pdfjs-dist
Version:
Generic build of Mozilla's PDF.js library.
130 lines (129 loc) • 4.1 kB
JavaScript
/**
* @licstart The following is the entire license notice for the
* JavaScript code in this page
*
* Copyright 2022 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.TextLayerBuilder = void 0;
var _pdf = require("../pdf");
class TextLayerBuilder {
constructor({
textLayerDiv,
eventBus,
pageIndex,
viewport,
highlighter = null,
accessibilityManager = null
}) {
this.textLayerDiv = textLayerDiv;
this.eventBus = eventBus;
this.textContent = null;
this.textContentItemsStr = [];
this.textContentStream = null;
this.renderingDone = false;
this.pageNumber = pageIndex + 1;
this.viewport = viewport;
this.textDivs = [];
this.textLayerRenderTask = null;
this.highlighter = highlighter;
this.accessibilityManager = accessibilityManager;
this.#bindMouse();
}
#finishRendering() {
this.renderingDone = true;
const endOfContent = document.createElement("div");
endOfContent.className = "endOfContent";
this.textLayerDiv.append(endOfContent);
this.eventBus.dispatch("textlayerrendered", {
source: this,
pageNumber: this.pageNumber,
numTextDivs: this.textDivs.length
});
}
render(timeout = 0) {
if (!(this.textContent || this.textContentStream) || this.renderingDone) {
return;
}
this.cancel();
this.textDivs.length = 0;
this.highlighter?.setTextMapping(this.textDivs, this.textContentItemsStr);
this.accessibilityManager?.setTextMapping(this.textDivs);
const textLayerFrag = document.createDocumentFragment();
this.textLayerRenderTask = (0, _pdf.renderTextLayer)({
textContent: this.textContent,
textContentStream: this.textContentStream,
container: textLayerFrag,
viewport: this.viewport,
textDivs: this.textDivs,
textContentItemsStr: this.textContentItemsStr,
timeout
});
this.textLayerRenderTask.promise.then(() => {
this.textLayerDiv.append(textLayerFrag);
this.#finishRendering();
this.highlighter?.enable();
this.accessibilityManager?.enable();
}, function (reason) {});
}
cancel() {
if (this.textLayerRenderTask) {
this.textLayerRenderTask.cancel();
this.textLayerRenderTask = null;
}
this.highlighter?.disable();
this.accessibilityManager?.disable();
}
setTextContentStream(readableStream) {
this.cancel();
this.textContentStream = readableStream;
}
setTextContent(textContent) {
this.cancel();
this.textContent = textContent;
}
#bindMouse() {
const div = this.textLayerDiv;
div.addEventListener("mousedown", evt => {
const end = div.querySelector(".endOfContent");
if (!end) {
return;
}
let adjustTop = evt.target !== div;
adjustTop &&= getComputedStyle(end).getPropertyValue("-moz-user-select") !== "none";
if (adjustTop) {
const divBounds = div.getBoundingClientRect();
const r = Math.max(0, (evt.pageY - divBounds.top) / divBounds.height);
end.style.top = (r * 100).toFixed(2) + "%";
}
end.classList.add("active");
});
div.addEventListener("mouseup", () => {
const end = div.querySelector(".endOfContent");
if (!end) {
return;
}
end.style.top = "";
end.classList.remove("active");
});
}
}
exports.TextLayerBuilder = TextLayerBuilder;