As does not accept drag and drop unaccept and custom drag and drop indicator dropindicatorskin

In as, the following options are supported: dragmanager. acceptdragdrop (uicomponent); In the dragenter event.

To selectively accept drag and drop based on the conditions:

If () // accept

Dragmanager. acceptdragdrop (uicomponent );

Else // not accepted

Dragmanager. acceptdragdrop (event. draginitiator );

 

About the custom dropindicatorskin:

Package components <br/>{</P> <p> Import flash. display. graphics; </P> <p> Import MX. controls. alert; <br/> Import MX. skins. programmaticskin; </P> <p>/** <br/> * the skin for the drop indicator of a list-based control. <br/> */<br/> public class listdropindicator extends programmaticskin <br/>{</P> <p> // optional <br/> // <br/> // constructor <br/> // operator </P> <p>/** <br/> * constructor. <br/> */<br/> Public Function listdropindicator () <br/> {<br/> super (); <br/>}</P> <p> // specify <br/> // overridden methods <br/> // <br/>/ /configure </P> <p>/** <br/> * @ private <br/> */<br/> override protected function updatedisplaylist (W: number, H: Number): void <br/>{< br/> super. updatedisplaylist (W, H); </P> <p> var G: Graphics = graphics; </P> <p> G. clear (); <br/> G. beginfill (0xa1bde2, 0.5); <br/> G. drawrect (-50,-1, W + 50, 23); <br/>}< br/>}

 <Mx: Tree x = "774" Y = "343" id = "Tree" dataprovider = "{employees. type} "labelfield =" @ name "width =" 280 "Height =" 167 "<br/> dragenabled =" true "dropindicatorskin =" components. listdropindicator "dropenabled =" true "<br/> dragenter =" tree_dragenterhandler (event) "dragover =" tree_dragoverhandler (event) "<br/> dragcomplete =" tree_dragcompletehandler (Event) "dragexit =" tree_dragexithandler (event) "> <br/>/** <br/> * As shown in If dropenabled = true is set for the tree, then dragmanager. acceptdragdrop (tree) is only available in event. preventdefault () takes effect <br/> * tree. showdropfeedback (event) displays the drag and drop indicator. It can be used together with dragmanager. showfeedback (dragmanager. Link) <br/> * showdropfeedback (event) is a horizontal line by default. <Br/> **/<br/> protected function tree_dragenterhandler (Event: dragevent): void <br/>{< br/> event. preventdefault (); <br/> dragmanager. acceptdragdrop (tree); <br/> tree. showdropfeedback (event); <br/>}< br/> protected function tree_dragoverhandler (Event: dragevent): void <br/>{< br/> event. preventdefault (); <br/> tree. showdropfeedback (event); <br/>}< br/> protected function tree_dragcompletehandler (Event: dragevent): void <br/>{< br/> event. preventdefault (); <br/> tree. hidedropfeedback (event); <br/>}< br/>/** <br/> * Similarly, if you set dropenabled = true, showdropfeedback (Event) it must be in the event. preventdefault () takes effect <br/> **/<br/> protected function tree_dragexithandler (Event: dragevent): void <br/>{< br/> tree. hidedropfeedback (event); <br/>}