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Filename : widgets.php
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<?php

// Prevent direct file access
defined( 'LS_ROOT_FILE' ) || exit;

// Widget action
add_action( 'widgets_init', 'layerslider_register_widget' );

function layerslider_register_widget( ) {
	register_widget( 'LayerSlider_Widget' );
}

class LayerSlider_Widget extends WP_Widget {

	function __construct() {

		parent::__construct(
			'layerslider_widget',
			__('LayerSlider', 'LayerSlider'),
			[
				'classname' => 'layerslider_widget',
				'description' => __('Insert projects with the LayerSlider Widget', 'LayerSlider')
			],
			[
				'id_base' => 'layerslider_widget'
			]
		);
	}

	function widget( $args, $instance ) {

		extract($args);

		// Fix for Elementor:
		// Pre-save a default slider ID, so Elementor can immediately
		// render the widget with the latest slider (if any).
		if( empty( $instance['id'] ) ) {

			// Get latest slider
			$sliders = LS_Sliders::find( [ 'limit' => 1 ] );

			// Set latest slider (if any)
			if( ! empty( $sliders[0] ) ) {
				$instance['id'] = $sliders[0]['id'];
			}
		}

		$title = ! empty( $instance['title'] ) ? $instance['title'] : '';
		$title = apply_filters( 'widget_title', $title );
		$title = ! empty( $title ) ? $before_title . $title . $after_title : $title;

		echo $before_widget, $title, LS_Shortcode::handleShortcode($instance), $after_widget;
	}

	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;

		$instance['id'] = strip_tags( $new_instance['id'] );
		$instance['title'] = strip_tags( $new_instance['title'] );
		$instance['filters'] = strip_tags( $new_instance['filters'] );
		$instance['firstslide'] = strip_tags( $new_instance['firstslide'] );

		return $instance;
	}

	function form( $instance ) {

		$defaults = [
			'id' => '',
			'title' => '',
			'filters' => '',
			'firstslide' => ''
		];
		$instance = wp_parse_args( (array) $instance, $defaults );
		$sliders = LS_Sliders::find( [ 'limit' => 100 ] );
		?>

		<p>
			<label for="<?= $this->get_field_id( 'title' ); ?>"><?= __('Title:', 'LayerSlider'); ?></label>
			<input type="text" id="<?= $this->get_field_id( 'title' ); ?>" class="widefat" name="<?= $this->get_field_name( 'title' ); ?>" value="<?= $instance['title']; ?>">
		</p>
		<p>
			<label for="<?= $this->get_field_id( 'id' ); ?>"><?= __('Choose a project:', 'LayerSlider') ?></label><br>
			<?php if( ! empty( $sliders ) ) { ?>
			<select id="<?= $this->get_field_id( 'id' ); ?>" class="widefat" name="<?= $this->get_field_name( 'id' ); ?>">
				<?php foreach($sliders as $item) : ?>
				<?php $name = empty($item['name']) ? 'Unnamed' : htmlspecialchars($item['name']); ?>
				<?php if($item['id'] == $instance['id']) { ?>
				<option value="<?= $item['id'] ?>" selected="selected"><?= $name ?> | #<?= $item['id'] ?></option>
				<?php } else { ?>
				<option value="<?= $item['id'] ?>"><?= $name ?> | #<?= $item['id'] ?></option>
				<?php } ?>
				<?php endforeach; ?>
			</select>
			<?php } else { ?>
			<?= __('You haven’t created any project yet.', 'LayerSlider') ?>
			<?php } ?>
		</p>
		<p style="margin-top: 20px; padding-top: 10px; border-top: 1px dashed #dedede; margin-bottom: 20px;">
			<label for="<?= $this->get_field_id( 'filters' ); ?>"><?= __('Optional filters:', 'LayerSlider'); ?></label>
			<a href="https://layerslider.com/documentation/#publish-filters" target="_blank" style="float: right;"><?= __('Learn more', 'LayerSlider') ?></a>
			<input type="text" id="<?= $this->get_field_id( 'filters' ); ?>" placeholder="<?= __('e.g. homepage', 'LayerSlider') ?>" class="widefat" name="<?= $this->get_field_name( 'filters' ); ?>" value="<?= $instance['filters']; ?>">
		</p>
		<p>
			<label for="<?= $this->get_field_id( 'firstslide' ); ?>"><?= __('Override starting slide:', 'LayerSlider'); ?></label>
			<input type="text" id="<?= $this->get_field_id( 'firstslide' ); ?>" placeholder="<?= __('leave it empty to use default', 'LayerSlider') ?>" class="widefat" name="<?= $this->get_field_name( 'firstslide' ); ?>" value="<?= $instance['firstslide']; ?>">
		</p>
	<?php
	}
}
?>