mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-11-25 17:33:49 +01:00
420 lines
14 KiB
JavaScript
420 lines
14 KiB
JavaScript
/* -*- 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.
|
|
*/
|
|
/* globals CustomStyle, PDFJS */
|
|
|
|
'use strict';
|
|
|
|
var MAX_TEXT_DIVS_TO_RENDER = 100000;
|
|
|
|
var NonWhitespaceRegexp = /\S/;
|
|
|
|
function isAllWhitespace(str) {
|
|
return !NonWhitespaceRegexp.test(str);
|
|
}
|
|
|
|
/**
|
|
* @typedef {Object} TextLayerBuilderOptions
|
|
* @property {HTMLDivElement} textLayerDiv - The text layer container.
|
|
* @property {number} pageIndex - The page index.
|
|
* @property {PageViewport} viewport - The viewport of the text layer.
|
|
* @property {PDFFindController} findController
|
|
*/
|
|
|
|
/**
|
|
* TextLayerBuilder provides text-selection functionality for the PDF.
|
|
* It does this by creating overlay divs over the PDF text. These divs
|
|
* contain text that matches the PDF text they are overlaying. This object
|
|
* also provides a way to highlight text that is being searched for.
|
|
* @class
|
|
*/
|
|
var TextLayerBuilder = (function TextLayerBuilderClosure() {
|
|
function TextLayerBuilder(options) {
|
|
this.textLayerDiv = options.textLayerDiv;
|
|
this.renderingDone = false;
|
|
this.divContentDone = false;
|
|
this.pageIdx = options.pageIndex;
|
|
this.pageNumber = this.pageIdx + 1;
|
|
this.matches = [];
|
|
this.viewport = options.viewport;
|
|
this.textDivs = [];
|
|
this.findController = options.findController || null;
|
|
}
|
|
|
|
TextLayerBuilder.prototype = {
|
|
_finishRendering: function TextLayerBuilder_finishRendering() {
|
|
this.renderingDone = true;
|
|
|
|
var event = document.createEvent('CustomEvent');
|
|
event.initCustomEvent('textlayerrendered', true, true, {
|
|
pageNumber: this.pageNumber
|
|
});
|
|
this.textLayerDiv.dispatchEvent(event);
|
|
},
|
|
|
|
renderLayer: function TextLayerBuilder_renderLayer() {
|
|
var textLayerFrag = document.createDocumentFragment();
|
|
var textDivs = this.textDivs;
|
|
var textDivsLength = textDivs.length;
|
|
var canvas = document.createElement('canvas');
|
|
var ctx = canvas.getContext('2d');
|
|
|
|
// No point in rendering many divs as it would make the browser
|
|
// unusable even after the divs are rendered.
|
|
if (textDivsLength > MAX_TEXT_DIVS_TO_RENDER) {
|
|
this._finishRendering();
|
|
return;
|
|
}
|
|
|
|
var lastFontSize;
|
|
var lastFontFamily;
|
|
for (var i = 0; i < textDivsLength; i++) {
|
|
var textDiv = textDivs[i];
|
|
if (textDiv.dataset.isWhitespace !== undefined) {
|
|
continue;
|
|
}
|
|
|
|
var fontSize = textDiv.style.fontSize;
|
|
var fontFamily = textDiv.style.fontFamily;
|
|
|
|
// Only build font string and set to context if different from last.
|
|
if (fontSize !== lastFontSize || fontFamily !== lastFontFamily) {
|
|
ctx.font = fontSize + ' ' + fontFamily;
|
|
lastFontSize = fontSize;
|
|
lastFontFamily = fontFamily;
|
|
}
|
|
|
|
var width = ctx.measureText(textDiv.textContent).width;
|
|
if (width > 0) {
|
|
textLayerFrag.appendChild(textDiv);
|
|
var transform;
|
|
if (textDiv.dataset.canvasWidth !== undefined) {
|
|
// Dataset values come of type string.
