pdfjs-dist/lib/web/pdf_page_view.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2019 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.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.PDFPageView = void 0;

var _regenerator = _interopRequireDefault(require("@babel/runtime/regenerator"));

var _ui_utils = require("./ui_utils");

var _pdf = require("../pdf");

var _pdf_rendering_queue = require("./pdf_rendering_queue");

var _viewer_compatibility = require("./viewer_compatibility");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }

function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var MAX_CANVAS_PIXELS = _viewer_compatibility.viewerCompatibilityParams.maxCanvasPixels || 16777216;

var PDFPageView =
/*#__PURE__*/
function () {
  function PDFPageView(options) {
    _classCallCheck(this, PDFPageView);

    var container = options.container;
    var defaultViewport = options.defaultViewport;
    this.id = options.id;
    this.renderingId = 'page' + this.id;
    this.pdfPage = null;
    this.pageLabel = null;
    this.rotation = 0;
    this.scale = options.scale || _ui_utils.DEFAULT_SCALE;
    this.viewport = defaultViewport;
    this.pdfPageRotate = defaultViewport.rotation;
    this.hasRestrictedScaling = false;
    this.textLayerMode = Number.isInteger(options.textLayerMode) ? options.textLayerMode : _ui_utils.TextLayerMode.ENABLE;
    this.imageResourcesPath = options.imageResourcesPath || '';
    this.renderInteractiveForms = options.renderInteractiveForms || false;
    this.useOnlyCssZoom = options.useOnlyCssZoom || false;
    this.maxCanvasPixels = options.maxCanvasPixels || MAX_CANVAS_PIXELS;
    this.eventBus = options.eventBus || (0, _ui_utils.getGlobalEventBus)();
    this.renderingQueue = options.renderingQueue;
    this.textLayerFactory = options.textLayerFactory;
    this.annotationLayerFactory = options.annotationLayerFactory;
    this.renderer = options.renderer || _ui_utils.RendererType.CANVAS;
    this.enableWebGL = options.enableWebGL || false;
    this.l10n = options.l10n || _ui_utils.NullL10n;
    this.paintTask = null;
    this.paintedViewportMap = new WeakMap();
    this.renderingState = _pdf_rendering_queue.RenderingStates.INITIAL;
    this.resume = null;
    this.error = null;
    this.onBeforeDraw = null;
    this.onAfterDraw = null;
    this.annotationLayer = null;
    this.textLayer = null;
    this.zoomLayer = null;
    var div = document.createElement('div');
    div.className = 'page';
    div.style.width = Math.floor(this.viewport.width) + 'px';
    div.style.height = Math.floor(this.viewport.height) + 'px';
    div.setAttribute('data-page-number', this.id);
    this.div = div;
    container.appendChild(div);
  }

  _createClass(PDFPageView, [{
    key: "setPdfPage",
    value: function setPdfPage(pdfPage) {
      this.pdfPage = pdfPage;
      this.pdfPageRotate = pdfPage.rotate;
      var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
      this.viewport = pdfPage.getViewport({
        scale: this.scale * _ui_utils.CSS_UNITS,
        rotation: totalRotation
      });
      this.stats = pdfPage.stats;
      this.reset();
    }
  }, {
    key: "destroy",
    value: function destroy() {
      this.reset();

      if (this.pdfPage) {
        this.pdfPage.cleanup();
      }
    }
  }, {
    key: "_resetZoomLayer",
    value: function _resetZoomLayer() {
      var removeFromDOM = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;

      if (!this.zoomLayer) {
        return;
      }

      var zoomLayerCanvas = this.zoomLayer.firstChild;
      this.paintedViewportMap["delete"](zoomLayerCanvas);
      zoomLayerCanvas.width = 0;
      zoomLayerCanvas.height = 0;

