GridHandler::_fixColumnWidths PHP Méthode

    private function _fixColumnWidths()
    {
        $columns =& $this->getColumns();
        $width = 0;
        $noSpecifiedWidthCount = 0;
        // Find the total width and how many columns do not specify their width.
        foreach ($columns as $column) {
            if ($column->hasFlag('width')) {
                $width += $column->getFlag('width');
            } else {
                $noSpecifiedWidthCount++;
            }
        }
        // Four cases: we have to add or remove some width, and either we have wiggle room or not.
        // First case, width less than 100 and some unspecified columns to add it to.
        if ($width < 100) {
            if ($noSpecifiedWidthCount > 0) {
                // We need to add width to columns that did not specify it.
                foreach ($columns as $column) {
                    if (!$column->hasFlag('width')) {
                        $modifyColumn = $this->getColumn($column->getId());
                        $modifyColumn->addFlag('width', round((100 - $width) / $noSpecifiedWidthCount));
                        unset($modifyColumn);
                    }
                }
            }
        }
        // Second case, width higher than 100 and all columns width specified.
        if ($width > 100) {
            if ($noSpecifiedWidthCount == 0) {
                // We need to remove width from all columns equally.
                $columnsToModify = $columns;
                foreach ($columns as $key => $column) {
                    // We don't want to change the indent column widht, so avoid it.
                    if ($column->getId() == 'indent') {
                        unset($columnsToModify[$key]);
                    }
                }
                // Calculate the value to remove from all columns.
                $difference = $width - 100;
                $columnsCount = count($columnsToModify);
                $removeValue = round($difference / $columnsCount);
                foreach ($columnsToModify as $column) {
                    $modifyColumn = $this->getColumn($column->getId());
                    if (end($columnsToModify) === $column) {
                        // Handle rounding problems.
                        $totalWidth = $width - $removeValue * $columnsCount;
                        if ($totalWidth < 100) {
                            $removeValue -= 100 - $totalWidth;
                        }
                    }
                    $modifyColumn->addFlag('width', $modifyColumn->getFlag('width') - $removeValue);
                }
            }
        }
    }