408 lines
10 KiB
PHP
Executable File
408 lines
10 KiB
PHP
Executable File
<?php
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/**
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* Allows grid field rows to be re-ordered via drag and drop. Both normal data
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* lists and many many lists can be ordered.
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*
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* If the grid field has not been sorted, this component will sort the data by
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* the sort field.
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*/
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class GridFieldOrderableRows extends RequestHandler implements
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GridField_ColumnProvider,
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GridField_DataManipulator,
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GridField_HTMLProvider,
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GridField_URLHandler {
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private static $allowed_actions = array(
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'handleReorder',
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'handleMoveToPage'
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);
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/**
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* The database field which specifies the sort, defaults to "Sort".
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*
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* @see setSortField()
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* @var string
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*/
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protected $sortField;
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/**
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* Extra sort fields to apply before the sort field.
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*
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* @see setExtraSortFields()
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* @var string|array
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*/
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protected $extraSortFields = null;
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/**
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* The number of the column containing the reorder handles
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*
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* @see setReorderColumnNumber()
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* @var integer
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*/
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protected $reorderColumnNumber = 0;
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/**
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* @param string $sortField
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*/
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public function __construct($sortField = 'Sort') {
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$this->sortField = $sortField;
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}
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/**
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* @return string
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*/
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public function getSortField() {
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return $this->sortField;
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}
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/**
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* Sets the field used to specify the sort.
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*
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* @param string $sortField
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* @return GridFieldOrderableRows $this
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*/
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public function setSortField($field) {
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$this->sortField = $field;
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return $this;
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}
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/**
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* @return string|array
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*/
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public function getExtraSortFields() {
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return $this->extraSortFields;
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}
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/**
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* Sets extra sort fields to apply before the sort field.
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*
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* @param string|array $fields
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* @return GridFieldOrderableRows $this
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*/
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public function setExtraSortFields($fields) {
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$this->extraSortFields = $fields;
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return $this;
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}
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/**
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* @return integer
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*/
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public function getReorderColumnNumber() {
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return $this->reorderColumnNumber;
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}
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/**
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* Sets the number of the column containing the reorder handles.
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*
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* @param integer $colno
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* @return GridFieldOrderableRows $this
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*/
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public function setReorderColumnNumber($colno) {
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$this->reorderColumnNumber = $colno;
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return $this;
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}
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/**
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* Gets the table which contains the sort field.
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*
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* @param DataList $list
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* @return string
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*/
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public function getSortTable(DataList $list) {
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$field = $this->getSortField();
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if($list instanceof ManyManyList) {
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$extra = $list->getExtraFields();
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$table = $list->getJoinTable();
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if($extra && array_key_exists($field, $extra)) {
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return $table;
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}
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}
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$classes = ClassInfo::dataClassesFor($list->dataClass());
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foreach($classes as $class) {
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if(singleton($class)->hasOwnTableDatabaseField($field)) {
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return $class;
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}
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}
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throw new Exception("Couldn't find the sort field '$field'");
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}
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public function getURLHandlers($grid) {
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return array(
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'POST reorder' => 'handleReorder',
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'POST movetopage' => 'handleMoveToPage'
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);
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}
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/**
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* @param GridField $field
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*/
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public function getHTMLFragments($field) {
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GridFieldExtensions::include_requirements();
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$field->addExtraClass('ss-gridfield-orderable');
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$field->setAttribute('data-url-reorder', $field->Link('reorder'));
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$field->setAttribute('data-url-movetopage', $field->Link('movetopage'));
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}
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public function augmentColumns($grid, &$cols) {
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if(!in_array('Reorder', $cols) && $grid->getState()->GridFieldOrderableRows->enabled) {
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array_splice($cols, $this->reorderColumnNumber, 0, 'Reorder');
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}
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}
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public function getColumnsHandled($grid) {
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return array('Reorder');
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}
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public function getColumnContent($grid, $record, $col) {
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return ViewableData::create()->renderWith('GridFieldOrderableRowsDragHandle');
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}
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public function getColumnAttributes($grid, $record, $col) {
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return array('class' => 'col-reorder');
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}
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public function getColumnMetadata($grid, $col) {
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return array('title' => '');
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}
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public function getManipulatedData(GridField $grid, SS_List $list) {
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$state = $grid->getState();
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$sorted = (bool) ((string) $state->GridFieldSortableHeader->SortColumn);
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// If the data has not been sorted by the user, then sort it by the
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// sort column, otherwise disable reordering.
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$state->GridFieldOrderableRows->enabled = !$sorted;
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if(!$sorted) {
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$sortterm = '';
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if ($this->extraSortFields) {
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if (is_array($this->extraSortFields)) {
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foreach($this->extraSortFields as $col => $dir) {
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$sortterm .= "$col $dir, ";
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}
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} else {
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$sortterm = $this->extraSortFields.', ';
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}
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}
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$sortterm .= $this->sortTerm($list);
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return $list->sort($sortterm);
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} else {
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return $list;
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}
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}
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/**
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* Handles requests to reorder a set of IDs in a specific order.
