<?php
/**
 * TStyle 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\TPropertyValue;
use Prado\Exceptions\TInvalidDataValueException;

/**
 * TTableStyle class.
 * TTableStyle represents the CSS style specific for HTML table.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package Prado\Web\UI\WebControls
 * @since 3.0
 */
class TTableStyle extends TStyle
{
	/**
	 * @var TVerticalAlign the URL of the background image for the table
	 */
	private $_backImageUrl=null;
	/**
	 * @var THorizontalAlign horizontal alignment of the contents within the table
	 */
	private $_horizontalAlign=null;
	/**
	 * @var integer cellpadding of the table
	 */
	private $_cellPadding=null;
	/**
	 * @var integer cellspacing of the table
	 */
	private $_cellSpacing=null;
	/**
	 * @var TTableGridLines grid line setting of the table
	 */
	private $_gridLines=null;
	/**
	 * @var boolean whether the table border should be collapsed
	 */
	private $_borderCollapse=null;

	/**
	 * Sets the style attributes to default values.
	 * This method overrides the parent implementation by
	 * resetting additional TTableStyle specific attributes.
	 */
	public function reset()
	{
		$this->_backImageUrl=null;
		$this->_horizontalAlign=null;
		$this->_cellPadding=null;
		$this->_cellSpacing=null;
		$this->_gridLines=null;
		$this->_borderCollapse=null;
	}

	/**
	 * Copies the fields in a new style to this style.
	 * If a style field is set in the new style, the corresponding field
	 * in this style will be overwritten.
	 * @param TStyle the new style
	 */
	public function copyFrom($style)
	{
		parent::copyFrom($style);
		if($style instanceof TTableStyle)
		{
			if($style->_backImageUrl!==null)
				$this->_backImageUrl=$style->_backImageUrl;
			if($style->_horizontalAlign!==null)
				$this->_horizontalAlign=$style->_horizontalAlign;
			if($style->_cellPadding!==null)
				$this->_cellPadding=$style->_cellPadding;
			if($style->_cellSpacing!==null)
				$this->_cellSpacing=$style->_cellSpacing;
			if($style->_gridLines!==null)
				$this->_gridLines=$style->_gridLines;
			if($style->_borderCollapse!==null)
				$this->_borderCollapse=$style->_borderCollapse;
		}
	}

	/**
	 * Merges the style with a new one.
	 * If a style field is not set in this style, it will be overwritten by
	 * the new one.
	 * @param TStyle the new style
	 */
	public function mergeWith($style)
	{
		parent::mergeWith($style);
		if($style instanceof TTableStyle)
		{
			if($this->_backImageUrl===null && $style->_backImageUrl!==null)
				$this->_backImageUrl=$style->_backImageUrl;
			if($this->_horizontalAlign===null && $style->_horizontalAlign!==null)
				$this->_horizontalAlign=$style->_horizontalAlign;
			if($this->_cellPadding===null && $style->_cellPadding!==null)
				$this->_cellPadding=$style->_cellPadding;
			if($this->_cellSpacing===null && $style->_cellSpacing!==null)
				$this->_cellSpacing=$style->_cellSpacing;
			if($this->_gridLines===null && $style->_gridLines!==null)
				$this->_gridLines=$style->_gridLines;
			if($this->_borderCollapse===null && $style->_borderCollapse!==null)
				$this->_borderCollapse=$style->_borderCollapse;
		}
	}


