) { |
| 154 |
if (rAF) { |
| 155 |
return; |
| 156 |
} |
| 157 |
// schedule an invocation of scroll for next animation frame. |
| 158 |
rAF = window.requestAnimationFrame(function viewAreaElementScrolled() { |
| 159 |
rAF = null; |
| 160 |
|
| 161 |
var currentY = viewAreaElement.scrollTop; |
| 162 |
var lastY = state.lastY; |
| 163 |
if (currentY !== lastY) { |
| 164 |
state.down = currentY > lastY; |
| 165 |
} |
| 166 |
state.lastY = currentY; |
| 167 |
callback(state); |
| 168 |
}); |
| 169 |
}; |
| 170 |
|
| 171 |
var state = { |
| 172 |
down: true, |
| 173 |
lastY: viewAreaElement.scrollTop, |
| 174 |
_eventHandler: debounceScroll |
| 175 |
}; |
| 176 |
|
| 177 |
var rAF = null; |
| 178 |
viewAreaElement.addEventListener('scroll', debounceScroll, true); |
| 179 |
return state; |
| 180 |
} |
| 181 |
|
| 182 |
/** |
| 183 |
* Use binary search to find the index of the first item in a given array which |
| 184 |
* passes a given condition. The items are expected to be sorted in the sense |
| 185 |
* that if the condition is true for one item in the array, then it is also true |
| 186 |
* for all following items. |
| 187 |
* |
| 188 |
* @returns {Number} Index of the first array element to pass the test, |
| 189 |
* or |items.length| if no such element exists. |
| 190 |
*/ |
| 191 |
function binarySearchFirstItem(items, condition) { |
| 192 |
var minIndex = 0; |
| 193 |
var maxIndex = items.length - 1; |
| 194 |
|
| 195 |
if (items.length === 0 || !condition(items[maxIndex])) { |
| 196 |
return items.length; |
| 197 |
} |
| 198 |
if (condition(items[minIndex])) { |
| 199 |
return minIndex; |
| 200 |
} |
| 201 |
|
| 202 |
while (minIndex < maxIndex) { |
| 203 |
var currentIndex = (minIndex + maxIndex) >> 1; |
| 204 |
var currentItem = items[currentIndex]; |
| 205 |
if (condition(currentItem)) { |
| 206 |
maxIndex = currentIndex; |
| 207 |
} else { |
| 208 |
minIndex = currentIndex + 1; |
| 209 |
} |
| 210 |
} |
| 211 |
return minIndex; /* === maxIndex */ |
| 212 |
} |
| 213 |
|
| 214 |
/** |
| 215 |
* Generic helper to find out what elements are visible within a scroll pane. |
| 216 |
*/ |
| 217 |
function getVisibleElements(scrollEl, views, sortByVisibility) { |
| 218 |
var top = scrollEl.scrollTop, bottom = top + scrollEl.clientHeight; |
| 219 |
var left = scrollEl.scrollLeft, right = left + scrollEl.clientWidth; |
| 220 |
|
| 221 |
function isElementBottomBelowViewTop(view) { |
| 222 |
var element = view.div; |
| 223 |
var elementBottom = |
| 224 |
element.offsetTop + element.clientTop + element.clientHeight; |
| 225 |
return elementBottom > top; |
| 226 |
} |
| 227 |
|
| 228 |
var visible = [], view, element; |
| 229 |
var currentHeight, viewHeight, hiddenHeight, percentHeight; |
| 230 |
var currentWidth, viewWidth; |
| 231 |
var firstVisibleElementInd = (views.length === 0) ? 0 : |
| 232 |
binarySearchFirstItem(views, isElementBottomBelowViewTop); |
| 233 |
|
| 234 |
for (var i = firstVisibleElementInd, ii = views.length; i < ii; i++) { |
| 235 |
view = views[i]; |
| 236 |
element = view.div; |
| 237 |
currentHeight = element.offsetTop + element.clientTop; |
| 238 |
viewHeight = element.clientHeight; |
| 239 |
|
| 240 |
if (currentHeight > bottom) { |
| 241 |
break; |
| 242 |
} |
| 243 |
|
| 244 |
currentWidth = element.offsetLeft + element.clientLeft; |
| 245 |
viewWidth = element.clientWidth; |
| 246 |
if (currentWidth + viewWidth < left || currentWidth > right) { |
| 247 |
continue; |
| 248 |
} |
| 249 |
hiddenHeight = Math.max(0, top - currentHeight) + |
| 250 |
Math.max(0, currentHeight + viewHeight - bottom); |
| 251 |
percentHeight = ((viewHeight - hiddenHeight) * 100 / viewHeight) | 0; |
| 252 |
|
| 253 |
visible.push({ |
| 254 |
id: view.id, |
| 255 |
x: currentWidth, |
| 256 |
y: currentHeight, |
| 257 |
view: view, |
| 258 |
percent: percentHeight |
| 259 |
}); |
| 260 |
} |
| 261 |
|
| 262 |
var first = visible[0]; |
| 263 |
var last = visible[visible.length - 1]; |
| 264 |
|
| 265 |
if (sortByVisibility) { |
| 266 |
visible.sort(function(a, b) { |
| 267 |
var pc = a.percent - b.percent; |
| 268 |
if (Math.abs(pc) > 0.001) { |
| 269 |
return -pc; |
| 270 |
} |
| 271 |
return a.id - b.id; // ensure stability |
