winscp/source/packages/filemng/DirView.pas

unit DirView;
{===============================================================
 Component TDirView / Version 2.6, January 2000
 ===============================================================


    Description:
    ============
    Displays files of a single directory as listview with shell
    icons. Complete drag&Drop support for files and directories.


    Author:
    =======
    (c) Ingo Eckel 1998, 1999
    Sodener Weg 38
    65812 Bad Soden
    Germany

    Modifications (for WinSCP):
    ===========================
    (c) Martin Prikryl 2001- 2004

    V2.6:
    - Shows "shared"-symbol with directories
    - Delphi5 compatible

    For detailed documentation and history see TDirView.htm.

 ===============================================================}

{Required compiler options for TDirView:}
{$A+,B-,X+,H+,P+}

interface

{$WARN UNIT_PLATFORM OFF}
{$WARN SYMBOL_PLATFORM OFF}

uses
  Windows, ShlObj, ComCtrls, CompThread, CustomDirView,
  ExtCtrls, Graphics, FileOperator, DiscMon, Classes, DirViewColProperties,
  DragDrop, Messages, ListViewColProperties, CommCtrl, DragDropFilesEx,
  FileCtrl, SysUtils, BaseUtils, Controls, CustomDriveView, System.Generics.Collections, Winapi.ShellAPI;

type
  TVolumeDisplayStyle = (doPrettyName, doDisplayName); {Diplaytext of drive node}

const
  msThreadChangeDelay = 10; {TDiscMonitor: change delay}
  MaxWaitTimeOut = 10; {TFileDeleteThread: wait nn seconds for deleting files or directories}
{$WARN SYMBOL_DEPRECATED OFF}
  FileAttr = SysUtils.faAnyFile and (not SysUtils.faVolumeID);
{$WARN SYMBOL_DEPRECATED ON}
  SpecialExtensions = 'EXE,LNK,ICO,ANI,CUR,PIF,JOB,CPL';
  ExeExtension = 'EXE';

type
  {Exceptions:}
  EDragDrop = class(Exception);

  TClipboardOperation = (cboNone, cboCut, cboCopy);

  {Record for each file item:}
  PFileRec = ^TFileRec;
  TFileRec = record
    Empty: Boolean;
    IconEmpty: Boolean;
    IsDirectory: Boolean;
    IsRecycleBin: Boolean;
    IsParentDir: Boolean;
    FileName: string;
    Displayname: string;
    FileExt: string;
    TypeName: string;
    ImageIndex: Integer;
    Thumbnail: TBitmap;
    ThumbnailSize: TSize;
    Size: Int64;
    Attr: LongWord;
    FileTime: TFileTime;
    PIDL: PItemIDList; {Fully qualified PIDL}
    CalculatedSize: Int64;
  end;

{Additional events:}
type
  TDirViewFileSizeChanged = procedure(Sender: TObject; Item: TListItem) of object;
  TDirViewFileIconForName = procedure(Sender: TObject; var FileName: string) of object;

type
  TDirView = class;

  {  TIconUpdateThread (Fetch shell icons via thread) }
  TIconUpdateThread = class(TCompThread)
  private
    FOwner: TDirView;
    FSyncIcon: Integer;
    FSyncThumbnail: TBitmap;
    FCurrentIndex: Integer;
    FCurrentFilePath: string;
    FCurrentItemData: TFileRec;

  protected
    constructor Create(Owner: TDirView);
    procedure Execute; override;

  public
    destructor Destroy; override;
  end;

  // WORKAROUND: TQueue<Integer>.Create fails when TDirView is created in IDE, while TQueue<TIconUpdateSchedule>.Create works
  TIconUpdateSchedule = record
    Index: Integer;
  end;

  { TDirView }
  TDirView = class(TCustomDirView)
  private
    FConfirmDelete: Boolean;
    FConfirmOverwrite: Boolean;
    FDriveView: TCustomDriveView;
    FChangeTimer: TTimer;
    FChangeInterval: Cardinal;
    FUseIconUpdateThread: Boolean;
    FDriveType: Integer;
    FParentFolder: IShellFolder;
    FDesktopFolder: IShellFolder;
    FDirOK: Boolean;
    FPath: string;
    SelectNewFiles: Boolean;
    FHiddenCount: Integer;
    FFilteredCount: Integer;
    FNotRelative: Boolean;

    {shFileOperation-shell component TFileOperator:}
    FFileOperator: TFileOperator;
    {Additional thread components:}
    FIconUpdateThread: TIconUpdateThread;
    // only ever accessed by GUI thread
    FIconUpdateSet: TDictionary<Integer, Boolean>;
    FIconUpdateQueue: TQueue<TIconUpdateSchedule>;
    FIconUpdateQueueDeferred: TQueue<TIconUpdateSchedule>;
    FDiscMonitor: TDiscMonitor;
    FHomeDirectory: string;

    {Additional events:}
    FOnFileIconForName: TDirViewFileIconForName;

    iRecycleFolder: iShellFolder;
    PIDLRecycle: PItemIDList;

    FLastPath: TDictionary<string, string>;
    FTimeoutShellIconRetrieval: Boolean;