      if (removeFromDOM) {
        this.zoomLayer.remove();
      }

      this.zoomLayer = null;
    }
  }, {
    key: "reset",
    value: function reset() {
      var keepZoomLayer = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
      var keepAnnotations = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
      this.cancelRendering(keepAnnotations);
      this.renderingState = _pdf_rendering_queue.RenderingStates.INITIAL;
      var div = this.div;
      div.style.width = Math.floor(this.viewport.width) + 'px';
      div.style.height = Math.floor(this.viewport.height) + 'px';
      var childNodes = div.childNodes;
      var currentZoomLayerNode = keepZoomLayer && this.zoomLayer || null;
      var currentAnnotationNode = keepAnnotations && this.annotationLayer && this.annotationLayer.div || null;

      for (var i = childNodes.length - 1; i >= 0; i--) {
        var node = childNodes[i];

        if (currentZoomLayerNode === node || currentAnnotationNode === node) {
          continue;
        }

        div.removeChild(node);
      }

      div.removeAttribute('data-loaded');

      if (currentAnnotationNode) {
        this.annotationLayer.hide();
      } else if (this.annotationLayer) {
        this.annotationLayer.cancel();
        this.annotationLayer = null;
      }

      if (!currentZoomLayerNode) {
        if (this.canvas) {
          this.paintedViewportMap["delete"](this.canvas);
          this.canvas.width = 0;
          this.canvas.height = 0;
          delete this.canvas;
        }

        this._resetZoomLayer();
      }

      if (this.svg) {
        this.paintedViewportMap["delete"](this.svg);
        delete this.svg;
      }

      this.loadingIconDiv = document.createElement('div');
      this.loadingIconDiv.className = 'loadingIcon';
      div.appendChild(this.loadingIconDiv);
    }
  }, {
    key: "update",
    value: function update(scale, rotation) {
      this.scale = scale || this.scale;

      if (typeof rotation !== 'undefined') {
        this.rotation = rotation;
      }

      var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
      this.viewport = this.viewport.clone({
        scale: this.scale * _ui_utils.CSS_UNITS,
        rotation: totalRotation
      });

      if (this.svg) {
        this.cssTransform(this.svg, true);
        this.eventBus.dispatch('pagerendered', {
          source: this,
          pageNumber: this.id,
          cssTransform: true
        });
        return;
      }

      var isScalingRestricted = false;

      if (this.canvas && this.maxCanvasPixels > 0) {
        var outputScale = this.outputScale;

        if ((Math.floor(this.viewport.width) * outputScale.sx | 0) * (Math.floor(this.viewport.height) * outputScale.sy | 0) > this.maxCanvasPixels) {
          isScalingRestricted = true;
        }
      }

      if (this.canvas) {
        if (this.useOnlyCssZoom || this.hasRestrictedScaling && isScalingRestricted) {
          this.cssTransform(this.canvas, true);
          this.eventBus.dispatch('pagerendered', {
            source: this,
            pageNumber: this.id,
            cssTransform: true
          });
          return;
        }

        if (!this.zoomLayer && !this.canvas.hasAttribute('hidden')) {
          this.zoomLayer = this.canvas.parentNode;
          this.zoomLayer.style.position = 'absolute';
        }
      }

      if (this.zoomLayer) {
        this.cssTransform(this.zoomLayer.firstChild);
      }

      this.reset(true, true);
    }
  }, {
    key: "cancelRendering",
    value: function cancelRendering() {
      var keepAnnotations = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;

      if (this.paintTask) {
        this.paintTask.cancel();
        this.paintTask = null;
      }

      this.resume = null;

      if (this.textLayer) {
        this.textLayer.cancel();
        this.textLayer = null;
      }

      if (!keepAnnotations && this.annotationLayer) {
        this.annotationLayer.cancel();
        this.annotationLayer = null;
      }
    }
  }, {
    key: "cssTransform",
    value: function cssTransform(target) {
      var redrawAnnotations = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
      var width = this.viewport.width;
      var height = this.viewport.height;
      var div = this.div;
      target.style.width = target.parentNode.style.width = div.style.width = Math.floor(width) + 'px';
      target.style.height = target.parentNode.style.height = div.style.height = Math.floor(height) + 'px';
      var relativeRotation = this.viewport.rotation - this.paintedViewportMap.get(target).rotation;
      var absRotation = Math.abs(relativeRotation);
      var scaleX = 1,
          scaleY = 1;

