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<?php
/**
* Class Tribe__Field_Conditional
*
* A work-around for PHP 5.2 lack of closure support to wrap
*
* Example usage: in the context of the definition of a list of fields to be fed to the Tribe__Settings class:
*
* $fields = array(
* 'foo' => array(
* 'type' => 'checkbox_bool',
* // ...
* ),
* 'bar' => array(
* 'type' => 'text'
* 'validate_if' => new Tribe__Field_Conditional( 'foo', 'tribe_is_truthy' )
* 'conditional' => tribe_is_truthy( tribe_get_option( 'foo' ) ),
* // ...
* ),
* );
*
* The above will modify the validation logic to make it so that the field will not be validated if
* the parent (`foo` in the example) is not "truthy".
* If you need to hide/show the field conditionally use the `conditional` attribute of the field.
*
* @since 4.7.7
*/
class Tribe__Field_Conditional {
/**
* @var string The slug of the field the condition
*/
protected $depends_on;
/**
* @var bool|callable
*/
protected $condition;
/**
* Tribe__Field_Conditional constructor.
*
* @since 4.7.7
*
* @param string $depends_on_field The slug or identifier of the parent field.
* @param mixed|callable $condition Either a valid callable function or method or a
* value that will be used for a shallow comparison.
*/
public function __construct( $depends_on_field, $condition = true ) {
$this->depends_on = $depends_on_field;
$this->condition = $condition;
}
/**
* @param mixed $value The value to check, typically the parent field value.
* @param array $fields An array of all the current fields; this will be passed to
* the condition callback function for context if the condition
* is a callable function or method.
*
* @return bool Whether the check was successful (the parent field does have the required
* value) or not.
*/
public function check( $value, array $fields ) {
return is_callable( $this->condition )
? call_user_func( $this->condition, $value, $fields )
: $value == $this->condition;
}
/**
* Return the id/slug of the field this condition depends on.
*
* @since 4.7.7
*
* @return string
*/
public function depends_on() {
return $this->depends_on;
}
}