SystemTrayMenu/UserInterface/FolderBrowseDialog/FolderDialog.cs

// <copyright file="FolderDialog.cs" company="PlaceholderCompany">
// Copyright (c) PlaceholderCompany. All rights reserved.
// </copyright>

namespace SystemTrayMenu.UserInterface.FolderBrowseDialog
{
    using System;
    using System.IO;
    using System.Runtime.InteropServices;
    using System.Windows.Forms;
    using SystemTrayMenu.Utilities;

    public class FolderDialog : IFolderDialog, IDisposable
    {
        private bool isDisposed;

        ~FolderDialog() // the finalizer
        {
            Dispose(false);
        }

        /// <summary>
        /// Gets or sets /sets folder in which dialog will be open.
        /// </summary>
        public string InitialFolder { get; set; }

        /// <summary>
        /// Gets or sets /sets directory in which dialog will be open
        /// if there is no recent directory available.
        /// </summary>
        public string DefaultFolder { get; set; }

        /// <summary>
        /// Gets or sets selected folder.
        /// </summary>
        public string Folder { get; set; }

        public DialogResult ShowDialog()
        {
            return ShowDialog(owner: new WindowWrapper(IntPtr.Zero));
        }

        public DialogResult ShowDialog(IWin32Window owner)
        {
            if (Environment.OSVersion.Version.Major >= 6)
            {
                return ShowVistaDialog(owner);
            }
            else
            {
                return ShowLegacyDialog(owner);
            }
        }

        public DialogResult ShowVistaDialog(IWin32Window owner)
        {
            NativeMethods.IFileDialog frm = (NativeMethods.IFileDialog)new NativeMethods.FileOpenDialogRCW();
            frm.GetOptions(out uint options);
            options |= NativeMethods.FOS_PICKFOLDERS |
                       NativeMethods.FOS_FORCEFILESYSTEM |
                       NativeMethods.FOS_NOVALIDATE |
                       NativeMethods.FOS_NOTESTFILECREATE |
                       NativeMethods.FOS_DONTADDTORECENT;
            frm.SetOptions(options);
            if (InitialFolder != null)
            {
                Guid riid = new("43826D1E-E718-42EE-BC55-A1E261C37BFE"); // IShellItem
                if (NativeMethods.SHCreateItemFromParsingName(
                    InitialFolder,
                    IntPtr.Zero,
                    ref riid,
                    out NativeMethods.IShellItem directoryShellItem) == NativeMethods.S_OK)
                {
                    frm.SetFolder(directoryShellItem);
                }
            }

            if (DefaultFolder != null)
            {
                Guid riid = new("43826D1E-E718-42EE-BC55-A1E261C37BFE"); // IShellItem
                if (NativeMethods.SHCreateItemFromParsingName(
                    DefaultFolder,
                    IntPtr.Zero,
                    ref riid,
                    out NativeMethods.IShellItem directoryShellItem) == NativeMethods.S_OK)
                {
                    frm.SetDefaultFolder(directoryShellItem);
                }
            }

            if (owner != null && frm.Show(owner.Handle) == NativeMethods.S_OK)
            {
                try
                {
                    if (frm.GetResult(out NativeMethods.IShellItem shellItem) == NativeMethods.S_OK)
                    {
                        if (shellItem.GetDisplayName(
                            NativeMethods.SIGDN_FILESYSPATH,
                            out IntPtr pszString) == NativeMethods.S_OK)
                        {
                            if (pszString != IntPtr.Zero)
                            {
                                try
                                {
                                    Folder = Marshal.PtrToStringAuto(pszString);
                                    return DialogResult.OK;
                                }
                                finally
                                {
                                    Marshal.FreeCoTaskMem(pszString);
                                }
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    Log.Warn("Folder Dialog failed", ex);
                }
            }

            return DialogResult.Cancel;
        }

        public DialogResult ShowLegacyDialog(IWin32Window owner)
        {
            using SaveFileDialog frm = new()
            {
                CheckFileExists = false,
                CheckPathExists = true,
                CreatePrompt = false,
                Filter = "|" + Guid.Empty.ToString(),
                FileName = "any",
            };
            if (InitialFolder != null)
            {
                frm.InitialDirectory = InitialFolder;
            }

            frm.OverwritePrompt = false;
            frm.Title = Translator.GetText("Select directory");
            frm.ValidateNames = false;
            if (frm.ShowDialog(owner) == DialogResult.OK)
            {
                Folder = Path.GetDirectoryName(frm.FileName);
                return DialogResult.OK;
            }
            else
            {
                return DialogResult.Cancel;
            }
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!isDisposed)
            {
            }

            isDisposed = true;
        }
    }
}