Epub阅读器0.0.1
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shen
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(function() {
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if (window.RDReaderBridge) { return; }
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window.addEventListener('error', function(event) {
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try {
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var message = event && (event.message || (event.error && event.error.message)) || 'Unknown JavaScript error';
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window.webkit.messageHandlers.{{JAVASCRIPT_ERROR_MESSAGE}}.postMessage(message);
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} catch (error) {
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}
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});
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function nodePath(node) {
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var path = [];
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var current = node;
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while (current && current !== document) {
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var parent = current.parentNode;
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if (!parent) { break; }
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var index = Array.prototype.indexOf.call(parent.childNodes, current);
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path.unshift(index);
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current = parent;
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}
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return path;
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}
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function nodeFromPath(path) {
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var current = document;
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for (var i = 0; i < path.length; i += 1) {
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if (!current || !current.childNodes || current.childNodes.length <= path[i]) { return null; }
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current = current.childNodes[path[i]];
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}
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return current;
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}
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function serializeRange(range) {
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return JSON.stringify({
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kind: 'dom-range',
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startPath: nodePath(range.startContainer),
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startOffset: range.startOffset,
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endPath: nodePath(range.endContainer),
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endOffset: range.endOffset
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});
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}
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function rangeFromInfo(rangeInfo) {
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try {
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var payload = typeof rangeInfo === 'string' ? JSON.parse(rangeInfo) : rangeInfo;
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var startNode = nodeFromPath(payload.startPath || []);
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var endNode = nodeFromPath(payload.endPath || []);
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if (!startNode || !endNode) { return null; }
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var range = document.createRange();
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range.setStart(startNode, payload.startOffset || 0);
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range.setEnd(endNode, payload.endOffset || 0);
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return range;
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} catch (error) {
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return null;
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}
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}
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var visiblePageIndex = 0;
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var configuredPageCount = 1;
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var configuredPageStride = 1;
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var relayoutTimer = null;
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var fixedLayoutDocument = false;
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function isFixedLayoutDocument() {
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if (fixedLayoutDocument) { return true; }
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fixedLayoutDocument = !!document.getElementById('ss-fixed-root') || !!document.querySelector('.ss-fixed-page');
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return fixedLayoutDocument;
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}
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function ensurePaginationStructure() {
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if (isFixedLayoutDocument()) {
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return null;
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}
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var viewport = document.getElementById('ss-reader-viewport');
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var content = document.getElementById('ss-reader-content');
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if (viewport && content) {
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return content;
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}
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viewport = document.createElement('div');
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viewport.id = 'ss-reader-viewport';
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content = document.createElement('div');
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content.id = 'ss-reader-content';
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while (document.body.firstChild) {
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content.appendChild(document.body.firstChild);
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}
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viewport.appendChild(content);
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document.body.appendChild(viewport);
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return content;
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}
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function paginationContent() {
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if (isFixedLayoutDocument()) {
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return null;
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}
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return ensurePaginationStructure();
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}
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function effectivePageStride() {
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return Math.max(1, configuredPageStride || 1);
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}
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function measuredPageCount() {
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if (isFixedLayoutDocument()) {
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return 1;
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}
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var content = paginationContent();
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var scrollingElement = document.scrollingElement || document.documentElement || document.body;
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var scrollWidth = Math.max(
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content ? content.scrollWidth : 0,
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content ? content.offsetWidth : 0,
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scrollingElement ? scrollingElement.scrollWidth : 0,
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document.documentElement ? document.documentElement.scrollWidth : 0,
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document.body ? document.body.scrollWidth : 0,
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effectivePageStride()
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);
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return Math.max(1, Math.ceil(scrollWidth / effectivePageStride()));
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}
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function totalPageCount() {
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return Math.max(configuredPageCount, measuredPageCount());
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}
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function currentPageOffset() {
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return Math.round(visiblePageIndex * effectivePageStride());
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}
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function reportProgression(fragment) {
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var pageCount = totalPageCount();
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var progression = pageCount <= 1 ? 0 : visiblePageIndex / Math.max(pageCount - 1, 1);
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var lastProgression = progression;
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window.webkit.messageHandlers.{{PROGRESSION_CHANGED_MESSAGE}}.postMessage({
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progression: progression,
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lastProgression: lastProgression,
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fragment: fragment || null
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});
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}
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function setVisiblePageIndex(pageIndex) {
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if (isFixedLayoutDocument()) {
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visiblePageIndex = 0;
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return;
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}
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var pageCount = totalPageCount();
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var maxPageIndex = Math.max(0, pageCount - 1);
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var safePageIndex = Math.max(0, Math.min(maxPageIndex, Math.round(pageIndex || 0)));
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visiblePageIndex = safePageIndex;
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var content = paginationContent();
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if (content) {
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content.style.transform = 'translate3d(' + (-currentPageOffset()) + 'px, 0, 0)';
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}
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}
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function scheduleRelayout() {
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if (isFixedLayoutDocument()) { return; }
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clearTimeout(relayoutTimer);
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relayoutTimer = setTimeout(function() {
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setVisiblePageIndex(visiblePageIndex);
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reportProgression(null);
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}, 60);
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}
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function pageIndexForElement(target) {
