Getting a TreeviewItem and more !!

[Robin Verhulst]

Ive been having these problems for a long time and i'm starting to get desperate. I'm gonna try to explain the assignment so you can maybe give a good solution.

I'm creating a silverlight app to display Assets into a GISMAP.To do this i load them into a Radtreeview.
Now because i have to use Async webservices i can't use my recursive method anymore and i can only show 1 parent with his children ( PROBLEM 1)
first i get the requested asset

 void OnGetAssetSimpleCompleted(object sender, GetAssetSimpleCompletedEventArgs e)
        {
            SimpleAssetData parent = e.Result;
            tvAssetOverview.Items.Add(parent);
            RadTreeViewItem parentTree = tvAssetOverview.ItemContainerGenerator.ContainerFromIndex(0) as RadTreeViewItem;
            // kinderen ophalen

            assetProxy.GetChildrenSimpleAsync(_assetID, _assetType);
        }

this is my completed eventhandler in which i get the children from that parent

 void OnGetChildrenSimpleCompleted(object sender2, GetChildrenSimpleCompletedEventArgs e2)
        {
            if (currentItem == null)
            {
                currentItem = tvAssetOverview.ItemContainerGenerator.ContainerFromIndex(0) as RadTreeViewItem;
            }
            SimpleAssetData asset2 = currentItem.Item as SimpleAssetData;
            currentItem.DefaultImageSrc = "Images/" + asset2.AssetType.ToString() + ".png";
            currentItem.IsLoadingOnDemand = false;
            foreach (SimpleAssetData asset in e2.Result)
            {
                currentItem.Items.Add(asset);
            }

            tvAssetOverview.ExpandAll();

            currentItem = null;
            CheckItems();
        }

Then i want to load pictures for every asset in the treeview and enable loadondemand for every asset that has children ( i included a property HasChildren in the SimpleAssetData object to make it easier )  ( PROBLEM 2 )

i tried alot

RadTreeViewItem parentItem = tvAssetOverview.ItemContainerGenerator.ContainerFromIndex(0) as RadTreeViewItem;
            string path = "";

            foreach (SimpleAssetData item in parentItem.ItemsSource)
            {
                path = parentItem.ToString() + "|" +  item.ToString();
                RadTreeViewItem treeViewItem = tvAssetOverview.GetItemByPath(path);
                treeViewItem.DefaultImageSrc = "Images/" + item.AssetType.ToString() + ".png";
            }

does not work

   RadTreeViewItem parentItem = tvAssetOverview.ItemContainerGenerator.ContainerFromIndex(0) as RadTreeViewItem;
            for (int i = 0; i < parentItem.Items.Count; i++)
            {
                RadTreeViewItem childItem = parentItem.ItemContainerGenerator.ContainerFromIndex(i) as RadTreeViewItem;
                //SimpleAssetData assetData = childItem.Item as SimpleAssetData;
                //childItem.DefaultImageSrc = "Images/" + assetData.AssetType.ToString() + ".png";
                if ((childItem.Item as SimpleAssetData).HasChildren == true)
                {
                    childItem.IsLoadingOnDemand = true;
                }
            }

doesn't work either

Please Help

[Kiril Stanoev]

Hello Robin,

I'm not sure that I fully understand what the )1 issue is. Could you please elaborate a little bit more on the subject.
As for 2), why don't you use ContainerBindings to set the images. Give it a try and let me know how I can be of further assistance.

Kind regards,
Kiril Stanoev
the Telerik team

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[Robin Verhulst]

1. How would i bind the defaultimagesrc of the Radtreeview item to 'Images/' + SimpleAssetData.AssetType + '.png'       SimpleAssetData being the object inside the treeviewitem

2. The main issue is that i can't the the nodes under the parent node .

[Tina Stancheva]

Hi Robin Verhulst,

I noticed that you are using the ItemContainerGenerator to get the item containers. Please note that these containers will not be generated until needed (until visible), but you can handle the ItemContainerGenerator.StatusChanged event and be notified when they are generated.

Example code for getting the containers:

myTreeView.ItemContainerGenerator.StatusChanged += new EventHandler(ItemContainerGenerator_StatusChanged);

void ItemContainerGenerator_StatusChanged(object sender, EventArgs e)
  {
           if (myTreeView.ItemContainerGenerator.Status == GeneratorStatus.ContainersGenerated)
      {
          //the custom logic goes here
          //When the item is a direct child of the TreeView:
          tvAssetOverview.ItemContainerGenerator.ContainerFromItem(dataItem);

         //When the item is a descendant of the TreeView (i.e. child of a child...)
        tvAssetOverview.ContainerFromItemRecursive(dataItem);
      }
  }

After you get the items container you need you should be able to set the DefaultImageSrc like you do.

Is the ItemContainerGenerator generated when you are accessing  the containers? Also, you can go through those threads here, they might be helful.

Let us know if this is the problem. Also, if this information doesn't help, if you can send us your project or a sample project reproducing your issues, we will investigate them further and help you implement your scenario.

Regards,
Tina Stancheva
the Telerik team

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