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<?php
/**
* CForm class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CForm represents a form object that contains form input specifications.
*
* The main purpose of introducing the abstraction of form objects is to enhance the
* reusability of forms. In particular, we can divide a form in two parts: those
* that specify each individual form inputs, and those that decorate the form inputs.
* A CForm object represents the former part. It relies on the rendering process to
* accomplish form input decoration. Reusability is mainly achieved in the rendering process.
* That is, a rendering process can be reused to render different CForm objects.
*
* A form can be rendered in different ways. One can call the {@link render} method
* to get a quick form rendering without writing any HTML code; one can also override
* {@link render} to render the form in a different layout; and one can use an external
* view template to render each form element explicitly. In these ways, the {@link render}
* method can be applied to all kinds of forms and thus achieves maximum reusability;
* while the external view template keeps maximum flexibility in rendering complex forms.
*
* Form input specifications are organized in terms of a form element hierarchy.
* At the root of the hierarchy, it is the root CForm object. The root form object maintains
* its children in two collections: {@link elements} and {@link buttons}.
* The former contains non-button form elements ({@link CFormStringElement},
* {@link CFormInputElement} and CForm); while the latter mainly contains
* button elements ({@link CFormButtonElement}). When a CForm object is embedded in the
* {@link elements} collection, it is called a sub-form which can have its own {@link elements}
* and {@link buttons} collections and thus form the whole form hierarchy.
*
* Sub-forms are mainly used to handle multiple models. For example, in a user
* registration form, we can have the root form to collect input for the user
* table while a sub-form to collect input for the profile table. Sub-form is also
* a good way to partition a lengthy form into shorter ones, even though all inputs
* may belong to the same model.
*
* Form input specifications are given in terms of a configuration array which is
* used to initialize the property values of a CForm object. The {@link elements} and
* {@link buttons} properties need special attention as they are the main properties
* to be configured. To configure {@link elements}, we should give it an array like
* the following:
* <pre>
* 'elements'=>array(
* 'username'=>array('type'=>'text', 'maxlength'=>80),
* 'password'=>array('type'=>'password', 'maxlength'=>80),
* )
* </pre>
* The above code specifies two input elements: 'username' and 'password'. Note the model
* object must have exactly the same attributes 'username' and 'password'. Each element
* has a type which specifies what kind of input should be used. The rest of the array elements
* (e.g. 'maxlength') in an input specification are rendered as HTML element attributes
* when the input field is rendered. The {@link buttons} property is configured similarly.
*
* For more details about configuring form elements, please refer to {@link CFormInputElement}
* and {@link CFormButtonElement}.
*
* @property CForm $root The top-level form object.
* @property CActiveForm $activeFormWidget The active form widget associated with this form.
* This method will return the active form widget as specified by {@link activeForm}.
* @property CBaseController $owner The owner of this form. This refers to either a controller or a widget
* by which the form is created and rendered.
* @property CModel $model The model associated with this form. If this form does not have a model,
* it will look for a model in its ancestors.
* @property array $models The models that are associated with this form or its sub-forms.
* @property CFormElementCollection $elements The form elements.
* @property CFormElementCollection $buttons The form elements.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.web.form
* @since 1.1
*/
class CForm extends CFormElement implements ArrayAccess
{
/**
* @var string the title for this form. By default, if this is set, a fieldset may be rendered
* around the form body using the title as its legend. Defaults to null.
*/
public $title;
/**
* @var string the description of this form.
*/
public $description;
/**
* @var string the submission method of this form. Defaults to 'post'.
* This property is ignored when this form is a sub-form.
*/
public $method='post';
/**
* @var mixed the form action URL (see {@link CHtml::normalizeUrl} for details about this parameter.)
* Defaults to an empty string, meaning the current request URL.
* This property is ignored when this form is a sub-form.
*/
public $action='';
/**
* @var string the name of the class for representing a form input element. Defaults to 'CFormInputElement'.
*/
public $inputElementClass='CFormInputElement';
/**
* @var string the name of the class for representing a form button element. Defaults to 'CFormButtonElement'.
*/
public $buttonElementClass='CFormButtonElement';
/**
* @var array HTML attribute values for the form tag. When the form is embedded within another form,
* this property will be used to render the HTML attribute values for the fieldset enclosing the child form.
*/
public $attributes=array();
/**
* @var boolean whether to show error summary. Defaults to false.
*/
public $showErrorSummary=false;
/**
* @var array the configuration used to create the active form widget.
* The widget will be used to render the form tag and the error messages.
* The 'class' option is required, which specifies the class of the widget.
* The rest of the options will be passed to {@link CBaseController::beginWidget()} call.
* Defaults to array('class'=>'CActiveForm').
* @since 1.1.1
*/
public $activeForm=array('class'=>'CActiveForm');

private $_model;
private $_elements;
private $_buttons;
private $_activeForm;

