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<?php |
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namespace DNADesign\Elemental\Services; |
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use DNADesign\Elemental\Models\BaseElement; |
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use InvalidArgumentException; |
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use SilverStripe\Core\Convert; |
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use SilverStripe\ORM\DataObject; |
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use SilverStripe\ORM\Queries\SQLUpdate; |
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class ReorderElements |
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{ |
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/** |
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* @var BaseElement |
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*/ |
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protected $element; |
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/** |
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* Create reordering service for specified Element |
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* |
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* @param BaseElement $element |
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*/ |
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public function __construct(BaseElement $element) |
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{ |
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if (!is_subclass_of($element, BaseElement::class)) { |
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throw new InvalidArgumentException(sprintf( |
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'Invalid %s passed to %s, got class %s instead', |
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BaseElement::class, |
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__CLASS__, |
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get_class($element) |
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)); |
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} |
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$this->setElement($element); |
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} |
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/** |
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* Get the Element reordering will be performed on |
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* |
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* @return BaseElement |
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*/ |
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public function getElement() |
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{ |
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return $this->element; |
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} |
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/** |
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* Set the Element instance to perform reordering on |
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* |
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* @param BaseElement $element |
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* @return $this |
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*/ |
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public function setElement(BaseElement $element) |
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{ |
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$this->element = $element; |
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return $this; |
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} |
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/** |
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* Set the ordering of Elements in relation to sibling Elements in the parent {@see ElementalArea} |
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* |
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* @param int $elementToBeAfterID ID of the Element to be ordered after |
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*/ |
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public function reorder($elementToBeAfterID = 0) |
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{ |
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$element = $this->element; |
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$parentId = $element->ParentID; |
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$currentPosition = (int) $element->Sort; |
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$sortAfterPosition = 0; |
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if ($elementToBeAfterID) { |
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/** @var BaseElement $afterBlock */ |
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$afterElement = BaseElement::get()->byID($elementToBeAfterID); |
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if (!$afterElement) { |
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throw new InvalidArgumentException(sprintf( |
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'%s#%s not found', |
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BaseElement::class, |
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$elementToBeAfterID |
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)); |
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} |
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// Must be weak comparison as sometimes integers are returned from the DB as strings |
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if ($afterElement->ParentID != $parentId) { |
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throw new InvalidArgumentException( |
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'Trying to sort element to be placed after an element from a different elemental area' |
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); |
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} |
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$sortAfterPosition = (int) $afterElement->Sort; |
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} |
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// We are updating records with SQL queries to avoid the ORM triggering the creation of new versions |
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// for each element that is affected by this reordering. |
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$tableName = Convert::raw2sql(DataObject::getSchema()->tableName(BaseElement::class)); |
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if ($sortAfterPosition < $currentPosition) { |
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$operator = '+'; |
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$filter = "\"$tableName\".\"Sort\" > $sortAfterPosition AND \"$tableName\".\"Sort\" < $currentPosition"; |
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$newBlockPosition = $sortAfterPosition + 1; |
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} else { |
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$operator = '-'; |
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$filter = "\"$tableName\".\"Sort\" <= $sortAfterPosition AND \"$tableName\".\"Sort\" > $currentPosition"; |
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$newBlockPosition = $sortAfterPosition; |
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} |
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$query = SQLUpdate::create() |
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->setTable("\"$tableName\"") |
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->assignSQL('"Sort"', "\"$tableName\".\"Sort\" $operator 1") |
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->addWhere([$filter, "\"$tableName\".\"ParentID\"" => $parentId]); |
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$query->execute(); |
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// Now use the ORM to write a new version of the record that we are directly reordering |
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$element->Sort = $newBlockPosition; |
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$element->write(); |
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return $element; |
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} |
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} |
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