PixiEditor/PixiEditor/ViewModels/SaveFilePopupViewModel.cs

using Microsoft.Win32;
using PixiEditor.Helpers;
using PixiEditor.Models.IO;
using System;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Windows;

namespace PixiEditor.ViewModels
{
    internal class SaveFilePopupViewModel : ViewModelBase
    {
        private string _filePath;
        private ImageFormat _chosenFormat;

        public SaveFilePopupViewModel()
        {
            CloseButtonCommand = new RelayCommand(CloseWindow);
            DragMoveCommand = new RelayCommand(MoveWindow);
            OkCommand = new RelayCommand(OkButton);
        }

        public RelayCommand CloseButtonCommand { get; set; }
        public RelayCommand DragMoveCommand { get; set; }
        public RelayCommand OkCommand { get; set; }

        public string FilePath
        {
            get => _filePath;
            set
            {
                if (_filePath != value)
                {
                    _filePath = value;
                    RaisePropertyChanged(nameof(FilePath));
                }
            }
        }

        public ImageFormat ChosenFormat 
        { 
            get => _chosenFormat;
            set
            {
                if (_chosenFormat != value)
                {
                    _chosenFormat = value;
                    RaisePropertyChanged(nameof(ChosenFormat));
                }
            }
        }
                
        /// <summary>
        ///     Command that handles Path choosing to save file
        /// </summary>
        private string ChoosePath()
        {
            SaveFileDialog path = new SaveFileDialog
            {
                Title = "Export path",
                CheckPathExists = true,
                DefaultExt = "." + Exporter.Formats.First().ToString().ToLower(),
                Filter = Exporter.BuildFilter()
            };
            if (path.ShowDialog() == true)
            {
                if (string.IsNullOrEmpty(path.FileName) == false)
                {
                    ChosenFormat = Exporter.ParseImageFormat(Path.GetExtension(path.SafeFileName));
                    return path.FileName;
                }
            }
            return null;
        }

        private void CloseWindow(object parameter)
        {
            ((Window)parameter).DialogResult = false;
            CloseButton(parameter);
        }

        private void MoveWindow(object parameter)
        {
            DragMove(parameter);
        }

        private void OkButton(object parameter)
        {
            string path = ChoosePath();
            if (path == null)
                return;
            FilePath = path;
            
            ((Window)parameter).DialogResult = true;
            CloseButton(parameter);
        }
    }
}