feat: iframe-based PagedJS preview with reactive CSS editor
- Isolate PagedJS in iframe to avoid DOM/CSS conflicts - Add EditorPanel for global CSS controls - Add StylesheetViewer with highlight.js syntax highlighting - Add ElementPopup for element-specific CSS editing - CSS modifications update preview reactively - Support px/rem/em units 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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9 changed files with 541 additions and 109 deletions
283
src/App.vue
283
src/App.vue
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<script setup>
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import PagedJsWrapper from './components/PagedJsWrapper.vue';
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import { onMounted, ref, nextTick } from 'vue';
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import { Previewer } from 'pagedjs';
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import EditorPanel from './components/EditorPanel.vue';
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import StylesheetViewer from './components/StylesheetViewer.vue';
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import ElementPopup from './components/ElementPopup.vue';
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import { onMounted, ref, watch } from 'vue';
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const marginTop = ref(20);
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let sourceHTML = '';
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let editorUIElement = null;
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// Main state
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const previewFrame = ref(null);
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const stylesheetContent = ref('');
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const aboutFontSize = ref(2);
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const aboutFontSizeUnit = ref('rem');
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const renderPaged = async () => {
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console.log('renderPaged called, marginTop:', marginTop.value);
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// Popup state
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const popupVisible = ref(false);
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const popupPosition = ref({ x: 0, y: 0 });
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const popupSelector = ref('');
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const popupElementCss = ref('');
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const popupFontSize = ref(null);
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const popupFontSizeUnit = ref('rem');
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// Update @page margin dynamically
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let styleEl = document.getElementById('dynamic-page-style');
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if (!styleEl) {
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styleEl = document.createElement('style');
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styleEl.id = 'dynamic-page-style';
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document.head.appendChild(styleEl);
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}
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styleEl.textContent = `
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@page {
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size: A4;
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margin: ${marginTop.value}mm 15mm 26mm 15mm;
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}
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`;
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// PagedJS print rules
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const printStyles = `
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h2 { break-before: page; }
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// Detach UI before PagedJS processes body
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if (editorUIElement && editorUIElement.parentNode) {
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editorUIElement.remove();
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}
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// Remove previous render
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const existingPages = document.querySelector('.pagedjs_pages');
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if (existingPages) existingPages.remove();
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// Restore source content to body
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const printSource = document.getElementById('print-source');
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if (printSource && sourceHTML) {
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printSource.innerHTML = sourceHTML;
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printSource.style.display = 'block';
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}
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// Render
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const paged = new Previewer();
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try {
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const flow = await paged.preview();
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console.log('Rendered', flow.total, 'pages.');
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} catch (e) {
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console.error('PagedJS error:', e);
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}
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// Re-inject UI after PagedJS transforms the DOM
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if (editorUIElement) {
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document.body.appendChild(editorUIElement);
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// Apply styles inline since PagedJS removes stylesheets
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editorUIElement.style.cssText = `
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position: fixed !important;
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bottom: 1rem !important;
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left: 1rem !important;
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z-index: 9999 !important;
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background: white;
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padding: 0.5rem;
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border-radius: 4px;
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box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
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`;
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}
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};
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const increaseMargin = () => {
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marginTop.value += 5;
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console.log('Button clicked, new margin:', marginTop.value);
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renderPaged();
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};
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onMounted(async () => {
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await nextTick();
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// Store source HTML before first render
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const source = document.getElementById('print-source');
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if (source) {
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sourceHTML = source.innerHTML;
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console.log('Source HTML stored:', sourceHTML.substring(0, 100));
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}
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// Store UI element reference
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editorUIElement = document.getElementById('editor-ui');
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renderPaged();
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});
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</script>
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<template>
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<!-- Source content -->
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<div id="print-source">
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<PagedJsWrapper />
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</div>
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<!-- Editor UI overlay -->
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<div id="editor-ui">
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<button id="increase-margin" @click="increaseMargin">+</button>
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</div>
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</template>
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<style>
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/* PagedJS print styles */
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h2 {
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break-before: page;
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@page {
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size: A4;
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margin: 20mm 15mm 26mm 15mm;
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}
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@page {
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@bottom-center {
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content: string(title);
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}
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@bottom-center { content: string(title); }
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}
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.chapter > h2 {
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string-set: title content(text);
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.chapter > h2 { string-set: title content(text); }
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`;
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// CSS parsing utilities
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const extractCssBlock = (css, selector) => {
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const escaped = selector.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