    {Drag&Drop:}
    function GetDirColProperties: TDirViewColProperties;
    function GetHomeDirectory: string;

    {Drag&drop helper functions:}
    procedure SignalFileDelete(Sender: TObject; Files: TStringList);
    procedure PerformDragDropFileOperation(TargetPath: string; Effect: Integer;
      RenameOnCollision: Boolean; Paste: Boolean);
    procedure SetDirColProperties(Value: TDirViewColProperties);

  protected
    function NewColProperties: TCustomListViewColProperties; override;
    function SortAscendingByDefault(Index: Integer): Boolean; override;
    procedure Notification(AComponent: TComponent; Operation: TOperation); override;

    procedure Delete(Item: TListItem); override;
    procedure DDError(ErrorNo: TDDError);
    function GetCanUndoCopyMove: Boolean; virtual;
    {Shell namespace functions:}
    function GetShellFolder(Dir: string): iShellFolder;
    function GetDirOK: Boolean; override;
    procedure GetDisplayInfo(ListItem: TListItem; var DispInfo: TLVItem); override;

    procedure DDDragDetect(grfKeyState: Longint; DetectStart, Point: TPoint;
      DragStatus: TDragDetectStatus); override;
    procedure DDMenuPopup(Sender: TObject; AMenu: HMenu; DataObj: IDataObject;
      AMinCustCmd:integer; grfKeyState: Longint; pt: TPoint); override;
    procedure DDMenuDone(Sender: TObject; AMenu: HMenu); override;
    procedure DDDropHandlerSucceeded(Sender: TObject; grfKeyState: Longint;
      Point: TPoint; dwEffect: Longint); override;
    procedure DDChooseEffect(grfKeyState: Integer; var dwEffect: Integer; PreferredEffect: Integer); override;

    function GetPathName: string; override;
    procedure SetChangeInterval(Value: Cardinal); virtual;
    procedure LoadFromRecycleBin(Dir: string); virtual;
    procedure SetLoadEnabled(Value: Boolean); override;
    function GetPath: string; override;
    procedure SetPath(Value: string); override;
    procedure PathChanged; override;
    procedure SetItemImageIndex(Item: TListItem; Index: Integer); override;
    procedure ChangeDetected(Sender: TObject; const Directory: string;
      var SubdirsChanged: Boolean);
    procedure ChangeInvalid(Sender: TObject; const Directory: string; const ErrorStr: string);
    procedure TimerOnTimer(Sender: TObject);
    procedure ResetItemImage(Index: Integer);
    procedure SetWatchForChanges(Value: Boolean); override;
    procedure AddParentDirItem;
    procedure AddToDragFileList(FileList: TFileList; Item: TListItem); override;
    function DragCompleteFileList: Boolean; override;
    procedure ExecuteFile(Item: TListItem); override;
    function GetIsRoot: Boolean; override;
    procedure InternalEdit(const HItem: TLVItem); override;
    function ItemColor(Item: TListItem): TColor; override;
    function ItemThumbnail(Item: TListItem; Size: TSize): TBitmap; override;
    function ItemFileExt(Item: TListItem): string;
    function ItemFileNameOnly(Item: TListItem): string;
    function ItemImageIndex(Item: TListItem; Cache: Boolean): Integer; override;
    function ItemIsFile(Item: TListItem): Boolean; override;
    function ItemIsRecycleBin(Item: TListItem): Boolean; override;
    function ItemMatchesFilter(Item: TListItem; const Filter: TFileFilter): Boolean; override;
    function FileMatches(FileName: string; const SearchRec: TSearchRec): Boolean;
    function ItemOverlayIndexes(Item: TListItem): Word; override;
    procedure LoadFiles; override;
    procedure PerformItemDragDropOperation(Item: TListItem; Effect: Integer; Paste: Boolean); override;
    procedure SortItems; override;
    function ThumbnailNeeded(ItemData: PFileRec): Boolean;
    procedure DoFetchIconUpdate;
    procedure DoUpdateIcon;
    procedure StartFileDeleteThread;
    procedure IconUpdateEnqueue(ListItem: TListItem);
    function IconUpdatePeek: Integer;
    procedure IconUpdateDequeue;
    procedure WMDestroy(var Msg: TWMDestroy); message WM_DESTROY;
    procedure Load(DoFocusSomething: Boolean); override;
    procedure DoFetchIcon(
      FilePath: string; IsSpecialExt: Boolean; CanTimeout: Boolean; FileRec: PFileRec; var ImageIndex: Integer; var TypeName: string);
    function GetFileInfo(
      CanUsePIDL: Boolean; PIDL: PItemIDList; Path: string; CanTimeout: Boolean;
      dwFileAttributes: DWORD; var psfi: TSHFileInfoW; uFlags: UINT): DWORD_PTR;
    function DoCopyToClipboard(Focused: Boolean; Cut: Boolean; Operation: TClipBoardOperation): Boolean;

    function HiddenCount: Integer; override;
    function FilteredCount: Integer; override;

