[IMP] website: PDFJS lib - GitHub import

* Import src, web and external directories from PDFJS GitHub repo

1 files changed, 394 insertions, 0 deletions

diff --git a/addons/website/static/lib/pdfjs/web/ui_utils.js b/addons/website/static/lib/pdfjs/web/ui_utils.js
new file mode 100644
index 00000000000..7e798e34270
--- /dev/null
+++ b/addons/website/static/lib/pdfjs/web/ui_utils.js
@@ -0,0 +1,394 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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.
+ */
+
+'use strict';
+
+var CSS_UNITS = 96.0 / 72.0;
+var DEFAULT_SCALE = 'auto';
+var UNKNOWN_SCALE = 0;
+var MAX_AUTO_SCALE = 1.25;
+var SCROLLBAR_PADDING = 40;
+var VERTICAL_PADDING = 5;
+
+// optimised CSS custom property getter/setter
+var CustomStyle = (function CustomStyleClosure() {
+
+  // As noted on: http://www.zachstronaut.com/posts/2009/02/17/
+  //              animate-css-transforms-firefox-webkit.html
+  // in some versions of IE9 it is critical that ms appear in this list
+  // before Moz
+  var prefixes = ['ms', 'Moz', 'Webkit', 'O'];
+  var _cache = {};
+
+  function CustomStyle() {}
+
+  CustomStyle.getProp = function get(propName, element) {
+    // check cache only when no element is given
+    if (arguments.length === 1 && typeof _cache[propName] === 'string') {
+      return _cache[propName];
+    }
+
+    element = element || document.documentElement;
+    var style = element.style, prefixed, uPropName;
+
+    // test standard property first
+    if (typeof style[propName] === 'string') {
+      return (_cache[propName] = propName);
+    }
+
+    // capitalize
+    uPropName = propName.charAt(0).toUpperCase() + propName.slice(1);
+
+    // test vendor specific properties
+    for (var i = 0, l = prefixes.length; i < l; i++) {
+      prefixed = prefixes[i] + uPropName;
+      if (typeof style[prefixed] === 'string') {
+        return (_cache[propName] = prefixed);
+      }
+    }
+
+    //if all fails then set to undefined
+    return (_cache[propName] = 'undefined');
+  };
+
+  CustomStyle.setProp = function set(propName, element, str) {
+    var prop = this.getProp(propName);
+    if (prop !== 'undefined') {
+      element.style[prop] = str;
+    }
+  };
+
+  return CustomStyle;
+})();
+
+function getFileName(url) {
+  var anchor = url.indexOf('#');
+  var query = url.indexOf('?');
+  var end = Math.min(
+    anchor > 0 ? anchor : url.length,
+    query > 0 ? query : url.length);
+  return url.substring(url.lastIndexOf('/', end) + 1, end);
+}
+
+/**
+ * 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) {
+  var devicePixelRatio = window.devicePixelRatio || 1;
+  var backingStoreRatio = ctx.webkitBackingStorePixelRatio ||
+                          ctx.mozBackingStorePixelRatio ||
+                          ctx.msBackingStorePixelRatio ||
+                          ctx.oBackingStorePixelRatio ||
+                          ctx.backingStorePixelRatio || 1;
+  var pixelRatio = devicePixelRatio / backingStoreRatio;
+  return {
+    sx: pixelRatio,
+    sy: pixelRatio,
+    scaled: pixelRatio !== 1
+  };
+}
+
+/**
+ * Scrolls specified element into view of its parent.
+ * element {Object} The element to be visible.
+ * spot {Object} An object with optional top and left properties,
+ *               specifying the offset from the top left edge.
+ */
+function scrollIntoView(element, spot) {
+  // 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 animationStartedClosure.
+  var parent = element.offsetParent;
+  var offsetY = element.offsetTop + element.clientTop;
+  var offsetX = element.offsetLeft + element.clientLeft;
+  if (!parent) {
+    console.error('offsetParent is not set -- cannot scroll');
+    return;
+  }
+  while (parent.clientHeight === parent.scrollHeight) {
+    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) {
+  var debounceScroll = function debounceScroll(evt) {
+    if (rAF) {
+      return;
+    }
+    // schedule an invocation of scroll for next animation frame.
+    rAF = window.requestAnimationFrame(function viewAreaElementScrolled() {
+      rAF = null;
+
+      var currentY = viewAreaElement.scrollTop;
+      var lastY = state.lastY;
+      if (currentY !== lastY) {
+        state.down = currentY > lastY;
+      }
+      state.lastY = currentY;
+      callback(state);
+    });
+  };
+
+  var state = {
+    down: true,
+    lastY: viewAreaElement.scrollTop,
+    _eventHandler: debounceScroll
+  };
+
+  var rAF = null;
