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✏️ Editing: vc-btn.php

<?php
if ( ! defined( 'ABSPATH' ) ) {
	die( '-1' );
}

/**
 * WPBakery WPBakery Page Builder shortcodes
 *
 * @package WPBakeryPageBuilder
 *
 */

/**
 * Class WPBakeryShortCode_VC_Btn
 * @since 4.5
 */
class WPBakeryShortCode_VC_Btn extends WPBakeryShortCode {

public static function convertAttributesToButton3( $atts ) {
		//size btn1 to size btn2
		$btn1_sizes = array( 'wpb_regularsize', 'btn-large', 'btn-small', 'btn-mini' );
		if ( isset( $atts['size'] ) && in_array( $atts['size'], $btn1_sizes ) ) {
			$atts['size'] = str_replace( $btn1_sizes, array( 'md', 'lg', 'sm', 'xs' ), $atts['size'] );
		}

// Convert Btn1 href+target attributes to Btn2 `link` attribute
		if ( ! isset( $atts['link'] ) && isset( $atts['href'] ) && strlen( $atts['href'] ) > 0 ) {
			$link = $atts['href'];
			$target = isset( $atts['target'] ) ? $atts['target'] : ''; // if empty => same as `_self`
			$title = isset( $atts['title'] ) ? $atts['title'] : $link;
			$atts['link'] = 'url:' . rawurlencode( $link ) . '|title:' . $title . ( strlen( $target ) > 0 ? '|target:' . rawurlencode( $target ) : '' );
		}
		/*
		__( 'Classic Grey', 'js_composer' ) => 'wpb_button',
        __( 'Classic Blue', 'js_composer' ) => 'btn-primary',
        __( 'Classic Turquoise', 'js_composer' ) => 'btn-info',
        __( 'Classic Green', 'js_composer' ) => 'btn-success',
        __( 'Classic Orange', 'js_composer' ) => 'btn-warning',
        __( 'Classic Red', 'js_composer' ) => 'btn-danger',
        __( 'Classic Black', 'js_composer' ) => "btn-inverse"
		*/

if ( ( ! isset( $atts['add_icon'] ) || 'true' != $atts['add_icon'] ) && isset( $atts['icon'] ) && strlen( $atts['icon'] ) > 0 && 'none' != $atts['icon'] ) {
			// old icon from btn1 is set, let's convert it to new btn
			$atts['add_icon'] = 'true';
			$atts['icon_type'] = 'pixelicons';
			$atts['icon_align'] = 'right';
			$atts['icon_pixelicons'] = 'vc_pixel_icon vc_pixel_icon-' . str_replace( 'wpb_', '', $atts['icon'] );
		}
		if ( isset( $atts['style'] ) && in_array( $atts['style'], array(
				'rounded',
				'square',
				'round',
				'outlined',
				'square_outlined',
			) )
		) {
			switch ( $atts['style'] ) {
				case 'rounded':
					$atts['style'] = 'flat';
					$atts['shape'] = 'rounded';
					break;
				case 'square':
					$atts['style'] = 'flat';
					$atts['shape'] = 'square';
					break;
				case 'round':
					$atts['style'] = 'flat';
					$atts['shape'] = 'round';
					break;
				case 'outlined':
					$atts['style'] = 'outline';
					break;
				case 'square_outlined':
					$atts['style'] = 'outline';
					$atts['shape'] = 'square';
					break;
			}
		}

return $atts;
	}

/**
	 * @param $title
	 *
	 * @since 4.5
	 * @return string
	 */
	protected function outputTitle( $title ) {
		$icon = $this->settings( 'icon' );

return '<h4 class="wpb_element_title"><span class="vc_general vc_element-icon vc_btn3-icon' . ( ! empty( $icon ) ? ' ' . $icon : '' ) . '"></span></h4>';
	}
}

MR SKB