From 9e3e51ebe29663b502342562338955370cf9a152 Mon Sep 17 00:00:00 2001
From: Peter Thaleikis <petert@catalyst.net.nz>
Date: Mon, 21 Sep 2015 22:49:02 +1200
Subject: [PATCH] changing from windows line endings to linux line endings

---
 code/GridFieldAddExistingSearchButton.php  | 198 ++---
 code/GridFieldAddExistingSearchHandler.php | 218 +++---
 code/GridFieldAddNewMultiClass.php         |   6 +-
 code/GridFieldOrderableRows.php            | 806 ++++++++++-----------
 4 files changed, 614 insertions(+), 614 deletions(-)

diff --git a/code/GridFieldAddExistingSearchButton.php b/code/GridFieldAddExistingSearchButton.php
index ee9f782..78638a2 100755
--- a/code/GridFieldAddExistingSearchButton.php
+++ b/code/GridFieldAddExistingSearchButton.php
@@ -1,99 +1,99 @@
-<?php
-/**
- * A modal search dialog which uses search context to search for and add
- * existing records to a grid field.
- */
-class GridFieldAddExistingSearchButton implements
-	GridField_HTMLProvider,
-	GridField_URLHandler {
-
-	private static $allowed_actions = array(
-		'handleSearch'
-	);
-
-	protected $title;
-	protected $fragment;
-	protected $searchList;
-
-	/**
-	 * @param string $fragment
-	 */
-	public function __construct($fragment = 'buttons-before-left') {
-		$this->fragment = $fragment;
-		$this->title    = _t('GridFieldExtensions.ADDEXISTING', 'Add Existing');
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getTitle() {
-		return $this->title;
-	}
-
-	/**
-	 * @param string $title
-	 * @return GridFieldAddExistingSearchButton $this
-	 */
-	public function setTitle($title) {
-		$this->title = $title;
-		return $this;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getFragment() {
-		return $this->fragment;
-	}
-
-	/**
-	 * @param string $fragment
-	 * @return GridFieldAddExistingSearchButton $this
-	 */
-	public function setFragment($fragment) {
-		$this->fragment = $fragment;
-		return $this;
-	}
-
-	/**
-	 * Sets a custom list to use to provide the searchable items.
-	 *
-	 * @param SS_List $list
-	 * @return GridFieldAddExistingSearchButton $this
-	 */
-	public function setSearchList(SS_List $list) {
-		$this->searchList = $list;
-		return $this;
-	}
-
-	/**
-	 * @return SS_List|null
-	 */
-	public function getSearchList() {
-		return $this->searchList;
-	}
-
-	public function getHTMLFragments($grid) {
-		GridFieldExtensions::include_requirements();
-
-		$data = new ArrayData(array(
-			'Title' => $this->getTitle(),
-			'Link'  => $grid->Link('add-existing-search')
-		));
-
-		return array(
-			$this->fragment => $data->renderWith('GridFieldAddExistingSearchButton'),
-		);
-	}
-
-	public function getURLHandlers($grid) {
-		return array(
-			'add-existing-search' => 'handleSearch'
-		);
-	}
-
-	public function handleSearch($grid, $request) {
-		return new GridFieldAddExistingSearchHandler($grid, $this);
-	}
-
-}
+<?php
+/**
+ * A modal search dialog which uses search context to search for and add
+ * existing records to a grid field.
+ */
+class GridFieldAddExistingSearchButton implements
+	GridField_HTMLProvider,
+	GridField_URLHandler {
+
+	private static $allowed_actions = array(
+		'handleSearch'
+	);
+
+	protected $title;
+	protected $fragment;
+	protected $searchList;
+
+	/**
+	 * @param string $fragment
+	 */
+	public function __construct($fragment = 'buttons-before-left') {
+		$this->fragment = $fragment;
+		$this->title    = _t('GridFieldExtensions.ADDEXISTING', 'Add Existing');
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getTitle() {
+		return $this->title;
+	}
+
+	/**
+	 * @param string $title
+	 * @return GridFieldAddExistingSearchButton $this
+	 */
+	public function setTitle($title) {
+		$this->title = $title;
+		return $this;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getFragment() {
+		return $this->fragment;
+	}
+
+	/**
+	 * @param string $fragment
+	 * @return GridFieldAddExistingSearchButton $this
+	 */
+	public function setFragment($fragment) {
+		$this->fragment = $fragment;
+		return $this;
+	}
+
+	/**
+	 * Sets a custom list to use to provide the searchable items.
