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<?php
/**
* CButtonColumn 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/
*/

Yii::import('zii.widgets.grid.CGridColumn');

/**
* CButtonColumn represents a grid view column that renders one or several buttons.
*
* By default, it will display three buttons, "view", "update" and "delete", which triggers the corresponding
* actions on the model of the row.
*
* By configuring {@link buttons} and {@link template} properties, the column can display other buttons
* and customize the display order of the buttons.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package zii.widgets.grid
* @since 1.1
*/
class CButtonColumn extends CGridColumn
{
/**
* @var array the HTML options for the data cell tags.
*/
public $htmlOptions=array('class'=>'button-column');
/**
* @var array the HTML options for the header cell tag.
*/
public $headerHtmlOptions=array('class'=>'button-column');
/**
* @var array the HTML options for the footer cell tag.
*/
public $footerHtmlOptions=array('class'=>'button-column');
/**
* @var string the template that is used to render the content in each data cell.
* These default tokens are recognized: {view}, {update} and {delete}. If the {@link buttons} property
* defines additional buttons, their IDs are also recognized here. For example, if a button named 'preview'
* is declared in {@link buttons}, we can use the token '{preview}' here to specify where to display the button.
*/
public $template='{view} {update} {delete}';
/**
* @var string the label for the view button. Defaults to "View".
* Note that the label will not be HTML-encoded when rendering.
*/
public $viewButtonLabel;
/**
* @var string the image URL for the view button. If not set, an integrated image will be used.
* You may set this property to be false to render a text link instead.
*/
public $viewButtonImageUrl;
/**
* @var string a PHP expression that is evaluated for every view button and whose result is used
* as the URL for the view button. In this expression, the variable
* <code>$row</code> the row number (zero-based); <code>$data</code> the data model for the row;
* and <code>$this</code> the column object.
*/
public $viewButtonUrl='Yii::app()->controller->createUrl("view",array("id"=>$data->primaryKey))';
/**
* @var array the HTML options for the view button tag.
*/
public $viewButtonOptions=array('class'=>'view');

/**
* @var string the label for the update button. Defaults to "Update".
* Note that the label will not be HTML-encoded when rendering.
*/
public $updateButtonLabel;
/**
* @var string the image URL for the update button. If not set, an integrated image will be used.
* You may set this property to be false to render a text link instead.
*/
public $updateButtonImageUrl;
/**
* @var string a PHP expression that is evaluated for every update button and whose result is used
* as the URL for the update button. In this expression, the variable
* <code>$row</code> the row number (zero-based); <code>$data</code> the data model for the row;
* and <code>$this</code> the column object.
*/
public $updateButtonUrl='Yii::app()->controller->createUrl("update",array("id"=>$data->primaryKey))';
/**
* @var array the HTML options for the update button tag.
*/
public $updateButtonOptions=array('class'=>'update');

/**
* @var string the label for the delete button. Defaults to "Delete".
* Note that the label will not be HTML-encoded when rendering.
*/
public $deleteButtonLabel;
/**
* @var string the image URL for the delete button. If not set, an integrated image will be used.
* You may set this property to be false to render a text link instead.
*/
public $deleteButtonImageUrl;
/**
* @var string a PHP expression that is evaluated for every delete button and whose result is used
* as the URL for the delete button. In this expression, the variable
* <code>$row</code> the row number (zero-based); <code>$data</code> the data model for the row;
* and <code>$this</code> the column object.
*/
public $deleteButtonUrl='Yii::app()->controller->createUrl("delete",array("id"=>$data->primaryKey))';
/**
* @var array the HTML options for the view button tag.
*/
public $deleteButtonOptions=array('class'=>'delete');
/**
* @var string the confirmation message to be displayed when delete button is clicked.
* By setting this property to be false, no confirmation message will be displayed.
* This property is used only if <code>$this->buttons['delete']['click']</code> is not set.
*/
public $deleteConfirmation;
/**
* @var string a javascript function that will be invoked after the delete ajax call.
* This property is used only if <code>$this->buttons['delete']['click']</code> is not set.
*
* The function signature is <code>function(link, success, data)</code>
* <ul>
* <li><code>link</code> references the delete link.</li>
* <li><code>success</code> status of the ajax call, true if the ajax call was successful, false if the ajax call failed.
* <li><code>data</code> the data returned by the server in case of a successful call or XHR object in case of error.
* </ul>
* Note that if success is true it does not mean that the delete was successful, it only means that the ajax call was successful.
*
* Example:
* <pre>
* array(
* class'=>'CButtonColumn',
* 'afterDelete'=>'function(link,success,data){ if(success) alert("Delete completed successfuly"); }',
* ),
* </pre>
*/
public $afterDelete;
/**
* @var array the configuration for additional buttons. Each array element specifies a single button
* which has the following format:
* <pre>
* 'buttonID' => array(
* 'label'=>'...', // text label of the button
* 'url'=>'...', // a PHP expression for generating the URL of the button
* 'imageUrl'=>'...', // image URL of the button. If not set or false, a text link is used
* 'options'=>array(...), // HTML options for the button tag
* 'click'=>'...', // a JS function to be invoked when the button is clicked
* 'visible'=>'...', // a PHP expression for determining whether the button is visible
* )
* </pre>
* In the PHP expression for the 'url' option and/or 'visible' option, the variable <code>$row</code>
* refers to the current row number (zero-based), and <code>$data</code> refers to the data model for
* the row.
*
* Note that in order to display these additional buttons, the {@link template} property needs to
* be configured so that the corresponding button IDs appear as tokens in the template.
*/
public $buttons=array();

