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| /* Copyright 2012 Mozilla Foundation
*
* 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.
*/
import { createPromiseCapability, PDFJS } from 'pdfjs-lib';
const CSS_UNITS = 96.0 / 72.0;
const DEFAULT_SCALE_VALUE = 'auto';
const DEFAULT_SCALE = 1.0;
const MIN_SCALE = 0.10;
const MAX_SCALE = 10.0;
const UNKNOWN_SCALE = 0;
const MAX_AUTO_SCALE = 1.25;
const SCROLLBAR_PADDING = 40;
const VERTICAL_PADDING = 5;
const PresentationModeState = {
UNKNOWN: 0,
NORMAL: 1,
CHANGING: 2,
FULLSCREEN: 3,
};
const RendererType = {
CANVAS: 'canvas',
SVG: 'svg',
};
// Replaces {{arguments}} with their values.
function formatL10nValue(text, args) {
if (!args) {
return text;
}
return text.replace(/\{\{\s*(\w+)\s*\}\}/g, (all, name) => {
return (name in args ? args[name] : '{{' + name + '}}');
});
}
/**
* No-op implemetation of the localization service.
* @implements {IL10n}
*/
let NullL10n = {
getDirection() {
return Promise.resolve('ltr');
},
get(property, args, fallback) {
return Promise.resolve(formatL10nValue(fallback, args));
},
translate(element) {
return Promise.resolve();
},
};
/**
* Disables fullscreen support, and by extension Presentation Mode,
* in browsers which support the fullscreen API.
* @var {boolean}
*/
PDFJS.disableFullscreen = (PDFJS.disableFullscreen === undefined ?
false : PDFJS.disableFullscreen);
/**
* Enables CSS only zooming.
* @var {boolean}
*/
PDFJS.useOnlyCssZoom = (PDFJS.useOnlyCssZoom === undefined ?
false : PDFJS.useOnlyCssZoom);
/**
* The maximum supported canvas size in total pixels e.g. width * height.
* The default value is 4096 * 4096. Use -1 for no limit.
* @var {number}
*/
PDFJS.maxCanvasPixels = (PDFJS.maxCanvasPixels === undefined ?
16777216 : PDFJS.maxCanvasPixels);
/**
* Disables saving of the last position of the viewed PDF.
* @var {boolean}
*/
PDFJS.disableHistory = (PDFJS.disableHistory === undefined ?
false : PDFJS.disableHistory);
/**
* Disables creation of the text layer that used for text selection and search.
* @var {boolean}
*/
PDFJS.disableTextLayer = (PDFJS.disableTextLayer === undefined ?
false : PDFJS.disableTextLayer);
if (typeof PDFJSDev === 'undefined' ||
!PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
/**
* Interface locale settings.
* @var {string}
*/
PDFJS.locale =
(PDFJS.locale === undefined && typeof navigator !== 'undefined' ?
navigator.language : PDFJS.locale);
}
/**
* Returns scale factor for the canvas. It makes sense for the HiDPI displays.
* @return {Object} The object with horizontal (sx) and vertical (sy)
scales. The scaled property is set to false if scaling is
not required, true otherwise.
*/
function getOutputScale(ctx) {
let devicePixelRatio = window.devicePixelRatio || 1;
let backingStoreRatio = ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio || 1;
let pixelRatio = devicePixelRatio / backingStoreRatio;
return {
sx: pixelRatio,
sy: pixelRatio,
scaled: pixelRatio !== 1,
};
}
/**
* Scrolls specified element into view of its parent.
* @param {Object} element - The element to be visible.
* @param {Object} spot - An object with optional top and left properties,
* specifying the offset from the top left edge.
* @param {boolean} skipOverflowHiddenElements - Ignore elements that have
* the CSS rule `overflow: hidden;` set. The default is false.
*/
function scrollIntoView(element, spot, skipOverflowHiddenElements = false) {
// Assuming offsetParent is available (it's not available when viewer is in
// hidden iframe or object). We have to scroll: if the offsetParent is not set
// producing the error. See also animationStarted.
let parent = element.offsetParent;
if (!parent) {
console.error('offsetParent is not set -- cannot scroll');
return;
}
let offsetY = element.offsetTop + element.clientTop;
let offsetX = element.offsetLeft + element.clientLeft;
while (parent.clientHeight === parent.scrollHeight ||
(skipOverflowHiddenElements &&
getComputedStyle(parent).overflow === 'hidden')) {
if (parent.dataset._scaleY) {
offsetY /= parent.dataset._scaleY;
offsetX /= parent.dataset._scaleX;
}
offsetY += parent.offsetTop;
offsetX += parent.offsetLeft;
parent = parent.offsetParent;
if (!parent) {
return; // no need to scroll
}
}
if (spot) {
if (spot.top !== undefined) {
offsetY += spot.top;
}
if (spot.left !== undefined) {
offsetX += spot.left;
parent.scrollLeft = offsetX;
}
}
parent.scrollTop = offsetY;
}
/**
* Helper function to start monitoring the scroll event and converting them into
* PDF.js friendly one: with scroll debounce and scroll direction.