  public
    {Runtime, readonly properties:}
    property DriveType: Integer read FDriveType;
    {Linked component TDriveView:}
    property DriveView: TCustomDriveView read FDriveView write FDriveView;
    { required, otherwise AV generated, when dragging columns}
    property Columns stored False;
    property ParentFolder: IShellFolder read FParentFolder;
    {Drag&Drop runtime, readonly properties:}
    property CanUndoCopyMove: Boolean read GetCanUndoCopyMove;
    property DDFileOperator: TFileOperator read FFileOperator;
    {Drag&Drop fileoperation methods:}
    function UndoCopyMove: Boolean; dynamic;
    {Clipboard fileoperation methods (requires drag&drop enabled):}
    procedure EmptyClipboard; dynamic;
    function CopyToClipBoard(Focused: Boolean): Boolean; dynamic;
    function CutToClipBoard(Focused: Boolean): Boolean; dynamic;
    function PasteFromClipBoard(TargetPath: string = ''): Boolean; override;
    function DuplicateSelectedFiles: Boolean; dynamic;
    procedure DisplayPropertiesMenu; override;
    procedure DisplayContextMenu(Where: TPoint); override;

    procedure ExecuteParentDirectory; override;
    procedure ExecuteRootDirectory; override;
    function ItemIsDirectory(Item: TListItem): Boolean; override;
    function ItemFullFileName(Item: TListItem): string; override;
    function ItemIsParentDirectory(Item: TListItem): Boolean; override;
    function ItemFileName(Item: TListItem): string; override;
    function ItemFileSize(Item: TListItem): Int64; override;
    function ItemFileTime(Item: TListItem; var Precision: TDateTimePrecision): TDateTime; override;
    procedure SetItemCalculatedSize(Item: TListItem; ASize: Int64); override;
    procedure OpenFallbackPath(Value: string);

    {Thread handling: }
    procedure StartWatchThread;
    procedure StopWatchThread;
    function WatchThreadActive: Boolean;
    procedure StartIconUpdateThread;
    procedure StopIconUpdateThread;
    procedure TerminateThreads;

    {Create a new subdirectory:}
    procedure CreateDirectory(DirName: string); override;
    {Delete all selected files:}

    {Check, if file or files still exists:}
    procedure ValidateFile(Item: TListItem); overload;
    procedure ValidateFile(FileName:TFileName); overload;
    procedure ValidateSelectedFiles; dynamic;

    {Access the internal data-structures:}
    function AddItem(SRec: SysUtils.TSearchRec): TListItem; reintroduce;
    procedure GetDisplayData(Item: TListItem; FetchIcon: Boolean);
    function GetFileRec(Index: Integer): PFileRec;

    {Populate / repopulate the filelist:}
    procedure Reload(CacheIcons : Boolean); override;
    procedure Reload2;

    function GetAttrString(Attr: Integer): string; virtual;

    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    procedure ExecuteHomeDirectory; override;
    procedure ReloadDirectory; override;
    procedure ExecuteDrive(Drive: string);
    property HomeDirectory: string read GetHomeDirectory write FHomeDirectory;
    property TimeoutShellIconRetrieval: Boolean read FTimeoutShellIconRetrieval write FTimeoutShellIconRetrieval;

  published
    property DirColProperties: TDirViewColProperties read GetDirColProperties write SetDirColProperties;
    property PathLabel;
    property OnUpdateStatusBar;

    property DimmHiddenFiles;
    property ShowHiddenFiles;
    property WantUseDragImages;
    property TargetPopupMenu;
    property AddParentDir;
    property OnSelectItem;
    property OnStartLoading;
    property OnLoaded;
    property OnDDDragEnter;
    property OnDDDragLeave;
    property OnDDDragOver;
    property OnDDDrop;
    property OnDDQueryContinueDrag;
    property OnDDGiveFeedback;
    property OnDDDragDetect;
    property OnDDCreateDragFileList;
    property OnDDEnd;
    property OnDDCreateDataObject;
    property OnDDTargetHasDropHandler;
    {Drag&Drop:}
    property DDLinkOnExeDrag default True;
    property OnDDProcessDropped;
    property OnDDError;
    property OnDDExecuted;
    property OnDDFileOperation;
    property OnDDFileOperationExecuted;

    property OnExecFile;
    property OnMatchMask;
    property OnGetOverlay;
    property OnGetItemColor;

    {Confirm deleting files}
    property ConfirmDelete: Boolean
      read FConfirmDelete write FConfirmDelete default True;
    {Confirm overwriting files}
    property ConfirmOverwrite: Boolean
      read FConfirmOverwrite write fConfirmOverwrite default True;
    {Reload the directory after only the interval:}
    property ChangeInterval: Cardinal
      read FChangeInterval write SetChangeInterval default MSecsPerSec;
    {Fetch shell icons by thread:}
    property UseIconUpdateThread: Boolean
      read FUseIconUpdateThread write FUseIconUpdateThread default False;
    {Watch current directory for filename changes (create, rename, delete files)}
    property WatchForChanges;

    {Additional events:}
    property OnFileIconForName: TDirViewFileIconForName
      read FOnFileIconForName write FOnFileIconForName;
    property UseSystemContextMenu;
    property OnContextPopup;
    property OnHistoryChange;
    property OnHistoryGo;
    property OnPathChange;
    property OnBusy;
    property OnChangeFocus;

    property ColumnClick;
    property MultiSelect;
    property ReadOnly;
    property DirViewStyle;