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if (isFixedLayoutDocument()) { return 0; }
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if (!target) { return 0; }
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var rect = target.getBoundingClientRect();
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var absoluteLeft = Math.max(0, rect.left + currentPageOffset());
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return Math.max(0, Math.floor(absoluteLeft / effectivePageStride()));
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}
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function unwrapHighlights() {
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document.querySelectorAll('mark.ss-reader-highlight').forEach(function(mark) {
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var parent = mark.parentNode;
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if (!parent) { return; }
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while (mark.firstChild) {
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parent.insertBefore(mark.firstChild, mark);
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}
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parent.removeChild(mark);
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});
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}
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function setHighlights(items) {
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unwrapHighlights();
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if (!Array.isArray(items)) { return; }
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items.forEach(function(item) {
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if (!item || !item.rangeInfo) { return; }
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var range = rangeFromInfo(item.rangeInfo);
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if (!range || range.collapsed) { return; }
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try {
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var mark = document.createElement('mark');
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var style = item.style || 'highlight';
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mark.className = 'ss-reader-highlight ss-reader-highlight-' + style;
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mark.style.color = 'inherit';
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if (style === 'underline') {
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mark.style.background = 'transparent';
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mark.style.textDecorationColor = item.color || '#F8E16C';
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} else {
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mark.style.background = item.color || '#F8E16C';
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}
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mark.dataset.highlightId = item.id || '';
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range.surroundContents(mark);
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} catch (error) {
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}
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});
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}
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function selectionPayload() {
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var selection = window.getSelection();
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if (!selection || selection.rangeCount === 0 || selection.isCollapsed) {
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return null;
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}
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var range = selection.getRangeAt(0);
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var text = selection.toString();
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if (!text || !text.trim()) { return null; }
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var pageCount = totalPageCount();
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var progression = pageCount <= 1 ? 0 : visiblePageIndex / Math.max(pageCount - 1, 1);
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var lastProgression = progression;
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return {
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text: text,
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rangeInfo: serializeRange(range),
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progression: progression,
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lastProgression: lastProgression
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};
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}
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var selectionTimer = null;
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document.addEventListener('selectionchange', function() {
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clearTimeout(selectionTimer);
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selectionTimer = setTimeout(function() {
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var payload = selectionPayload();
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window.webkit.messageHandlers.{{SELECTION_CHANGED_MESSAGE}}.postMessage(payload);
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}, 120);
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});
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window.addEventListener('resize', function() {
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if (isFixedLayoutDocument()) { return; }
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setVisiblePageIndex(visiblePageIndex);
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reportProgression(null);
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}, { passive: true });
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window.addEventListener('load', scheduleRelayout, { passive: true });
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if (!isFixedLayoutDocument() && document.fonts && document.fonts.ready) {
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document.fonts.ready.then(scheduleRelayout).catch(function() {});
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}
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if (!isFixedLayoutDocument()) {
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Array.prototype.forEach.call(document.querySelectorAll('img, iframe, video'), function(node) {
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node.addEventListener('load', scheduleRelayout, { passive: true });
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node.addEventListener('error', scheduleRelayout, { passive: true });
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});
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}
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document.addEventListener('click', function(event) {
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var anchor = event.target.closest ? event.target.closest('a[href]') : null;
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if (!anchor) { return; }
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var href = anchor.getAttribute('href');
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if (!href) { return; }
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if (/^(https?:|mailto:|tel:)/i.test(href)) {
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event.preventDefault();
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window.webkit.messageHandlers.{{EXTERNAL_LINK_MESSAGE}}.postMessage({ url: href });
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return;
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}
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event.preventDefault();
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window.webkit.messageHandlers.{{INTERNAL_LINK_MESSAGE}}.postMessage({ href: href });
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}, true);
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window.RDReaderBridge = {
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applyPagination: function(styleText) {
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if (isFixedLayoutDocument()) { return; }
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var style = document.getElementById('ss-reader-pagination');
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if (!style) {
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style = document.createElement('style');
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style.id = 'ss-reader-pagination';
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document.head.appendChild(style);
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}
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style.textContent = styleText;
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ensurePaginationStructure();
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},
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setPageMetrics: function(pageCount, pageStride) {
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if (isFixedLayoutDocument()) { return; }
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configuredPageCount = Math.max(1, Math.round(pageCount || 1));
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configuredPageStride = Math.max(1, Number(pageStride) || configuredPageStride || 1);
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setVisiblePageIndex(visiblePageIndex);
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scheduleRelayout();
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},
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scrollToPage: function(pageIndex) {
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if (isFixedLayoutDocument()) { return; }
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setVisiblePageIndex(pageIndex);
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reportProgression(null);
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},
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scrollToLocation: function(location, fallbackPageIndex) {
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if (location && location.fragment) {
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var target = document.getElementById(location.fragment) || document.querySelector('[name="' + location.fragment.replace(/"/g, '\\"') + '"]');
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if (target) {
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setVisiblePageIndex(pageIndexForElement(target));
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reportProgression(location.fragment);
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return;
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}
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}
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var pageCount = totalPageCount();
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var progression = location && typeof location.progression === 'number' ? location.progression : 0;
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var derivedPageIndex = progression > 0 && pageCount > 1
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? Math.round(progression * Math.max(pageCount - 1, 0))
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: (fallbackPageIndex || 0);
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this.scrollToPage(derivedPageIndex);
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},
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setHighlights: setHighlights,
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clearHighlights: unwrapHighlights,
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reportProgression: reportProgression,
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selectionPayload: selectionPayload
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};
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})();
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