How do you disable dragCopy?

[suflex]

Hello

I have a list container with dragable Items. What i like to do is to allow drag and drop but NOT when pressing CTRL and draging. This copies the item in the list contianer and causes all sorts of problem with the data.

I want to know how I can disable the dragCopy?

Thanks
Suflex

[flexy]

I suflex, I had a look at the docs around this, and it seems a tricky one. I would try using a keyboard listener to listen for the control key press; if it's down, stop any dragging actions through DragManager...

[ksatola]

You cannot make such a change via MXML (if you use Flex) but you can use ActionScript and event listeners to handle that behavior. Here is an example, I hope it helps

Code:

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.controls.DataGrid;
import mx.events.DragEvent;
import mx.managers.DragManager;


private function dragCompleteHandler(event:DragEvent):void {
if(event.action != DragManager.NONE) {
var myGrid:DataGrid = DataGrid(event.dragInitiator);
var myData:ArrayCollection = ArrayCollection(myGrid.dataProvider);
var myItem:Object = event.dragSource.dataForFormat("items")[0];
for(var i:uint = 0; i < myData.length; i++) {
if(myData.getItemAt(i).userID == myItem.userID) {
myData.removeItemAt(i);
break;
}
}
}
}
]]>
</mx:Script>
<mx:HBox width="100%" height="100%">
<mx:Label text="Source A"/>
<mx:DataGrid dropEnabled="true" dragEnabled="true" dragComplete="dragCompleteHandler(event)">
<mx:columns>
<mx:DataGridColumn headerText="Name" dataField="name"/>
<mx:DataGridColumn headerText="Surname" dataField="surname"/>
</mx:columns>
<mx:dataProvider>
<mx:ArrayCollection>
<mx:Object userID="0" name="Tom" surname="Black" />
<mx:Object userID="1" name="Alice" surname="White" />
</mx:ArrayCollection>
</mx:dataProvider>
</mx:DataGrid>

<mx:Label text="Source B"/>
<mx:DataGrid dropEnabled="true" dragEnabled="true" dragComplete="dragCompleteHandler(event)">
<mx:columns>
<mx:DataGridColumn headerText="Name" dataField="name"/>
<mx:DataGridColumn headerText="Surname" dataField="surname"/>
</mx:columns>
<mx:dataProvider>
<mx:ArrayCollection>
<mx:Object userID="0" name="Kate" surname="Ninio" />
<mx:Object userID="1" name="John" surname="Brown" />
</mx:ArrayCollection>
</mx:dataProvider>
</mx:DataGrid>

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

The dragCompleteHandler() method is invoked when a dragComplete event occurs. The source item is always removed from the source list no matter the dragging was used with or without CTRL key. Note that in this example you can drag items in both directions.

The demo is available here: http://satola.net/2007/09/DragCopyDisabled/DragCopyDisabled.html