+	 *
+	 * @param SS_List $list
+	 * @return GridFieldAddExistingSearchButton $this
+	 */
+	public function setSearchList(SS_List $list) {
+		$this->searchList = $list;
+		return $this;
+	}
+
+	/**
+	 * @return SS_List|null
+	 */
+	public function getSearchList() {
+		return $this->searchList;
+	}
+
+	public function getHTMLFragments($grid) {
+		GridFieldExtensions::include_requirements();
+
+		$data = new ArrayData(array(
+			'Title' => $this->getTitle(),
+			'Link'  => $grid->Link('add-existing-search')
+		));
+
+		return array(
+			$this->fragment => $data->renderWith('GridFieldAddExistingSearchButton'),
+		);
+	}
+
+	public function getURLHandlers($grid) {
+		return array(
+			'add-existing-search' => 'handleSearch'
+		);
+	}
+
+	public function handleSearch($grid, $request) {
+		return new GridFieldAddExistingSearchHandler($grid, $this);
+	}
+
+}
diff --git a/code/GridFieldAddExistingSearchHandler.php b/code/GridFieldAddExistingSearchHandler.php
index 124818a..8175de3 100644
--- a/code/GridFieldAddExistingSearchHandler.php
+++ b/code/GridFieldAddExistingSearchHandler.php
@@ -1,109 +1,109 @@
-<?php
-/**
- * Used by {@link GridFieldAddExistingSearchButton} to provide the searching
- * functionality.
- */
-class GridFieldAddExistingSearchHandler extends RequestHandler {
-
-	private static $allowed_actions = array(
-		'index',
-		'add',
-		'SearchForm'
-	);
-
-	/**
-	 * @var GridField
-	 */
-	protected $grid;
-
-	/**
-	 * @var GridFieldAddExistingSearchButton
-	 */
-	protected $button;
-
-	/**
-	 * @var SearchContext
-	 */
-	protected $context;
-
-	public function __construct($grid, $button) {
-		$this->grid    = $grid;
-		$this->button  = $button;
-		$this->context = singleton($grid->getModelClass())->getDefaultSearchContext();
-
-		parent::__construct();
-	}
-
-	public function index() {
-		return $this->renderWith('GridFieldAddExistingSearchHandler');
-	}
-
-	public function add($request) {
-		if(!$id = $request->postVar('id')) {
-			$this->httpError(400);
-		}
-
-		$list = $this->grid->getList();
-		$item = DataList::create($list->dataClass())->byID($id);
-
-		if(!$item) {
-			$this->httpError(400);
-		}
-
-		$list->add($item);
-	}
-
-	/**
-	 * @return Form
-	 */
-	public function SearchForm() {
-		$form = new Form(
-			$this,
-			'SearchForm',
-			$this->context->getFields(),
-			new FieldList(
-				FormAction::create('doSearch', _t('GridFieldExtensions.SEARCH', 'Search'))
-					->setUseButtonTag(true)
-					->addExtraClass('ss-ui-button')
-					->setAttribute('data-icon', 'magnifier')
-			)
-		);
-
-		$form->addExtraClass('stacked add-existing-search-form');
-		$form->setFormMethod('GET');
-
-		return $form;
-	}
-
-	public function doSearch($data, $form) {
-		$list = $this->context->getQuery($data, false, false, $this->getSearchList());
-		$list = $list->subtract($this->grid->getList());
-		$list = new PaginatedList($list, $this->request);
-
-		$data = $this->customise(array(
-			'SearchForm' => $form,
-			'Items'      => $list
-		));
-		return $data->index();
-	}
-
-	public function Items() {
-		$list = $this->getSearchList();
-		$list = $list->subtract($this->grid->getList());
-		$list = new PaginatedList($list, $this->request);
-
-		return $list;
-	}
-
-	public function Link($action = null) {
-		return Controller::join_links($this->grid->Link(), 'add-existing-search', $action);
-	}
-
-	/**
-	 * @return DataList
-	 */
-	protected function getSearchList() {
-		return $this->button->getSearchList() ?: DataList::create($this->grid->getList()->dataClass());
-	}
-
-}
+<?php
+/**
+ * Used by {@link GridFieldAddExistingSearchButton} to provide the searching
+ * functionality.
