The droptarget lists will receive DRAG_ENTER, DRAG_OVER, and DRAG_EXIT events. The DragEvent passed in contains a dragInitiator property which points to the source of the drag. You should implement handlers for these events, and if the source is not the right one, call DragManager.showFeedback(DragManager.NONE) and preventDefault() on the event object.
-Alex ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of lruinelli Sent: Sunday, March 18, 2007 11:57 AM To: [email protected] Subject: [flexcoders] question about drag & drop support in list-based component Hello! ...I developed a custom component named SwapList...to enable the user to select a set of data from List dragging and dropping it to another List. Knowing the flex drag & drop support in list-based component...It seems very simple...and easy to implement...but I have a problem...if I put more SwapList component in a form...the user can drag a drop items from every List of the from to every List of the form!! and I don't find any work around to avoid nonsense drag and drop!:-( are there any control which can be performed? or have I to implement all the drag and drop support manually? ...thanks for the help! ...pratical description: the code of my component: SwapList.mxml******************************** <?xml version="1.0" encoding="utf-8"?> <mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml <http://www.adobe.com/2006/mxml> " width="100%"> <mx:Script> <![CDATA[ import mx.events.DragEvent; import mx.managers.DragManager; import mx.core.UIComponent; import mx.core.DragSource; [Bindable] public var _dataProvider: Object; [Bindable] public var _labelField: String; [Inspectable(defaultValue=null)] public function set dataProvider(dataProvider:Object):void { _dataProvider = dataProvider; } [Inspectable(defaultValue="")] public function set labelField(labelField: String):void { _labelField = labelField; _labelField = labelField; } ]]> </mx:Script> <mx:List width="300" id="listFrom" dragEnter="onDragEnter(event)" dataProvider="{_dataProvider}" labelField="{_labelField}" dropEnabled="true" dragMoveEnabled="true" dragEnabled="true" height="74"></mx:List> <mx:List width="300" id="listTo" dragEnter="onDragEnter(event)" labelField="{_labelField}" dropEnabled="true" dragEnabled="true" dragMoveEnabled="true" height="74"></mx:List> </mx:HBox> this component can be used in a form...as done in the following extract of code (more SwapList in a form): ... <mx:Form width="100%" height="100%"> <mx:FormItem label="Set of fruit:" width="100%"> <components:SwapList id="FruitSelecton" dataProvider="{fruits}" labelField="descr"/> </mx:FormItem> <mx:FormItem label="Set of car:" width="100%"> <components:SwapList id="CarSelection" dataProvider="{cars}" labelField="dsecr"/> </mx:FormItem> </mx:Form> ... ...in this example user can drag a car from a List of available car (in the SwapList CarSelection) and drop it in the List of selected fruits! (in the SwapList FruitSelection) :-((( and my objective is avoid this kind of selection (using some event to know if the dragged item comes from the same instance of swaplist component e.g.) THANKS SALUTI Lorenzo