    // The only way to make Items stored automatically and survive handle recreation.
    // Though we should implement custom persisting to avoid publishing this
    property Items;
  end; {Type TDirView}

procedure Register;

{Returns True, if the specified extension matches one of the extensions in ExtList:}
function MatchesFileExt(Ext: string; const FileExtList: string): Boolean;

function DropLink(Item: PFDDListItem; TargetPath: string): Boolean;
function DropFiles(
  DragDropFilesEx: TCustomizableDragDropFilesEx; Effect: Integer; FileOperator: TFileOperator; TargetPath: string;
  RenameOnCollision: Boolean; IsRecycleBin: Boolean; ConfirmDelete: Boolean; ConfirmOverwrite: Boolean; Paste: Boolean;
  Sender: TObject; OnDDFileOperation: TDDFileOperationEvent;
  out SourcePath: string; out SourceIsDirectory: Boolean): Boolean;
procedure CheckCanOpenDirectory(Path: string);

var
  LastClipBoardOperation: TClipBoardOperation;

implementation

uses
  DriveView, OperationWithTimeout,
  PIDL, Forms, Dialogs,
  ComObj,
  ActiveX, ImgList,
  ShellDialogs, IEDriveInfo,
  FileChanges, Math, PasTools, StrUtils, Types, UITypes;

var
  ThumbnailNotNeeded: TSize;

var
  DaylightHack: Boolean;

procedure Register;
begin
  RegisterComponents('DriveDir', [TDirView]);
end; {Register}

function MatchesFileExt(Ext: string; const FileExtList: string): Boolean;
begin
  Result := (Length(Ext) = 3) and (Pos(Ext, FileExtList) <> 0);
end; {MatchesFileExt}

function FileTimeToDateTime(FileTime: TFileTime): TDateTime;
var
  SysTime: TSystemTime;
  UniverzalSysTime: TSystemTime;
  LocalFileTime: TFileTime;
begin
  // duplicated in Common.cpp

  // The 0xFFF... is sometime seen for invalid timestamps,
  // it would cause failure in SystemTimeToDateTime below
  if FileTime.dwLowDateTime = High(DWORD) then
  begin
    Result := MinDateTime;
  end
    else
  begin
    if not DaylightHack then
    begin
      FileTimeToSystemTime(FileTime, UniverzalSysTime);
      SystemTimeToTzSpecificLocalTime(nil, UniverzalSysTime, SysTime);
    end
      else
    begin
      FileTimeToLocalFileTime(FileTime, LocalFileTime);
      FileTimeToSystemTime(LocalFileTime, SysTime);
    end;
    Result := SystemTimeToDateTime(SysTime);
  end;
end;

function SizeFromSRec(const SRec: SysUtils.TSearchRec): Int64;
begin
  with SRec do
  begin
    // Hopefuly TSearchRec.FindData is available with all Windows versions
    {if Size >= 0 then Result := Size
      else}
{$WARNINGS OFF}
    Result := Int64(FindData.nFileSizeHigh) shl 32 + FindData.nFileSizeLow;
{$WARNINGS ON}
  end;
end;

function DropLink(Item: PFDDListItem; TargetPath: string): Boolean;
var
  Drive: string;
  SourcePath: string;
  SourceFile: string;
begin
  SourceFile := Item.Name;
  if IsRootPath(SourceFile) then
  begin
    Drive := DriveInfo.GetDriveKey(SourceFile);
    SourcePath := Copy(DriveInfo.Get(Drive).PrettyName, 4, 255) + ' (' + Drive + ')'
  end
    else
  begin
    SourcePath := ExtractFileName(SourceFile);
  end;

  Result :=
    CreateFileShortCut(SourceFile,
      IncludeTrailingBackslash(TargetPath) + ChangeFileExt(SourcePath, '.lnk'),
      ExtractFileNameOnly(SourceFile));
end;

function DropFiles(
  DragDropFilesEx: TCustomizableDragDropFilesEx; Effect: Integer; FileOperator: TFileOperator; TargetPath: string;
  RenameOnCollision: Boolean; IsRecycleBin: Boolean; ConfirmDelete: Boolean; ConfirmOverwrite: Boolean; Paste: Boolean;
  Sender: TObject; OnDDFileOperation: TDDFileOperationEvent;
  out SourcePath: string; out SourceIsDirectory: Boolean): Boolean;
var
  Index: Integer;
  DoFileOperation: Boolean;
begin
  SourcePath := '';

  {Set the source filenames:}
  for Index := 0 to DragDropFilesEx.FileList.Count - 1 do
  begin
    FileOperator.OperandFrom.Add(
      TFDDListItem(DragDropFilesEx.FileList[Index]^).Name);
    if DragDropFilesEx.FileNamesAreMapped then
      FileOperator.OperandTo.Add(IncludeTrailingPathDelimiter(TargetPath) +
        TFDDListItem(DragDropFilesEx.FileList[Index]^).MappedName);

    if SourcePath = '' then
    begin
      if DirectoryExists(TFDDListItem(DragDropFilesEx.FileList[Index]^).Name) then
      begin
        SourcePath := TFDDListItem(DragDropFilesEx.FileList[Index]^).Name;
        SourceIsDirectory := True;
      end
        else
      begin
        SourcePath := ExtractFilePath(TFDDListItem(DragDropFilesEx.FileList[Index]^).Name);
        SourceIsDirectory := False;
      end;
    end;
  end;

