Transfer tree control to subprogram as XML

I've been pretty happy with the labview tree control except that there doensn't seem to be a method for transferring a complete tree from one vi to another. I finally wrote some functions for converting a tree to/from an xml string. To convert to xml, pass the tree refnum to the subvi and out comes xml. To convert back to a new tree, pass a refnum for a new tree and the xml string. I haven't done any optimization for speed or flexibility, (no documentation yet either) but it works pretty well. The attached code has everything you need - I hope someone else will find this useful. I'd love feedback if anyone tries it.
thanks,
George
Attachments:
tree-xml.zip ‏86 KB

Hi, George,
thank you for your answer. I use LabView tree and work with LabView 2013, maybe the tree itself is not uptodate, but after casting it works, I suppose, that it is just the XML string which you expect to get. I made an XML -display VI using LabView tools from the corresponding library - they are going from node to node getting names and attributes. As a result a tree with 2 columns is displayed. I can send you this VI to have a look at it.
I found and loaded TestConfiguration.xml, it can be also displayed with my VI, though it uses XSD - my original file doesn't have any XSD, that#s why it may be differen in your solution and in what I have to do.
I took my tree, "casted" it to your ref and than used "LoadXML" from the XML palett of LabView. I got the parsing error "Line 2, Column 2, Message: Expected an element name", maybe that means, that some header info is not correct.
As I see from you VI you convert the tree to an XML- string, and then you can save this string in a file, right? I thought of creating an XML -structure with nodes and attributes just from the tree, but obviously it is a very complicated way, isn't it? My problem is to save changes, which a user has done editing the Tree - it seems to be the simplest way to write donw the TREE completely in an XML file, because the tree has all the info. But maybe this way can#t be gone at all :-(.
Please find attached the VI to display an XML file in a tree with 2 columns. I used this display form as an XML Notepad 2007 does it.
Thanks
Attachments:
DisplayXMLFileAsTreeExample.vi ‏49 KB
DisplayXML.lvproj ‏3 KB

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For some reason the attachment did not go through. Re-attaching ...
Attachments:
Tree Transfer.zip ‏16 KB

