C#のWinFormsでファイルマネージャーのような物をつくる。2「コピー他」

namespace FileManagerControl;

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        var fm = new FileManager
        {
            CurrentDirectory = @"H:\text",
            Dock = DockStyle.Fill,
        };
        fm.FileSelected += (s, e) =>
        {
            var ee = (FileManagerEventArgs)e;
            MessageBox.Show(ee.FullPath,"ファイルが選択されたよ。");
        };
        var cms = new ContextMenuStrip();
        var pathViewMenuItem = new ToolStripMenuItem{ Text = "パスを表示", Visible = true };
        var deleteMenuItem = new ToolStripMenuItem{ Text = "削除", Visible = true };
        var copyMenuItem = new ToolStripMenuItem{ Text = "コピー", Visible = true };
        var cutMenuItem = new ToolStripMenuItem{ Text = "切り取り", Visible = true };
        var cancelMenuItem = new ToolStripMenuItem{ Text = "キャンセル", Visible = false };
        var pasteMenuItem = new ToolStripMenuItem{ Text = "貼り付け", Visible = false };
        
        cms.Items.AddRange(new ToolStripMenuItem[]{
            pathViewMenuItem,
            deleteMenuItem,
            copyMenuItem,
            cutMenuItem,
            cancelMenuItem,
            pasteMenuItem});
        fm.ContextMenuStrip = cms;

        // パスの表示
        var pathViewAction = new Action(() => {
            string text = "";

            foreach(var t in fm.GetSlectedPath())
            {
                text = text + t + "\n";
            }

            MessageBox.Show(text, "パスの表示");

        });
        pathViewMenuItem.Click += (s, e) => pathViewAction();
        // 削除
        var deleteAction = new Action(async () => {

            var files = new List<string>(fm.GetSlectedPath());
            if (!files.Any()) return;

            var r = MessageBox.Show(files[0], "削除しますか？", MessageBoxButtons.YesNo, MessageBoxIcon.Hand);

            if (r != DialogResult.Yes) return;

            var result = await Task.Run(()=>{
                int count = 0;
                foreach(var path in files)
                {
                    if (File.Exists(path))
                    {
                        File.Delete(path);
                        count++;
                    }
                }
                return count;
            });
            fm.Reload();
        });
        deleteMenuItem.Click += (s, e) => deleteAction();

        // コピー
        List<string> copyItems = new();
        var copyAction = new Action(()=>{
            // 選択項目を配列にセット
            foreach(var t in fm.GetSlectedPath())
            {
                copyItems.Add(t);
            }
            if (copyItems.Any())
            {
                copyMenuItem.Visible = false;
                cutMenuItem.Visible = false;
                cancelMenuItem.Visible = true;
                pasteMenuItem.Visible = true;
            }
        });
        copyMenuItem.Click += (s, e) => copyAction();

        // 切り取り
        List<string> cutItems = new();
        var cutAction = new Action(()=>{
            // 選択項目を配列にセット
            foreach(var t in fm.GetSlectedPath())
            {
                cutItems.Add(t);
            }
            if (cutItems.Any())
            {
                copyMenuItem.Visible = false;
                cutMenuItem.Visible = false;
                cancelMenuItem.Visible = true;
                pasteMenuItem.Visible = true;
            }
        });
        cutMenuItem.Click += (s, e) => cutAction();
        // キャンセル
        var cancelAction = new Action(()=>{
            copyItems.Clear();
            cutItems.Clear();
            copyMenuItem.Visible = true;
            cutMenuItem.Visible = true;
            cancelMenuItem.Visible = false;
            pasteMenuItem.Visible = false;
        });
        cancelMenuItem.Click += (s, e) => cancelAction();
        // 貼り付け
        var pasteAction = new Action(async ()=>{

            string dstDir = fm.CurrentDirectory;

            var result = await Task.Run(() => {
                int count = 0;
                // コピー
                foreach(var srcPath in copyItems)
                {
                    var dstPath = Path.Join(dstDir, Path.GetFileName(srcPath));
                    if (File.Exists(srcPath) && !File.Exists(dstPath))
                    {
                        // ディレクトリの場合どうしよう？
                        File.Copy(srcPath, dstPath);
                        count++;
                    };
                }
                // 切り取り
                foreach(var srcPath in cutItems)
                {
                    var dstPath = Path.Join(dstDir, Path.GetFileName(srcPath));
                    if (File.Exists(srcPath) && !File.Exists(dstPath))
                    {
                        File.Move(srcPath, dstPath);
                        count++;
                    }
                }
                return count;
            });

            System.Diagnostics.Debug.Print("{0}", result);
            cancelAction();
            
            // 再読み込み
            fm.Reload();
        });
        pasteMenuItem.Click += (s, e) => pasteAction();

        // キーイベント
        this.KeyPreview = true;
        this.KeyDown += (s, e) => {
             if (e.KeyData == (Keys.Control | Keys.C)) {
                copyAction();
             } else if (e.KeyData == (Keys.Control | Keys.X)){
                cutAction();
             } else if (e.KeyData == (Keys.Control | Keys.V)){
                pasteAction();
             } else if (e.KeyData == Keys.Delete){
                deleteAction();
             } else if (e.KeyData == Keys.Escape){
                cancelAction();
             }
        };

        // コントロールを追加
        Controls.Add(fm);
    }
}