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<?php
/**
 * @link https://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license https://www.yiiframework.com/license/
 */

namespace yii\grid;

use Closure;
use yii\base\Model;
use yii\data\ActiveDataProvider;
use yii\data\ArrayDataProvider;
use yii\db\ActiveQueryInterface;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;
use yii\helpers\Inflector;

/**
 * DataColumn is the default column type for the [[GridView]] widget.
 *
 * It is used to show data columns and allows [[enableSorting|sorting]] and [[filter|filtering]] them.
 *
 * A simple data column definition refers to an attribute in the data model of the
 * GridView's data provider. The name of the attribute is specified by [[attribute]].
 *
 * By setting [[value]] and [[label]], the header and cell content can be customized.
 *
 * A data column differentiates between the [[getDataCellValue|data cell value]] and the
 * [[renderDataCellContent|data cell content]]. The cell value is an un-formatted value that
 * may be used for calculation, while the actual cell content is a [[format|formatted]] version of that
 * value which may contain HTML markup.
 *
 * For more details and usage information on DataColumn, see the [guide article on data widgets](guide:output-data-widgets).
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class DataColumn extends Column
{
    /**
     * @var string the attribute name associated with this column. When neither [[content]] nor [[value]]
     * is specified, the value of the specified attribute will be retrieved from each data model and displayed.
     *
     * Also, if [[label]] is not specified, the label associated with the attribute will be displayed.
     */
    public $attribute;
    /**
     * @var string|null label to be displayed in the [[header|header cell]] and also to be used as the sorting
     * link label when sorting is enabled for this column.
     * If it is not set and the models provided by the GridViews data provider are instances
     * of [[\yii\db\ActiveRecord]], the label will be determined using [[\yii\db\ActiveRecord::getAttributeLabel()]].
     * Otherwise [[\yii\helpers\Inflector::camel2words()]] will be used to get a label.
     */
    public $label;
    /**
     * @var bool whether the header label should be HTML-encoded.
     * @see label
     * @since 2.0.1
     */
    public $encodeLabel = true;
    /**
     * @var string|Closure|null an anonymous function or a string that is used to determine the value to display in the current column.
     *
     * If this is an anonymous function, it will be called for each row and the return value will be used as the value to
     * display for every data model. The signature of this function should be: `function ($model, $key, $index, $column)`.
     * Where `$model`, `$key`, and `$index` refer to the model, key and index of the row currently being rendered
     * and `$column` is a reference to the [[DataColumn]] object.
     *
     * You may also set this property to a string representing the attribute name to be displayed in this column.
     * This can be used when the attribute to be displayed is different from the [[attribute]] that is used for
     * sorting and filtering.
     *
     * If this is not set, `$model[$attribute]` will be used to obtain the value, where `$attribute` is the value of [[attribute]].
     */
    public $value;
    /**
     * @var string|array|Closure in which format should the value of each data model be displayed as (e.g. `"raw"`, `"text"`, `"html"`,
     * `['date', 'php:Y-m-d']`). Supported formats are determined by the [[GridView::formatter|formatter]] used by
     * the [[GridView]]. Default format is "text" which will format the value as an HTML-encoded plain text when
     * [[\yii\i18n\Formatter]] is used as the [[GridView::$formatter|formatter]] of the GridView.
     * @see \yii\i18n\Formatter::format()
     */
    public $format = 'text';
    /**
     * @var bool whether to allow sorting by this column. If true and [[attribute]] is found in
     * the sort definition of [[GridView::dataProvider]], then the header cell of this column
     * will contain a link that may trigger the sorting when being clicked.
     */
    public $enableSorting = true;
    /**
     * @var array the HTML attributes for the link tag in the header cell
     * generated by [[\yii\data\Sort::link]] when sorting is enabled for this column.
     * @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
     */
    public $sortLinkOptions = [];
    /**
     * @var string|array|null|false the HTML code representing a filter input (e.g. a text field, a dropdown list)
     * that is used for this data column. This property is effective only when [[GridView::filterModel]] is set.
     *
     * - If this property is not set, a text field will be generated as the filter input with attributes defined
     *   with [[filterInputOptions]]. See [[\yii\helpers\BaseHtml::activeInput]] for details on how an active
     *   input tag is generated.
     * - If this property is an array, a dropdown list will be generated that uses this property value as
     *   the list options.
     * - If you don't want a filter for this data column, set this value to be false.
     */
    public $filter;
    /**
     * @var array the HTML attributes for the filter input fields. This property is used in combination with
     * the [[filter]] property. When [[filter]] is not set or is an array, this property will be used to
     * render the HTML attributes for the generated filter input fields.
     *
     * Empty `id` in the default value ensures that id would not be obtained from the model attribute thus
     * providing better performance.
     *
     * @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
     */
    public $filterInputOptions = ['class' => 'form-control', 'id' => null];
    /**
     * @var string|null the attribute name of the [[GridView::filterModel]] associated with this column. If not set,
     * will have the same value as [[attribute]].
     * @since 2.0.41
     */
    public $filterAttribute;


