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CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

i'll try it. Thanks!

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

it seems to fit my problem

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

Hmm

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

I don't quite understand what does this command do

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

I'm pretty sure that it violates the MVVM pattern but I hope my teachers accept that

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

and in my viewmodel I'm working with Tree_View

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

and XAML code for TreeView tag is

<TreeView Grid.Column="0" Grid.Row="1" x:Name="tree1" ItemsSource="{Binding GRZ_and_OBL}"
                  TreeViewItem.Selected="OnTreeItemSelected">

<TreeView Grid.Column="0" Grid.Row="1" x:Name="tree1" ItemsSource="{Binding GRZ_and_OBL}"
                  TreeViewItem.Selected="OnTreeItemSelected">

So when the item is selected, treeview is copied in my MainWindowViewModel

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

Best thing I could do is:

private void OnTreeItemSelected(object sender, RoutedEventArgs e)
        {
            if (sender is TreeView trVw)
            {
                this.MWVM.Tree_View = trVw;

                if (trVw.SelectedItem is SubjectModel SM)
                    this.MWVM.SelectedSubject = SM;
                else if (trVw.SelectedItem is TreeItemViewModel)
                    this.MWVM.SelectedSubject = null;
            }
        }

private void OnTreeItemSelected(object sender, RoutedEventArgs e)
        {
            if (sender is TreeView trVw)
            {
                this.MWVM.Tree_View = trVw;

                if (trVw.SelectedItem is SubjectModel SM)
                    this.MWVM.SelectedSubject = SM;
                else if (trVw.SelectedItem is TreeItemViewModel)
                    this.MWVM.SelectedSubject = null;
            }
        }

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

Just iterate through all OC's until the subject itself is found?

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

But there is now another problem. Let's say I choose a subject (Astana city for example). How do I access it using TreeView?

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

public class RelayCommand : ICommand
    {
        public event EventHandler CanExecuteChanged
        {
            add => CommandManager.RequerySuggested += value;
            remove => CommandManager.RequerySuggested -= value;
        }

        private Action<object> execute;
        private Func<object, bool> canExecute;

        public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
        {
            this.execute = execute;
            this.canExecute = canExecute;
        }

        public bool CanExecute(object parameter)
            => this.canExecute == null || this.canExecute(parameter);
        public void Execute(object parameter)
            => this.execute(parameter);
    }

public class RelayCommand : ICommand
    {
        public event EventHandler CanExecuteChanged
        {
            add => CommandManager.RequerySuggested += value;
            remove => CommandManager.RequerySuggested -= value;
        }

        private Action<object> execute;
        private Func<object, bool> canExecute;

        public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
        {
            this.execute = execute;
            this.canExecute = canExecute;
        }

        public bool CanExecute(object parameter)
            => this.canExecute == null || this.canExecute(parameter);
        public void Execute(object parameter)
            => this.execute(parameter);
    }

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

and redid commands thing. I found RelayCommand implementation and it works fine for me

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

Hi. I've tried the next thing: I created an ObservableCollection (let's call it OC) of TreeItemViewModel (TIVM) and inside the TIVM class there is OC<SubjectModel> of actual Subjects and string SubjectType {get;set;}

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

What is the propriate way to write a command for that? So when I click on a button (or any other thing that supports command implementation), object from that collection is taken and shown on the window (somewhere on Grid.Column="1")

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

Cities here is ObservableCollection<Subject>

38 replies

CC#

•Created by PepeGak on 12/14/2023 in #help

✅ How to handle commands in TreeView?

I tried this

<TreeView Grid.Column="0">
  <TreeViewItem Header="Cities" ItemsSource="{Binding Cities}">
    <TreeViewItem.ItemTemplate>
      <HierarchicalDataTemplate>
        <Button Content="{Binding SubjectName}"
            Command="{Binding ShowSubject}"/>
      </HierarchicalDataTemplate>
    </TreeViewItem.ItemTemplate>
  </TreeViewItem>
    <!--Same for oblasts, I guess-->
</TreeView>

<TreeView Grid.Column="0">
  <TreeViewItem Header="Cities" ItemsSource="{Binding Cities}">
    <TreeViewItem.ItemTemplate>
      <HierarchicalDataTemplate>
        <Button Content="{Binding SubjectName}"
            Command="{Binding ShowSubject}"/>
      </HierarchicalDataTemplate>
    </TreeViewItem.ItemTemplate>
  </TreeViewItem>
    <!--Same for oblasts, I guess-->
</TreeView>

but it doesn't seem to work

38 replies

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