  FileOperator.Flags := FileOperatorDefaultFlags;
  if RenameOnCollision then
  begin
    FileOperator.Flags := FileOperator.Flags + [foRenameOnCollision];
    FileOperator.WantMappingHandle := True;
  end
    else FileOperator.WantMappingHandle := False;

  {Set the target directory or the target filenames:}
  if DragDropFilesEx.FileNamesAreMapped and (not IsRecycleBin) then
  begin
    FileOperator.Flags := FileOperator.Flags + [foMultiDestFiles];
  end
    else
  begin
    FileOperator.Flags := FileOperator.Flags - [foMultiDestFiles];
    FileOperator.OperandTo.Clear;
    FileOperator.OperandTo.Add(TargetPath);
  end;

  {if the target directory is the recycle bin, then delete the selected files:}
  if IsRecycleBin then
  begin
    FileOperator.Operation := foDelete;
  end
    else
  begin
    case Effect of
      DROPEFFECT_COPY: FileOperator.Operation := foCopy;
      DROPEFFECT_MOVE: FileOperator.Operation := foMove;
    end;
  end;

  if IsRecycleBin then
  begin
    if not ConfirmDelete then
      FileOperator.Flags := FileOperator.Flags + [foNoConfirmation];
  end
    else
  begin
    if not ConfirmOverwrite then
      FileOperator.Flags := FileOperator.Flags + [foNoConfirmation];
  end;

  DoFileOperation := True;
  if Assigned(OnDDFileOperation) then
  begin
    OnDDFileOperation(Sender, Effect, SourcePath, TargetPath, False, DoFileOperation);
  end;

  Result := DoFileOperation and (FileOperator.OperandFrom.Count > 0);
  if Result then
  begin
    FileOperator.Execute;
    if DragDropFilesEx.FileNamesAreMapped then
      FileOperator.ClearUndo;
  end;
end;

function GetShellDisplayName(
  const ShellFolder: IShellFolder; IDList: PItemIDList; Flags: DWORD; var Name: string): Boolean;
var
  Str: TStrRet;
begin
  Result := True;
  Name := '';
  if ShellFolder.GetDisplayNameOf(IDList, Flags, Str) = NOERROR then
  begin
    case Str.uType of
      STRRET_WSTR: Name := WideCharToString(Str.pOleStr);
      STRRET_OFFSET: Name := PChar(UINT(IDList) + Str.uOffset);
      STRRET_CSTR: Name := string(Str.cStr);
      else Result := False;
    end;
  end
    else Result := False;
end; {GetShellDisplayName}

procedure CheckCanOpenDirectory(Path: string);
var
  DosError: Integer;
  SRec: SysUtils.TSearchRec;
begin
  if not DirectoryExistsFix(Path) then
    raise Exception.CreateFmt(SDirNotExists, [Path]);
  DosError := SysUtils.FindFirst(ApiPath(IncludeTrailingPathDelimiter(Path) + '*.*'), FileAttr, SRec);
  if DosError = ERROR_SUCCESS then
  begin
    FindClose(SRec);
  end
    else
  begin
    // File not found is expected when accessing a root folder of an empty drive
    if DosError <> ERROR_FILE_NOT_FOUND then
    begin
      RaiseLastOSError;
    end;
  end;
end;

{ TIconUpdateThread }

constructor TIconUpdateThread.Create(Owner: TDirView);
begin
  inherited Create(True);
  FOwner := Owner;
end; {TIconUpdateThread.Create}

destructor TIconUpdateThread.Destroy;
begin
  FreeAndNil(FSyncThumbnail);
  inherited;
end;

procedure TIconUpdateThread.Execute;
var
  IsSpecialExt: Boolean;
  TypeName: string;
  PrevPIDL: PItemIDList;
begin
  CoInitialize(nil); // needed for SHGetFileInfo
  while not Terminated do
  begin
    FCurrentIndex := -1;
    Synchronize(FOwner.DoFetchIconUpdate);
    if (FCurrentIndex >= 0) and
       (not Terminated) then
    begin
      FSyncIcon := -1;
      if Assigned(FSyncThumbnail) then
        FreeAndNil(FSyncThumbnail);

      if FCurrentItemData.IconEmpty then
      begin
        PrevPIDL := FCurrentItemData.PIDL;
        try
          IsSpecialExt := MatchesFileExt(FCurrentItemData.FileExt, SpecialExtensions);
          FOwner.DoFetchIcon(FCurrentFilePath, IsSpecialExt, False, @FCurrentItemData, FSyncIcon, TypeName);
        except
          {Capture exceptions generated by the shell}
          FSyncIcon := UnknownFileIcon;
        end;
        if Assigned(FCurrentItemData.PIDL) and
           (PrevPIDL <> FCurrentItemData.PIDL) then
        begin
          FreePIDL(FCurrentItemData.PIDL);
        end;
      end;

      if FOwner.ThumbnailNeeded(@FCurrentItemData) then
      begin
        FSyncThumbnail := FOwner.GetThumbnail(FCurrentFilePath, FCurrentItemData.ThumbnailSize);
      end;

      if not Terminated then
      begin
        Synchronize(FOwner.DoUpdateIcon);
      end;
    end;
    SetLength(FCurrentFilePath, 0);
  end;
end; {TIconUpdateThread.Execute}