+ */
+class GridFieldAddExistingSearchHandler extends RequestHandler {
+
+	private static $allowed_actions = array(
+		'index',
+		'add',
+		'SearchForm'
+	);
+
+	/**
+	 * @var GridField
+	 */
+	protected $grid;
+
+	/**
+	 * @var GridFieldAddExistingSearchButton
+	 */
+	protected $button;
+
+	/**
+	 * @var SearchContext
+	 */
+	protected $context;
+
+	public function __construct($grid, $button) {
+		$this->grid    = $grid;
+		$this->button  = $button;
+		$this->context = singleton($grid->getModelClass())->getDefaultSearchContext();
+
+		parent::__construct();
+	}
+
+	public function index() {
+		return $this->renderWith('GridFieldAddExistingSearchHandler');
+	}
+
+	public function add($request) {
+		if(!$id = $request->postVar('id')) {
+			$this->httpError(400);
+		}
+
+		$list = $this->grid->getList();
+		$item = DataList::create($list->dataClass())->byID($id);
+
+		if(!$item) {
+			$this->httpError(400);
+		}
+
+		$list->add($item);
+	}
+
+	/**
+	 * @return Form
+	 */
+	public function SearchForm() {
+		$form = new Form(
+			$this,
+			'SearchForm',
+			$this->context->getFields(),
+			new FieldList(
+				FormAction::create('doSearch', _t('GridFieldExtensions.SEARCH', 'Search'))
+					->setUseButtonTag(true)
+					->addExtraClass('ss-ui-button')
+					->setAttribute('data-icon', 'magnifier')
+			)
+		);
+
+		$form->addExtraClass('stacked add-existing-search-form');
+		$form->setFormMethod('GET');
+
+		return $form;
+	}
+
+	public function doSearch($data, $form) {
+		$list = $this->context->getQuery($data, false, false, $this->getSearchList());
+		$list = $list->subtract($this->grid->getList());
+		$list = new PaginatedList($list, $this->request);
+
+		$data = $this->customise(array(
+			'SearchForm' => $form,
+			'Items'      => $list
+		));
+		return $data->index();
+	}
+
+	public function Items() {
+		$list = $this->getSearchList();
+		$list = $list->subtract($this->grid->getList());
+		$list = new PaginatedList($list, $this->request);
+
+		return $list;
+	}
+
+	public function Link($action = null) {
+		return Controller::join_links($this->grid->Link(), 'add-existing-search', $action);
+	}
+
+	/**
+	 * @return DataList
+	 */
+	protected function getSearchList() {
+		return $this->button->getSearchList() ?: DataList::create($this->grid->getList()->dataClass());
+	}
+
+}
diff --git a/code/GridFieldAddNewMultiClass.php b/code/GridFieldAddNewMultiClass.php
index 9d4d1ea..37af98d 100755
--- a/code/GridFieldAddNewMultiClass.php
+++ b/code/GridFieldAddNewMultiClass.php
@@ -10,7 +10,7 @@ class GridFieldAddNewMultiClass implements GridField_HTMLProvider, GridField_URL
 	private static $allowed_actions = array(
 		'handleAdd'
 	);
-	
+
 	// Should we add an empty string to the add class dropdown?
 	private static $showEmptyString = true;
 
@@ -19,7 +19,7 @@ class GridFieldAddNewMultiClass implements GridField_HTMLProvider, GridField_URL
 	private $title;
 
 	private $classes;
-	
+
 	private $defaultClass;
 
 	/**
@@ -128,7 +128,7 @@ class GridFieldAddNewMultiClass implements GridField_HTMLProvider, GridField_URL
 	 */
 	public function setDefaultClass($default) {
 		$this->defaultClass = $default;
-		return $this;	
+		return $this;
 	}
 
 	/**
diff --git a/code/GridFieldOrderableRows.php b/code/GridFieldOrderableRows.php
index 0be7897..1af09ff 100755
--- a/code/GridFieldOrderableRows.php
+++ b/code/GridFieldOrderableRows.php
@@ -1,403 +1,403 @@
-<?php
-/**
- * Allows grid field rows to be re-ordered via drag and drop. Both normal data
- * lists and many many lists can be ordered.
- *
- * If the grid field has not been sorted, this component will sort the data by
- * the sort field.
- */
-class GridFieldOrderableRows extends RequestHandler implements
-	GridField_ColumnProvider,
-	GridField_DataManipulator,
-	GridField_HTMLProvider,
-	GridField_URLHandler {
-
-	private static $allowed_actions = array(
-		'handleReorder',
-		'handleMoveToPage'
-	);
-
-	/**
-	 * The database field which specifies the sort, defaults to "Sort".
-	 *
-	 * @see setSortField()
-	 * @var string
-	 */
-	protected $sortField;
-
-	/**
-	 * Extra sort fields to apply before the sort field.
-	 *
-	 * @see setExtraSortFields()
-	 * @var string|array
-	 */
-	protected $extraSortFields = null;
-
-	/**
-	 * The number of the column containing the reorder handles
-	 *
-	 * @see setReorderColumnNumber()
-	 * @var integer
-	 */
-	protected $reorderColumnNumber = 0;
-
-	/**
-	 * @param string $sortField
-	 */
-	public function __construct($sortField = 'Sort') {
-		$this->sortField = $sortField;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getSortField() {
-		return $this->sortField;
-	}
-
-	/**
-	 * Sets the field used to specify the sort.