| 272 |
}); |
| 273 |
} |
| 274 |
return {first: first, last: last, views: visible}; |
| 275 |
} |
| 276 |
|
| 277 |
/** |
| 278 |
* Event handler to suppress context menu. |
| 279 |
*/ |
| 280 |
function noContextMenuHandler(e) { |
| 281 |
e.preventDefault(); |
| 282 |
} |
| 283 |
|
| 284 |
/** |
| 285 |
* Returns the filename or guessed filename from the url (see issue 3455). |
| 286 |
* url {String} The original PDF location. |
| 287 |
* @return {String} Guessed PDF file name. |
| 288 |
*/ |
| 289 |
function getPDFFileNameFromURL(url) { |
| 290 |
var reURI = /^(?:([^:]+:)?\/\/[^\/]+)?([^?#]*)(\?[^#]*)?(#.*)?$/; |
| 291 |
// SCHEME HOST 1.PATH 2.QUERY 3.REF |
| 292 |
// Pattern to get last matching NAME.pdf |
| 293 |
var reFilename = /[^\/?#=]+\.pdf\b(?!.*\.pdf\b)/i; |
| 294 |
var splitURI = reURI.exec(url); |
| 295 |
var suggestedFilename = reFilename.exec(splitURI[1]) || |
| 296 |
reFilename.exec(splitURI[2]) || |
| 297 |
reFilename.exec(splitURI[3]); |
| 298 |
if (suggestedFilename) { |
| 299 |
suggestedFilename = suggestedFilename[0]; |
| 300 |
if (suggestedFilename.indexOf('%') !== -1) { |
| 301 |
// URL-encoded %2Fpath%2Fto%2Ffile.pdf should be file.pdf |
| 302 |
try { |
| 303 |
suggestedFilename = |
| 304 |
reFilename.exec(decodeURIComponent(suggestedFilename))[0]; |
| 305 |
} catch(e) { // Possible (extremely rare) errors: |
| 306 |
// URIError "Malformed URI", e.g. for "%AA.pdf" |
| 307 |
// TypeError "null has no properties", e.g. for "%2F.pdf" |
| 308 |
} |
| 309 |
} |
| 310 |
} |
| 311 |
return suggestedFilename || 'document.pdf'; |
| 312 |
} |
| 313 |
|
| 314 |
var ProgressBar = (function ProgressBarClosure() { |
| 315 |
|
| 316 |
function clamp(v, min, max) { |
| 317 |
return Math.min(Math.max(v, min), max); |
| 318 |
} |
| 319 |
|
| 320 |
function ProgressBar(id, opts) { |
| 321 |
this.visible = true; |
| 322 |
|
| 323 |
// Fetch the sub-elements for later. |
| 324 |
this.div = document.querySelector(id + ' .progress'); |
| 325 |
|
| 326 |
// Get the loading bar element, so it can be resized to fit the viewer. |
| 327 |
this.bar = this.div.parentNode; |
| 328 |
|
| 329 |
// Get options, with sensible defaults. |
| 330 |
this.height = opts.height || 100; |
| 331 |
this.width = opts.width || 100; |
| 332 |
this.units = opts.units || '%'; |
| 333 |
|
| 334 |
// Initialize heights. |
| 335 |
this.div.style.height = this.height + this.units; |
| 336 |
this.percent = 0; |
| 337 |
} |
| 338 |
|
| 339 |
ProgressBar.prototype = { |
| 340 |
|
| 341 |
updateBar: function ProgressBar_updateBar() { |
| 342 |
if (this._indeterminate) { |
| 343 |
this.div.classList.add('indeterminate'); |
| 344 |
this.div.style.width = this.width + this.units; |
| 345 |
return; |
| 346 |
} |
| 347 |
|
| 348 |
this.div.classList.remove('indeterminate'); |
| 349 |
var progressSize = this.width * this._percent / 100; |
| 350 |
this.div.style.width = progressSize + this.units; |
| 351 |
}, |
| 352 |
|
| 353 |
get percent() { |
| 354 |
return this._percent; |
| 355 |
}, |
| 356 |
|
| 357 |
set percent(val) { |
| 358 |
this._indeterminate = isNaN(val); |
| 359 |
this._percent = clamp(val, 0, 100); |
| 360 |
this.updateBar(); |
| 361 |
}, |
| 362 |
|
| 363 |
setWidth: function ProgressBar_setWidth(viewer) { |
| 364 |
if (viewer) { |
| 365 |
var container = viewer.parentNode; |
| 366 |
var scrollbarWidth = container.offsetWidth - viewer.offsetWidth; |
| 367 |
if (scrollbarWidth > 0) { |
| 368 |
this.bar.setAttribute('style', 'width: calc(100% - ' + |
| 369 |
scrollbarWidth + 'px);'); |
| 370 |
} |
| 371 |
} |
| 372 |
}, |
| 373 |
|
| 374 |
hide: function ProgressBar_hide() { |
| 375 |
if (!this.visible) { |
| 376 |
return; |
| 377 |
} |
| 378 |
this.visible = false; |
| 379 |
this.bar.classList.add('hidden'); |
| 380 |
document.body.classList.remove('loadingInProgress'); |
| 381 |
}, |
| 382 |
|
| 383 |
show: function ProgressBar_show() { |
| 384 |
if (this.visible) { |
| 385 |
return; |
| 386 |
} |
| 387 |
this.visible = true; |
| 388 |
document.body.classList.add('loadingInProgress'); |
| 389 |
this.bar.classList.remove('hidden'); |
| 390 |
} |
| 391 |
}; |
| 392 |
|
| 393 |
return ProgressBar; |
| 394 |
})(); |
| 395 |
|