|
|
var textScale = textDiv.dataset.canvasWidth / width;
|
|
transform = 'scaleX(' + textScale + ')';
|
|
} else {
|
|
transform = '';
|
|
}
|
|
var rotation = textDiv.dataset.angle;
|
|
if (rotation) {
|
|
transform = 'rotate(' + rotation + 'deg) ' + transform;
|
|
}
|
|
if (transform) {
|
|
CustomStyle.setProp('transform' , textDiv, transform);
|
|
}
|
|
}
|
|
}
|
|
|
|
this.textLayerDiv.appendChild(textLayerFrag);
|
|
this._finishRendering();
|
|
this.updateMatches();
|
|
},
|
|
|
|
/**
|
|
* Renders the text layer.
|
|
* @param {number} timeout (optional) if specified, the rendering waits
|
|
* for specified amount of ms.
|
|
*/
|
|
render: function TextLayerBuilder_render(timeout) {
|
|
if (!this.divContentDone || this.renderingDone) {
|
|
return;
|
|
}
|
|
|
|
if (this.renderTimer) {
|
|
clearTimeout(this.renderTimer);
|
|
this.renderTimer = null;
|
|
}
|
|
|
|
if (!timeout) { // Render right away
|
|
this.renderLayer();
|
|
} else { // Schedule
|
|
var self = this;
|
|
this.renderTimer = setTimeout(function() {
|
|
self.renderLayer();
|
|
self.renderTimer = null;
|
|
}, timeout);
|
|
}
|
|
},
|
|
|
|
appendText: function TextLayerBuilder_appendText(geom, styles) {
|
|
var style = styles[geom.fontName];
|
|
var textDiv = document.createElement('div');
|
|
this.textDivs.push(textDiv);
|
|
if (isAllWhitespace(geom.str)) {
|
|
textDiv.dataset.isWhitespace = true;
|
|
return;
|
|
}
|
|
var tx = PDFJS.Util.transform(this.viewport.transform, geom.transform);
|
|
var angle = Math.atan2(tx[1], tx[0]);
|
|
if (style.vertical) {
|
|
angle += Math.PI / 2;
|
|
}
|
|
var fontHeight = Math.sqrt((tx[2] * tx[2]) + (tx[3] * tx[3]));
|
|
var fontAscent = fontHeight;
|
|
if (style.ascent) {
|
|
fontAscent = style.ascent * fontAscent;
|
|
} else if (style.descent) {
|
|
fontAscent = (1 + style.descent) * fontAscent;
|
|
}
|
|
|
|
var left;
|
|
var top;
|
|
if (angle === 0) {
|
|
left = tx[4];
|
|
top = tx[5] - fontAscent;
|
|
} else {
|
|
left = tx[4] + (fontAscent * Math.sin(angle));
|
|
top = tx[5] - (fontAscent * Math.cos(angle));
|
|
}
|
|
textDiv.style.left = left + 'px';
|
|
textDiv.style.top = top + 'px';
|
|
textDiv.style.fontSize = fontHeight + 'px';
|
|
textDiv.style.fontFamily = style.fontFamily;
|
|
|
|
textDiv.textContent = geom.str;
|
|
// |fontName| is only used by the Font Inspector. This test will succeed
|
|
// when e.g. the Font Inspector is off but the Stepper is on, but it's
|
|
// not worth the effort to do a more accurate test.
|
|
if (PDFJS.pdfBug) {
|
|
textDiv.dataset.fontName = geom.fontName;
|
|
}
|
|
// Storing into dataset will convert number into string.
|
|
if (angle !== 0) {
|
|
textDiv.dataset.angle = angle * (180 / Math.PI);
|
|
}
|
|
// We don't bother scaling single-char text divs, because it has very
|
|
// little effect on text highlighting. This makes scrolling on docs with
|
|
// lots of such divs a lot faster.
