<?php
/**
 * TTemplateColumn class file
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @package Prado\Web\UI\WebControls
 */

namespace Prado\Web\UI\WebControls;
use Prado\Web\UI\ITemplate;
use Prado\Exceptions\TInvalidDataTypeException;
use Prado\Prado;

/**
 * TTemplateColumn class
 *
 * TTemplateColumn customizes the layout of controls in the column with templates.
 * In particular, you can specify {@link setItemTemplate ItemTemplate},
 * {@link setEditItemTemplate EditItemTemplate}, {@link setHeaderTemplate HeaderTemplate}
 * and {@link setFooterTemplate FooterTemplate} to customize specific
 * type of cells in the column.
 *
 * Since v3.1.0, TTemplateColumn has introduced two new properties {@link setItemRenderer ItemRenderer}
 * and {@link setEditItemRenderer EditItemRenderer} which can be used to specify
 * the layout of the datagrid cells in browsing and editing mode.
 * A renderer refers to a control class that is to be instantiated as a control.
 * For more details, see {@link TRepeater} and {@link TDataList}.
 *
 * When a renderer and a template are both defined for a type of item, the former
 * takes precedence.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package Prado\Web\UI\WebControls
 * @since 3.0
 */
class TTemplateColumn extends TDataGridColumn
{
	/**
	 * Various item templates
	 * @var string
	 */
	private $_itemTemplate=null;
	private $_editItemTemplate=null;
	private $_headerTemplate=null;
	private $_footerTemplate=null;

	/**
	 * @return string the class name for the item cell renderer. Defaults to empty, meaning not set.
	 * @since 3.1.0
	 */
	public function getItemRenderer()
	{
		return $this->getViewState('ItemRenderer','');
	}

	/**
	 * Sets the item cell renderer class.
	 *
	 * If not empty, the class will be used to instantiate as a child control in the item cells of the column.
	 *
	 * If the class implements {@link \Prado\IDataRenderer}, the <b>Data</b> property
	 * will be set as the row of the data associated with the datagrid item that this cell resides in.
	 *
	 * @param string the renderer class name in namespace format.
	 * @since 3.1.0
	 */
	public function setItemRenderer($value)
	{
		$this->setViewState('ItemRenderer',$value,'');
	}

	/**
	 * @return string the class name for the edit item cell renderer. Defaults to empty, meaning not set.
	 * @since 3.1.0
	 */
	public function getEditItemRenderer()
	{
		return $this->getViewState('EditItemRenderer','');
	}

	/**
	 * Sets the edit item cell renderer class.
	 *
	 * If not empty, the class will be used to instantiate as a child control in the item cell that is in edit mode.
	 *
	 * If the class implements {@link \Prado\IDataRenderer}, the <b>Data</b> property
	 * will be set as the row of the data associated with the datagrid item that this cell resides in.
	 *
	 * @param string the renderer class name in namespace format.
	 * @since 3.1.0
	 */
	public function setEditItemRenderer($value)
	{
		$this->setViewState('EditItemRenderer',$value,'');
	}

	/**
	 * @return ITemplate the edit item template
	 */
	public function getEditItemTemplate()
	{
		return $this->_editItemTemplate;
	}

	/**
	 * @param ITemplate the edit item template
	 * @throws TInvalidDataTypeException if the input is not an {@link ITemplate} or not null.
	 */
	public function setEditItemTemplate($value)
	{
		if($value instanceof ITemplate || $value===null)
			$this->_editItemTemplate=$value;
		else
			throw new TInvalidDataTypeException('templatecolumn_template_required','EditItemTemplate');
	}

	/**
	 * @return ITemplate the item template
	 */
	public function getItemTemplate()
	{
		return $this->_itemTemplate;
	}

	/**
	 * @param ITemplate the item template
	 * @throws TInvalidDataTypeException if the input is not an {@link ITemplate} or not null.
	 */
	public function setItemTemplate($value)
	{
		if($value instanceof ITemplate || $value===null)
			$this->_itemTemplate=$value;
		else
			throw new TInvalidDataTypeException('templatecolumn_template_required','ItemTemplate');
	}