{ TDirView }

constructor TDirView.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);

  FDriveType := DRIVE_UNKNOWN;
  FConfirmDelete := True;
  FParentFolder := nil;
  FDesktopFolder := nil;
  SelectNewFiles := False;
  DragOnDriveIsMove := True;
  FHiddenCount := 0;
  FFilteredCount := 0;
  FNotRelative := False;

  FFileOperator := TFileOperator.Create(Self);
  FDirOK := True;
  FPath := '';

  FDiscMonitor := nil;

  {ChangeTimer: }
  if FChangeInterval = 0 then FChangeInterval := MSecsPerSec;
  FChangeTimer := TTimer.Create(Self);
  FChangeTimer.Interval := FChangeInterval;
  FChangeTimer.Enabled := False;
  FChangeTimer.OnTimer := TimerOnTimer;

  {Drag&drop:}
  FConfirmOverwrite := True;
  DDLinkOnExeDrag := True;

  with DragDropFilesEx do
  begin
    SourceEffects := DragSourceEffects;
    TargetEffects := [deCopy, deMove, deLink];

    ShellExtensions.DragDropHandler := True;
    ShellExtensions.DropHandler := True;
  end;

  FIconUpdateSet := TDictionary<Integer, Boolean>.Create;
  FIconUpdateQueue := TQueue<TIconUpdateSchedule>.Create;
  FIconUpdateQueueDeferred := TQueue<TIconUpdateSchedule>.Create;

  FLastPath := nil;
end; {Create}

destructor TDirView.Destroy;
begin
  FreeAndNil(FIconUpdateQueue);
  FreeAndNil(FIconUpdateQueueDeferred);
  FreeAndNil(FIconUpdateSet);

  if Assigned(PIDLRecycle) then FreePIDL(PIDLRecycle);

  FLastPath.Free;
  FFileOperator.Free;
  FChangeTimer.Free;

  inherited Destroy;
  FPath := '';
end; {Destroy}

procedure TDirView.WMDestroy(var Msg: TWMDestroy);
begin
  Selected := nil;
  ClearItems;
  TerminateThreads;
  inherited;
end; {WMDestroy}

procedure TDirView.TerminateThreads;
begin
  StopIconUpdateThread;
  StopWatchThread;
  if Assigned(FDiscMonitor) then
  begin
    FDiscMonitor.Free;
    FDiscMonitor := nil;
  end;
end; {TerminateThreads}

function TDirView.GetHomeDirectory: string;
begin
  if FHomeDirectory <> '' then Result := FHomeDirectory
    else
  begin
    Result := UserDocumentDirectory;
    // in rare case the CSIDL_PERSONAL cannot be resolved
    if Result = '' then
    begin
      Result := DriveInfo.AnyValidPath;
    end;
  end;
end; { GetHomeDirectory }

function TDirView.GetIsRoot: Boolean;
begin
  Result := IsRootPath(Path);
end;

function TDirView.GetPath: string;
begin
  Result := FPath;
end;

procedure TDirView.PathChanged;
var
  Expanded: string;
begin
  inherited;

  // make sure to use PathName as Path maybe just X: what
  // ExpandFileName resolves to current working directory
  // on the drive, not to root path
  Expanded := ExpandFileName(PathName);
  if not Assigned(FLastPath) then
  begin
    FLastPath := TDictionary<string, string>.Create;
  end;
  FLastPath.AddOrSetValue(DriveInfo.GetDriveKey(Expanded), Expanded);
end;

procedure TDirView.SetPath(Value: string);
var
  LongPath: string;
  Len: Integer;
begin
  // do checks before passing directory to drive view, because
  // it would truncate non-existing directory to first superior existing
  Value := ReplaceStr(Value, '/', '\');

  // Convert to long path
  Len := GetLongPathName(PChar(ApiPath(Value)), nil, 0);
  SetLength(LongPath, Len);
  Len := GetLongPathName(PChar(ApiPath(Value)), PChar(LongPath), Len);
  if Len > 0 then
    Value := Copy(LongPath, 1, Len);