*/
function watchScroll(viewAreaElement, callback) {
let debounceScroll = function(evt) {
if (rAF) {
return;
}
// schedule an invocation of scroll for next animation frame.
rAF = window.requestAnimationFrame(function viewAreaElementScrolled() {
rAF = null;
let currentY = viewAreaElement.scrollTop;
let lastY = state.lastY;
if (currentY !== lastY) {
state.down = currentY > lastY;
}
state.lastY = currentY;
callback(state);
});
};
let state = {
down: true,
lastY: viewAreaElement.scrollTop,
_eventHandler: debounceScroll,
};
let rAF = null;
viewAreaElement.addEventListener('scroll', debounceScroll, true);
return state;
}
/**
* Helper function to parse query string (e.g. ?param1=value&parm2=...).
*/
function parseQueryString(query) {
let parts = query.split('&');
let params = Object.create(null);
for (let i = 0, ii = parts.length; i < ii; ++i) {
let param = parts[i].split('=');
let key = param[0].toLowerCase();
let value = param.length > 1 ? param[1] : null;
params[decodeURIComponent(key)] = decodeURIComponent(value);
}
return params;
}
/**
* Use binary search to find the index of the first item in a given array which
* passes a given condition. The items are expected to be sorted in the sense
* that if the condition is true for one item in the array, then it is also true
* for all following items.
*
* @returns {Number} Index of the first array element to pass the test,
* or |items.length| if no such element exists.
*/
function binarySearchFirstItem(items, condition) {
let minIndex = 0;
let maxIndex = items.length - 1;
if (items.length === 0 || !condition(items[maxIndex])) {
return items.length;
}
if (condition(items[minIndex])) {
return minIndex;
}
while (minIndex < maxIndex) {
let currentIndex = (minIndex + maxIndex) >> 1;
let currentItem = items[currentIndex];
if (condition(currentItem)) {
maxIndex = currentIndex;
} else {
minIndex = currentIndex + 1;
}
}
return minIndex; /* === maxIndex */
}
/**
* Approximates float number as a fraction using Farey sequence (max order
* of 8).
* @param {number} x - Positive float number.
* @returns {Array} Estimated fraction: the first array item is a numerator,
* the second one is a denominator.
*/
function approximateFraction(x) {
// Fast paths for int numbers or their inversions.
if (Math.floor(x) === x) {
return [x, 1];
}
let xinv = 1 / x;
let limit = 8;
if (xinv > limit) {
return [1, limit];
} else if (Math.floor(xinv) === xinv) {
return [1, xinv];
}
let x_ = x > 1 ? xinv : x;
// a/b and c/d are neighbours in Farey sequence.
let a = 0, b = 1, c = 1, d = 1;
// Limiting search to order 8.
while (true) {
// Generating next term in sequence (order of q).
let p = a + c, q = b + d;
if (q > limit) {
break;
}
if (x_ <= p / q) {
c = p; d = q;
} else {
a = p; b = q;
}
}
let result;
// Select closest of the neighbours to x.
if (x_ - a / b < c / d - x_) {
result = x_ === x ? [a, b] : [b, a];
} else {
result = x_ === x ? [c, d] : [d, c];
}
return result;
}
function roundToDivide(x, div) {
let r = x % div;
return r === 0 ? x : Math.round(x - r + div);
}
/**
* Generic helper to find out what elements are visible within a scroll pane.
*/
function getVisibleElements(scrollEl, views, sortByVisibility = false) {
let top = scrollEl.scrollTop, bottom = top + scrollEl.clientHeight;
let left = scrollEl.scrollLeft, right = left + scrollEl.clientWidth;
function isElementBottomBelowViewTop(view) {
let element = view.div;
let elementBottom =
element.offsetTop + element.clientTop + element.clientHeight;
return elementBottom > top;
}
let visible = [], view, element;
let currentHeight, viewHeight, hiddenHeight, percentHeight;
let currentWidth, viewWidth;
let firstVisibleElementInd = views.length === 0 ? 0 :
binarySearchFirstItem(views, isElementBottomBelowViewTop);
for (let i = firstVisibleElementInd, ii = views.length; i < ii; i++) {
view = views[i];
element = view.div;
currentHeight = element.offsetTop + element.clientTop;
viewHeight = element.clientHeight;
if (currentHeight > bottom) {
break;
}
currentWidth = element.offsetLeft + element.clientLeft;
viewWidth = element.clientWidth;
if (currentWidth + viewWidth < left || currentWidth > right) {
continue;
}
hiddenHeight = Math.max(0, top - currentHeight) +
Math.max(0, currentHeight + viewHeight - bottom);
percentHeight = ((viewHeight - hiddenHeight) * 100 / viewHeight) | 0;
visible.push({
id: view.id,
x: currentWidth,
y: currentHeight,
view,
percent: percentHeight,
});
}
let first = visible[0];
let last = visible[visible.length - 1];
if (sortByVisibility) {
visible.sort(function(a, b) {
let pc = a.percent - b.percent;
if (Math.abs(pc) > 0.001) {
return -pc;
}
return a.id - b.id; // ensure stability
});
}
return { first, last, views: visible, };
}
/**
* Event handler to suppress context menu.