-	 *
-	 * @param string $sortField
-	 * @return GridFieldOrderableRows $this
-	 */
-	public function setSortField($field) {
-		$this->sortField = $field;
-		return $this;
-	}
-
-	/**
-	 * @return string|array
-	 */
-	public function getExtraSortFields() {
-		return $this->extraSortFields;
-	}
-
-	/**
-	 * Sets extra sort fields to apply before the sort field.
-	 *
-	 * @param string|array $fields
-	 * @return GridFieldOrderableRows $this
-	 */
-	public function setExtraSortFields($fields) {
-		$this->extraSortFields = $fields;
-		return $this;
-	}
-
-	/**
-	 * @return integer
-	 */
-	public function getReorderColumnNumber() {
-		return $this->reorderColumnNumber;
-	}
-
-	/**
-	 * Sets the number of the column containing the reorder handles.
-	 *
-	 * @param integer $colno
-	 * @return GridFieldOrderableRows $this
-	 */
-	public function setReorderColumnNumber($colno) {
-		$this->reorderColumnNumber = $colno;
-		return $this;
-	}
-
-	/**
-	 * Gets the table which contains the sort field.
-	 *
-	 * @param DataList $list
-	 * @return string
-	 */
-	public function getSortTable(DataList $list) {
-		$field = $this->getSortField();
-
-		if($list instanceof ManyManyList) {
-			$extra = $list->getExtraFields();
-			$table = $list->getJoinTable();
-
-			if($extra && array_key_exists($field, $extra)) {
-				return $table;
-			}
-		}
-
-		$classes = ClassInfo::dataClassesFor($list->dataClass());
-
-		foreach($classes as $class) {
-			if(singleton($class)->hasOwnTableDatabaseField($field)) {
-				return $class;
-			}
-		}
-
-		throw new Exception("Couldn't find the sort field '$field'");
-	}
-
-	public function getURLHandlers($grid) {
-		return array(
-			'POST reorder'    => 'handleReorder',
-			'POST movetopage' => 'handleMoveToPage'
-		);
-	}
-
-	/**
-	 * @param GridField $field
-	 */
-	public function getHTMLFragments($field) {
-		GridFieldExtensions::include_requirements();
-
-		$field->addExtraClass('ss-gridfield-orderable');
-		$field->setAttribute('data-url-reorder', $field->Link('reorder'));
-		$field->setAttribute('data-url-movetopage', $field->Link('movetopage'));
-	}
-
-	public function augmentColumns($grid, &$cols) {
-		if(!in_array('Reorder', $cols) && $grid->getState()->GridFieldOrderableRows->enabled) {
-			array_splice($cols, $this->reorderColumnNumber, 0, 'Reorder');
-		}
-	}
-
-	public function getColumnsHandled($grid) {
-		return array('Reorder');
-	}
-
-	public function getColumnContent($grid, $record, $col) {
-		return ViewableData::create()->renderWith('GridFieldOrderableRowsDragHandle');
-	}
-
-	public function getColumnAttributes($grid, $record, $col) {
-		return array('class' => 'col-reorder');
-	}
-
-	public function getColumnMetadata($grid, $col) {
-		return array('title' => '');
-	}
-
-	public function getManipulatedData(GridField $grid, SS_List $list) {
-		$state = $grid->getState();
-		$sorted = (bool) ((string) $state->GridFieldSortableHeader->SortColumn);
-
-		// If the data has not been sorted by the user, then sort it by the
-		// sort column, otherwise disable reordering.
-		$state->GridFieldOrderableRows->enabled = !$sorted;
-
-		if(!$sorted) {
-			$sortterm = '';
-			if ($this->extraSortFields) {
-				if (is_array($this->extraSortFields)) {
-					foreach($this->extraSortFields as $col => $dir) {
-						$sortterm .= "$col $dir, ";
-					}
-				} else {
-					$sortterm = $this->extraSortFields.', ';
-				}
-			}
-			$sortterm .= '"'.$this->getSortTable($list).'"."'.$this->getSortField().'"';
-			return $list->sort($sortterm);
-		} else {
-			return $list;
-		}
-	}
-
-	/**
-	 * Handles requests to reorder a set of IDs in a specific order.