  CheckCanOpenDirectory(Value);

  if Assigned(FDriveView) and
     (FDriveView.Directory <> Value) then
  begin
    FDriveView.Directory := Value;
  end
    else
  if FPath <> Value then
  try
    while ExcludeTrailingPathDelimiter(Value) <> Value do
    begin
      Value := ExcludeTrailingPathDelimiter(Value);
    end;
    PathChanging(not FNotRelative);
    FPath := Value;
    Load(True);
  finally
    PathChanged;
  end;
end;

procedure TDirView.OpenFallbackPath(Value: string);
var
  APath: string;
begin
  while True do
  begin
    APath := ExtractFileDir(Value);
    if (APath = '') or (APath = Value) then
    begin
      Break;
    end
      else
    begin
      try
        Path := APath;
        Break;
      except
        Value := APath;
      end;
    end;
  end;
end;

procedure TDirView.SetLoadEnabled(Value: Boolean);
begin
  if Value <> LoadEnabled then
  begin
    FLoadEnabled := Enabled;
    if LoadEnabled and Dirty then
    begin
      if Items.Count > 100 then Reload2
        else Reload(True);
    end;
  end;
end; {SetLoadEnabled}

function TDirView.GetPathName: string;
begin
  if IsRoot then Result := IncludeTrailingBackslash(Path)
    else Result := Path;
end; {GetPathName}

function TDirView.GetFileRec(Index: Integer): PFileRec;
begin
  if Index > Pred(Items.Count) then Result := nil
    else Result := Items[index].Data;
end; {GetFileRec}

function TDirView.HiddenCount: Integer;
begin
  Result := FHiddenCount;
end;

function TDirView.FilteredCount: Integer;
begin
  Result := FFilteredCount;
end;

function TDirView.AddItem(SRec: SysUtils.TSearchRec): TListItem;
var
  PItem: PFileRec;
  Item: TListItem;
begin
  Item := TListItem.Create(Items);
  New(PItem);
  with PItem^ do
  begin
    // must be set as soon as possible, at least before Caption is set,
    // because if come column is "autosized" setting Caption invokes some callbacks
    Item.Data := PItem;

    FileName := SRec.Name;
    FileExt := UpperCase(ExtractFileExt(Srec.Name));
    FileExt := Copy(FileExt, 2, Length(FileExt) - 1);
    DisplayName := FileName;
{$WARNINGS OFF}
    Attr := SRec.FindData.dwFileAttributes;
{$WARNINGS ON}
    IsParentDir := False;
    IsDirectory := ((Attr and SysUtils.faDirectory) <> 0);
    IsRecycleBin := IsDirectory and (Length(Path) = 2) and
      Bool(Attr and SysUtils.faSysFile) and
      ((UpperCase(FileName) = 'RECYCLED') or (UpperCase(FileName) = 'RECYCLER'));
    if not IsDirectory then Size := SizeFromSRec(SRec)
      else Size := -1;

{$WARNINGS OFF}
    FileTime := SRec.FindData.ftLastWriteTime;
{$WARNINGS ON}
    Empty := True;
    IconEmpty := True;
    Thumbnail := nil;
    ThumbnailSize := ThumbnailNotNeeded;
    if Size > 0 then Inc(FFilesSize, Size);
    PIDL := nil;
    CalculatedSize := -1;

    // Need to add before assigning to .Caption and .OverlayIndex,
    // as the setters these call back to owning view.
    // Assignment is redundant
    Item := Items.AddItem(Item);

    if not Self.IsRecycleBin then Item.Caption := SRec.Name;
    if FileExt = 'LNK' then Item.OverlayIndex := 1;
  end;
  if SelectNewFiles then Item.Selected := True;

  Result := Item;
end; {AddItem}

procedure TDirView.AddParentDirItem;
var
  PItem: PFileRec;
  Item: TListItem;
  SRec: SysUtils.TSearchRec;
begin
  FHasParentDir := True;
  Item := Items.Add;
  New(PItem);
  if FindFirst(ApiPath(FPath), faAnyFile, SRec) = 0 then
    FindClose(SRec);
  with PItem^ do
  begin
    Item.Data := PItem;
    FileName := '..';
    FileExt := '';
    DisplayName := '..';
    Attr := SRec.Attr;
    IsDirectory := True;
    IsRecycleBin := False;
    IsParentDir := True;
    Size := -1;
    CalculatedSize := -1;

    Item.Caption := '..';

{$WARNINGS OFF}
    FileTime := SRec.FindData.ftLastWriteTime;
{$WARNINGS ON}
    Empty := True;
    IconEmpty := False;
    Thumbnail := nil;
    ThumbnailSize := ThumbnailNotNeeded;
    PIDL := nil;

    ImageIndex := StdDirIcon;

    TypeName := SParentDir;
    Empty := False;
  end;
end; {AddParentDirItem}

procedure TDirView.LoadFromRecycleBin(Dir: string);
var
  PIDLRecycleLocal: PItemIDList;
  PCurrList: PItemIDList;
  FQPIDL: PItemIDList;
  EnumList: IEnumIDList;
  Fetched: ULONG;
  SRec: SysUtils.TSearchRec;
  DisplayName: string;
  FullPath: string;
  NewItem: TListItem;
  FileRec: PFileRec;
  FileInfo: TSHFileInfo;
  DosError: Integer;

begin
  if not Assigned(iRecycleFolder) then
  begin
    PIDLRecycleLocal := nil;
    try
      OLECheck(SHGetSpecialFolderLocation(Self.Handle,
        CSIDL_BITBUCKET, PIDLRecycleLocal));
      PIDLRecycle := PIDL_Concatenate(nil, PIDLRecycleLocal);

      if not SUCCEEDED(FDesktopFolder.BindToObject(PIDLRecycle, nil,
        IID_IShellFolder, Pointer(iRecycleFolder))) then Exit;
    finally
      if Assigned(PIDLRecycleLocal) then
        FreePIDL(PIDLRecycleLocal);
    end;
  end;
  FParentFolder := iRecycleFolder;

  if AddParentDir then AddParentDirItem;

