<?php

Prado::using('System.Web.UI.ActiveControls.*');

class Issue516 extends TPage
{
	private $_data=null;

	protected function getData()
	{
		if($this->_data===null)
			$this->loadData();
		return $this->_data;
	}

	protected function loadData()
	{
		// We use viewstate keep track of data.
		// In real applications, data should come from database using an SQL SELECT statement.
		// In the following tabular data, field 'ISBN' is the primary key.
		// All update and delete operations should come with an 'id' value in order to go through.
		if(($this->_data=$this->getViewState('Data',null))===null)
		{
			$this->_data=array(
				array(
					'ISBN'=>'0596007124',
					'title'=>'',
				),
				array(
					'ISBN'=>'0201633612',
					'title'=>'Design Patterns: Elements of Reusable Object-Oriented Software',
				),
				array(
					'ISBN'=>'0321247140',
					'title'=>'Design Patterns Explained : A New Perspective on Object-Oriented Design',
				),
				array(
					'ISBN'=>'0201485672',
					'title'=>'Refactoring: Improving the Design of Existing Code',
				),
				array(
					'ISBN'=>'0321213351',
					'title'=>'Refactoring to Patterns',
				),
				array(
					'ISBN'=>'0735619670',
					'title'=>'Code Complete',
				),
				array(
					'ISBN'=>'0321278658 ',
					'title'=>'Extreme Programming Explained : Embrace Change',
				),
			);
			$this->saveData();
		}
	}

	protected function saveData()
	{
		$this->setViewState('Data',$this->_data);
	}

	protected function updateBook($isbn,$title)
	{
		// In real applications, data should be saved to database using an SQL UPDATE statement
		if($this->_data===null)
			$this->loadData();
		$updateRow=null;
		foreach($this->_data as $index=>$row)
			if($row['ISBN']===$isbn)
				$updateRow=&$this->_data[$index];
		if($updateRow!==null)
		{
			$updateRow['title']=$title;
			$this->saveData();
		}
	}

	public function onLoad($param)
	{
		parent::onLoad($param);
		if(!$this->IsPostBack && !$this->IsCallBack)
		{
			$this->DataGrid->DataSource=$this->Data;
			$this->DataGrid->dataBind();
		}
	}

	public function editItem($sender,$param)
	{
		$this->DataGrid->EditItemIndex=$param->Item->ItemIndex;
		$this->DataGrid->DataSource=$this->Data;
		$this->DataGrid->dataBind();
	}

	public function saveItem($sender,$param)
	{
		$item=$param->Item;
		$this->updateBook(
			$this->DataGrid->DataKeys[$item->ItemIndex],    // ISBN
			$item->BookTitleColumn->TextBox->Text           // title
			);
		$this->DataGrid->EditItemIndex=-1;
		$this->DataGrid->DataSource=$this->Data;
		$this->DataGrid->dataBind();
	}

	public function cancelItem($sender,$param)
	{
		$this->DataGrid->EditItemIndex=-1;
		$this->DataGrid->DataSource=$this->Data;
		$this->DataGrid->dataBind();
	}

}