-	 *
-	 * @param GridField $grid
-	 * @param SS_HTTPRequest $request
-	 * @return SS_HTTPResponse
-	 */
-	public function handleReorder($grid, $request) {
-		$list = $grid->getList();
-		$modelClass = $grid->getModelClass();
-		if ($list instanceof ManyManyList && !singleton($modelClass)->canView()) {
-			$this->httpError(403);
-		} else if(!($list instanceof ManyManyList) && !singleton($modelClass)->canEdit()) {
-			$this->httpError(403);
-		}
-
-		$ids   = $request->postVar('order');
-		$field = $this->getSortField();
-
-		if(!is_array($ids)) {
-			$this->httpError(400);
-		}
-
-		$sortterm = '';
-		if ($this->extraSortFields) {
-			if (is_array($this->extraSortFields)) {
-				foreach($this->extraSortFields as $col => $dir) {
-					$sortterm .= "$col $dir, ";
-				}
-			} else {
-				$sortterm = $this->extraSortFields.', ';
-			}
-		}
-		$sortterm .= '"'.$this->getSortTable($list).'"."'.$field.'"';
-		$items = $list->filter('ID', $ids)->sort($sortterm);
-
-		// Ensure that each provided ID corresponded to an actual object.
-		if(count($items) != count($ids)) {
-			$this->httpError(404);
-		}
-
-		// Save any un-comitted changes to the gridfield
-		if(($form = $grid->getForm()) && ($record = $form->getRecord()) ) {
-			$form->loadDataFrom($request->requestVars(), true);
-			$grid->saveInto($record);
-		}
-
-		// Populate each object we are sorting with a sort value.
-		$this->populateSortValues($items);
-
-		// Generate the current sort values.
-		if ($items instanceof ManyManyList) 
-		{
-			$current = array();
-			foreach ($items->toArray() as $record)
-			{
-				// NOTE: _SortColumn0 is the first ->sort() field
-				//		 used by SS when functions are detected in a SELECT
-				//	     or CASE WHEN.
-				if (isset($record->_SortColumn0)) {
-					$current[$record->ID] = $record->_SortColumn0;
-				} else {
-					$current[$record->ID] = $record->$field;
-				}
-			}
-		}
-		else
-		{
-			$current = $items->map('ID', $field)->toArray();
-		}
-
-		// Perform the actual re-ordering.
-		$this->reorderItems($list, $current, $ids);
-
-		return $grid->FieldHolder();
-	}
-
-	/**
-	 * Handles requests to move an item to the previous or next page.
-	 */
-	public function handleMoveToPage(GridField $grid, $request) {
-		if(!$paginator = $grid->getConfig()->getComponentByType('GridFieldPaginator')) {
-			$this->httpError(404, 'Paginator component not found');
-		}
-
-		$move  = $request->postVar('move');
-		$field = $this->getSortField();
-
-		$list  = $grid->getList();
-		$manip = $grid->getManipulatedList();
-
-		$existing = $manip->map('ID', $field)->toArray();
-		$values   = $existing;
-		$order    = array();
-
-		$id = isset($move['id']) ? (int) $move['id'] : null;
-		$to = isset($move['page']) ? $move['page'] : null;
-
-		if(!isset($values[$id])) {
-			$this->httpError(400, 'Invalid item ID');
-		}
-
-		$this->populateSortValues($list);
-
-		$page = ((int) $grid->getState()->GridFieldPaginator->currentPage) ?: 1;
-		$per  = $paginator->getItemsPerPage();
-
-		if($to == 'prev') {
-			$swap = $list->limit(1, ($page - 1) * $per - 1)->first();
-			$values[$swap->ID] = $swap->$field;
-
-			$order[] = $id;
-			$order[] = $swap->ID;
-
-			foreach($existing as $_id => $sort) {
-				if($id != $_id) $order[] = $_id;
-			}
-		} elseif($to == 'next') {
-			$swap = $list->limit(1, $page * $per)->first();
-			$values[$swap->ID] = $swap->$field;
-
-			foreach($existing as $_id => $sort) {
-				if($id != $_id) $order[] = $_id;
-			}
-
-			$order[] = $swap->ID;
-			$order[] = $id;
-		} else {
-			$this->httpError(400, 'Invalid page target');
-		}
-
-		$this->reorderItems($list, $values, $order);
-
-		return $grid->FieldHolder();
-	}
-
-	protected function reorderItems($list, array $values, array $order) {
-		// Get a list of sort values that can be used.
-		$pool = array_values($values);
-		sort($pool);
-
-		// Loop through each item, and update the sort values which do not
-		// match to order the objects.
