silverstripe-framework/forms/PopoverField.php

<?php

/**
 * Popup form action menu for "more options"
 *
 * Only works with react forms at the moment
 */
class PopoverField extends FieldGroup
{
	private static $cast = [
		'PopoverTitle' => 'HTMLText'
	];

	/**
	 * Use custom react component
	 *
	 * @var string
	 */
	protected $schemaComponent = 'PopoverField';

	/**
	 * Optional title on popup box
	 *
	 * @var string
	 */
	protected $popoverTitle = null;

	/**
	 * Placement of the popup box, relative to the element triggering it.
	 * Valid values: bottom, top, left, right.
	 *
	 * @var string
	 */
	protected $placement = 'bottom';

	/**
	 * Get popup title
	 *
	 * @return string
	 */
	public function getPopoverTitle()
	{
		return $this->popoverTitle;
	}

	/**
	 * Set popup title
	 *
	 * @param string $popoverTitle
	 * @return $this
	 */
	public function setPopoverTitle($popoverTitle)
	{
		$this->popoverTitle = $popoverTitle;
		return $this;
	}

	/**
	 * Get popup placement
	 *
	 * @return string
	 */
	public function getPlacement()
	{
		return $this->placement;
	}

	public function setPlacement($placement)
	{
		$valid = ['top', 'right', 'bottom', 'left'];

		if (!in_array($placement, $valid)) {
			throw new InvalidArgumentException(
				'Invalid placement value. Valid: top, left, bottom, right'
			);
		}

		$this->placement = $placement;

		return $this;
	}

	public function getSchemaDataDefaults()
	{
		$schema = parent::getSchemaDataDefaults();

		$schema['data']['popoverTitle'] = $this->getPopoverTitle();
		$schema['data']['placement'] = $this->getPlacement();

		return $schema;
	}
}