This snippet allows users to click and drag to flip for TNC FlipBook: https://codecanyon.net/item/pdf-viewer-for-wordpress/8182815

drag-flip-tnc-flipbook.php

/**
 * This function allows users to click and drag anywhere to flip
 * Specifically for TNC FlipBook: https://codecanyon.net/item/pdf-viewer-for-wordpress/8182815
 * Put this code in your active theme's functions.php file
 *
 * @return void
 */
function tnc_pvfw_support_allow_drag_flip_anywhere() {
    ?>
    <script>
    var startX;
    var isDragging = false;

    jQuery('#viewer').on('mousedown touchstart', function(event) {
        isDragging = true;
        startX = event.type === 'touchstart' ? event.originalEvent.touches[0].pageX : event.pageX;
    });

    jQuery('#viewer').on('mousemove touchmove', function(event) {
        if (isDragging) {
            var currentX = event.type === 'touchmove' ? event.originalEvent.touches[0].pageX : event.pageX;
            var deltaX = currentX - startX;

            if (Math.abs(deltaX) > 50) { // Adjust threshold as needed
                if (deltaX > 0) {
                    jQuery('#viewer').turn('previous');
                } else {
                    jQuery('#viewer').turn('next');
                }
                isDragging = false;
            }
        }
    });

    jQuery(document).on('mouseup touchend', function() {
        isDragging = false;
    });
    </script>
    <?php
}
add_action('tnc_pvfw_footer', 'tnc_pvfw_support_allow_drag_flip_anywhere');