-		foreach(array_values($order) as $pos => $id) {
-			if($values[$id] != $pool[$pos]) {
-				DB::query(sprintf(
-					'UPDATE "%s" SET "%s" = %d WHERE %s',
-					$this->getSortTable($list),
-					$this->getSortField(),
-					$pool[$pos],
-					$this->getSortTableClauseForIds($list, $id)
-				));
-			}
-		}
-	}
-
-	protected function populateSortValues(DataList $list) {
-		$list   = clone $list;
-		$field  = $this->getSortField();
-		$table  = $this->getSortTable($list);
-		$clause = sprintf('"%s"."%s" = 0', $table, $this->getSortField());
-
-		foreach($list->where($clause)->column('ID') as $id) {
-			$max = DB::query(sprintf('SELECT MAX("%s") + 1 FROM "%s"', $field, $table));
-			$max = $max->value();
-
-			DB::query(sprintf(
-				'UPDATE "%s" SET "%s" = %d WHERE %s',
-				$table,
-				$field,
-				$max,
-				$this->getSortTableClauseForIds($list, $id)
-			));
-		}
-	}
-
-	protected function getSortTableClauseForIds(DataList $list, $ids) {
-		if(is_array($ids)) {
-			$value = 'IN (' . implode(', ', array_map('intval', $ids)) . ')';
-		} else {
-			$value = '= ' . (int) $ids;
-		}
-
-		if($list instanceof ManyManyList) {
-			$extra = $list->getExtraFields();
-			$key   = $list->getLocalKey();
-			$foreignKey = $list->getForeignKey();
-			$foreignID  = (int) $list->getForeignID();
-
-			if($extra && array_key_exists($this->getSortField(), $extra)) {
-				return sprintf(
-					'"%s" %s AND "%s" = %d',
-					$key,
-					$value,
-					$foreignKey,
-					$foreignID
-				);
-			}
-		}
-
-		return "\"ID\" $value";
-	}
-
-}
+<?php
+/**
+ * Allows grid field rows to be re-ordered via drag and drop. Both normal data
+ * lists and many many lists can be ordered.
+ *
+ * If the grid field has not been sorted, this component will sort the data by
+ * the sort field.
+ */
+class GridFieldOrderableRows extends RequestHandler implements
+	GridField_ColumnProvider,
+	GridField_DataManipulator,
+	GridField_HTMLProvider,
+	GridField_URLHandler {
+
+	private static $allowed_actions = array(
+		'handleReorder',
+		'handleMoveToPage'
+	);
+
+	/**
+	 * The database field which specifies the sort, defaults to "Sort".
+	 *
+	 * @see setSortField()
+	 * @var string
+	 */
+	protected $sortField;
+
+	/**
+	 * Extra sort fields to apply before the sort field.
+	 *
+	 * @see setExtraSortFields()
+	 * @var string|array
+	 */
+	protected $extraSortFields = null;
+
+	/**
+	 * The number of the column containing the reorder handles
+	 *
+	 * @see setReorderColumnNumber()
+	 * @var integer
+	 */
+	protected $reorderColumnNumber = 0;
+
+	/**
+	 * @param string $sortField
+	 */
+	public function __construct($sortField = 'Sort') {
+		$this->sortField = $sortField;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getSortField() {
+		return $this->sortField;
+	}
+
+	/**
+	 * Sets the field used to specify the sort.
+	 *
+	 * @param string $sortField
+	 * @return GridFieldOrderableRows $this
+	 */
+	public function setSortField($field) {
+		$this->sortField = $field;
+		return $this;
+	}
+
+	/**
+	 * @return string|array
+	 */
+	public function getExtraSortFields() {
+		return $this->extraSortFields;
+	}
+
+	/**
+	 * Sets extra sort fields to apply before the sort field.
+	 *
+	 * @param string|array $fields
+	 * @return GridFieldOrderableRows $this
+	 */
+	public function setExtraSortFields($fields) {
+		$this->extraSortFields = $fields;
+		return $this;
+	}
+
+	/**
+	 * @return integer
+	 */
+	public function getReorderColumnNumber() {
+		return $this->reorderColumnNumber;
+	}
+
+	/**
+	 * Sets the number of the column containing the reorder handles.
+	 *
+	 * @param integer $colno
+	 * @return GridFieldOrderableRows $this
+	 */
+	public function setReorderColumnNumber($colno) {
+		$this->reorderColumnNumber = $colno;
+		return $this;
+	}
+
+	/**
+	 * Gets the table which contains the sort field.