	/**
	 * Adds attributes related to CSS styles to renderer.
	 * This method overrides the parent implementation.
	 * @param THtmlWriter the writer used for the rendering purpose
	 */
	public function addAttributesToRender($writer)
	{
		if(($url=trim($this->getBackImageUrl()))!=='')
			$writer->addStyleAttribute('background-image','url('.$url.')');

		if(($horizontalAlign=$this->getHorizontalAlign())!==THorizontalAlign::NotSet)
			$writer->addStyleAttribute('text-align',strtolower($horizontalAlign));

		if(($cellPadding=$this->getCellPadding())>=0)
			$writer->addAttribute('cellpadding',"$cellPadding");

		if(($cellSpacing=$this->getCellSpacing())>=0)
			$writer->addAttribute('cellspacing',"$cellSpacing");

		if($this->getBorderCollapse())
			$writer->addStyleAttribute('border-collapse','collapse');

		switch($this->getGridLines())
		{
			case TTableGridLines::Horizontal : $writer->addAttribute('rules','rows'); break;
			case TTableGridLines::Vertical : $writer->addAttribute('rules','cols'); break;
			case TTableGridLines::Both : $writer->addAttribute('rules','all'); break;
		}

		parent::addAttributesToRender($writer);
	}

	/**
	 * @return string the URL of the background image for the table
	 */
	public function getBackImageUrl()
	{
		return $this->_backImageUrl===null?'':$this->_backImageUrl;
	}

	/**
	 * Sets the URL of the background image for the table
	 * @param string the URL
	 */
	public function setBackImageUrl($value)
	{
		$this->_backImageUrl=$value;
	}

	/**
	 * @return THorizontalAlign the horizontal alignment of the contents within the table, defaults to THorizontalAlign::NotSet.
	 */
	public function getHorizontalAlign()
	{
		return $this->_horizontalAlign===null?THorizontalAlign::NotSet:$this->_horizontalAlign;
	}

	/**
	 * Sets the horizontal alignment of the contents within the table.
	 * @param THorizontalAlign the horizontal alignment
	 */
	public function setHorizontalAlign($value)
	{
		$this->_horizontalAlign=TPropertyValue::ensureEnum($value,'THorizontalAlign');
	}

	/**
	 * @return integer cellpadding of the table. Defaults to -1, meaning not set.
	 */
	public function getCellPadding()
	{
		return $this->_cellPadding===null?-1:$this->_cellPadding;
	}

	/**
	 * @param integer cellpadding of the table. A value equal to -1 clears up the setting.
	 * @throws TInvalidDataValueException if the value is less than -1.
	 */
	public function setCellPadding($value)
	{
		if(($this->_cellPadding=TPropertyValue::ensureInteger($value))<-1)
			throw new TInvalidDataValueException('tablestyle_cellpadding_invalid');
	}

	/**
	 * @return integer cellspacing of the table. Defaults to -1, meaning not set.
	 */
	public function getCellSpacing()
	{
		return $this->_cellSpacing===null?-1:$this->_cellSpacing;
	}

	/**
	 * @param integer cellspacing of the table. A value equal to -1 clears up the setting.
	 * @throws TInvalidDataValueException if the value is less than -1.
	 */
	public function setCellSpacing($value)
	{
		if(($this->_cellSpacing=TPropertyValue::ensureInteger($value))<-1)
			throw new TInvalidDataValueException('tablestyle_cellspacing_invalid');
	}

	/**
	 * @return TTableGridLines the grid line setting of the table. Defaults to TTableGridLines::None.
	 */
	public function getGridLines()
	{
		return $this->_gridLines===null?TTableGridLines::None:$this->_gridLines;
	}

	/**
	 * Sets the grid line style of the table.
	 * @param TTableGridLines the grid line setting of the table
	 */
	public function setGridLines($value)
	{
		$this->_gridLines=TPropertyValue::ensureEnum($value,'Prado\\Web\\UI\\WebControls\\TTableGridLines');
	}


	/**
	 * @return boolean whether the table borders should be collapsed. Defaults to false.
	 */
	public function getBorderCollapse()
	{
		return $this->_borderCollapse===null?false:$this->_borderCollapse;
	}

	/**
	 * @param boolean whether the table borders should be collapsed.
	 */
	public function setBorderCollapse($value)
	{
		$this->_borderCollapse=TPropertyValue::ensureBoolean($value);
	}
}