/**
* Constructor.
* If you override this method, make sure you do not modify the method
* signature, and also make sure you call the parent implementation.
* @param mixed $config the configuration for this form. It can be a configuration array
* or the path alias of a PHP script file that returns a configuration array.
* The configuration array consists of name-value pairs that are used to initialize
* the properties of this form.
* @param CModel $model the model object associated with this form. If it is null,
* the parent's model will be used instead.
* @param mixed $parent the direct parent of this form. This could be either a {@link CBaseController}
* object (a controller or a widget), or a {@link CForm} object.
* If the former, it means the form is a top-level form; if the latter, it means this form is a sub-form.
*/
public function __construct($config,$model=null,$parent=null)
{
$this->setModel($model);
if($parent===null)
$parent=Yii::app()->getController();
parent::__construct($config,$parent);
$this->init();
}

/**
* Initializes this form.
* This method is invoked at the end of the constructor.
* You may override this method to provide customized initialization (such as
* configuring the form object).
*/
protected function init()
{
}

/**
* Returns a value indicating whether this form is submitted.
* @param string $buttonName the name of the submit button
* @param boolean $loadData whether to call {@link loadData} if the form is submitted so that
* the submitted data can be populated to the associated models.
* @return boolean whether this form is submitted.
* @see loadData
*/
public function submitted($buttonName='submit',$loadData=true)
{
$ret=$this->clicked($this->getUniqueId()) && $this->clicked($buttonName);
if($ret && $loadData)
$this->loadData();
return $ret;
}

/**
* Returns a value indicating whether the specified button is clicked.
* @param string $name the button name
* @return boolean whether the button is clicked.
*/
public function clicked($name)
{
if(strcasecmp($this->getRoot()->method,'get'))
return isset($_POST[$name]);
else
return isset($_GET[$name]);
}

/**
* Validates the models associated with this form.
* All models, including those associated with sub-forms, will perform
* the validation. You may use {@link CModel::getErrors()} to retrieve the validation
* error messages.
* @return boolean whether all models are valid
*/
public function validate()
{
$ret=true;
foreach($this->getModels() as $model)
$ret=$model->validate() && $ret;
return $ret;
}

/**
* Loads the submitted data into the associated model(s) to the form.
* This method will go through all models associated with this form and its sub-forms
* and massively assign the submitted data to the models.
* @see submitted
*/
public function loadData()
{
if($this->_model!==null)
{
$class=get_class($this->_model);
if(strcasecmp($this->getRoot()->method,'get'))
{
if(isset($_POST[$class]))
$this->_model->setAttributes($_POST[$class]);
}
else if(isset($_GET[$class]))
$this->_model->setAttributes($_GET[$class]);
}
foreach($this->getElements() as $element)
{
if($element instanceof self)
$element->loadData();
}
}

/**
* @return CForm the top-level form object
*/
public function getRoot()
{
$root=$this;
while($root->getParent() instanceof self)
$root=$root->getParent();
return $root;
}

/**
* @return CActiveForm the active form widget associated with this form.
* This method will return the active form widget as specified by {@link activeForm}.
* @since 1.1.1
*/
public function getActiveFormWidget()
{
if($this->_activeForm!==null)
return $this->_activeForm;
else
return $this->getRoot()->_activeForm;
}

/**
* @return CBaseController the owner of this form. This refers to either a controller or a widget
* by which the form is created and rendered.
*/
public function getOwner()
{
$owner=$this->getParent();
while($owner instanceof self)
$owner=$owner->getParent();
return $owner;
}

/**
* Returns the model that this form is associated with.
* @param boolean $checkParent whether to return parent's model if this form doesn't have model by itself.
* @return CModel the model associated with this form. If this form does not have a model,
* it will look for a model in its ancestors.
*/
public function getModel($checkParent=true)
{
if(!$checkParent)
return $this->_model;
$form=$this;
while($form->_model===null && $form->getParent() instanceof self)
$form=$form->getParent();
return $form->_model;
}