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            import mx.utils.ObjectUtil;
            import mx.collections.ICollectionView;
            import mx.core.UIComponent;
            import mx.managers.DragManager;
            import mx.events.DragEvent;
            import mx.controls.Alert;
            import mx.controls.Label;
            import mx.events.CloseEvent;
            private var homePath:String="/home/e311394/dndTest/";
            private var destPath:String="/home/e311394/dndDest/";
            private var eid:String="e311394";
            private var actn:String;
            [Bindable]
            private var cm:ContextMenu;
            private var cmi:ContextMenuItem;
            [Bindable]
            private var dp:ArrayCollection;
            private function init():void
                cmi=new ContextMenuItem("Remove");
                cmi.enabled=true;
                cmi.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT, contextMenuItem_menuItemSelect);
                cm=new ContextMenu();
                cm.hideBuiltInItems();
                cm.customItems=[cmi];
                cm.addEventListener(ContextMenuEvent.MENU_SELECT, contextMenuItem_menuSelect);
                list.contextMenu=cm;
            private function contextMenuItem_menuSelect(evt:ContextMenuEvent):void
                list.selectedIndex=lastRollOverIndex;
            private function contextMenuItem_menuItemSelect(evt:ContextMenuEvent):void
                var loclSelectedRow:Object=list.selectedItem;
                var lostrSelectedMenuItem:String;
                lostrSelectedMenuItem=evt.target.caption;
                if (loclSelectedRow != null)
                    var obj:Object=new Object()
                    obj.label=loclSelectedRow.label as String;
                        //Alert.show(obj.label);
                if (lostrSelectedMenuItem == "Remove")
                    if(loclSelectedRow!=null)
                    var pth:String=homePath.concat(loclSelectedRow.label);
                    //Alert.show(pth);
                    //FlexDnDRemoteService.process(eid,"delete",pth,"-");
                    var coll:ArrayCollection=list.dataProvider as ArrayCollection;
                    if (coll.contains(loclSelectedRow))
                        coll.removeItemAt(coll.getItemIndex(loclSelectedRow));
            public function onTreeDragEnter(event:DragEvent):void
                event.preventDefault();
                DragManager.acceptDragDrop(event.target as UIComponent);
                tree.showDropFeedback(event);
            protected function onTreeDragOver(event:DragEvent):void
                event.preventDefault();
                event.currentTarget.hideDropFeedback(event);
                try
                    var index:int=tree.calculateDropIndex(event);
                catch (e:Error)
                    DragManager.showFeedback(DragManager.NONE);
                    return;
                tree.selectedIndex=index;
                var draggedOverItem:Object=tree.selectedItem;
            public function onTreeDragExit(event:DragEvent):void
                event.preventDefault();
                tree.hideDropFeedback(event);
            private function showAlert():void
                Alert.yesLabel="Move";
                Alert.noLabel="Copy";
                Alert.buttonWidth=70;
                Alert.show("Copy / Move ?", "Confirm", Alert.YES | Alert.NO | Alert.CANCEL, this, alertListener, null, Alert.OK);
            private function alertListener(eventObj:CloseEvent):void
                var result:Boolean=false;
                if (eventObj.detail == Alert.CANCEL)
                    //Alert.show("CANCEL");
                    return;
                if (eventObj.detail == Alert.YES)
                    //Alert.show("YES");
                    result=true;
                else if (eventObj.detail == Alert.NO)
                    //Alert.show("NO");
                    result=false;
                var index:int=tree.calculateDropIndex(treedropevt);
                //Alert.show("Drop Pos" + index.toString());
                /* var treeList:ArrayCollection=tree.dataProvider as ArrayCollection;
                   Alert.show(" index"+index+"Length "+treeList.length);
                   if(index > treeList.length)
                   Alert.show("Returning");
                   return;
                var items:Array=new Array();
                if (treedropevt.dragSource.hasFormat("items"))
                    items=items.concat(treedropevt.dragSource.dataForFormat("items") as Array);
                var parentItem:Object;
                parentItem=getObjectTarget();
                /* if (tree.dataDescriptor.isBranch(tree.indexToItemRenderer(index).data))
                   parentItem=tree.indexToItemRenderer(index).data;
                   else
                   var dropParentPackage:Object = tree.mx_internal::_dropData.parent as Object;
                   Alert.show("HAck"+dropParentPackage.toString());
                   parentItem=tree.getParentItem(tree.indexToItemRenderer(index).data);
                   //Alert.show("Lenght "+ObjectUtil.getClassInfo(parentItem).properties.length);
                //Alert.show("Lenght "+ObjectUtil.getClassInfo(parentItem).properties.length);
                var position:int=0;
                /* if(ObjectUtil.getClassInfo(parentItem).properties.length==0)
                   Alert.show("Returning");
                   return;
                if (parentItem != null)
                    try
                        while (tree.indexToItemRenderer(index).data != parentItem)
                            //Alert.show(tree.indexToItemRenderer(index).data.toString());
                            if (index > 0)
                                index--;
                            //Alert.show("Insiade");
                            position++;
                    catch (e:Error)
                        Alert.show("Catch" + index.toString());
                        return;
                for each (var item:Object in items)
                    var obj:Object=new Object()
                    obj.label=item.label as String;
                    if (parentItem != null)
                        //Alert.show("ADDED");
                        tree.dataDescriptor.addChildAt(parentItem, obj, position++);
                    else
                        //Alert.show("PARENT NULL");
                        tree.dataDescriptor.addChildAt(tree.selectedItem, obj, position++);
                    var spth:String=homePath.concat(item.label);
                    //Alert.show(spth);
                    var dpth:String=destPath.concat(item.label);
                    //Alert.show(dpth);
                    if (result == true)
                        removeItems();
                            //FlexDnDRemoteService.process(eid,"move",spth,dpth);
                    else
                        //FlexDnDRemoteService.process(eid,"copy",spth,dpth);
                    tree.validateNow();
            public function getObjectTarget():Object
                var dropData:Object=tree.mx_internal::_dropData as Object;
                if (dropData.parent != null)
                    return dropData.parent;
                else
                    // if there is not parent (root of the tree), I take the root directly
                    var renderer:IListItemRenderer=tree.indexToItemRenderer(0);
                    return renderer.data;
            public function removeItems():void
                //remove moved elements
                var items:Array=treedropevt.dragSource.dataForFormat("items") as Array;
                var coll:ArrayCollection=list.dataProvider as ArrayCollection;
                for each (var item:Object in items)
                    if (coll.contains(item))
                        coll.removeItemAt(coll.getItemIndex(item));
            private var treedropevt:DragEvent;
            public function onTreeDragDrop(event:DragEvent):void
                treedropevt=event;
                showAlert();
                event.preventDefault();
                tree.hideDropFeedback(event);
            public function resultHandler(event:ResultEvent):void
                Alert.show("Success", "Status");
            public function faultHandler(event:FaultEvent):void
                Alert.show(event.fault.faultString, "Failure");
        ]]>
    </mx:Script>
    <mx:ArrayCollection id="listDP">
        <mx:Object label="File1.dnd"/>
        <mx:Object label="File2.dnd"/>
        <mx:Object label="File3.dnd"/>
        <mx:Object label="File4.dnd"/>
        <mx:Object label="File5.dnd"/>
    </mx:ArrayCollection>
    <mx:Number id="lastRollOverIndex"/>
    
