ExcelHelper/Views/Pages/ImportExcelPage.xaml.cs

using System.Windows.Controls;
using CommunityToolkit.Mvvm.Messaging;
using ExcelHelper.Message;
using ExcelHelper.Views.ViewModels;

namespace ExcelHelper.Views.Pages
{
    /// <summary>
    /// ImportExcelPage.xaml 的交互逻辑
    /// </summary>
    public partial class ImportExcelPage : Page, IView, IRecipient<UpdateDataGridColumnsMessage>
    {
        private ImportViewModel ViewModel;
        public ImportExcelPage(ImportViewModel viewModel)
        {
            InitializeComponent();
            this.DataContext = ViewModel = viewModel;
            //GenerateDataGridColumns();
            //Messenger
            ViewModel.IsActive = true;
            // Register a message in some module
            WeakReferenceMessenger.Default.Register<UpdateDataGridColumnsMessage>(this, (r, message) =>
            {
                if (message.Value != null)
                {
                    ExcelDataPreviewGrid.Columns.Clear();
                    foreach (var column in message.Value)
                    {
                        ExcelDataPreviewGrid.Columns.Add(column);
                    }
                }
            });
        }
        private void Grid_DragEnter(object sender, System.Windows.DragEventArgs e)
        {
            if (e.Data.GetDataPresent(System.Windows.DataFormats.FileDrop))
            {
                e.Effects = System.Windows.DragDropEffects.Link;
            }
            else
            {
                e.Effects = System.Windows.DragDropEffects.None;
            }
            DropFileMask.Visibility = System.Windows.Visibility.Visible;
        }

        private void Grid_Drop(object sender, System.Windows.DragEventArgs e)
        {
            DropFileMask.Visibility = System.Windows.Visibility.Collapsed;
            if (e.Data.GetDataPresent(System.Windows.DataFormats.FileDrop))
            {
                var files = (string[])e.Data.GetData(System.Windows.DataFormats.FileDrop);
                if (files.Length > 0)
                {
                    //ViewModel.FileDropCommand.CanExecute(files);
                    ViewModel.FileDrop(files);
                }
            }
        }

        private void Grid_DragLeave(object sender, System.Windows.DragEventArgs e)
        {
            DropFileMask.Visibility = System.Windows.Visibility.Collapsed;
        }

        void IRecipient<UpdateDataGridColumnsMessage>.Receive(UpdateDataGridColumnsMessage message)
        {
            if (message.Value != null)
            {
                ExcelDataPreviewGrid.Columns.Clear();
                foreach (var column in message.Value)
                {
                    ExcelDataPreviewGrid.Columns.Add(column);
                }
            }
        }

    }
}