<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\grid;

use Closure;
use yii\base\InvalidConfigException;
use yii\helpers\Html;

/**
 * CheckboxColumn displays a column of checkboxes in a grid view.
 * Users may click on the checkboxes to select rows of the grid. The selected rows may be
 * obtained by calling the following JavaScript code:
 *
 * ~~~
 * var keys = $('#grid').yiiGridView('getSelectedRows');
 * // keys is an array consisting of the keys associated with the selected rows
 * ~~~
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class CheckboxColumn extends Column
{
	public $name = 'selection';
	public $checkboxOptions = array();
	public $multiple = true;


	public function init()
	{
		parent::init();
		if (empty($this->name)) {
			throw new InvalidConfigException('The "name" property must be set.');
		}
		if (substr($this->name, -2) !== '[]') {
			$this->name .= '[]';
		}
	}

	/**
	 * Renders the header cell content.
	 * The default implementation simply renders {@link header}.
	 * This method may be overridden to customize the rendering of the header cell.
	 * @return string the rendering result
	 */
	protected function renderHeaderCellContent()
	{
		$name = rtrim($this->name, '[]') . '_all';
		$id = $this->grid->options['id'];
		$options = json_encode(array(
			'name' => $this->name,
			'multiple' => $this->multiple,
			'checkAll' => $name,
		));
		$this->grid->getView()->registerJs("jQuery('#$id').yiiGridView('setSelectionColumn', $options);");

		if ($this->header !== null || !$this->multiple) {
			return parent::renderHeaderCellContent();
		} else {
			return Html::checkBox($name, false, array('class' => 'select-on-check-all'));
		}
	}

	/**
	 * Renders the data cell content.
	 * @param mixed $model the data model
	 * @param integer $index the zero-based index of the data model among the models array returned by [[dataProvider]].
	 * @return string the rendering result
	 */
	protected function renderDataCellContent($model, $index)
	{
		if ($this->checkboxOptions instanceof Closure) {
			$options = call_user_func($this->checkboxOptions, $model, $index, $this);
		} else {
			$options = $this->checkboxOptions;
		}
		return Html::checkbox($this->name, !empty($options['checked']), $options);
	}
}
