FModel/FModel/Views/ModelViewer.xaml.cs

using System.ComponentModel;
using System.Windows;
using System.Windows.Input;
using AdonisUI.Controls;
using CUE4Parse.UE4.Assets.Exports;
using CUE4Parse.UE4.Assets.Exports.Material;
using FModel.Services;
using FModel.Settings;
using FModel.ViewModels;
using MessageBox = AdonisUI.Controls.MessageBox;
using MessageBoxImage = AdonisUI.Controls.MessageBoxImage;

namespace FModel.Views
{
    public partial class ModelViewer
    {
        private bool _messageShown;
        private ApplicationViewModel _applicationView => ApplicationService.ApplicationView;

        public ModelViewer()
        {
            DataContext = _applicationView;
            InitializeComponent();
        }

        public async void Load(UObject export) => await _applicationView.ModelViewer.LoadExport(export);
        public async void Swap(UMaterialInstance materialInstance)
        {
            var sucess = await _applicationView.ModelViewer.TryChangeSelectedMaterial(materialInstance);
            if (sucess)
            {
                _applicationView.CUE4Parse.ModelIsSwappingMaterial = false;
            }
            else
            {
                MessageBox.Show(new MessageBoxModel
                {
                    Text = "An attempt to load a material failed.",
                    Caption = "Error",
                    Icon = MessageBoxImage.Error,
                    Buttons = MessageBoxButtons.OkCancel(),
                    IsSoundEnabled = false
                });
            }
        }

        private void OnClosing(object sender, CancelEventArgs e)
        {
            _applicationView.ModelViewer.Clear();
            _applicationView.ModelViewer.AppendMode = false;
            _applicationView.CUE4Parse.ModelIsSwappingMaterial = false;
            MyAntiCrashGroup.ItemsSource = null; // <3
        }

        private void OnWindowKeyDown(object sender, KeyEventArgs e)
        {
            switch (e.Key)
            {
                case Key.W:
                    _applicationView.ModelViewer.WirefreameToggle();
                    break;
                case Key.H:
                    _applicationView.ModelViewer.RenderingToggle();
                    break;
                case Key.D:
                    _applicationView.ModelViewer.DiffuseOnlyToggle();
                    break;
            }
        }

        private void OnFocusClick(object sender, RoutedEventArgs e)
            => _applicationView.ModelViewer.FocusOnSelectedMesh();

        private void OnCopyClick(object sender, RoutedEventArgs e)
            => _applicationView.ModelViewer.CopySelectedMaterialName();

        private void Save(object sender, RoutedEventArgs e)
            => _applicationView.ModelViewer.SaveLoadedModels();

        private void OnChangeMaterialClick(object sender, RoutedEventArgs e)
        {
            _applicationView.CUE4Parse.ModelIsSwappingMaterial = true;

            if (!_messageShown)
            {
                MessageBox.Show(new MessageBoxModel
                {
                    Text = "Simply extract a material once FModel will be brought to the foreground. This message will be shown once per Model Viewer's lifetime, close it to begin.",
                    Caption = "How To Change Material?",
                    Icon = MessageBoxImage.Information,
                    IsSoundEnabled = false
                });
                _messageShown = true;
            }

            MainWindow.YesWeCats.Activate();
        }
    }
}