/**
* Initializes the column.
* This method registers necessary client script for the button column.
*/
public function init()
{
$this->initDefaultButtons();

foreach($this->buttons as $id=>$button)
{
if(strpos($this->template,'{'.$id.'}')===false)
unset($this->buttons[$id]);
else if(isset($button['click']))
{
if(!isset($button['options']['class']))
$this->buttons[$id]['options']['class']=$id;
if(!($button['click'] instanceof CJavaScriptExpression))
$this->buttons[$id]['click']=new CJavaScriptExpression($button['click']);
}
}

$this->registerClientScript();
}

/**
* Initializes the default buttons (view, update and delete).
*/
protected function initDefaultButtons()
{
if($this->viewButtonLabel===null)
$this->viewButtonLabel=Yii::t('zii','View');
if($this->updateButtonLabel===null)
$this->updateButtonLabel=Yii::t('zii','Update');
if($this->deleteButtonLabel===null)
$this->deleteButtonLabel=Yii::t('zii','Delete');
if($this->viewButtonImageUrl===null)
$this->viewButtonImageUrl=$this->grid->baseScriptUrl.'/view.png';
if($this->updateButtonImageUrl===null)
$this->updateButtonImageUrl=$this->grid->baseScriptUrl.'/update.png';
if($this->deleteButtonImageUrl===null)
$this->deleteButtonImageUrl=$this->grid->baseScriptUrl.'/delete.png';
if($this->deleteConfirmation===null)
$this->deleteConfirmation=Yii::t('zii','Are you sure you want to delete this item?');

foreach(array('view','update','delete') as $id)
{
$button=array(
'label'=>$this->{$id.'ButtonLabel'},
'url'=>$this->{$id.'ButtonUrl'},
'imageUrl'=>$this->{$id.'ButtonImageUrl'},
'options'=>$this->{$id.'ButtonOptions'},
);
if(isset($this->buttons[$id]))
$this->buttons[$id]=array_merge($button,$this->buttons[$id]);
else
$this->buttons[$id]=$button;
}

if(!isset($this->buttons['delete']['click']))
{
if(is_string($this->deleteConfirmation))
$confirmation="if(!confirm(".CJavaScript::encode($this->deleteConfirmation).")) return false;";
else
$confirmation='';

if(Yii::app()->request->enableCsrfValidation)
{
$csrfTokenName = Yii::app()->request->csrfTokenName;
$csrfToken = Yii::app()->request->csrfToken;
$csrf = "\n\t\tdata:{ '$csrfTokenName':'$csrfToken' },";
}
else
$csrf = '';

if($this->afterDelete===null)
$this->afterDelete='function(){}';

$this->buttons['delete']['click']=<<<EOD
function() {
$confirmation
var th=this;
var afterDelete=$this->afterDelete;
$.fn.yiiGridView.update('{$this->grid->id}', {
type:'POST',
url:$(this).attr('href'),$csrf
success:function(data) {
$.fn.yiiGridView.update('{$this->grid->id}');
afterDelete(th,true,data);
},
error:function(XHR) {
return afterDelete(th,false,XHR);
}
});
return false;
}
EOD;
}
}

/**
* Registers the client scripts for the button column.
*/
protected function registerClientScript()
{
$js=array();
foreach($this->buttons as $id=>$button)
{
if(isset($button['click']))
{
$function=CJavaScript::encode($button['click']);
$class=preg_replace('/\s+/','.',$button['options']['class']);
$js[]="$(document).on('click','#{$this->grid->id} a.{$class}',$function);";
}
}

if($js!==array())
Yii::app()->getClientScript()->registerScript(__CLASS__.'#'.$this->id, implode("\n",$js));
}

/**
* Renders the data cell content.
* This method renders the view, update and delete buttons in the data cell.
* @param integer $row the row number (zero-based)
* @param mixed $data the data associated with the row
*/
protected function renderDataCellContent($row,$data)
{
$tr=array();
ob_start();
foreach($this->buttons as $id=>$button)
{
$this->renderButton($id,$button,$row,$data);
$tr['{'.$id.'}']=ob_get_contents();
ob_clean();
}
ob_end_clean();
echo strtr($this->template,$tr);
}

/**
* Renders a link button.
* @param string $id the ID of the button
* @param array $button the button configuration which may contain 'label', 'url', 'imageUrl' and 'options' elements.
* See {@link buttons} for more details.
* @param integer $row the row number (zero-based)
* @param mixed $data the data object associated with the row
*/
protected function renderButton($id,$button,$row,$data)
{
if (isset($button['visible']) && !$this->evaluateExpression($button['visible'],array('row'=>$row,'data'=>$data)))
   return;
$label=isset($button['label']) ? $button['label'] : $id;
$url=isset($button['url']) ? $this->evaluateExpression($button['url'],array('data'=>$data,'row'=>$row)) : '#';
$options=isset($button['options']) ? $button['options'] : array();
if(!isset($options['title']))
$options['title']=$label;
if(isset($button['imageUrl']) && is_string($button['imageUrl']))
echo CHtml::link(CHtml::image($button['imageUrl'],$label),$url,$options);
else
echo CHtml::link($label,$url,$options);
}
}
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