WPF display content based on treeview selected item

Question

I was able to retrieve selected item value from my treeview. Now I want to change the content in ScrollViewer control based on that value. I'm trying to display property values of Facility object which contains Containments which contains Tanks.

I'm new to programming sorry if my explanation is not clear enough. Thank you.

MyWindow.xaml


    


    
        
            
                
                
            
            
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
        
    
    
        
            
                
                
            
            
                
                
                
                
                
                
                
                
                
                
                
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
        
    
    
        
            
                
                
            
            
                
                
                
                
                
                
                
                
                
                
                
                
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
            
        
    


    
        
        
    
    
        
        
    
    
        
            
        
        
            
                
            
        
    
    
               DataTemplate here

MyWindowViewModel.cs

public class VisioFacilityExportViewModel : INotifyPropertyChanged
{
    public VisioFacilityExportViewModel()
    {
        _lstFacilities = new ObservableCollection(DatabaseHandler.GetFacilities().Where(f => f.FacilityID == 2015012314001933));
        _lstContainments = _lstFacilities[0].Containment;
        _lstTanks = _lstContainments[0].Tanks;
        List lstRoot = new List();
        List lstContainment = new List();
        List lstTanks = new List();
        MenuItems = new List();
        foreach (var f in _lstFacilities)
        {
            foreach (var c in f.Containment)
            {
                lstTanks.AddRange(c.Tanks.Select(t => new MenuItemCust { Name = t.Name, Info = "Tanks"}));
                lstContainment.Add(new MenuItemCust { Name = c.Name, Children = lstTanks, Info = "Containment" });
            }
            lstRoot.Add(new MenuItemCust { Name = "Containment", Children = lstContainment, Info = "Facility"});
            MenuItems.Add(new MenuItemCust { Name = "Facility", Children = lstRoot });
        }
    }

    private ObservableCollection _lstTanks;
    public ObservableCollection ListTanks
    {
        get { return _lstTanks; }
        set
        {
            _lstTanks = value;
            NotifyPropertyChanged("ListTanks");
        }
    }

    private ObservableCollection _lstContainments;
    public ObservableCollection ListContainments
    {
        get { return _lstContainments; }
        set
        {
            _lstContainments = value;
            NotifyPropertyChanged("ListContainments");
        }
    }

    private ObservableCollection _lstFacilities;
    public ObservableCollection ListFacilities
    {
        get { return _lstFacilities; }
        set
        {
            _lstFacilities = value;
            NotifyPropertyChanged("ListFacilities");
        }
    }
    private List _menuItems;
    public List MenuItems
    {
        get { return _menuItems; }
        set
        {
            _menuItems = value;
            NotifyPropertyChanged("MenuItems");
        }
    }

    private static object _selectedItem = null;
    public static object SelectedItem
    {
        get { return _selectedItem; }
        private set
        {
            if (_selectedItem != value)
            {
                _selectedItem = value;
                OnSelectedItemChanged();
            }
        }
    }

    public static void OnSelectedItemChanged()
    {
        var item = (MenuItemCust) SelectedItem;
        if (item.Name == "Facility")
        {

        }
        else if (item.Info == "Containment")
        {

        }
        else if (item.Info == "Tanks")
        {

        }
    }
    #region iNotifyPropertyChanged
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void NotifyPropertyChanged(string property)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(property));
    }
    #endregion
}

Guillaume · Accepted Answer

I think what you want to do is display informations in a UserControl which will contains a grid with differents controls like textblock and textbox. So you are going to create a new UserControl named FacilityView and FacilityViewModel and the FacilityView will contains a grid with ur Facility Ojbect property First of all, I would create an property in MyWindowViewModel called

private Facility currentFacility;

public Facility CurrentFacility
{
 get{return currentFacility;}
 set{ currentFacility = value ;
 notifyPropertyChange("CurrentFacility")    
}

In your MainWindowsView (xaml)

And in your SelectedItem you would

if (selectedItem is Facility)
{
CurrentFacility = new FacilityViewModel(selectedItem as Facility);     
}

Sry for the bad indentation im not use to this writing code.

EDIT2:

Okay, you have 2 choice, first of all u can create a BaseViewModel which will implements INotifyPropertyChanged.

FacilityViewModel : BaseViewModel

TankViewModel : BaseViewModel

ContainmentViewModel : BaseViewModel

This way you will change CurrentFacilityViewModel to CurrentBaseViewModel

private BaseViewModel currentBaseXXX;

public BaseViewModel CurrentBaseXXX
{
 get{return currentBaseXXX;}
 set{ currentBaseXXX= value ;
 notifyPropertyChange("CurrentBaseXXX")    
}

And in your SelectedItem you would

if (selectedItem is Facility)
{
CurrentBaseXXX= new FacilityViewModel(selectedItem as Facility);     
}
if (selectedItem is Tank)
{
CurrentBaseXXX= new TankViewModel(selectedItem as Tank);     
}
if (selectedItem is Containers)
{
CurrentBaseXXX= new ContainersViewModel(selectedItem as Containers);     
}

Options2

You would have 3 current so

CurrentFacilityVM

CurrentTankVM

CurrentContainerVM

And in your SelectedItem you would

CurrentFacilityVM = null;

CurrentTankVM =null;

CurrentContainerVM =null;
if (selectedItem is Facility)
{
CurrentFacilityVM = new FacilityViewModel(selectedItem as Facility);     
}
if (selectedItem is Tank)
{
CurrentTankVM = new TankViewModel(selectedItem as Tank);     
}
if (selectedItem is Containers)
{
CurrentContainerVM = new ContainersViewModel(selectedItem as Containers);     
}

WPF display content based on treeview selected item

Answers (2)

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