    <mx:ArrayCollection id="treeDP">
        <mx:Object label="/dndDest">
            <mx:children>
                <mx:ArrayCollection>
                    <mx:Object label="sample1.ks"/>
                    <mx:Object label="sample2.ks"/>
                    <mx:Object label="sample3.ks"/>
                    <mx:Object label="sample4.ks"/>
                    <mx:Object label="sample5.ks"/>
                    <mx:Object label="sample6.ks"/>
                </mx:ArrayCollection>
            </mx:children>
        </mx:Object>
    </mx:ArrayCollection>
    <mx:List id="list"
             itemRollOver="lastRollOverIndex = event.rowIndex"
             width="50%"
             dragEnabled="true"
             dataProvider="{listDP}"
             labelField="label"
             allowMultipleSelection="true"
             dragMoveEnabled="false">
    </mx:List>
    <mx:Tree id="tree"
             width="50%"
             dragEnabled="true"
             dataProvider="{treeDP}"
             dragEnter="onTreeDragEnter(event)"
             dragOver="onTreeDragOver(event)"
             dragExit="onTreeDragExit(event)"
             dragDrop="onTreeDragDrop(event)"
             labelField="label"
             liveScrolling="true">
    </mx:Tree>
    <mx:RemoteObject id="FlexDnDRemoteService"
                     showBusyCursor="true"
                     destination="FlexDnD">
        <mx:method name="process"
                   result="resultHandler(event)"
                   fault="faultHandler(event)"/>
    </mx:RemoteObject>
</mx:Application>
Thanks,
Rajiv

Ya , i have searched and have used the same code.
But needed to customize few things like:
stop dnd in same tree
drop some item into a folder ..( onto it ) etc
have achieved the same .. but this issue ..
i think the tree dataprovider (contents internally is not being updated .. only the UI)
any suggestions ?
- Rajiv

Problem in setting default index in Tree Control

hi all,
i am using flex2.0 final release and in my application i am
calling custom function in cretionComplete event
which set the default index in Tree control...but its not
working properly in final flex meanwhile this same thing i am using
in flex beta3 ...at that time its working properly but the problem
occur only in migration time so can any body tell me what happaning
here...
code....//here MailFolderLists is id of tree control
[Bindable]
public var XLC:XML;
public function initList(event:Event) : void
if(mx.utils.ObjectUtil.toString(event.target.lastResult).indexOf("NOK")==-1)
XLC = event.target.lastResult;
if(MailFolderLists.selectedIndex==-1) //its working
MailFolderLists.selectedIndex=0; // its not working
so plz give me solution aasp..
thanks in advance

thanks buddy
ur suggestion work ....
one more thing i want to know if u have any idea related to
Tree.expandItem method it will work fine in beta3 but same prob not
work perfectly in final flex.....
i am using
MailFolderLists.expandItem(MailFolderLists.selectedItem,
true);
but not work every time i want the tree in expan position
every when i add and new node/folder into it..
so give me suggestion if u have any idea...
thanks

How to get access to Row Data (Child Text) in a Tree Control Pragmatically?

In LabVIEW 2010, I have entered Row Data into a Tree Control pragmatically using the Add Item method and providing the Child Text array and the Child Tag for the Row. When a Row in the Tree Control is selected, I can get the Row Tag in the Value Property of the Tree. But how do I access the Child Text array data when the Row is selected? I can't seem to find a Tree Control Property or Method that will return that data back again.
What I am trying to do is: once a Row in a Tree is selected and a button is pushed, if the Row Tag is valid, I want to transfer all of the Row data into another similarly formatted Tree. To do that I need the Row Data for the Tree and Row that was selected. I can not find a way to get access to this Row Data after it has been entered into the Tree.
Can anyone tell me how to pragmatically access the Child Text or Row Data in a Tree Control from a selected Row in the Tree? I have the Tag for the Row, but how do I access the data?
Thanks for your assistance.
Solved!
Go to Solution.

As mentioned in the posting here, you can use the Active Item:Tag property to set the item to which subsequent property changes apply. This includes pulling the Active Celltring values out in a for loop as you increment the Active Cell:Active Column Number to get the row's Child Text data programmatically as I was originally wanting to do.
Note that wiring a 0 to the ActiveColNum property and reading the String value will return the tree item's visible name (in column 0), but not the unique item Tag (which is somewhat intangible after its creation). Therefore, I save the unique item tag when I add the item to the tree control (the output of the Add Item invoke node) and store it as a separate column of the Child Text array and place it out of sight in the tree control so I have access to it later. It might be useful, it might not.
I find the tree control totally non-intuitive and not well explained anywhere, but that's how a lot of LabVIEW coding is I guess. Play with it long enough and you become an expert. I had to learn the hard way, but I hope this helps someone else.
-Richard
"Computers are useless. They can only give you answers." - Pablo Picasso

Transfer tree control to subprogram as XML

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