MultiTerm/MultiTerm.Core/ViewModel/TerminalViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

namespace MultiTerm.Core.ViewModel;

public abstract partial class TerminalViewModel : ObservableObject, ITerminalViewModel
{
    public abstract string Title { get; }

    public event EventHandler? ClosingEvent;

    /// <summary>
    /// Method to override if any closing actions are required.
    /// Closing can be cancelled using the return value.
    /// </summary>
    /// <returns>true if closing is allowed. false if it shall be cancelled.</returns>
    protected virtual bool ClosingActions() { return true; }

    [RelayCommand]
    public void CloseRequest()
    {
        if (this.ClosingActions() == true)
        {
            ClosingEvent?.Invoke(this, EventArgs.Empty);
        }
    }
}