Epub阅读器0.0.1
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shen
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<!doctype html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
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<style>
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html, body { margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background: {{BACKGROUND}}; }
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body { position: relative; }
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#ss-fixed-root {
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position: absolute;
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top: {{INSET_TOP}}px;
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right: {{INSET_RIGHT}}px;
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bottom: {{INSET_BOTTOM}}px;
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left: {{INSET_LEFT}}px;
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display: flex;
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flex-direction: row;
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align-items: stretch;
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justify-content: center;
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overflow: hidden;
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}
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.ss-fixed-viewport {
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position: relative;
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flex: 1 1 0;
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min-width: 0;
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min-height: 0;
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overflow: hidden;
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}
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.ss-fixed-page {
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position: absolute;
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top: 50%;
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width: 0;
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height: 0;
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border: 0;
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background: transparent;
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transform-origin: top left;
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}
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.ss-fixed-page[data-page-type="single"],
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.ss-fixed-page[data-page-type="center"] {
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left: 50%;
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transform: translate(-50%, -50%);
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}
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.ss-fixed-page[data-page-type="left"] {
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right: 0;
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transform: translateY(-50%);
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transform-origin: top right;
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}
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.ss-fixed-page[data-page-type="right"] {
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left: 0;
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transform: translateY(-50%);
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transform-origin: top left;
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}
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</style>
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</head>
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<body>
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<div id="ss-fixed-root">{{PANES}}</div>
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<script>
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(function() {
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var Fit = { AUTO: 'auto', PAGE: 'page', WIDTH: 'width' };
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var safeAreaInsets = { top: {{INSET_TOP}}, right: {{INSET_RIGHT}}, bottom: {{INSET_BOTTOM}}, left: {{INSET_LEFT}} };
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var viewportSize = { width: {{VIEWPORT_WIDTH}}, height: {{VIEWPORT_HEIGHT}} };
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var fit = '{{FIT_MODE}}';
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var pendingFrames = 0;
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var readySent = false;
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function notifyReady() {
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if (readySent) { return; }
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readySent = true;
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try {
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window.webkit.messageHandlers.{{FIXED_LAYOUT_READY_MESSAGE}}.postMessage({ loaded: true });
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} catch (error) {
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}
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}
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function parsePageSizeFromViewportMetaTag(iframe) {
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try {
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var viewport = iframe.contentWindow.document.querySelector('meta[name="viewport"]');
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if (!viewport) { return null; }
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var regex = /(\w+) *= *([^\s,]+)/g;
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var properties = {};
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var match;
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while ((match = regex.exec(viewport.content))) {
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properties[match[1]] = match[2];
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}
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var width = Number.parseFloat(properties.width);
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var height = Number.parseFloat(properties.height);
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if (!width || !height) { return null; }
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return { width: width, height: height };
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} catch (error) {
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return null;
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}
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}
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function parsePageSizeFromEmbeddedImage(iframe) {
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try {
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var img = iframe.contentWindow.document.querySelector('img');
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if (!img || !img.naturalWidth || !img.naturalHeight) { return null; }
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return { width: img.naturalWidth, height: img.naturalHeight };
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} catch (error) {
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return null;
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}
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}
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function pageViewportSize(iframe) {
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var viewport = iframe.closest('.ss-fixed-viewport');
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if (!viewport) { return viewportSize; }
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var width = Math.max(1, viewport.clientWidth);
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var height = Math.max(1, viewport.clientHeight);
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if (width <= 1 || height <= 1) {
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return viewportSize;
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}
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return {
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width: width,
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height: height
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};
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}
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function usesWidthFit(pageSize, localViewport) {
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if (fit === Fit.WIDTH) {
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return true;
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}
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if (fit !== Fit.AUTO) {
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return false;
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}
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var widthRatio = localViewport.width / pageSize.width;
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var heightRatio = localViewport.height / pageSize.height;
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return widthRatio <= heightRatio;
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}
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function layoutPage(iframe) {
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var pageSize = iframe.__ssPageSize;
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if (!pageSize) { return; }
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var pageType = iframe.dataset.pageType || 'single';
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var localViewport = pageViewportSize(iframe);
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iframe.style.width = pageSize.width + 'px';
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iframe.style.height = pageSize.height + 'px';
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var widthRatio = localViewport.width / pageSize.width;
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var heightRatio = localViewport.height / pageSize.height;
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var widthFit = usesWidthFit(pageSize, localViewport);
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var scale = widthFit ? widthRatio : Math.min(widthRatio, heightRatio);
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var scaledWidth = pageSize.width * scale;
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var scaledHeight = pageSize.height * scale;
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var offsetX, offsetY;
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if (pageType === 'left') {
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offsetX = localViewport.width - scaledWidth;
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} else if (pageType === 'right') {
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offsetX = 0;
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} else {
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offsetX = (localViewport.width - scaledWidth) / 2;
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}
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if (widthFit && scaledHeight > localViewport.height) {
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offsetY = safeAreaInsets.top;
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} else {
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offsetY = (localViewport.height - scaledHeight) / 2;
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offsetY += (safeAreaInsets.top - safeAreaInsets.bottom) / 2;
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}
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iframe.style.left = offsetX + 'px';
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iframe.style.top = offsetY + 'px';
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iframe.style.transform = 'scale(' + scale + ')';
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}
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function preparePage(iframe) {
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pendingFrames += 1;
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function finalizeLoad() {
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pendingFrames = Math.max(0, pendingFrames - 1);
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if (pendingFrames === 0) {
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notifyReady();
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}
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}
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function onLoad() {
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iframe.__ssPageSize =
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parsePageSizeFromViewportMetaTag(iframe) ||
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parsePageSizeFromEmbeddedImage(iframe) ||
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pageViewportSize(iframe);
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layoutPage(iframe);
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finalizeLoad();
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}
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iframe.addEventListener('load', function() {
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window.setTimeout(onLoad, 100);
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});
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iframe.addEventListener('error', function() {
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iframe.__ssPageSize = pageViewportSize(iframe);
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layoutPage(iframe);
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finalizeLoad();
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});
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}
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var pages = document.querySelectorAll('.ss-fixed-page');
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Array.prototype.forEach.call(pages, preparePage);
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if (pages.length === 0) {
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notifyReady();
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}
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window.addEventListener('resize', function() {
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Array.prototype.forEach.call(document.querySelectorAll('.ss-fixed-page'), layoutPage);
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});
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})();
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</script>
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</body>
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</html>
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