VideoConcat/Models/VideoModel.cs

using Standard;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using System.Xml.Linq;
using static System.Windows.Forms.VisualStyles.VisualStyleElement.Header;

namespace VideoConcat.Models
{
    public class VideoModel : INotifyPropertyChanged
    {
        private int _num;
        private string _folderPath = "";
        private bool _canStart = false;
        private ObservableCollection<FolderInfo> _FolderInfos = [];

        public int Num
        {
            get { return _num; }
            set
            {
                _num = value;
                OnPropertyChanged();
            }
        }

        public struct FolderInfo
        {
            public DirectoryInfo DirectoryInfo{set;get;}
            public int Num { set; get; }
        }

        public ObservableCollection<FolderInfo> FolderInfos
        {
            get { return _FolderInfos; }
            set
            {
                if (_FolderInfos != null)
                {
                    _FolderInfos.CollectionChanged -= ItemList_CollectionChanged;
                }
                _FolderInfos = value;
                if (_FolderInfos != null)
                {
                    _FolderInfos.CollectionChanged += ItemList_CollectionChanged;
                }
                OnPropertyChanged();
                UpdateSum();
            }
        }

        public string FolderPath
        {
            get { return _folderPath; }
            set
            {
                _folderPath = value;
                OnPropertyChanged(nameof(FolderPath));
            }
        }

        public bool CanStart
        {
            get { return _canStart; }
            set
            {
                _canStart = value;
                OnPropertyChanged(nameof(CanStart));
            }
        }

        public ICommand? BtnOpenFolderCommand { get; set; }
        public ICommand? BtnStartVideoConcatCommand { get; set; }

        public event PropertyChangedEventHandler? PropertyChanged;


        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        private void ItemList_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
        {
            UpdateSum();
        }

        public void UpdateSum()
        {
            int _temp = 1;
            foreach (var item in FolderInfos)
            {
                if (item.Num > 0)
                {
                    _temp *= item.Num;
                }
            }
            Num = _temp;
            if(Num > 0){
                CanStart = true;
            }
        }
    }
}