[flexdev] DragOver e Tree

Fri, 11 May 2007 08:22:43 -0700 

Pessoal,

Estou com uma dúvida com um DragOver que não exibe o showFeedback como
DragManager.NONE no DragManager. A idéia que apenas determinados tipos
de nodes possam receber um "drop", no código abaixo apenas
'courses'podem receber 'modules'.

Segue meu código que foi baseado no último exemplo no link:
http://www.adobe.com/devnet/flex/quickstart/working_with_tree/

Agradeço qualquer ajuda.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="absolute" 
initialize="onInit()">
        <mx:Script>
                <![CDATA[
                        import mx.core.DragSource;
                        import mx.managers.DragManager;
                        import mx.events.DragEvent;
                        import mx.collections.XMLListCollection;

                        private const FOLDER:String = "folder";
                        private const COURSE:String = "course";
                        private const MODULE:String = "module";
                        
                        [Bindable]
                        private var coursesList:XML = 
                                        <list><node objectID="6" name="CF" 
parentID="1" recordType="course"><node objectID="7" name="CFC" parentID="6" 
recordType="module"/><node objectID="8" name="CFAdmin" parentID="6" 
recordType="module"/><node objectID="9" name="CFML" parentID="6" 
recordType="module"/><node objectID="10" name="CFSCRIPT" parentID="6" 
recordType="module"/></node><node objectID="2" name="DataBase" parentID="1" 
recordType="folder"><node objectID="3" name="Oracle" parentID="2" 
recordType="course"><node objectID="4" name="PLSQL" parentID="3" 
recordType="module"/><node objectID="5" name="SP" parentID="3" 
recordType="module"/></node></node></list> ;
                        
                        [Bindable]
                        private var courses:XMLListCollection;
                        
                        private function onInit():void
                        {
                                courses = new 
XMLListCollection(coursesList.node);
                        }

                        private function treeNodeLabelFunction(item:XML):String
                        {
                                return [EMAIL PROTECTED] + " (" + [EMAIL 
PROTECTED] + ")";
                        }
                        
                        private function onDragOver(event:DragEvent):void
                        {
                                // r is the visible index in the tree
                                var dropTarget:Tree = Tree(event.currentTarget);
                                var r:int = 
dropTarget.calculateDropIndex(event);
                                myTree.selectedIndex = r;
                                
                                // retrieving the newly selected node, you can 
examine it and decide to tell
                                // the user the drop is invalid by changing the 
feedback.
                                var node:XML = myTree.selectedItem as XML;
                                if( [EMAIL PROTECTED] != COURSE ) {
                                        
DragManager.showFeedback(DragManager.NONE);
                                        tiTemp.text = "denied";
                                        return;
                                }
                                else
                                {
                                        tiTemp.text = "allow";
                                }
                                
                                // the type of drop - copy, link, or move can 
be reflected in the feedback as well.
                                // Here the control and shift keys determine 
that action.
                                if (event.ctrlKey)
                                DragManager.showFeedback(DragManager.COPY);
                                else if (event.shiftKey)
                                DragManager.showFeedback(DragManager.LINK);
                                else {
                                DragManager.showFeedback(DragManager.MOVE);
                                }
                        }
                        
                        private function onDragDrop(event:DragEvent):void
                        {

                        }
                ]]>
        </mx:Script>

        <mx:Tree id="myTree" dataProvider="{courses}" 
labelFunction="treeNodeLabelFunction" 
                dragEnabled="true" dragMoveEnabled="true" dropEnabled="true"
                dragOver="onDragOver(event)"
        dragDrop="onDragDrop(event)"
                width="200" showRoot="false" height="300"/>
        
        <mx:TextInput id="tiUpNode" text="[EMAIL PROTECTED]" y="103" x="208"/>
        <mx:TextInput id="tiTemp" y="142" x="208"/>
        
</mx:Application>


-- 
Hamad Amaral
[EMAIL PROTECTED]


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