/**
* @param CModel $model the model to be associated with this form
*/
public function setModel($model)
{
$this->_model=$model;
}

/**
* Returns all models that are associated with this form or its sub-forms.
* @return array the models that are associated with this form or its sub-forms.
*/
public function getModels()
{
$models=array();
if($this->_model!==null)
$models[]=$this->_model;
foreach($this->getElements() as $element)
{
if($element instanceof self)
$models=array_merge($models,$element->getModels());
}
return $models;
}

/**
* Returns the input elements of this form.
* This includes text strings, input elements and sub-forms.
* Note that the returned result is a {@link CFormElementCollection} object, which
* means you can use it like an array. For more details, see {@link CMap}.
* @return CFormElementCollection the form elements.
*/
public function getElements()
{
if($this->_elements===null)
$this->_elements=new CFormElementCollection($this,false);
return $this->_elements;
}

/**
* Configures the input elements of this form.
* The configuration must be an array of input configuration array indexed by input name.
* Each input configuration array consists of name-value pairs that are used to initialize
* a {@link CFormStringElement} object (when 'type' is 'string'), a {@link CFormElement} object
* (when 'type' is a string ending with 'Form'), or a {@link CFormInputElement} object in
* all other cases.
* @param array $elements the elements configurations
*/
public function setElements($elements)
{
$collection=$this->getElements();
foreach($elements as $name=>$config)
$collection->add($name,$config);
}

/**
* Returns the button elements of this form.
* Note that the returned result is a {@link CFormElementCollection} object, which
* means you can use it like an array. For more details, see {@link CMap}.
* @return CFormElementCollection the form elements.
*/
public function getButtons()
{
if($this->_buttons===null)
$this->_buttons=new CFormElementCollection($this,true);
return $this->_buttons;
}

/**
* Configures the buttons of this form.
* The configuration must be an array of button configuration array indexed by button name.
* Each button configuration array consists of name-value pairs that are used to initialize
* a {@link CFormButtonElement} object.
* @param array $buttons the button configurations
*/
public function setButtons($buttons)
{
$collection=$this->getButtons();
foreach($buttons as $name=>$config)
$collection->add($name,$config);
}

/**
* Renders the form.
* The default implementation simply calls {@link renderBegin}, {@link renderBody} and {@link renderEnd}.
* @return string the rendering result
*/
public function render()
{
return $this->renderBegin() . $this->renderBody() . $this->renderEnd();
}

/**
* Renders the open tag of the form.
* The default implementation will render the open form tag.
* @return string the rendering result
*/
public function renderBegin()
{
if($this->getParent() instanceof self)
return '';
else
{
$options=$this->activeForm;
if(isset($options['class']))
{
$class=$options['class'];
unset($options['class']);
}
else
$class='CActiveForm';
$options['action']=$this->action;
$options['method']=$this->method;
if(isset($options['htmlOptions']))
{
foreach($this->attributes as $name=>$value)
$options['htmlOptions'][$name]=$value;
}
else
$options['htmlOptions']=$this->attributes;
ob_start();
$this->_activeForm=$this->getOwner()->beginWidget($class, $options);
return ob_get_clean() . "<div style=\"visibility:hidden\">".CHtml::hiddenField($this->getUniqueID(),1)."</div>\n";
}
}

/**
* Renders the close tag of the form.
* @return string the rendering result
*/
public function renderEnd()
{
if($this->getParent() instanceof self)
return '';
else
{
ob_start();
$this->getOwner()->endWidget();
return ob_get_clean();
}
}

/**
* Renders the body content of this form.
* This method mainly renders {@link elements} and {@link buttons}.
* If {@link title} or {@link description} is specified, they will be rendered as well.
* And if the associated model contains error, the error summary may also be displayed.
* The form tag will not be rendered. Please call {@link renderBegin} and {@link renderEnd}
* to render the open and close tags of the form.
* You may override this method to customize the rendering of the form.
* @return string the rendering result
*/
public function renderBody()
{
$output='';
if($this->title!==null)
{
if($this->getParent() instanceof self)
{
$attributes=$this->attributes;
unset($attributes['name'],$attributes['type']);
$output=CHtml::openTag('fieldset', $attributes)."<legend>".$this->title."</legend>\n";
}
else
$output="<fieldset>\n<legend>".$this->title."</legend>\n";
}

if($this->description!==null)
$output.="<div class=\"description\">\n".$this->description."</div>\n";

if($this->showErrorSummary && ($model=$this->getModel(false))!==null)
$output.=$this->getActiveFormWidget()->errorSummary($model)."\n";