      if (absRotation === 90 || absRotation === 270) {
        scaleX = height / width;
        scaleY = width / height;
      }

      var cssTransform = 'rotate(' + relativeRotation + 'deg) ' + 'scale(' + scaleX + ',' + scaleY + ')';
      target.style.transform = cssTransform;

      if (this.textLayer) {
        var textLayerViewport = this.textLayer.viewport;
        var textRelativeRotation = this.viewport.rotation - textLayerViewport.rotation;
        var textAbsRotation = Math.abs(textRelativeRotation);
        var scale = width / textLayerViewport.width;

        if (textAbsRotation === 90 || textAbsRotation === 270) {
          scale = width / textLayerViewport.height;
        }

        var textLayerDiv = this.textLayer.textLayerDiv;
        var transX, transY;

        switch (textAbsRotation) {
          case 0:
            transX = transY = 0;
            break;

          case 90:
            transX = 0;
            transY = '-' + textLayerDiv.style.height;
            break;

          case 180:
            transX = '-' + textLayerDiv.style.width;
            transY = '-' + textLayerDiv.style.height;
            break;

          case 270:
            transX = '-' + textLayerDiv.style.width;
            transY = 0;
            break;

          default:
            console.error('Bad rotation value.');
            break;
        }

        textLayerDiv.style.transform = 'rotate(' + textAbsRotation + 'deg) ' + 'scale(' + scale + ', ' + scale + ') ' + 'translate(' + transX + ', ' + transY + ')';
        textLayerDiv.style.transformOrigin = '0% 0%';
      }

      if (redrawAnnotations && this.annotationLayer) {
        this.annotationLayer.render(this.viewport, 'display');
      }
    }
  }, {
    key: "getPagePoint",
    value: function getPagePoint(x, y) {
      return this.viewport.convertToPdfPoint(x, y);
    }
  }, {
    key: "draw",
    value: function draw() {
      var _this = this;

      if (this.renderingState !== _pdf_rendering_queue.RenderingStates.INITIAL) {
        console.error('Must be in new state before drawing');
        this.reset();
      }

      if (!this.pdfPage) {
        this.renderingState = _pdf_rendering_queue.RenderingStates.FINISHED;
        return Promise.reject(new Error('Page is not loaded'));
      }

      this.renderingState = _pdf_rendering_queue.RenderingStates.RUNNING;
      var pdfPage = this.pdfPage;
      var div = this.div;
      var canvasWrapper = document.createElement('div');
      canvasWrapper.style.width = div.style.width;
      canvasWrapper.style.height = div.style.height;
      canvasWrapper.classList.add('canvasWrapper');

      if (this.annotationLayer && this.annotationLayer.div) {
        div.insertBefore(canvasWrapper, this.annotationLayer.div);
      } else {
        div.appendChild(canvasWrapper);
      }

      var textLayer = null;

      if (this.textLayerMode !== _ui_utils.TextLayerMode.DISABLE && this.textLayerFactory) {
        var textLayerDiv = document.createElement('div');
        textLayerDiv.className = 'textLayer';
        textLayerDiv.style.width = canvasWrapper.style.width;
        textLayerDiv.style.height = canvasWrapper.style.height;

        if (this.annotationLayer && this.annotationLayer.div) {
          div.insertBefore(textLayerDiv, this.annotationLayer.div);
        } else {
          div.appendChild(textLayerDiv);
        }

        textLayer = this.textLayerFactory.createTextLayerBuilder(textLayerDiv, this.id - 1, this.viewport, this.textLayerMode === _ui_utils.TextLayerMode.ENABLE_ENHANCE);
      }

      this.textLayer = textLayer;
      var renderContinueCallback = null;

      if (this.renderingQueue) {
        renderContinueCallback = function renderContinueCallback(cont) {
          if (!_this.renderingQueue.isHighestPriority(_this)) {
            _this.renderingState = _pdf_rendering_queue.RenderingStates.PAUSED;