	/**
	 * @return ITemplate the header template
	 */
	public function getHeaderTemplate()
	{
		return $this->_headerTemplate;
	}

	/**
	 * @param ITemplate the header template.
	 * @throws TInvalidDataTypeException if the input is not an {@link ITemplate} or not null.
	 */
	public function setHeaderTemplate($value)
	{
		if($value instanceof ITemplate || $value===null)
			$this->_headerTemplate=$value;
		else
			throw new TInvalidDataTypeException('templatecolumn_template_required','HeaderTemplate');
	}

	/**
	 * @return ITemplate the footer template
	 */
	public function getFooterTemplate()
	{
		return $this->_footerTemplate;
	}

	/**
	 * @param ITemplate the footer template
	 * @throws TInvalidDataTypeException if the input is not an {@link ITemplate} or not null.
	 */
	public function setFooterTemplate($value)
	{
		if($value instanceof ITemplate || $value===null)
			$this->_footerTemplate=$value;
		else
			throw new TInvalidDataTypeException('templatecolumn_template_required','FooterTemplate');
	}

	/**
	 * Initializes the specified cell to its initial values.
	 * This method overrides the parent implementation.
	 * It initializes the cell based on different templates
	 * (ItemTemplate, EditItemTemplate, HeaderTemplate, FooterTemplate).
	 * @param TTableCell the cell to be initialized.
	 * @param integer the index to the Columns property that the cell resides in.
	 * @param string the type of cell (Header,Footer,Item,AlternatingItem,EditItem,SelectedItem)
	 */
	public function initializeCell($cell,$columnIndex,$itemType)
	{
		if($itemType===TListItemType::Item || $itemType===TListItemType::AlternatingItem || $itemType===TListItemType::SelectedItem || $itemType===TListItemType::EditItem)
		{
			if($itemType===TListItemType::EditItem)
			{
				if(($classPath=$this->getEditItemRenderer())==='' && ($template=$this->_editItemTemplate)===null)
				{
					$classPath=$this->getItemRenderer();
					$template=$this->_itemTemplate;
				}
			}
			else
			{
				$template=$this->_itemTemplate;
				$classPath=$this->getItemRenderer();
			}
			if($classPath!=='')
			{
				$control=Prado::createComponent($classPath);
				$cell->getControls()->add($control);
				if($control instanceof IItemDataRenderer)
				{
					$control->setItemIndex($cell->getParent()->getItemIndex());
					$control->setItemType($itemType);
				}
				if($control instanceof \Prado\IDataRenderer)
					$control->attachEventHandler('OnDataBinding',array($this,'dataBindColumn'));
			}
			else if($template!==null)
				$template->instantiateIn($cell);
			else if($itemType!==TListItemType::EditItem)
				$cell->setText('&nbsp;');
		}
		else if($itemType===TListItemType::Header)
		{
			if(($classPath=$this->getHeaderRenderer())!=='')
				$this->initializeHeaderCell($cell,$columnIndex);
			else if($this->_headerTemplate!==null)
				$this->_headerTemplate->instantiateIn($cell);
			else
				$this->initializeHeaderCell($cell,$columnIndex);
		}
		else if($itemType===TListItemType::Footer)
		{
			if(($classPath=$this->getFooterRenderer())!=='')
				$this->initializeFooterCell($cell,$columnIndex);
			else if($this->_footerTemplate!==null)
				$this->_footerTemplate->instantiateIn($cell);
			else
				$this->initializeFooterCell($cell,$columnIndex);
		}
	}

	/**
	 * Databinds a cell in the column.
	 * This method is invoked when datagrid performs databinding.
	 * It populates the content of the cell with the relevant data from data source.
	 */
	public function dataBindColumn($sender,$param)
	{
		$item=$sender->getNamingContainer();
		$sender->setData($item->getData());
	}
}