$output.=$this->renderElements()."\n".$this->renderButtons()."\n";

if($this->title!==null)
$output.="</fieldset>\n";

return $output;
}

/**
* Renders the {@link elements} in this form.
* @return string the rendering result
*/
public function renderElements()
{
$output='';
foreach($this->getElements() as $element)
$output.=$this->renderElement($element);
return $output;
}

/**
* Renders the {@link buttons} in this form.
* @return string the rendering result
*/
public function renderButtons()
{
$output='';
foreach($this->getButtons() as $button)
$output.=$this->renderElement($button);
return $output!=='' ? "<div class=\"row buttons\">".$output."</div>\n" : '';
}

/**
* Renders a single element which could be an input element, a sub-form, a string, or a button.
* @param mixed $element the form element to be rendered. This can be either a {@link CFormElement} instance
* or a string representing the name of the form element.
* @return string the rendering result
*/
public function renderElement($element)
{
if(is_string($element))
{
if(($e=$this[$element])===null && ($e=$this->getButtons()->itemAt($element))===null)
return $element;
else
$element=$e;
}
if($element->getVisible())
{
if($element instanceof CFormInputElement)
{
if($element->type==='hidden')
return "<div style=\"visibility:hidden\">\n".$element->render()."</div>\n";
else
return "<div class=\"row field_{$element->name}\">\n".$element->render()."</div>\n";
}
else if($element instanceof CFormButtonElement)
return $element->render()."\n";
else
return $element->render();
}
return '';
}

/**
* This method is called after an element is added to the element collection.
* @param string $name the name of the element
* @param CFormElement $element the element that is added
* @param boolean $forButtons whether the element is added to the {@link buttons} collection.
* If false, it means the element is added to the {@link elements} collection.
*/
public function addedElement($name,$element,$forButtons)
{
}

/**
* This method is called after an element is removed from the element collection.
* @param string $name the name of the element
* @param CFormElement $element the element that is removed
* @param boolean $forButtons whether the element is removed from the {@link buttons} collection
* If false, it means the element is removed from the {@link elements} collection.
*/
public function removedElement($name,$element,$forButtons)
{
}

/**
* Evaluates the visibility of this form.
* This method will check the visibility of the {@link elements}.
* If any one of them is visible, the form is considered as visible. Otherwise, it is invisible.
* @return boolean whether this form is visible.
*/
protected function evaluateVisible()
{
foreach($this->getElements() as $element)
if($element->getVisible())
return true;
return false;
}

/**
* Returns a unique ID that identifies this form in the current page.
* @return string the unique ID identifying this form
*/
protected function getUniqueId()
{
if(isset($this->attributes['id']))
return 'yform_'.$this->attributes['id'];
else
return 'yform_'.sprintf('%x',crc32(serialize(array_keys($this->getElements()->toArray()))));
}

/**
* Returns whether there is an element at the specified offset.
* This method is required by the interface ArrayAccess.
* @param mixed $offset the offset to check on
* @return boolean
*/
public function offsetExists($offset)
{
return $this->getElements()->contains($offset);
}

/**
* Returns the element at the specified offset.
* This method is required by the interface ArrayAccess.
* @param integer $offset the offset to retrieve element.
* @return mixed the element at the offset, null if no element is found at the offset
*/
public function offsetGet($offset)
{
return $this->getElements()->itemAt($offset);
}

/**
* Sets the element at the specified offset.
* This method is required by the interface ArrayAccess.
* @param integer $offset the offset to set element
* @param mixed $item the element value
*/
public function offsetSet($offset,$item)
{
$this->getElements()->add($offset,$item);
}

/**
* Unsets the element at the specified offset.
* This method is required by the interface ArrayAccess.
* @param mixed $offset the offset to unset element
*/
public function offsetUnset($offset)
{
$this->getElements()->remove($offset);
}
}
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