|
|
if (textDiv.textContent.length > 1) {
|
|
if (style.vertical) {
|
|
textDiv.dataset.canvasWidth = geom.height * this.viewport.scale;
|
|
} else {
|
|
textDiv.dataset.canvasWidth = geom.width * this.viewport.scale;
|
|
}
|
|
}
|
|
},
|
|
|
|
setTextContent: function TextLayerBuilder_setTextContent(textContent) {
|
|
this.textContent = textContent;
|
|
|
|
var textItems = textContent.items;
|
|
for (var i = 0, len = textItems.length; i < len; i++) {
|
|
this.appendText(textItems[i], textContent.styles);
|
|
}
|
|
this.divContentDone = true;
|
|
},
|
|
|
|
convertMatches: function TextLayerBuilder_convertMatches(matches) {
|
|
var i = 0;
|
|
var iIndex = 0;
|
|
var bidiTexts = this.textContent.items;
|
|
var end = bidiTexts.length - 1;
|
|
var queryLen = (this.findController === null ?
|
|
0 : this.findController.state.query.length);
|
|
var ret = [];
|
|
|
|
for (var m = 0, len = matches.length; m < len; m++) {
|
|
// Calculate the start position.
|
|
var matchIdx = matches[m];
|
|
|
|
// Loop over the divIdxs.
|
|
while (i !== end && matchIdx >= (iIndex + bidiTexts[i].str.length)) {
|
|
iIndex += bidiTexts[i].str.length;
|
|
i++;
|
|
}
|
|
|
|
if (i === bidiTexts.length) {
|
|
console.error('Could not find a matching mapping');
|
|
}
|
|
|
|
var match = {
|
|
begin: {
|
|
divIdx: i,
|
|
offset: matchIdx - iIndex
|
|
}
|
|
};
|
|
|
|
// Calculate the end position.
|
|
matchIdx += queryLen;
|
|
|
|
// Somewhat the same array as above, but use > instead of >= to get
|
|
// the end position right.
|
|
while (i !== end && matchIdx > (iIndex + bidiTexts[i].str.length)) {
|
|
iIndex += bidiTexts[i].str.length;
|
|
i++;
|
|
}
|
|
|
|
match.end = {
|
|
divIdx: i,
|
|
offset: matchIdx - iIndex
|
|
};
|
|
ret.push(match);
|
|
}
|
|
|
|
return ret;
|
|
},
|
|
|
|
renderMatches: function TextLayerBuilder_renderMatches(matches) {
|
|
// Early exit if there is nothing to render.
|
|
if (matches.length === 0) {
|
|
return;
|
|
}
|
|
|
|
var bidiTexts = this.textContent.items;
|
|
var textDivs = this.textDivs;
|
|
var prevEnd = null;
|
|
var pageIdx = this.pageIdx;
|
|
var isSelectedPage = (this.findController === null ?
|
|
false : (pageIdx === this.findController.selected.pageIdx));
|
|
var selectedMatchIdx = (this.findController === null ?
|
|
-1 : this.findController.selected.matchIdx);
|
|
var highlightAll = (this.findController === null ?
|
|
false : this.findController.state.highlightAll);
|
|
var infinity = {
|
|
divIdx: -1,
|
|
offset: undefined
|
|
};
|
|
|
|
function beginText(begin, className) {
|
|
var divIdx = begin.divIdx;
|
|
textDivs[divIdx].textContent = '';
|
|
appendTextToDiv(divIdx, 0, begin.offset, className);
|
|
}
|
|
|
|
function appendTextToDiv(divIdx, fromOffset, toOffset, className) {
|
|
var div = textDivs[divIdx];
|
|
var content = bidiTexts[divIdx].str.substring(fromOffset, toOffset);
|
|
var node = document.createTextNode(content);
|
|
if (className) {
|
|
var span = document.createElement('span');
|
|
span.className = className;
|
|
span.appendChild(node);
|
|
div.appendChild(span);
|
|
return;
|
|
}
|
|
div.appendChild(node);
|
|
}
|
|
|
|
var i0 = selectedMatchIdx, i1 = i0 + 1;
|
|
if (highlightAll) {
|
|
i0 = 0;
|
|
i1 = matches.length;
|
|
} else if (!isSelectedPage) {
|
|
// Not highlighting all and this isn't the selected page, so do nothing.