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const match = css.match(new RegExp(`${escaped}\\s*{[^}]*}`, 'gi'));
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return match ? match[0] : '';
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};
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const extractCssValue = (css, selector, property) => {
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const regex = new RegExp(`${selector}\\s*{[^}]*${property}:\\s*([\\d.]+)(px|rem|em)`, 'i');
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const match = css.match(regex);
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return match ? { value: parseFloat(match[1]), unit: match[2] } : null;
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};
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const updateCssValue = (selector, property, value, unit) => {
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const regex = new RegExp(`(${selector}\\s*{[^}]*${property}:\\s*)[\\d.]+(px|rem|em)`, 'gi');
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stylesheetContent.value = stylesheetContent.value.replace(regex, `$1${value}${unit}`);
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};
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// Iframe style injection
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const injectStylesToIframe = () => {
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const iframe = previewFrame.value;
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if (!iframe?.contentDocument) return;
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let styleElement = iframe.contentDocument.getElementById('dynamic-styles');
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if (!styleElement) {
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styleElement = iframe.contentDocument.createElement('style');
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styleElement.id = 'dynamic-styles';
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iframe.contentDocument.head.appendChild(styleElement);
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}
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styleElement.textContent = stylesheetContent.value;
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};
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// Popup handlers
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const handleIframeClick = (event) => {
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const element = event.target;
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if (element.tagName === 'BODY' || element.tagName === 'HTML') {
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popupVisible.value = false;
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return;
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}
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const selector = element.id
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? `#${element.id}`
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: `.${element.className.split(' ')[0]}`;
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popupSelector.value = selector;
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popupElementCss.value = extractCssBlock(stylesheetContent.value, selector);
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const fontSizeData = extractCssValue(stylesheetContent.value, selector, 'font-size');
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popupFontSize.value = fontSizeData?.value ?? null;
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popupFontSizeUnit.value = fontSizeData?.unit ?? 'rem';
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const rect = element.getBoundingClientRect();
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const iframeRect = previewFrame.value.getBoundingClientRect();
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popupPosition.value = {
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x: iframeRect.left + rect.left,
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y: iframeRect.top + rect.bottom + 5
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};
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popupVisible.value = true;
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};
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const closePopup = () => {
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popupVisible.value = false;
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};
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const updatePopupFontSize = (newValue) => {
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updateCssValue(popupSelector.value, 'font-size', newValue, popupFontSizeUnit.value);
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popupFontSize.value = newValue;
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popupElementCss.value = extractCssBlock(stylesheetContent.value, popupSelector.value);
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};
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// Watchers
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watch(aboutFontSize, (newVal) => {
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updateCssValue('.about', 'font-size', newVal, aboutFontSizeUnit.value);
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});
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watch(stylesheetContent, injectStylesToIframe);
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// Initial render
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const renderPreview = async () => {
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const iframe = previewFrame.value;
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if (!iframe) return;
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const response = await fetch('/assets/css/stylesheet.css');
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stylesheetContent.value = await response.text();
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const initialFontSize = extractCssValue(stylesheetContent.value, '.about', 'font-size');
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if (initialFontSize) {
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aboutFontSize.value = initialFontSize.value;
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aboutFontSizeUnit.value = initialFontSize.unit;
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}
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const contentSource = document.getElementById('content-source');
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const iframeDoc = iframe.contentDocument;
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iframeDoc.open();
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iframeDoc.write(`
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<!DOCTYPE html>
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<html>
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<head>
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<link rel="stylesheet" href="/assets/css/pagedjs-interface.css">
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<style id="dynamic-styles">${stylesheetContent.value}</style>
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<style>${printStyles}</style>
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<script src="https://unpkg.com/pagedjs/dist/paged.polyfill.js"><\/script>
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</head>
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<body>${contentSource.innerHTML}</body>
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</html>
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`);
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iframeDoc.close();
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iframe.onload = () => {
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iframe.contentDocument.addEventListener('click', handleIframeClick);
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};
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};
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onMounted(renderPreview);
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</script>
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<template>
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<div id="content-source" style="display: none">
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<PagedJsWrapper />
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</div>
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<EditorPanel
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:fontSize="aboutFontSize"
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:unit="aboutFontSizeUnit"
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@update:fontSize="aboutFontSize = $event"
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/>
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<iframe ref="previewFrame" id="preview-frame"></iframe>
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<StylesheetViewer :stylesheet="stylesheetContent" />
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<ElementPopup
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:visible="popupVisible"
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:position="popupPosition"
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:selector="popupSelector"
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:elementCss="popupElementCss"
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:currentFontSize="popupFontSize"
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:fontSizeUnit="popupFontSizeUnit"
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@close="closePopup"
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@update:fontSize="updatePopupFontSize"
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/>
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</template>
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<style>
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#preview-frame {
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position: fixed;
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top: 0;
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left: 250px;
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width: calc(100% - 600px);
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height: 100vh;
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border: none;
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}
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</style>
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