+  viewAreaElement.addEventListener('scroll', debounceScroll, true);
+  return state;
+}
+
+/**
+ * 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) {
+  var minIndex = 0;
+  var maxIndex = items.length - 1;
+
+  if (items.length === 0 || !condition(items[maxIndex])) {
+    return items.length;
+  }
+  if (condition(items[minIndex])) {
+    return minIndex;
+  }
+
+  while (minIndex < maxIndex) {
+    var currentIndex = (minIndex + maxIndex) >> 1;
+    var currentItem = items[currentIndex];
+    if (condition(currentItem)) {
+      maxIndex = currentIndex;
+    } else {
+      minIndex = currentIndex + 1;
+    }
+  }
+  return minIndex; /* === maxIndex */
+}
+
+/**
+ * Generic helper to find out what elements are visible within a scroll pane.
+ */
+function getVisibleElements(scrollEl, views, sortByVisibility) {
+  var top = scrollEl.scrollTop, bottom = top + scrollEl.clientHeight;
+  var left = scrollEl.scrollLeft, right = left + scrollEl.clientWidth;
+
+  function isElementBottomBelowViewTop(view) {
+    var element = view.div;
+    var elementBottom =
+      element.offsetTop + element.clientTop + element.clientHeight;
+    return elementBottom > top;
+  }
+
+  var visible = [], view, element;
+  var currentHeight, viewHeight, hiddenHeight, percentHeight;
+  var currentWidth, viewWidth;
+  var firstVisibleElementInd = (views.length === 0) ? 0 :
+    binarySearchFirstItem(views, isElementBottomBelowViewTop);
+
+  for (var 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: view,
+      percent: percentHeight
+    });
+  }
+
+  var first = visible[0];
+  var last = visible[visible.length - 1];
+
+  if (sortByVisibility) {
+    visible.sort(function(a, b) {
+      var pc = a.percent - b.percent;
+      if (Math.abs(pc) > 0.001) {
+        return -pc;
+      }
+      return a.id - b.id; // ensure stability
+    });
+  }
+  return {first: first, last: last, views: visible};
+}
+
+/**
+ * Event handler to suppress context menu.
+ */
+function noContextMenuHandler(e) {
+  e.preventDefault();
+}
+
+/**
+ * Returns the filename or guessed filename from the url (see issue 3455).
+ * url {String} The original PDF location.
+ * @return {String} Guessed PDF file name.
+ */
+function getPDFFileNameFromURL(url) {
+  var reURI = /^(?:([^:]+:)?\/\/[^\/]+)?([^?#]*)(\?[^#]*)?(#.*)?$/;
+  //            SCHEME      HOST         1.PATH  2.QUERY   3.REF
+  // Pattern to get last matching NAME.pdf
+  var reFilename = /[^\/?#=]+\.pdf\b(?!.*\.pdf\b)/i;
+  var splitURI = reURI.exec(url);
+  var 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(e) { // Possible (extremely rare) errors:
+        // URIError "Malformed URI", e.g. for "%AA.pdf"
+        // TypeError "null has no properties", e.g. for "%2F.pdf"
+      }
+    }
+  }
+  return suggestedFilename || 'document.pdf';
+}
+
+var ProgressBar = (function ProgressBarClosure() {
+
+  function clamp(v, min, max) {
+    return Math.min(Math.max(v, min), max);
+  }
+
+  function ProgressBar(id, opts) {
+    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 = opts.height || 100;
+    this.width = opts.width || 100;
+    this.units = opts.units || '%';
+
+    // Initialize heights.
+    this.div.style.height = this.height + this.units;
+    this.percent = 0;
+  }
+
+  ProgressBar.prototype = {
+
+    updateBar: function ProgressBar_updateBar() {
+      if (this._indeterminate) {
+        this.div.classList.add('indeterminate');
+        this.div.style.width = this.width + this.units;
+        return;
+      }
+
+      this.div.classList.remove('indeterminate');
+      var 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: function ProgressBar_setWidth(viewer) {
+      if (viewer) {
+        var container = viewer.parentNode;
+        var scrollbarWidth = container.offsetWidth - viewer.offsetWidth;
+        if (scrollbarWidth > 0) {
+          this.bar.setAttribute('style', 'width: calc(100% - ' +
+                                         scrollbarWidth + 'px);');
+        }
+      }
+    },
+
+    hide: function ProgressBar_hide() {
+      if (!this.visible) {
+        return;
+      }
+      this.visible = false;
+      this.bar.classList.add('hidden');
+      document.body.classList.remove('loadingInProgress');
+    },
+
+    show: function ProgressBar_show() {
+      if (this.visible) {
+        return;
+      }
+      this.visible = true;
+      document.body.classList.add('loadingInProgress');
+      this.bar.classList.remove('hidden');
+    }
+  };
+
+  return ProgressBar;
+})();