*/
function noContextMenuHandler(evt) {
evt.preventDefault();
}
function isDataSchema(url) {
let i = 0, ii = url.length;
while (i < ii && url[i].trim() === '') {
i++;
}
return url.substr(i, 5).toLowerCase() === 'data:';
}
/**
* Returns the filename or guessed filename from the url (see issue 3455).
* @param {string} url - The original PDF location.
* @param {string} defaultFilename - The value returned if the filename is
* unknown, or the protocol is unsupported.
* @returns {string} Guessed PDF filename.
*/
function getPDFFileNameFromURL(url, defaultFilename = 'document.pdf') {
if (isDataSchema(url)) {
console.warn('getPDFFileNameFromURL: ' +
'ignoring "data:" URL for performance reasons.');
return defaultFilename;
}
const reURI = /^(?:(?:[^:]+:)?\/\/[^\/]+)?([^?#]*)(\?[^#]*)?(#.*)?$/;
// SCHEME HOST 1.PATH 2.QUERY 3.REF
// Pattern to get last matching NAME.pdf
const reFilename = /[^\/?#=]+\.pdf\b(?!.*\.pdf\b)/i;
let splitURI = reURI.exec(url);
let suggestedFilename = reFilename.exec(splitURI[1]) ||
reFilename.exec(splitURI[2]) ||
reFilename.exec(splitURI[3]);
if (suggestedFilename) {
suggestedFilename = suggestedFilename[0];
if (suggestedFilename.indexOf('%') !== -1) {
// URL-encoded %2Fpath%2Fto%2Ffile.pdf should be file.pdf
try {
suggestedFilename =
reFilename.exec(decodeURIComponent(suggestedFilename))[0];
} catch (ex) { // Possible (extremely rare) errors:
// URIError "Malformed URI", e.g. for "%AA.pdf"
// TypeError "null has no properties", e.g. for "%2F.pdf"
}
}
}
return suggestedFilename || defaultFilename;
}
function normalizeWheelEventDelta(evt) {
let delta = Math.sqrt(evt.deltaX * evt.deltaX + evt.deltaY * evt.deltaY);
let angle = Math.atan2(evt.deltaY, evt.deltaX);
if (-0.25 * Math.PI < angle && angle < 0.75 * Math.PI) {
// All that is left-up oriented has to change the sign.
delta = -delta;
}
const MOUSE_DOM_DELTA_PIXEL_MODE = 0;
const MOUSE_DOM_DELTA_LINE_MODE = 1;
const MOUSE_PIXELS_PER_LINE = 30;
const MOUSE_LINES_PER_PAGE = 30;
// Converts delta to per-page units
if (evt.deltaMode === MOUSE_DOM_DELTA_PIXEL_MODE) {
delta /= MOUSE_PIXELS_PER_LINE * MOUSE_LINES_PER_PAGE;
} else if (evt.deltaMode === MOUSE_DOM_DELTA_LINE_MODE) {
delta /= MOUSE_LINES_PER_PAGE;
}
return delta;
}
function isValidRotation(angle) {
return Number.isInteger(angle) && angle % 90 === 0;
}
function cloneObj(obj) {
let result = Object.create(null);
for (let i in obj) {
if (Object.prototype.hasOwnProperty.call(obj, i)) {
result[i] = obj[i];
}
}
return result;
}
const WaitOnType = {
EVENT: 'event',
TIMEOUT: 'timeout',
};
/**
* @typedef {Object} WaitOnEventOrTimeoutParameters
* @property {Object} target - The event target, can for example be:
* `window`, `document`, a DOM element, or an {EventBus} instance.
* @property {string} name - The name of the event.
* @property {number} delay - The delay, in milliseconds, after which the
* timeout occurs (if the event wasn't already dispatched).
*/
/**
* Allows waiting for an event or a timeout, whichever occurs first.
* Can be used to ensure that an action always occurs, even when an event
* arrives late or not at all.
*
* @param {WaitOnEventOrTimeoutParameters}
* @returns {Promise} A promise that is resolved with a {WaitOnType} value.