|
|
return;
|
|
}
|
|
|
|
for (var i = i0; i < i1; i++) {
|
|
var match = matches[i];
|
|
var begin = match.begin;
|
|
var end = match.end;
|
|
var isSelected = (isSelectedPage && i === selectedMatchIdx);
|
|
var highlightSuffix = (isSelected ? ' selected' : '');
|
|
|
|
if (this.findController) {
|
|
this.findController.updateMatchPosition(pageIdx, i, textDivs,
|
|
begin.divIdx, end.divIdx);
|
|
}
|
|
|
|
// Match inside new div.
|
|
if (!prevEnd || begin.divIdx !== prevEnd.divIdx) {
|
|
// If there was a previous div, then add the text at the end.
|
|
if (prevEnd !== null) {
|
|
appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);
|
|
}
|
|
// Clear the divs and set the content until the starting point.
|
|
beginText(begin);
|
|
} else {
|
|
appendTextToDiv(prevEnd.divIdx, prevEnd.offset, begin.offset);
|
|
}
|
|
|
|
if (begin.divIdx === end.divIdx) {
|
|
appendTextToDiv(begin.divIdx, begin.offset, end.offset,
|
|
'highlight' + highlightSuffix);
|
|
} else {
|
|
appendTextToDiv(begin.divIdx, begin.offset, infinity.offset,
|
|
'highlight begin' + highlightSuffix);
|
|
for (var n0 = begin.divIdx + 1, n1 = end.divIdx; n0 < n1; n0++) {
|
|
textDivs[n0].className = 'highlight middle' + highlightSuffix;
|
|
}
|
|
beginText(end, 'highlight end' + highlightSuffix);
|
|
}
|
|
prevEnd = end;
|
|
}
|
|
|
|
if (prevEnd) {
|
|
appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);
|
|
}
|
|
},
|
|
|
|
updateMatches: function TextLayerBuilder_updateMatches() {
|
|
// Only show matches when all rendering is done.
|
|
if (!this.renderingDone) {
|
|
return;
|
|
}
|
|
|
|
// Clear all matches.
|
|
var matches = this.matches;
|
|
var textDivs = this.textDivs;
|
|
var bidiTexts = this.textContent.items;
|
|
var clearedUntilDivIdx = -1;
|
|
|
|
// Clear all current matches.
|
|
for (var i = 0, len = matches.length; i < len; i++) {
|
|
var match = matches[i];
|
|
var begin = Math.max(clearedUntilDivIdx, match.begin.divIdx);
|
|
for (var n = begin, end = match.end.divIdx; n <= end; n++) {
|
|
var div = textDivs[n];
|
|
div.textContent = bidiTexts[n].str;
|
|
div.className = '';
|
|
}
|
|
clearedUntilDivIdx = match.end.divIdx + 1;
|
|
}
|
|
|
|
if (this.findController === null || !this.findController.active) {
|
|
return;
|
|
}
|
|
|
|
// Convert the matches on the page controller into the match format
|
|
// used for the textLayer.
|
|
this.matches = this.convertMatches(this.findController === null ?
|
|
[] : (this.findController.pageMatches[this.pageIdx] || []));
|
|
this.renderMatches(this.matches);
|
|
}
|
|
};
|
|
return TextLayerBuilder;
|
|
})();
|
|
|
|
/**
|
|
* @constructor
|
|
* @implements IPDFTextLayerFactory
|
|
*/
|
|
function DefaultTextLayerFactory() {}
|
|
DefaultTextLayerFactory.prototype = {
|
|
/**
|
|
* @param {HTMLDivElement} textLayerDiv
|
|
* @param {number} pageIndex
|
|
* @param {PageViewport} viewport
|
|
* @returns {TextLayerBuilder}
|
|
*/
|
|
createTextLayerBuilder: function (textLayerDiv, pageIndex, viewport) {
|
|
return new TextLayerBuilder({
|
|
textLayerDiv: textLayerDiv,
|
|
pageIndex: pageIndex,
|
|
viewport: viewport
|
|
});
|
|
}
|
|
};
|