GazpromApp/Views/EditEquipmentDialog.axaml.cs

using System;
using Avalonia.Controls;
using CommunityToolkit.Mvvm.Messaging;
using GazpromApp.Messages;
using GazpromApp.ViewModels;

namespace GazpromApp.Views;

public partial class EditEquipmentDialog : Window
{
    public EditEquipmentDialog()
    {
        InitializeComponent();
        
        if (Design.IsDesignMode)
            return;
        
        // view image
        WeakReferenceMessenger.Default.Register<EditEquipmentDialog, ViewImageMessage>(this, static (w, m) =>
        {
            var dialog = new ImageView
            {
                DataContext = m.Image
            };
            m.Reply(dialog.ShowDialog<ImageViewModel?>(w));
        });
        
        // error handling
        WeakReferenceMessenger.Default.Register<EditEquipmentDialog, ErrorMessage>(this, static (w, m) =>
        {
            var dialog = new ErrorView
            {
                DataContext = m.Error
            };
            m.Reply(dialog.ShowDialog<ErrorViewModel?>(w));
        });
        
        // complete editing equipment
        WeakReferenceMessenger.Default.Register<EditEquipmentDialog, EditEquipmentDone>(this, static (w, m) =>
        {
            w.Close(m.Equipment);
        });
    }

    private void Window_OnClosing(object? sender, WindowClosingEventArgs e)
    {
        if (DataContext is EditEquipmentDialogViewModel { IsClosed: false } vm)
            vm.CancelEditCommand.Execute(this);
    }

    private void Window_OnClosed(object? sender, EventArgs e)
    {
        WeakReferenceMessenger.Default.Unregister<ViewImageMessage>(this);
        WeakReferenceMessenger.Default.Unregister<ErrorMessage>(this);
        WeakReferenceMessenger.Default.Unregister<EditEquipmentDone>(this);
    }
}