Example: Adding custom settings to eForm Forms

<?php

class FSQM_Add_Custom_Settings {
	/**
	 * Reference to IPT_FSQM_Form_Elements_Admin object
	 * This is stored during settings filter
	 */
	public $that;

	/**
	 * Constructor
	 * It essentially adds all the necessary filters
	 */
	public function __construct() {
		// Add the filters
		add_filter( 'ipt_fsqm_filter_default_settings', array( $this, 'add_settings_variable' ), 10 );
		add_filter( 'ipt_fsqm_admin_tab_settings', array( $this, 'add_settings_admin_ui' ), 10, 2 );
	}

	/**
	 * Add our custom variables to the default FSQM settings
	 *
	 * @param      array   $settings  Associative array of settings
	 *
	 * @return     array
	 */
	public function add_settings_variable( $settings ) {
		// Let us add some variables to the default settings
		// For this demo we would add an associative array
		$settings['custom'] = array(
			'options' => array(
				'bool' => true,
				'singleop' => 'op1', // For radio input
				'multipleop' => array(), // Whenever adding checkbox related options, always add an empty array. This is just how FSQM backend works
				                         // You can look into IPT_FSQM_Form_Elements_Base::merge_elements and you'd understand why
			),
			'inputs' => array(
				'oneliner' => 'This is some text',
				'multiliner' => "This is some more\r\nWith multiple line",
			),
		);

		return $settings;
	}

	/**
	 * Filter settings tab variable to add our own tab
	 *
	 * @param      array   $tab_settings  Associative array of tab variables
	 * @param      object  $context       Reference to the calling IPT_FSQM_Form_Elements_Admin variable
	 *
	 * @return     array
	 */
	public function add_settings_admin_ui( $tab_settings, $context ) {
		// First we add a new tab
		// to provide UI in order to manage our settings variables
		$tab_settings[] = array(
			'id' => 'ipt_fsqm_form_custom', // HTML ID of the tab
			'label' => __( 'Custom Settings', 'domain' ), // Label of the tab
			'callback' => array( $this, 'settings_admin_ui_cb' ), // Callback function to populate TAB UI
			'has_inner_tab' => true, // If is has vertical tabs inside it
			                         // For this this demo, we say yes"
		);

		// Store the reference to the object
		$this->that = $context;

		return $tab_settings;
	}

	public function settings_admin_ui_cb() {
		// Now let us create two new horizontal tabs
		// Each one of them would edit settings for a set inside our new settings vairable
		$hor_tabs = array();

		$hor_tabs[] = array(
			'id' => 'ipt_fsqm_form_custom_options',
			'label' => __( 'Selectables', 'domain' ),
			'callback' => array( $this, 'settings_options' ),
		);

		$hor_tabs[] = array(
			'id' => 'ipt_fsqm_form_custom_inputs',
			'label' => __( 'Writables', 'domain' ),
			'callback' => array( $this, 'settings_inputs' ),
		);

		// Call the builtin UI element
		// @see IPT_Plugin_UIF_Admin
		$this->that->ui->tabs( $hor_tabs, false, true );

	}

	public function settings_options() {
		// Get our options variables
		$op = $this->that->settings['custom']['options'];

		// Set the radio/checkbox items
		$items = array(
			0 => array(
				'value' => 'op1',
				'label' => __( 'Option 1' ),
			),
			1 => array(
				'value' => 'op2',
				'label' => __( 'Option 2' ),
			),
			2 => array(
				'value' => 'op3',
				'label' => __( 'Option 3' ),
			),
			3 => array(
				'value' => 'op4',
				'label' => __( 'Option 4' ),
			),
		);
		// 'options' => array(
		// 	'bool' => true,
		// 	'singleop' => 'op1', // For radio input
		// 	'multipleop' => array(), // Whenever adding checkbox related options, always add an empty array. This is just how FSQM backend works
		// 	                         // You can look into IPT_FSQM_Form_Elements_Base::merge_elements and you'd understand why
		// ),

		// Now populate the table
		?>
<table class="form-table">
	<tbody>
		<tr>
			<th><?php $this->that->ui->generate_label( 'settings[custom][options][bool]', __( 'Toggle Element', 'domain' ) ); ?></th>
			<td>
				<?php $this->that->ui->toggle( 'settings[custom][options][bool]', __( 'Yes', 'domain' ), __( 'No', 'domain' ), $op['bool'] ); ?>
			</td>
			<td>
				<?php $this->that->ui->help( __( 'Some inline help', 'domain' ) ); ?>
			</td>
		</tr>
		<tr>
			<th><?php $this->that->ui->generate_label( 'settings[custom][options][singleop]', __( 'Radio Element', 'domain' ) ); ?></th>
			<td>
				<?php $this->that->ui->radios( 'settings[custom][options][singleop]', $items, $op['singleop'] ); ?>
			</td>
			<td>
				<?php $this->that->ui->help( __( 'Some inline help', 'domain' ) ); ?>
			</td>
		</tr>
		<tr>
			<th><?php $this->that->ui->generate_label( 'settings[custom][options][multipleop]', __( 'Checkbox Element', 'domain' ) ); ?></th>
			<td>
				<?php $this->that->ui->checkboxes( 'settings[custom][options][multipleop][]', $items, $op['multipleop'] ); ?>
			</td>
			<td>
				<?php $this->that->ui->help( __( 'Some inline help', 'domain' ) ); ?>
			</td>
		</tr>
	</tbody>
</table>
		<?php
	}

	public function settings_inputs() {
		// Get our settings
		$op = $this->that->settings['custom']['inputs'];

		// Now populate the table
		// 'inputs' => array(
		// 	'oneliner' => 'This is some text',
		// 	'multiliner' => "This is some more\r\nWith multiple line",
		// ),
		?>
<table class="form-table">
	<tbody>
		<tr>
			<th><?php $this->that->ui->generate_label( 'settings[custom][inputs][oneliner]', __( 'Oneline Input', 'domain' ) ); ?></th>
			<td>
				<?php $this->that->ui->text( 'settings[custom][inputs][oneliner]', $op['oneliner'], __( 'Write here', 'domain' ) ); ?>
			</td>
			<td>
				<?php $this->that->ui->help( __( 'Some inline help', 'domain' ) ); ?>
			</td>
		</tr>
		<tr>
			<th><?php $this->that->ui->generate_label( 'settings[custom][inputs][multiliner]', __( 'Multiline Input', 'domain' ) ); ?></th>
			<td>
				<?php $this->that->ui->textarea( 'settings[custom][inputs][multiliner]', $op['multiliner'], __( 'Write here', 'domain' ) ); ?>
			</td>
			<td>
				<?php $this->that->ui->help( __( 'Some inline help', 'domain' ) ); ?>
			</td>
		</tr>
	</tbody>
</table>
		<?php
	}
}

$mycustom_settings = new FSQM_Add_Custom_Settings();