From f7f268a859db0767bba3492aec9f97e54a86a9db Mon Sep 17 00:00:00 2001
From: Ingo Schommer <ingo@silverstripe.com>
Date: Tue, 21 Aug 2012 22:57:40 +0200
Subject: [PATCH] NEW Document sorting (and optional drag'n'drop)

---
 README.md                     |  1 +
 code/DMSDocument.php          |  8 +++++++-
 code/DMSSiteTreeExtension.php | 16 ++++++++++++++--
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index e8751b0..6055bac 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,7 @@ Example:
 ### Requirements
 
  * PHP 5.3 with the "fileinfo" module (or alternatively the "whereis" and "file" Unix commands)
+ * (optional) [https://github.com/UndefinedOffset/SortableGridField]("SortableGridField" module)
 
 ### Configuration
 
diff --git a/code/DMSDocument.php b/code/DMSDocument.php
index b278453..923f8a7 100644
--- a/code/DMSDocument.php
+++ b/code/DMSDocument.php
@@ -17,7 +17,13 @@ class DMSDocument extends DataObject implements DMSDocumentInterface {
 		'Pages' => 'SiteTree',
 		'Tags' => 'DMSTag'
 	);
-	
+
+	static $many_many_extraFields = array(
+		'Pages' => array(
+			'DocumentSort' => 'Int'
+		),
+	);
+
 	static $display_fields = array(
 		'ID'=>'ID',
 		'Title'=>'Title',
diff --git a/code/DMSSiteTreeExtension.php b/code/DMSSiteTreeExtension.php
index ceb18cc..a1e4b81 100644
--- a/code/DMSSiteTreeExtension.php
+++ b/code/DMSSiteTreeExtension.php
@@ -4,7 +4,7 @@ class DMSSiteTreeExtension extends DataExtension {
 	static $belongs_many_many = array(
 		'Documents' => 'DMSDocument'
 	);
-	
+
 	function updateCMSFields(FieldList $fields){
 		//javascript to customize the grid field for the DMS document (overriding entwine in FRAMEWORK_DIR.'/javascript/GridField.js'
 		Requirements::javascript('dms/javascript/DMSGridField.js');
@@ -19,12 +19,17 @@ class DMSSiteTreeExtension extends DataExtension {
 			new GridFieldFilterHeader(),
 			new GridFieldSortableHeader(),
 			new GridFieldDataColumns(),
-			new GridFieldPaginator(15),
+			$paginatorComponent = new GridFieldPaginator(15),
 			new GridFieldEditButton(),
 			new DMSGridFieldDeleteAction(), //special delete dialog to handle custom behaviour of unlinking and deleting
 			new GridFieldDetailForm()
 			//GridFieldLevelup::create($folder->ID)->setLinkSpec('admin/assets/show/%d')
 		);
+		if(class_exists('GridFieldSortableRows')) {
+			$sortableComponent = new GridFieldSortableRows('DocumentSort');
+			$sortableComponent->setUsePagination(false)->setForceRedraw(true);
+			$gridFieldConfig->addComponent($sortableComponent);
+		}
 
 		// HACK: Create a singleton of DMSDocument to ensure extensions are applied before we try to get display fields.
 		singleton('DMSDocument');
@@ -60,6 +65,13 @@ class DMSSiteTreeExtension extends DataExtension {
 		);
 	}
 
+	/**
+	 * Overloaded to enforce sorting
+	 */
+	function Documents() {
+		return $this->owner->getManyManyComponents('Documents')->sort('DocumentSort');
+	}
+
 	function onBeforeDelete() {
 		$dmsDocuments = $this->owner->Documents();
 		foreach($dmsDocuments as $document) {