            _this.resume = function () {
              _this.renderingState = _pdf_rendering_queue.RenderingStates.RUNNING;
              cont();
            };

            return;
          }

          cont();
        };
      }

      var finishPaintTask =
      /*#__PURE__*/
      function () {
        var _ref = _asyncToGenerator(
        /*#__PURE__*/
        _regenerator["default"].mark(function _callee(error) {
          return _regenerator["default"].wrap(function _callee$(_context) {
            while (1) {
              switch (_context.prev = _context.next) {
                case 0:
                  if (paintTask === _this.paintTask) {
                    _this.paintTask = null;
                  }

                  if (!(error instanceof _pdf.RenderingCancelledException)) {
                    _context.next = 4;
                    break;
                  }

                  _this.error = null;
                  return _context.abrupt("return");

                case 4:
                  _this.renderingState = _pdf_rendering_queue.RenderingStates.FINISHED;

                  if (_this.loadingIconDiv) {
                    div.removeChild(_this.loadingIconDiv);
                    delete _this.loadingIconDiv;
                  }

                  _this._resetZoomLayer(true);

                  _this.error = error;
                  _this.stats = pdfPage.stats;

                  if (_this.onAfterDraw) {
                    _this.onAfterDraw();
                  }

                  _this.eventBus.dispatch('pagerendered', {
                    source: _this,
                    pageNumber: _this.id,
                    cssTransform: false
                  });

                  if (!error) {
                    _context.next = 13;
                    break;
                  }

                  throw error;

                case 13:
                case "end":
                  return _context.stop();
              }
            }
          }, _callee);
        }));

        return function finishPaintTask(_x) {
          return _ref.apply(this, arguments);
        };
      }();

      var paintTask = this.renderer === _ui_utils.RendererType.SVG ? this.paintOnSvg(canvasWrapper) : this.paintOnCanvas(canvasWrapper);
      paintTask.onRenderContinue = renderContinueCallback;
      this.paintTask = paintTask;
      var resultPromise = paintTask.promise.then(function () {
        return finishPaintTask(null).then(function () {
          if (textLayer) {
            var readableStream = pdfPage.streamTextContent({
              normalizeWhitespace: true
            });
            textLayer.setTextContentStream(readableStream);
            textLayer.render();
          }
        });
      }, function (reason) {
        return finishPaintTask(reason);
      });

      if (this.annotationLayerFactory) {
        if (!this.annotationLayer) {
          this.annotationLayer = this.annotationLayerFactory.createAnnotationLayerBuilder(div, pdfPage, this.imageResourcesPath, this.renderInteractiveForms, this.l10n);
        }

        this.annotationLayer.render(this.viewport, 'display');
      }

      div.setAttribute('data-loaded', true);

      if (this.onBeforeDraw) {
        this.onBeforeDraw();
      }

      return resultPromise;
    }
  }, {
    key: "paintOnCanvas",
    value: function paintOnCanvas(canvasWrapper) {
      var renderCapability = (0, _pdf.createPromiseCapability)();
      var result = {
        promise: renderCapability.promise,
        onRenderContinue: function onRenderContinue(cont) {
          cont();
        },
        cancel: function cancel() {
          renderTask.cancel();
        }
      };
      var viewport = this.viewport;
      var canvas = document.createElement('canvas');
      canvas.id = this.renderingId;
      canvas.setAttribute('hidden', 'hidden');
      var isCanvasHidden = true;

      var showCanvas = function showCanvas() {
        if (isCanvasHidden) {
          canvas.removeAttribute('hidden');
          isCanvasHidden = false;
        }
      };

      canvasWrapper.appendChild(canvas);
      this.canvas = canvas;
      canvas.mozOpaque = true;
      var ctx = canvas.getContext('2d', {
        alpha: false
      });
      var outputScale = (0, _ui_utils.getOutputScale)(ctx);
      this.outputScale = outputScale;

      if (this.useOnlyCssZoom) {
        var actualSizeViewport = viewport.clone({
          scale: _ui_utils.CSS_UNITS
        });
        outputScale.sx *= actualSizeViewport.width / viewport.width;
        outputScale.sy *= actualSizeViewport.height / viewport.height;
        outputScale.scaled = true;
      }

