skeeks\cms\grid\BooleanColumn::getDataCellValue PHP Method

    public function getDataCellValue($model, $key, $index)
    {
        $value = parent::getDataCellValue($model, $key, $index);
        if ($this->trueValue !== true) {
            if ($value == $this->falseValue) {
                return $this->falseIcon;
            } else {
                return $this->trueIcon;
            }
        } else {
            if ($value !== null) {
                return $value ? $this->trueIcon : $this->falseIcon;
            }
            return $this->showNullAsFalse ? $this->falseIcon : $value;
        }
    }