Continuous PDF Viewer

Thanks to Imran Siddiq (https://www.youtube.com/@websquadron/). This code was adapted from his PDF Viewer code. Continuous PDF Viewer is a high-performance, WordPress-native PDF viewer powered by PDF.js. Version 2.1 introduces a completely rebuilt rendering engine optimized for 100% continuous scrolling, bringing a modern, native-app reading experience to your WordPress site. Key Features

• Continuous Scroll Engine: Pages stack seamlessly for smooth, vertical reading. Highly optimized sequential rendering prevents browser lag, even on large documents.
• Smart Page Tracking: An intelligent viewport observer automatically detects which page you are reading and instantly updates the toolbar and sidebar thumbnails as you scroll.
• Advanced Search & Highlight: Pinpoint search functionality that calculates the exact pixel location of your search terms and smoothly scrolls them directly into the center of your screen.
• Native Fullscreen Mode: Utilizes the browser's native Fullscreen API for distraction-free reading, featuring "scroll memory" to keep your place when entering or exiting fullscreen.
• Gutenberg Block Integration: A native WordPress block with a click-to-select placeholder UI and seamless Media Library integration.
• Live Shortcode Generator: A dedicated admin tools page (Tools > Continuous PDF Viewer) that lets you visually configure colors, dimensions, and toolbar features while generating a live shortcode.

Using the Gutenberg Block

1. Open the WordPress Block Editor.
2. Search for the "Continuous PDF Viewer" block.
3. Click "Select PDF File" on the canvas to choose a document from your Media Library.
4. Use the right-hand Inspector Controls to customize the start page, default zoom, sidebar visibility, and colors.

Using the Shortcode You can place the viewer anywhere using the [continuous_pdf_viewer] shortcode. Basic Example: [continuous_pdf_viewer url="https://yoursite.com/wp-content/uploads/document.pdf"] Advanced Example: [continuous_pdf_viewer url="/wp-content/uploads/document.pdf" title="Annual Report" start_page="3" theme="dark" accent="#4f7df3"] Note: Generating complex shortcodes is highly recommended via the built-in Shortcode Generator under the Tools menu.

2.1.7

• Put the "Pro Tip" on a separate line to make the toolbar more responsive

2.1.6

• Fix the scale number in the toolbar so it matches the actual zoom level

2.1.5

• Removed the standard_fonts folder

2.1.4

• Change prefix used in the code from cpv to cpdfv
• removed unused files
• moved inline CSS/JS to use of wp_add_inline_*
• changed shortcode name to continuous_pdf_viewer

2.1.3

• switch to latest version of PDF.js (v5.6.205)
• removed an extra file that didn't belong
• removed some !important from the CSS and add a tooltip to the PDF viewer panel
• fixed some issues with going full screen
• hide the thumbnail button on mobile
• hide the sidebar when going fullscreen
• make the tool tip text into a PDF Viewer setting which can be changed by the user

2.1.1

• Changed the default height from 600px to 80vh
• Recalculate the width for each tab when in a page when different pdf viewer blocks are in different tabs.`
• Set the default heights to 80vh for desktop, 70vh for tablet, and 60vh for mobile rather than a specific px value.
• wrapped some output in escape_* functions

2.1.0

• New: Highly-optimized Continuous Scroll engine replaces the legacy single-page view.
• New: Pressing the Enter key inside the search bar now accurately loops through highlighted results.
• New: High-DPI (Retina) screen support added to the canvas rendering loop for crystal-clear text.
• Fix: Replaced legacy CSS flexbox centering to eliminate the "cut-off top" bug on tall pages.
• Tweak: Search navigation buttons now visually disable when reaching the first or last search result.
• Deprecated: The legacy view_mode setting (Single Page vs. Continuous) has been removed.