      if (this.maxCanvasPixels > 0) {
        var pixelsInViewport = viewport.width * viewport.height;
        var maxScale = Math.sqrt(this.maxCanvasPixels / pixelsInViewport);

        if (outputScale.sx > maxScale || outputScale.sy > maxScale) {
          outputScale.sx = maxScale;
          outputScale.sy = maxScale;
          outputScale.scaled = true;
          this.hasRestrictedScaling = true;
        } else {
          this.hasRestrictedScaling = false;
        }
      }

      var sfx = (0, _ui_utils.approximateFraction)(outputScale.sx);
      var sfy = (0, _ui_utils.approximateFraction)(outputScale.sy);
      canvas.width = (0, _ui_utils.roundToDivide)(viewport.width * outputScale.sx, sfx[0]);
      canvas.height = (0, _ui_utils.roundToDivide)(viewport.height * outputScale.sy, sfy[0]);
      canvas.style.width = (0, _ui_utils.roundToDivide)(viewport.width, sfx[1]) + 'px';
      canvas.style.height = (0, _ui_utils.roundToDivide)(viewport.height, sfy[1]) + 'px';
      this.paintedViewportMap.set(canvas, viewport);
      var transform = !outputScale.scaled ? null : [outputScale.sx, 0, 0, outputScale.sy, 0, 0];
      var renderContext = {
        canvasContext: ctx,
        transform: transform,
        viewport: this.viewport,
        enableWebGL: this.enableWebGL,
        renderInteractiveForms: this.renderInteractiveForms
      };
      var renderTask = this.pdfPage.render(renderContext);

      renderTask.onContinue = function (cont) {
        showCanvas();

        if (result.onRenderContinue) {
          result.onRenderContinue(cont);
        } else {
          cont();
        }
      };

      renderTask.promise.then(function () {
        showCanvas();
        renderCapability.resolve(undefined);
      }, function (error) {
        showCanvas();
        renderCapability.reject(error);
      });
      return result;
    }
  }, {
    key: "paintOnSvg",
    value: function paintOnSvg(wrapper) {
      var _this2 = this;

      var cancelled = false;

      var ensureNotCancelled = function ensureNotCancelled() {
        if (cancelled) {
          throw new _pdf.RenderingCancelledException('Rendering cancelled, page ' + _this2.id, 'svg');
        }
      };

      var pdfPage = this.pdfPage;
      var actualSizeViewport = this.viewport.clone({
        scale: _ui_utils.CSS_UNITS
      });
      var promise = pdfPage.getOperatorList().then(function (opList) {
        ensureNotCancelled();
        var svgGfx = new _pdf.SVGGraphics(pdfPage.commonObjs, pdfPage.objs);
        return svgGfx.getSVG(opList, actualSizeViewport).then(function (svg) {
          ensureNotCancelled();
          _this2.svg = svg;

          _this2.paintedViewportMap.set(svg, actualSizeViewport);

          svg.style.width = wrapper.style.width;
          svg.style.height = wrapper.style.height;
          _this2.renderingState = _pdf_rendering_queue.RenderingStates.FINISHED;
          wrapper.appendChild(svg);
        });
      });
      return {
        promise: promise,
        onRenderContinue: function onRenderContinue(cont) {
          cont();
        },
        cancel: function cancel() {
          cancelled = true;
        }
      };
    }
  }, {
    key: "setPageLabel",
    value: function setPageLabel(label) {
      this.pageLabel = typeof label === 'string' ? label : null;

      if (this.pageLabel !== null) {
        this.div.setAttribute('data-page-label', this.pageLabel);
      } else {
        this.div.removeAttribute('data-page-label');
      }
    }
  }, {
    key: "width",
    get: function get() {
      return this.viewport.width;
    }
  }, {
    key: "height",
    get: function get() {
      return this.viewport.height;
    }
  }]);

  return PDFPageView;
}();

exports.PDFPageView = PDFPageView;