+	 *
+	 * @param DataList $list
+	 * @return string
+	 */
+	public function getSortTable(DataList $list) {
+		$field = $this->getSortField();
+
+		if($list instanceof ManyManyList) {
+			$extra = $list->getExtraFields();
+			$table = $list->getJoinTable();
+
+			if($extra && array_key_exists($field, $extra)) {
+				return $table;
+			}
+		}
+
+		$classes = ClassInfo::dataClassesFor($list->dataClass());
+
+		foreach($classes as $class) {
+			if(singleton($class)->hasOwnTableDatabaseField($field)) {
+				return $class;
+			}
+		}
+
+		throw new Exception("Couldn't find the sort field '$field'");
+	}
+
+	public function getURLHandlers($grid) {
+		return array(
+			'POST reorder'    => 'handleReorder',
+			'POST movetopage' => 'handleMoveToPage'
+		);
+	}
+
+	/**
+	 * @param GridField $field
+	 */
+	public function getHTMLFragments($field) {
+		GridFieldExtensions::include_requirements();
+
+		$field->addExtraClass('ss-gridfield-orderable');
+		$field->setAttribute('data-url-reorder', $field->Link('reorder'));
+		$field->setAttribute('data-url-movetopage', $field->Link('movetopage'));
+	}
+
+	public function augmentColumns($grid, &$cols) {
+		if(!in_array('Reorder', $cols) && $grid->getState()->GridFieldOrderableRows->enabled) {
+			array_splice($cols, $this->reorderColumnNumber, 0, 'Reorder');
+		}
+	}
+
+	public function getColumnsHandled($grid) {
+		return array('Reorder');
+	}
+
+	public function getColumnContent($grid, $record, $col) {
+		return ViewableData::create()->renderWith('GridFieldOrderableRowsDragHandle');
+	}
+
+	public function getColumnAttributes($grid, $record, $col) {
+		return array('class' => 'col-reorder');
+	}
+
+	public function getColumnMetadata($grid, $col) {
+		return array('title' => '');
+	}
+
+	public function getManipulatedData(GridField $grid, SS_List $list) {
+		$state = $grid->getState();
+		$sorted = (bool) ((string) $state->GridFieldSortableHeader->SortColumn);
+
+		// If the data has not been sorted by the user, then sort it by the
+		// sort column, otherwise disable reordering.
+		$state->GridFieldOrderableRows->enabled = !$sorted;
+
+		if(!$sorted) {
+			$sortterm = '';
+			if ($this->extraSortFields) {
+				if (is_array($this->extraSortFields)) {
+					foreach($this->extraSortFields as $col => $dir) {
+						$sortterm .= "$col $dir, ";
+					}
+				} else {
+					$sortterm = $this->extraSortFields.', ';
+				}
+			}
+			$sortterm .= '"'.$this->getSortTable($list).'"."'.$this->getSortField().'"';
+			return $list->sort($sortterm);
+		} else {
+			return $list;
+		}
+	}
+
+	/**
+	 * Handles requests to reorder a set of IDs in a specific order.
+	 *
+	 * @param GridField $grid
+	 * @param SS_HTTPRequest $request
+	 * @return SS_HTTPResponse
+	 */
+	public function handleReorder($grid, $request) {
+		$list = $grid->getList();
+		$modelClass = $grid->getModelClass();
+		if ($list instanceof ManyManyList && !singleton($modelClass)->canView()) {
+			$this->httpError(403);
+		} else if(!($list instanceof ManyManyList) && !singleton($modelClass)->canEdit()) {
+			$this->httpError(403);
+		}
+
+		$ids   = $request->postVar('order');
+		$field = $this->getSortField();
+
+		if(!is_array($ids)) {
+			$this->httpError(400);
+		}
+
+		$sortterm = '';
+		if ($this->extraSortFields) {
+			if (is_array($this->extraSortFields)) {
+				foreach($this->extraSortFields as $col => $dir) {
+					$sortterm .= "$col $dir, ";
+				}
+			} else {
+				$sortterm = $this->extraSortFields.', ';
+			}
+		}
+		$sortterm .= '"'.$this->getSortTable($list).'"."'.$field.'"';
+		$items = $list->filter('ID', $ids)->sort($sortterm);
+
+		// Ensure that each provided ID corresponded to an actual object.
+		if(count($items) != count($ids)) {
+			$this->httpError(404);
+		}
+
+		// Save any un-comitted changes to the gridfield
+		if(($form = $grid->getForm()) && ($record = $form->getRecord()) ) {
+			$form->loadDataFrom($request->requestVars(), true);
+			$grid->saveInto($record);
+		}
+
+		// Populate each object we are sorting with a sort value.
+		$this->populateSortValues($items);
+
+		// Generate the current sort values.
+		if ($items instanceof ManyManyList)
+		{
+			$current = array();
+			foreach ($items->toArray() as $record)
+			{
+				// NOTE: _SortColumn0 is the first ->sort() field
+				//		 used by SS when functions are detected in a SELECT
+				//	     or CASE WHEN.
