SelectedTreeItem

[Forstmeier Peter]

Hi all togehter,

i use the TreeViewAdv Control in my WPF Application.

<ScrollViewer Grid.Row="1">
            
            <syncfusion:TreeViewAdv x:Name="Tree"
                

                ItemsSource="{Binding ProjectsView}"
                SelectedTreeItem="{Binding SelectedProject,Mode=TwoWay}"
                AllowMultiSelect="False"
        
                SelectionChanged="Tree_SelectionChanged"
            >
                
                <syncfusion:TreeViewAdv.ItemTemplate>
                    <HierarchicalDataTemplate ItemsSource="{Binding SubProjects}" >
                        <ContentControl Content="{Binding}"
                                        ContentTemplate="{StaticResource ProjectsSelectionTemplate}" />
                    </HierarchicalDataTemplate>
                </syncfusion:TreeViewAdv.ItemTemplate


                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="MouseDoubleClick">
                        <i:InvokeCommandAction
                            Command="{Binding EntitySelectedCommand,diag:PresentationTraceSources.TraceLevel=High}" >
                        </i:InvokeCommandAction>
                    </i:EventTrigger>
                </i:Interaction.Triggers>
            </syncfusion:TreeViewAdv>
        </ScrollViewer>

Part of ViewModel wher PrpjectsView i typeop ICollectionView

ProjectDto _selectedProject;
        public ProjectDto SelectedProject {
            get {return _selectedProject;}
            set {
                
                SetProperty(ref _selectedProject,value);
                System.Threading.Thread.Sleep(500);
                if (SelectedProject != null) {
                    Console.WriteLine("Selected {0}",SelectedProject.ProjectName);
                    ProjectsView.MoveCurrentTo(SelectedProject);
                }
            }
        }

When i scroll down the Tree an click an Item, the SelectedTreeItem changes, but, the Tree always jump to the first position.

This works only with he line 'Thread.Sleep(500). If i comment out this line, the tree scrolls only to the first position, so there is no selection.

Any ideas?

Thanks

Peter

[Forstmeier Peter]

Hi,

me again.

is nobody outside who can help me.

This is a very serious problem i i never see this behavior bevore.

Thanks

Peter

[Venkateshwaran Ramdoss]

Hi Peter,   

  

Thank you for contacting Syncfusion Support.   

  

We have validated this reported behavior and it has a problem with AutoScrolling functionality in ScrollViewer control. It has been discussed in below MSDN article.    

   

Link: https://social.msdn.microsoft.com/Forums/vstudio/en-US/bab3fb62-bf9e-4db6-854c-829bd2896319/how-to-prevent-scrollviewer-from-calling-bringintoview?forum=wpf    

   

As explained in above MSDN article, this reported behavior can be resolved handling RequestBringIntoView event. Kindly make use of the below code example for your reference.   

   

Code example   

   

XAML   

   

<syncfusion:TreeViewAdv  x:Name="TreeView"RequestBringIntoView="TreeView_RequestBringIntoView"    

ItemsSource="{Binding Customers}" SelectedTreeItem="{BindingSelectedTreeItem,Mode=TwoWay}">   

   

   

C#   

   

private void TreeView_RequestBringIntoView(object sender, RequestBringIntoViewEventArgse)   

        {   

            e.Handled = true;   

        }   

   

   

We have also prepared sample and video for your reference and it can be downloaded from the below link.   

   

Sample: TreeViewAdv_ScrollerViewerSample    

  

Video: TreeViewScrollerViewVideo    

  

Please check the above solution and let us know if it is helpful.   

  

Regards,   

Venkateshwaran V.R.   

 

[Forstmeier Peter]

Works perfectly

Thanks a lot

Peter

[Vijayalakshmi Roopkumar]

Hi Peter

Thank you for your update.

Please let us know if you need any further assistance on this.

Regards,
Vijayalakshmi V.R.