    /**
     * {@inheritdoc}
     */
    public function init()
    {
        parent::init();
        if($this->filterAttribute === null) {
            $this->filterAttribute = $this->attribute;
        }
    }

    /**
     * {@inheritdoc}
     */
    protected function renderHeaderCellContent()
    {
        if ($this->header !== null || $this->label === null && $this->attribute === null) {
            return parent::renderHeaderCellContent();
        }

        $label = $this->getHeaderCellLabel();
        if ($this->encodeLabel) {
            $label = Html::encode($label);
        }

        if ($this->attribute !== null && $this->enableSorting &&
            ($sort = $this->grid->dataProvider->getSort()) !== false && $sort->hasAttribute($this->attribute)) {
            return $sort->link($this->attribute, array_merge($this->sortLinkOptions, ['label' => $label]));
        }

        return $label;
    }

    /**
     * {@inheritdoc}
     * @since 2.0.8
     */
    protected function getHeaderCellLabel()
    {
        $provider = $this->grid->dataProvider;

        if ($this->label === null) {
            if ($this->attribute === null) {
                $label = '';
            } elseif ($provider instanceof ActiveDataProvider && $provider->query instanceof ActiveQueryInterface) {
                /* @var $modelClass Model */
                $modelClass = $provider->query->modelClass;
                $model = $modelClass::instance();
                $label = $model->getAttributeLabel($this->attribute);
            } elseif ($provider instanceof ArrayDataProvider && $provider->modelClass !== null) {
                /* @var $modelClass Model */
                $modelClass = $provider->modelClass;
                $model = $modelClass::instance();
                $label = $model->getAttributeLabel($this->attribute);
            } elseif ($this->grid->filterModel !== null && $this->grid->filterModel instanceof Model) {
                $label = $this->grid->filterModel->getAttributeLabel($this->filterAttribute);
            } else {
                $models = $provider->getModels();
                if (($model = reset($models)) instanceof Model) {
                    /* @var $model Model */
                    $label = $model->getAttributeLabel($this->attribute);
                } else {
                    $label = Inflector::camel2words($this->attribute);
                }
            }
        } else {
            $label = $this->label;
        }

        return $label;
    }

    /**
     * {@inheritdoc}
     */
    protected function renderFilterCellContent()
    {
        if (is_string($this->filter)) {
            return $this->filter;
        }

        $model = $this->grid->filterModel;

        if ($this->filter !== false && $model instanceof Model && $this->filterAttribute !== null && $model->isAttributeActive($this->filterAttribute)) {
            if ($model->hasErrors($this->filterAttribute)) {
                Html::addCssClass($this->filterOptions, 'has-error');
                $error = ' ' . Html::error($model, $this->filterAttribute, $this->grid->filterErrorOptions);
            } else {
                $error = '';
            }
            if (is_array($this->filter)) {
                $options = array_merge(['prompt' => ''], $this->filterInputOptions);
                return Html::activeDropDownList($model, $this->filterAttribute, $this->filter, $options) . $error;
            } elseif ($this->format === 'boolean') {
                $options = array_merge(['prompt' => ''], $this->filterInputOptions);
                return Html::activeDropDownList($model, $this->filterAttribute, [
                    1 => $this->grid->formatter->booleanFormat[1],
                    0 => $this->grid->formatter->booleanFormat[0],
                ], $options) . $error;
            }
            $options = array_merge(['maxlength' => true], $this->filterInputOptions);

            return Html::activeTextInput($model, $this->filterAttribute, $options) . $error;
        }

        return parent::renderFilterCellContent();
    }

    /**
     * Returns the data cell value.
     * @param mixed $model the data model
     * @param mixed $key the key associated with the data model
     * @param int $index the zero-based index of the data model among the models array returned by [[GridView::dataProvider]].
     * @return string the data cell value
     */
    public function getDataCellValue($model, $key, $index)
    {
        if ($this->value !== null) {
            if (is_string($this->value)) {
                return ArrayHelper::getValue($model, $this->value);
            }

            return call_user_func($this->value, $model, $key, $index, $this);
        } elseif ($this->attribute !== null) {
            return ArrayHelper::getValue($model, $this->attribute);
        }

        return null;
    }

    /**
     * {@inheritdoc}
     */
    protected function renderDataCellContent($model, $key, $index)
    {
        if ($this->content === null) {
            return $this->grid->formatter->format($this->getDataCellValue($model, $key, $index), $this->format);
        }

        return parent::renderDataCellContent($model, $key, $index);
    }
}
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