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Flex Drag/Drop from List

Hello! I have created an Application that allows dragging text entries from one list to another. I need it to Show a dialogue listing those items that are in the second list every time an item is dragged over. This works except it does not show in the dialogue the last item moved over. So for instance, the first item moved will not show up and then next will show all the items except the last item that was moved over. My code is below:

Thanks!
Ron

<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
			   creationComplete="initApp();">

	
			   
			   
			   
	
	<fx:Script>
		<![CDATA[

			import mx.controls.List;
			import mx.events.DragEvent;
			import mx.events.ListEvent;
			
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			
			 import mx.managers.DragManager;


		

			private function initApp():void 
			{
				srclist.dataProvider = 
				new ArrayCollection(['first', 'second', 'third']);
				destlist.dataProvider = new ArrayCollection([]);
            }
			private function onDragEvent(event:DragEvent):void
			{
				var myList:List =  event.currentTarget as List;
				Alert.show("item dropped: " +  myList.dataProvider + " :");
    
			}

		]]>
	</fx:Script>		   
			   		

	
	<mx:Panel id="panel2" title="draganddrop" width="500" height="500">
		<mx:HBox>
			<mx:VBox>
				<mx:Label text="moveFrom"/>
				<mx:List id="srclist" 
					allowMultipleSelection="true"
					dragEnabled="true"
					dragMoveEnabled="true"
					dropEnabled="true"
					/>
			</mx:VBox>

			<mx:VBox>
				<mx:Label text="moveTO"/>
				<mx:List id="destlist" 
					allowMultipleSelection="true"
					dragEnabled="true"
					dragMoveEnabled="true"
					dropEnabled="true"
					dragDrop="onDragEvent(event);"
					/>
					
			</mx:VBox>
		</mx:HBox>
	</mx:Panel>	
</mx:Application>

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dgofman

Modified your drop function

private function onDragEvent(event:DragEvent):void
                  {
                        var myList:List = event.currentTarget as List;
                        var dragSource:Array = event.dragSource.dataForFormat('items') as Array;
                        Alert.show("item dropped:\n" + dragSource.join('\n'));

                  }

ronyosi

ASKER

Thanks dgofman :)
I tried the function and it shows me only what the item is that I dropped in.
How do I make the Alert display all the items in the second list?

Ron

dgofman

Why you cannot filter your ArrayCollection by drop items and get rest of items.

https://www.experts-exchange.com/questions/26885698/arrayCollection-Grouping-for-comboBox.html?cid=1131&anchorAnswerId=35134376#a35134376

or

trace(srclist.dataProvider);

dgofman

Dear ronyosi,
I think my solutions should work for your prety well.
Please can you close this question?
Thanks,
David

ronyosi

ASKER

I might actually need you to spell it out.
I have not been able to put your solution together
can you please assist me? I tried putting it together and it did not work the array just stores everything now with repetitions...

dgofman

Please can you give me your code sample?

ronyosi

ASKER

<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
			   creationComplete="initApp();">

	<fx:Script>
		<![CDATA[

			import mx.collections.ArrayList;
			import mx.controls.List;
			import mx.events.DragEvent;
			import mx.events.ListEvent;
			
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			
			import mx.managers.DragManager;

			[Bindable] 
			public var itemsDropped:ArrayCollection; 
		

			private function initApp():void 
			{
				srclist.dataProvider = 
				new ArrayCollection(['first', 'second', 'third']);
				
				itemsDropped = new ArrayCollection();		
				
				destlist.dataProvider = new ArrayCollection([]);
				
            }

			
			private function onDragEvent(event:DragEvent):void
                  {
					itemsDropped = destlist.dataProvider as ArrayCollection;
					Alert.show(itemsDropped.toString());
                  } 
			

		]]>
	</fx:Script>		   
			   		

	
	<mx:Panel id="panel2" title="draganddrop" width="500" height="500">
		<mx:HBox>
			<mx:VBox>
				<mx:Label text="moveFrom"/>
				<mx:List id="srclist" 
					allowMultipleSelection="true"
					dragEnabled="true"
					dragMoveEnabled="true"
					dropEnabled="true"
					/>
			</mx:VBox>

			<mx:VBox>
				<mx:Label text="moveTO"/>
				<mx:List id="destlist" 
					allowMultipleSelection="true"
					dragEnabled="true"
					dragMoveEnabled="true"
					dropEnabled="true"
					dragDrop="onDragEvent(event);"
					/>
					
			</mx:VBox>
			
			
			

		</mx:HBox>
	
					
		
	</mx:Panel>	
	
	
</mx:Application>

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ronyosi

ASKER

so you see, this one does just what I need, EXCEPT it misses the first item dragged to the next list.
Do you know how to fix this? Also why it does this?

Thanks,
Ron

dgofman

I don't see you are using my solution, plus I can handle multiple selection and drag & drop to destination List component

<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
				xmlns:s="library://ns.adobe.com/flex/spark" 
				xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
	
	<fx:Script>
		<![CDATA[
			
			import mx.collections.ArrayCollection;
			import mx.controls.Alert;
			import mx.controls.List;
			import mx.events.DragEvent;

			[Bindable] 
			public var list:ArrayCollection = new ArrayCollection(['first', 'second', 'third']); 

			private function onDragEvent(event:DragEvent):void
			{
				var myList:List =  event.currentTarget as List;
				var dragSource:Array = event.dragSource.dataForFormat('items') as Array;
				Alert.show("item dropped:\n" +  dragSource.join('\n') + 
					"\nTotal of drop items:" + (destlist.dataProvider.length + dragSource.length) +
					"\nTotal of source items: " + (srclist.dataProvider.length - dragSource.length));
			}
		]]>
	</fx:Script>

	<mx:Panel id="panel2" title="draganddrop" width="500" height="500">
		<mx:HBox>
			<mx:VBox>
				<mx:Label text="moveFrom"/>
				<mx:List id="srclist" dataProvider="{list}"
						 allowMultipleSelection="true"
						 dragEnabled="true"
						 dragMoveEnabled="true"
						 dropEnabled="true"
						 />
			</mx:VBox>
			
			<mx:VBox>
				<mx:Label text="moveTO"/>
				<mx:List id="destlist" dataProvider="[]"
						 allowMultipleSelection="true"
						 dragEnabled="true"
						 dragMoveEnabled="true"
						 dropEnabled="true"
						 dragDrop="onDragEvent(event);"
						 />
			</mx:VBox>
		</mx:HBox>
	</mx:Panel>	
</mx:Application>

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ronyosi

ASKER

your solution is not what I need...
Again, Whatever items are in the second box I would like those items to be stored in an array so that they can be kept track of. Your example did not do this. Instead it showed one item at a time.
Sorry for not using your example, but it was not what I was asking for. My example is closer to what is required so I thought I would help you.

Ron

ronyosi

ASKER

Originally I just wanted to be able to print out a list of the items that are in the second list.
Remember?
"Show a dialogue listing those items that are in the second list every time an item is dragged over."
Meaning when an Item is dragged in, show an alert with a list of all the items in the box its dragged into.

Please help :)

ASKER CERTIFIED SOLUTION

dgofman

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ronyosi

ASKER

Very Helpful answer dgofman, very patient also :)
Thanks!!