Halász Levente
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Halász Levente
asked on 19 Aug 2010, 06:16 AM
Hi,
I'd like to use RadTreeViewList with RIA, but my problem is that whenever I refresh the datasource the whole tree collapses. Is there a way to avoid this collapsing.
Thank you for your answer,
Levente
I'd like to use RadTreeViewList with RIA, but my problem is that whenever I refresh the datasource the whole tree collapses. Is there a way to avoid this collapsing.
Thank you for your answer,
Levente
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Hi Halász Levente,
Can you share more details about your refresh? Are you using a DomainDataSource and calling its Load() method?
If you are assigning a new ItemsSource RadTreeListView will recreate its internal expand/collapse storage mechanisms so you will have to restore the expand/collapse state on your own. If you want to avoid a possible solution is to you can use a single observable collection as ItemsSource.
Kind regards,
Stefan Dobrev
the Telerik team
Can you share more details about your refresh? Are you using a DomainDataSource and calling its Load() method?
If you are assigning a new ItemsSource RadTreeListView will recreate its internal expand/collapse storage mechanisms so you will have to restore the expand/collapse state on your own. If you want to avoid a possible solution is to you can use a single observable collection as ItemsSource.
Kind regards,
Stefan Dobrev
the Telerik team
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Halász Levente
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answered on 19 Aug 2010, 02:02 PM
Hi Stefan,
I'm using DomainDataSource and I'm calling it's load method, with LoadBehavior.MergeIntoCurrent, so there is no reassignment of ItemsSource.
I fount a possible work around, by writing a Behavior which binds the rows IsExpanded property to a list to store which elements were expanded before datasource refresh. The problem is that when I set IsExpanded back to true, after datasource refresh (to restore the initial tree) the treeviewlist doesn't render correctly (it has white areas instead of my structure). If I call ExpandHierarchyItem method, then it is OK. It also renders correctly if I resize the treeviewlist control.
I'm using DomainDataSource and I'm calling it's load method, with LoadBehavior.MergeIntoCurrent, so there is no reassignment of ItemsSource.
I fount a possible work around, by writing a Behavior which binds the rows IsExpanded property to a list to store which elements were expanded before datasource refresh. The problem is that when I set IsExpanded back to true, after datasource refresh (to restore the initial tree) the treeviewlist doesn't render correctly (it has white areas instead of my structure). If I call ExpandHierarchyItem method, then it is OK. It also renders correctly if I resize the treeviewlist control.
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Halász Levente
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answered on 19 Aug 2010, 03:38 PM
I also noticed, that the treelistview collapses no matter what I do with the items source (even if I don't touch it) as soon it receives NotifyPropertyChanged.
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Hello Halász ,
Looking at the internals of RadTreeListView it seems that whenever an item is removed from the source collection it is collapsed in the internal storage of the control, so an extra step to expand it back is necessary when this item comes back in the items source.
Best wishes,
Stefan Dobrev
the Telerik team
Looking at the internals of RadTreeListView it seems that whenever an item is removed from the source collection it is collapsed in the internal storage of the control, so an extra step to expand it back is necessary when this item comes back in the items source.
Best wishes,
Stefan Dobrev
the Telerik team
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Halász Levente
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answered on 25 Aug 2010, 10:58 AM
Thank you for your answer. The is unfortunate, however I rewrote the whole stuff and using ObservableCollection now as data source. It works OK.