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Edit File: class-image-select-control.php

<?php
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * Class to create a control to set the color of an element.
 *
 * @since 1.0.0
 */
class Themify_Image_Select_Control extends Themify_Control {

/**
	 * Type of this control.
	 * @access public
	 * @var string
	 */
	public $type = 'themify_image_select';

/**
	 * Render the control's content.
	 *
	 * @since 1.0.0
	 */
	public function render_content() {
		$v = $this->value();
		$values = json_decode( $v );
		$current = isset( $values->selected ) ? $values->selected : 'default';
		wp_enqueue_script( 'json2' );
				$label = $this->show_label && ! empty( $this->label );
		?>

<?php if ( $label ) : ?>
			<span class="customize-control-title themify-control-title themify-suba-toggle"><?php echo esc_html( $this->label ); ?></span>
		<?php endif; ?>
				<?php if ($label) : ?>                    
					<ul class="themify-control-sub-accordeon">
						<li>            
				<?php endif;?>
					<div class="themify-customizer-brick">

<?php
							if ( isset( $this->image_options ) ) {
									foreach ( $this->image_options as $option => $image ) {
											echo '<a href="#" data-option="' . esc_attr( $option ) . '" class="image-select ' . $this->selected( $option, $current ) . '">';
													echo '<img src="' . esc_url( $image ) . '" />';
											echo '</a>';
									}
							}
							?>

</div>

<input <?php $this->link(); ?> value='<?php echo esc_attr( $v ); ?>' type="hidden" class="<?php echo esc_attr( $this->type ); ?>_control themify-customizer-value-field"/>
				<?php if ($label) : ?>
						</li>
					</ul>
				<?php endif;?>
		<?php
	}

function selected( $option, $current ) {
		return $option == $current ? 'selected' : '';
	}
}

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