+				if (isset($record->_SortColumn0)) {
+					$current[$record->ID] = $record->_SortColumn0;
+				} else {
+					$current[$record->ID] = $record->$field;
+				}
+			}
+		}
+		else
+		{
+			$current = $items->map('ID', $field)->toArray();
+		}
+
+		// Perform the actual re-ordering.
+		$this->reorderItems($list, $current, $ids);
+
+		return $grid->FieldHolder();
+	}
+
+	/**
+	 * Handles requests to move an item to the previous or next page.
+	 */
+	public function handleMoveToPage(GridField $grid, $request) {
+		if(!$paginator = $grid->getConfig()->getComponentByType('GridFieldPaginator')) {
+			$this->httpError(404, 'Paginator component not found');
+		}
+
+		$move  = $request->postVar('move');
+		$field = $this->getSortField();
+
+		$list  = $grid->getList();
+		$manip = $grid->getManipulatedList();
+
+		$existing = $manip->map('ID', $field)->toArray();
+		$values   = $existing;
+		$order    = array();
+
+		$id = isset($move['id']) ? (int) $move['id'] : null;
+		$to = isset($move['page']) ? $move['page'] : null;
+
+		if(!isset($values[$id])) {
+			$this->httpError(400, 'Invalid item ID');
+		}
+
+		$this->populateSortValues($list);
+
+		$page = ((int) $grid->getState()->GridFieldPaginator->currentPage) ?: 1;
+		$per  = $paginator->getItemsPerPage();
+
+		if($to == 'prev') {
+			$swap = $list->limit(1, ($page - 1) * $per - 1)->first();
+			$values[$swap->ID] = $swap->$field;
+
+			$order[] = $id;
+			$order[] = $swap->ID;
+
+			foreach($existing as $_id => $sort) {
+				if($id != $_id) $order[] = $_id;
+			}
+		} elseif($to == 'next') {
+			$swap = $list->limit(1, $page * $per)->first();
+			$values[$swap->ID] = $swap->$field;
+
+			foreach($existing as $_id => $sort) {
+				if($id != $_id) $order[] = $_id;
+			}
+
+			$order[] = $swap->ID;
+			$order[] = $id;
+		} else {
+			$this->httpError(400, 'Invalid page target');
+		}
+
+		$this->reorderItems($list, $values, $order);
+
+		return $grid->FieldHolder();
+	}
+
+	protected function reorderItems($list, array $values, array $order) {
+		// Get a list of sort values that can be used.
+		$pool = array_values($values);
+		sort($pool);
+
+		// Loop through each item, and update the sort values which do not
+		// match to order the objects.
+		foreach(array_values($order) as $pos => $id) {
+			if($values[$id] != $pool[$pos]) {
+				DB::query(sprintf(
+					'UPDATE "%s" SET "%s" = %d WHERE %s',
+					$this->getSortTable($list),
+					$this->getSortField(),
+					$pool[$pos],
+					$this->getSortTableClauseForIds($list, $id)
+				));
+			}
+		}
+	}
+
+	protected function populateSortValues(DataList $list) {
+		$list   = clone $list;
+		$field  = $this->getSortField();
+		$table  = $this->getSortTable($list);
+		$clause = sprintf('"%s"."%s" = 0', $table, $this->getSortField());
+
+		foreach($list->where($clause)->column('ID') as $id) {
+			$max = DB::query(sprintf('SELECT MAX("%s") + 1 FROM "%s"', $field, $table));
+			$max = $max->value();
+
+			DB::query(sprintf(
+				'UPDATE "%s" SET "%s" = %d WHERE %s',
+				$table,
+				$field,
+				$max,
+				$this->getSortTableClauseForIds($list, $id)
+			));
+		}
+	}
+
+	protected function getSortTableClauseForIds(DataList $list, $ids) {
+		if(is_array($ids)) {
+			$value = 'IN (' . implode(', ', array_map('intval', $ids)) . ')';
+		} else {
+			$value = '= ' . (int) $ids;
+		}
+
+		if($list instanceof ManyManyList) {
+			$extra = $list->getExtraFields();
+			$key   = $list->getLocalKey();
+			$foreignKey = $list->getForeignKey();
+			$foreignID  = (int) $list->getForeignID();
+
+			if($extra && array_key_exists($this->getSortField(), $extra)) {
+				return sprintf(
+					'"%s" %s AND "%s" = %d',
+					$key,
+					$value,
+					$foreignKey,
+					$foreignID
+				);
+			}
+		}
+
+		return "\"ID\" $value";
+	}
+
+}