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name : FormView.php
 <?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Form;

use Symfony\Component\Form\Exception\BadMethodCallException;

/**
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
class FormView implements \ArrayAccess, \IteratorAggregate, \Countable
{
    /**
     * The variables assigned to this view.
     * @var array
     */
    public $vars = array(
        'value' => null,
        'attr'  => array(),
    );

    /**
     * The parent view.
     * @var FormView
     */
    public $parent;

    /**
     * The child views.
     * @var array
     */
    public $children = array();

    /**
     * Is the form attached to this renderer rendered?
     *
     * Rendering happens when either the widget or the row method was called.
     * Row implicitly includes widget, however certain rendering mechanisms
     * have to skip widget rendering when a row is rendered.
     *
     * @var Boolean
     */
    private $rendered = false;

    public function __construct(FormView $parent = null)
    {
        $this->parent = $parent;
    }

    /**
     * Returns whether the view was already rendered.
     *
     * @return Boolean Whether this view's widget is rendered.
     */
    public function isRendered()
    {
        $hasChildren = 0 < count($this->children);

        if (true === $this->rendered || !$hasChildren) {
            return $this->rendered;
        }

        if ($hasChildren) {
            foreach ($this->children as $child) {
                if (!$child->isRendered()) {
                    return false;
                }
            }

            return $this->rendered = true;
        }

        return false;
    }

    /**
     * Marks the view as rendered.
     *
     * @return FormView The view object.
     */
    public function setRendered()
    {
        $this->rendered = true;

        return $this;
    }

    /**
     * Returns a child by name (implements \ArrayAccess).
     *
     * @param string $name The child name
     *
     * @return FormView The child view
     */
    public function offsetGet($name)
    {
        return $this->children[$name];
    }

    /**
     * Returns whether the given child exists (implements \ArrayAccess).
     *
     * @param string $name The child name
     *
     * @return Boolean Whether the child view exists
     */
    public function offsetExists($name)
    {
        return isset($this->children[$name]);
    }

    /**
     * Implements \ArrayAccess.
     *
     * @throws BadMethodCallException always as setting a child by name is not allowed
     */
    public function offsetSet($name, $value)
    {
        throw new BadMethodCallException('Not supported');
    }

    /**
     * Removes a child (implements \ArrayAccess).
     *
     * @param string $name The child name
     */
    public function offsetUnset($name)
    {
        unset($this->children[$name]);
    }

    /**
     * Returns an iterator to iterate over children (implements \IteratorAggregate)
     *
     * @return \ArrayIterator The iterator
     */
    public function getIterator()
    {
        return new \ArrayIterator($this->children);
    }

    /**
     * Implements \Countable.
     *
     * @return integer The number of children views
     */
    public function count()
    {
        return count($this->children);
    }
}
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