Questtype ?Drag&Drop?: implement multiple valid Drag-items for each Drop-item

questtypes/dragndrop/DragndropQuesttypeController.inc

@@ -79,13 +79,17 @@
 			// Get Drag&Drop field
 			$dndField = $this->Dragndrop->getDragndrop($quest['id']);
 			
-			// Get Drops
+			// Get Drags
-			$drops = $this->Dragndrop->getDrops($dndField['quest_id']);
+			$drags = $this->Dragndrop->getDrags($dndField['quest_id'], true);
 			
-			// Match drops with user answers
+			// Match drags with user answers
-			foreach($drops as &$drop)
+			foreach($drags as &$drag)
 			{
-				if(!array_key_exists($drop['id'], $answers) || intval(substr($answers[$drop['id']], 4)) !== $drop['questtypes_dragndrop_drag_id']) {
+				$founds = array_keys($answers, 'drag'.$drag['id']);
+				if(count($founds) != 1) {
+					return false;
+				}
+				if(!$this->Dragndrop->dragMatchesDrop($drag['id'], $founds[0])) {
 					return false;
 				}
 			}

questtypes/dragndrop/DragndropQuesttypeModel.inc

@@ -56,7 +56,7 @@
 		public function getDrops($dragndropId)
 		{
 			return $this->db->query(
-				'SELECT id, top, `left`, width, height, questtypes_dragndrop_drag_id '.
+				'SELECT id, top, `left`, width, height '. //, questtypes_dragndrop_drag_id '.
 				'FROM questtypes_dragndrop_drops '.
 				'WHERE questtypes_dragndrop_id = ?',
 				'i',
@@ -69,20 +69,54 @@
 		 * Get Drag-items.
 		 * 
 		 * @param	int	$dragndropId	ID of Drag&Drop-field
+		 * @param	boolean	$onlyUsed	Only Drag-items that are used for a Drop-item
 		 * @return	array			Drag-items
 		 */
-		public function getDrags($dragndropId)
+		public function getDrags($dragndropId, $onlyUsed=false)
 		{
 			return $this->db->query(
 				'SELECT id, questmedia_id '.
 				'FROM questtypes_dragndrop_drags '.
-				'WHERE questtypes_dragndrop_id = ?',
+				'WHERE questtypes_dragndrop_id = ?'.
+				($onlyUsed
+					? ' AND EXISTS ('.
+						'SELECT questtypes_dragndrop_drag_id '.
+						'FROM questtypes_dragndrop_drops_drags '.
+						'WHERE questtypes_dragndrop_drag_id = questtypes_dragndrop_drags.id'.
+					')'
+					: null
+				),
 				'i',
 				$dragndropId
 			);
 		}
 		
 		
+		/**
+		 * Check if a Drag-item mathes a Drop-item.
+		 * 
+		 * @param	int	$dragId	ID of Drag-field
+		 * @param	int	$dropId	ID of Drop-field
+		 * @return	boolean	Drag-item is valid for Drop-item
+		 */
+		public function dragMatchesDrop($dragId, $dropId)
+		{
+			$data = $this->db->query(
+				'SELECT count(*) AS c '.
+				'FROM questtypes_dragndrop_drops_drags '.
+				'WHERE questtypes_dragndrop_drop_id = ? AND questtypes_dragndrop_drag_id = ?',
+				'ii',
+				$dropId, $dragId
+			);
+			if(!empty($data)) {
+				return ($data[0]['c'] > 0);
+			}
+			
+			
+			return false;
+		}
+		
+		
 		/**
 		 * Save Character’s submitted answer for one Drop-field.
 		 * 

questtypes/dragndrop/html/quest.tpl

@@ -2,7 +2,7 @@
 	<div id="dropZone" style="width:<?=$field['width']?>px; height:<?=$field['height']?>px; background-image:url('<?=$linker->link(array('media','seminary',$seminary['url'],$field['media']['url']))?>')">
 		<?php foreach($drops as &$drop) : ?>
 		<div id="drop<?=$drop['id']?>" ondragenter="onDragEnter(event)" ondragover="onDragOver(event)" ondragleave="onDragLeave(event)" ondrop="onDrop(event)" style="position:absolute; width:<?=$drop['width']?>px; height:<?=$drop['height']?>px; margin:<?=$drop['top']?>px 0 0 <?=$drop['left']?>px;"><?php if(array_key_exists('answer', $drop) && !is_null($drop['answer'])) : ?><img id="drag<?=$drop['answer']['id']?>" draggable="true" ondragstart="onDragStart(event)" ondragend="onDragEnd(event)" src="<?=$linker->link(array('media','seminary',$seminary['url'],$drop['answer']['media']['url']))?>" /><?php endif ?></div>
-		<input type="hidden" id="dnd_drop<?=$drop['id']?>" name="answers[<?=$drop['id']?>]" value="<?=(!is_null($drop['answer'])) ? 'drag'.$drop['answer']['id'] : null ?>" />
+		<input type="hidden" id="dnd_drop<?=$drop['id']?>" name="answers[<?=$drop['id']?>]" value="<?=(array_key_exists('answer', $drop)) ? 'drag'.$drop['answer']['id'] : null ?>" />
 		<?php endforeach ?>
 	</div>