kmpdfkit_demo/Demo/Examples/Compdfkit_Tools/Security/Encryption/FileGridListControl.xaml.cs

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using Microsoft.Win32;

namespace Compdfkit_Tools.PDFControl
{
    public partial class FileGridListControl : UserControl, INotifyPropertyChanged
    {
        public static readonly DependencyProperty IsEnsureProperty =
            DependencyProperty.Register(nameof(IsEnsure), typeof(bool), typeof(FileGridListControl), new PropertyMetadata(false));
        public bool IsEnsure
        {
            get => (bool)GetValue(IsEnsureProperty);
            private set
            {
                SetValue(IsEnsureProperty, value);
            }
        }
        
        public class FileInfoData
        {
            public string FileName { get; set; }
            public string Size { get; set; }
            public string Location { get; set; }
        };

        private int _fileNumText;
        public int FileNumText
        {
            get => _fileNumText;
            set
            {
                if(UpdateProper(ref _fileNumText, value))
                    IsEnsure = _fileNumText > 0;
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        public event EventHandler FileNumChanged;
        
        ObservableCollection<FileInfoData> _fileInfoDataList;

        public ObservableCollection<FileInfoData> FileInfoDataList
        {
            get
            {
                return _fileInfoDataList;
            }
            set
            {
                _fileInfoDataList = value;
                _fileInfoDataList.CollectionChanged += (sender, args) =>
                {
                    FileNumText = _fileInfoDataList.Count;
                };
            }
        }


        public FileGridListControl()
        {
            InitializeComponent();
            FileInfoDataList = new ObservableCollection<FileInfoData>();
            DataContext = this;
            FileDataGrid.ItemsSource = FileInfoDataList;
            FileInfoDataList.Clear();
        }
        
        private void AddFiles_Click(object sender, RoutedEventArgs e)
        {
            var dialog = new OpenFileDialog();
            dialog.Multiselect = true;
            dialog.Filter = @"PDF Files (*.pdf)|*.pdf";
            dialog.ShowDialog();
            dialog.Multiselect = true;

            foreach (var fileName in dialog.FileNames)
            {
                var file = new FileInfo(fileName);
                var fileInfoData = new FileInfoData()
                {
                    FileName = file.Name,
                    Size = GetSizeFromBytes(file.Length),
                    Location = file.FullName
                };
                
                if (FileInfoDataList.All(item => item.Location != fileInfoData.Location))
                {
                    FileInfoDataList.Add(fileInfoData);
                }
            }
        }

        
        private string GetSizeFromBytes(long bytes)
        {
            string[] sizes = { "B", "KB", "MB", "GB", "TB" };
            double len = bytes;
            int order = 0;
            while (len >= 1024 && order < sizes.Length - 1)
            {
                order++;
                len /= 1024;
            }
            return $"{len:0.##} {sizes[order]}";
        }

        private void Remove_Click(object sender, RoutedEventArgs e)
        {
            if (FileDataGrid.SelectedItems.Count == 0)
            {
                FileInfoDataList.Clear();
                OnPropertyChanged("FileNum");
                return;
            }
            var selectedItems = FileDataGrid.SelectedItems;
            var selectedItemsList = selectedItems.Cast<FileInfoData>().ToList();
            
            foreach (var item in selectedItemsList)
            {
                FileInfoDataList.Remove(item);
            }
            OnPropertyChanged("FileNum");
        }
        
        protected virtual void OnPropertyChanged(string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
        
        protected bool UpdateProper<T>(ref T properValue,
            T newValue,
            [CallerMemberName] string properName = "")
        {
            if (object.Equals(properValue, newValue))
                return false;

            properValue = newValue;
            OnPropertyChanged(properName);
            return true;
        }

        private void FileDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            BtnRemove.Content = FileDataGrid.SelectedItems.Count > 0 ? "Remove" : "Remove All";
        }

        private void FileDataGrid_OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (e.OriginalSource.GetType() != typeof(DataGridCell))
            {
                FileDataGrid.UnselectAll();
            }
        }
    }
}