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*/
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public function handleReorder($grid, $request) {
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$list = $grid->getList();
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$modelClass = $grid->getModelClass();
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if ($list instanceof ManyManyList && !singleton($modelClass)->canView()) {
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$this->httpError(403);
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} else if(!($list instanceof ManyManyList) && !singleton($modelClass)->canEdit()) {
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$this->httpError(403);
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}
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$ids = $request->postVar('order');
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$field = $this->getSortField();
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if(!is_array($ids)) {
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$this->httpError(400);
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}
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$sortterm = '';
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if ($this->extraSortFields) {
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if (is_array($this->extraSortFields)) {
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foreach($this->extraSortFields as $col => $dir) {
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$sortterm .= "$col $dir, ";
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}
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} else {
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$sortterm = $this->extraSortFields.', ';
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}
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}
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$sortterm .= $this->sortTerm($list);
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$items = $list->filter('ID', $ids)->sort($sortterm);
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// Ensure that each provided ID corresponded to an actual object.
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if(count($items) != count($ids)) {
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$this->httpError(404);
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}
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// Populate each object we are sorting with a sort value.
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$this->populateSortValues($items);
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// Generate the current sort values.
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if ($items instanceof ManyManyList)
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{
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$current = array();
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foreach ($items->toArray() as $record)
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{
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// NOTE: _SortColumn0 is the first ->sort() field
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// used by SS when functions are detected in a SELECT
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// or CASE WHEN.
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if (isset($record->_SortColumn0)) {
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$current[$record->ID] = $record->_SortColumn0;
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} else {
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$current[$record->ID] = $record->$field;
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}
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}
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}
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else
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{
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$current = $items->map('ID', $field)->toArray();
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}
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// Perform the actual re-ordering.
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$this->reorderItems($list, $current, $ids);
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return $grid->FieldHolder();
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}
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/**
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* Get a compatible sort term, taking into account DBs and their ANSI ness
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*
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* @see https://github.com/silverstripe-australia/silverstripe-gridfieldextensions/issues/98
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*/
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protected function sortTerm($list) {
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// need to handle ANSI escaping for DBs differently from other list types
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if ($list instanceof DataList) {
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return '"'.$this->getSortTable($list).'"."'.$this->getSortField().'"';
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}
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return $this->getSortTable($list).'.'.$this->getSortField();
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}
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/**
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* Handles requests to move an item to the previous or next page.
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*/
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public function handleMoveToPage(GridField $grid, $request) {
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if(!$paginator = $grid->getConfig()->getComponentByType('GridFieldPaginator')) {
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$this->httpError(404, 'Paginator component not found');
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}
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$move = $request->postVar('move');
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$field = $this->getSortField();
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$list = $grid->getList();
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$manip = $grid->getManipulatedList();
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$existing = $manip->map('ID', $field)->toArray();
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$values = $existing;
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$order = array();
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$id = isset($move['id']) ? (int) $move['id'] : null;
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$to = isset($move['page']) ? $move['page'] : null;
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if(!isset($values[$id])) {
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$this->httpError(400, 'Invalid item ID');
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}
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$this->populateSortValues($list);
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$page = ((int) $grid->getState()->GridFieldPaginator->currentPage) ?: 1;
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$per = $paginator->getItemsPerPage();
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if($to == 'prev') {
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$swap = $list->limit(1, ($page - 1) * $per - 1)->first();
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$values[$swap->ID] = $swap->$field;
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$order[] = $id;
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$order[] = $swap->ID;
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foreach($existing as $_id => $sort) {
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if($id != $_id) $order[] = $_id;
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}
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} elseif($to == 'next') {
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$swap = $list->limit(1, $page * $per)->first();
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$values[$swap->ID] = $swap->$field;
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foreach($existing as $_id => $sort) {
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if($id != $_id) $order[] = $_id;
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}
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$order[] = $swap->ID;
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$order[] = $id;
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} else {
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$this->httpError(400, 'Invalid page target');
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}
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$this->reorderItems($list, $values, $order);
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return $grid->FieldHolder();
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}
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protected function reorderItems($list, array $values, array $order) {
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// Get a list of sort values that can be used.
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$pool = array_values($values);
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sort($pool);
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// Loop through each item, and update the sort values which do not
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// match to order the objects.
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foreach(array_values($order) as $pos => $id) {
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if($values[$id] != $pool[$pos]) {
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DB::query(sprintf(
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'UPDATE "%s" SET "%s" = %d WHERE %s',
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$this->getSortTable($list),
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$this->getSortField(),
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$pool[$pos],
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$this->getSortTableClauseForIds($list, $id)
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));
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}
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}
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}
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protected function populateSortValues(DataList $list) {
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$list = clone $list;
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$field = $this->getSortField();
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$table = $this->getSortTable($list);
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$clause = sprintf('"%s"."%s" = 0', $table, $this->getSortField());
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foreach($list->where($clause)->column('ID') as $id) {
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$max = DB::query(sprintf('SELECT MAX("%s") + 1 FROM "%s"', $field, $table));
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$max = $max->value();
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DB::query(sprintf(
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'UPDATE "%s" SET "%s" = %d WHERE %s',
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$table,
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$field,
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$max,
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$this->getSortTableClauseForIds($list, $id)
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));
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}
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}
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protected function getSortTableClauseForIds(DataList $list, $ids) {
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if(is_array($ids)) {
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$value = 'IN (' . implode(', ', array_map('intval', $ids)) . ')';
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} else {
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$value = '= ' . (int) $ids;
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}
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if($list instanceof ManyManyList) {
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$extra = $list->getExtraFields();
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$key = $list->getLocalKey();
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$foreignKey = $list->getForeignKey();
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$foreignID = (int) $list->getForeignID();
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if($extra && array_key_exists($this->getSortField(), $extra)) {
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return sprintf(
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'"%s" %s AND "%s" = %d',
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$key,
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$value,
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$foreignKey,
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$foreignID
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);
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}
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}
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return "\"ID\" $value";
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}
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}
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