*/
function waitOnEventOrTimeout({ target, name, delay = 0, }) {
if (typeof target !== 'object' || !(name && typeof name === 'string') ||
!(Number.isInteger(delay) && delay >= 0)) {
return Promise.reject(
new Error('waitOnEventOrTimeout - invalid paramaters.'));
}
let capability = createPromiseCapability();
function handler(type) {
if (target instanceof EventBus) {
target.off(name, eventHandler);
} else {
target.removeEventListener(name, eventHandler);
}
if (timeout) {
clearTimeout(timeout);
}
capability.resolve(type);
}
let eventHandler = handler.bind(null, WaitOnType.EVENT);
if (target instanceof EventBus) {
target.on(name, eventHandler);
} else {
target.addEventListener(name, eventHandler);
}
let timeoutHandler = handler.bind(null, WaitOnType.TIMEOUT);
let timeout = setTimeout(timeoutHandler, delay);
return capability.promise;
}
/**
* Promise that is resolved when DOM window becomes visible.
*/
let animationStarted = new Promise(function (resolve) {
window.requestAnimationFrame(resolve);
});
/**
* (deprecated) External localization service.
*/
let mozL10n;
/**
* (deprecated) Promise that is resolved when UI localization is finished.
*/
let localized = Promise.resolve();
/**
* Simple event bus for an application. Listeners are attached using the
* `on` and `off` methods. To raise an event, the `dispatch` method shall be
* used.
*/
class EventBus {
constructor() {
this._listeners = Object.create(null);
}
on(eventName, listener) {
let eventListeners = this._listeners[eventName];
if (!eventListeners) {
eventListeners = [];
this._listeners[eventName] = eventListeners;
}
eventListeners.push(listener);
}
off(eventName, listener) {
let eventListeners = this._listeners[eventName];
let i;
if (!eventListeners || ((i = eventListeners.indexOf(listener)) < 0)) {
return;
}
eventListeners.splice(i, 1);
}
dispatch(eventName) {
let eventListeners = this._listeners[eventName];
if (!eventListeners || eventListeners.length === 0) {
return;
}
// Passing all arguments after the eventName to the listeners.
let args = Array.prototype.slice.call(arguments, 1);
// Making copy of the listeners array in case if it will be modified
// during dispatch.
eventListeners.slice(0).forEach(function (listener) {
listener.apply(null, args);
});
}
}
function clamp(v, min, max) {
return Math.min(Math.max(v, min), max);
}
class ProgressBar {
constructor(id, { height, width, units, } = {}) {
this.visible = true;
// Fetch the sub-elements for later.
this.div = document.querySelector(id + ' .progress');
// Get the loading bar element, so it can be resized to fit the viewer.
this.bar = this.div.parentNode;
// Get options, with sensible defaults.
this.height = height || 100;
this.width = width || 100;
this.units = units || '%';
// Initialize heights.
this.div.style.height = this.height + this.units;
this.percent = 0;
}
_updateBar() {
if (this._indeterminate) {
this.div.classList.add('indeterminate');
this.div.style.width = this.width + this.units;
return;
}
this.div.classList.remove('indeterminate');
let progressSize = this.width * this._percent / 100;
this.div.style.width = progressSize + this.units;
}
get percent() {
return this._percent;
}
set percent(val) {
this._indeterminate = isNaN(val);
this._percent = clamp(val, 0, 100);
this._updateBar();
}
setWidth(viewer) {
if (!viewer) {
return;
}
let container = viewer.parentNode;
let scrollbarWidth = container.offsetWidth - viewer.offsetWidth;
if (scrollbarWidth > 0) {
this.bar.setAttribute('style', 'width: calc(100% - ' +
scrollbarWidth + 'px);');
}
}
hide() {
if (!this.visible) {
return;
}
this.visible = false;
this.bar.classList.add('hidden');
document.body.classList.remove('loadingInProgress');
}
show() {
if (this.visible) {
return;
}
this.visible = true;
document.body.classList.add('loadingInProgress');
this.bar.classList.remove('hidden');
}
}
export {
CSS_UNITS,
DEFAULT_SCALE_VALUE,
DEFAULT_SCALE,
MIN_SCALE,
MAX_SCALE,
UNKNOWN_SCALE,
MAX_AUTO_SCALE,
SCROLLBAR_PADDING,
VERTICAL_PADDING,
isValidRotation,
cloneObj,
PresentationModeState,
RendererType,
mozL10n,
NullL10n,
EventBus,
ProgressBar,
getPDFFileNameFromURL,
noContextMenuHandler,
parseQueryString,
getVisibleElements,
roundToDivide,
approximateFraction,
getOutputScale,
scrollIntoView,
watchScroll,
binarySearchFirstItem,
normalizeWheelEventDelta,
animationStarted,
localized,
WaitOnType,
waitOnEventOrTimeout,
};
// WEBPACK FOOTER //
// web/ui_utils.js |