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<?php
/**
* @package yii2-grid
* @author Kartik Visweswaran <kartikv2@gmail.com>
* @copyright Copyright © Kartik Visweswaran, Krajee.com, 2014 - 2023
* @version 3.5.1
*/
namespace kartik\grid;
use Closure;
use yii\base\InvalidConfigException;
/**
* A FormulaColumn to calculate values based on other column indexes for the Grid widget [[\kartik\grid\GridView]].
* This extends and builds upon the [[DataColumn]] in the [[GridView]] widget.
*
* To add a FormulaColumn to the gridview, add it to the [[GridView::columns|columns]] configuration as follows:
*
* ```php
* 'columns' => [
* // ...
* [
* 'class' => FormulaColumn::class,
* // you may configure additional properties here
* ],
* ]
* ```
*
* @author Kartik Visweswaran <kartikv2@gmail.com>
* @since 1.0
*/
class FormulaColumn extends DataColumn
{
const SUMMARY = -10000;
const FOOTER = -20000;
/**
* @var boolean automatically generate the footer. If set to `true`, it will use the same formula to generate the footer. If set to `false`, will use the default footer.
*/
public $autoFooter = true;
/**
* Gets the value of a column
*
* @param integer $i the index of the grid column (the first column in the grid will be zero indexed). Note a
* column's index is to be considered, even if the `visible` property is set to false.
* @param array $params which will contain these keys:
* - `model`: _yii\base\Model`, the data model being rendered
* - `key`: _string|object_, the key associated with the data model
* - `index`: _integer_, the zero-based index of the data item among the item array returned by
* [[GridView::dataProvider]].
* - widget: _FormulaColumn_, the current column widget instance
*
* @return string
* @throws InvalidConfigException
*/
public function col($i, $params = [])
{
if (empty($this->grid->columns[$i])) {
throw new InvalidConfigException("Invalid column index {$i} used in FormulaColumn.");
}
if (!isset($this->value) || !($this->value instanceof Closure)) {
throw new InvalidConfigException(
"The 'value' must be set and defined as a `Closure` function for a FormulaColumn."
);
}
/** @var DataColumn $col */
$col = $this->grid->columns[$i];
if ($col === $this) {
throw new InvalidConfigException("Self-referencing FormulaColumn at column {$i}.");
}
$model = null;
$key = null;
$index = null;
extract($params);
if ($index == self::SUMMARY) {
return $col->getPageSummaryCellContent();
} elseif ($index == self::FOOTER) {
return $col->getFooterCellContent();
} else {
return $col->getDataCellValue($model, $key, $index);
}
}
/**
* Get the raw footer cell content.
*
* @return string the rendering result
*/
protected function getFooterCellContent()
{
if ($this->autoFooter) {
return call_user_func($this->value, null, self::FOOTER, self::FOOTER, $this);
}
return parent::getFooterCellContent();
}
/**
* Formatted footer cell content.
*
* @return string the rendering result
*/
protected function renderFooterCellContent()
{
if ($this->autoFooter) {
return $this->grid->formatter->format($this->getFooterCellContent(), $this->format);
}
return parent::renderFooterCellContent();
}
}
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