  FHiddenCount := 0;
  FFilteredCount := 0;

  if SUCCEEDED(iRecycleFolder.EnumObjects(Self.Handle,
    SHCONTF_FOLDERS or SHCONTF_NONFOLDERS or SHCONTF_INCLUDEHIDDEN, EnumList)) then
  begin
     while (EnumList.Next(1, PCurrList, Fetched) = S_OK) and not AbortLoading do
     begin
       if Assigned(PCurrList) then
       try
         FQPIDL := PIDL_Concatenate(PIDLRecycle, PCurrList);

         {Physical filename:}
         SetLength(FullPath, MAX_PATH);
         if shGetPathFromIDList(FQPIDL, PChar(FullPath)) then
           SetLength(FullPath, StrLen(PChar(FullPath)));

         {Filesize, attributes and -date:}
         DosError := FindFirst(ApiPath(FullPath), faAnyFile, SRec);
         FindClose(Srec);
         SRec.Name := ExtractFilePath(FullPath) + SRec.Name;

         {Displayname:}
         GetShellDisplayName(iRecycleFolder, PCurrList, SHGDN_FORPARSING, DisplayName);

         if (DosError = 0) and
            (((SRec.Attr and faDirectory) <> 0) or
             FileMatches(DisplayName, SRec)) then
         begin
           {Filetype and icon:}
           GetFileInfo(True, FQPIDL, '', False, 0, FileInfo, SHGFI_TYPENAME or SHGFI_SYSICONINDEX);

           NewItem := AddItem(Srec);
           NewItem.Caption := DisplayName;
           FileRec := NewItem.Data;
           FileRec^.Empty := False;
           FileRec^.IconEmpty := False;
           FileRec^.DisplayName := DisplayName;
           FileRec^.PIDL := FQPIDL;
           FileRec^.TypeName := FileInfo.szTypeName;
           if FileRec^.Typename = EmptyStr then
             FileRec^.TypeName := Format(STextFileExt, [FileRec.FileExt]);
           FileRec^.ImageIndex := FileInfo.iIcon;
         end
           else
         begin
           FreePIDL(FQPIDL);
         end;

         FreePIDL(PCurrList);
       except
         if Assigned(PCurrList) then
         try
           FreePIDL(PCurrList);
         except
         end;
       end;
     end; {While EnumList ...}
  end;
end; {LoadFromRecycleBin}

function TDirView.GetShellFolder(Dir: string): iShellFolder;
var
  Eaten: ULONG;
  Attr: ULONG;
  NewPIDL: PItemIDList;
begin
  Result := nil;
  if not Assigned(FDesktopFolder) then
    SHGetDesktopFolder(FDesktopFolder);

  if Assigned(FDesktopFolder) then
  begin
    Attr := 0;
    if Succeeded(FDesktopFolder.ParseDisplayName(
         ParentForm.Handle, nil, PChar(Dir), Eaten, NewPIDL, Attr)) then
    begin
      try
        assert(Assigned(NewPIDL));
        FDesktopFolder.BindToObject(NewPIDL, nil, IID_IShellFolder, Pointer(Result));
        Assert(Assigned(Result));
      finally
        FreePIDL(NewPIDL);
      end;
    end;
  end;
end; {GetShellFolder}

function TDirView.ItemIsDirectory(Item: TListItem): Boolean;
begin
  Result :=
    (Assigned(Item) and Assigned(Item.Data) and
    PFileRec(Item.Data)^.IsDirectory);
end;

function TDirView.ItemIsFile(Item: TListItem): Boolean;
begin
  Result :=
    (Assigned(Item) and Assigned(Item.Data) and
     (not PFileRec(Item.Data)^.IsParentDir));
end;

function TDirView.ItemIsParentDirectory(Item: TListItem): Boolean;
begin
  Result :=
    (Assigned(Item) and Assigned(Item.Data) and
    PFileRec(Item.Data)^.IsParentDir);
end;

function TDirView.ItemIsRecycleBin(Item: TListItem): Boolean;
begin
  Result := (Assigned(Item) and Assigned(Item.Data) and
    PFileRec(Item.Data)^.IsRecycleBin);
end;

function TDirView.ItemMatchesFilter(Item: TListItem; const Filter: TFileFilter): Boolean;
var
  FileRec: PFileRec;
begin
  Assert(Assigned(Item) and Assigned(Item.Data));
  FileRec := PFileRec(Item.Data);

  Result :=
    ((Filter.Masks = '') or
     FileNameMatchesMasks(FileRec^.FileName, FileRec^.IsDirectory,
       FileRec^.Size, FileTimeToDateTime(FileRec^.FileTime), Filter.Masks, False) or
     (FileRec^.IsDirectory and Filter.Directories and
      FileNameMatchesMasks(FileRec^.FileName, False,
       FileRec^.Size, FileTimeToDateTime(FileRec^.FileTime), Filter.Masks, False)));
end;

function TDirView.FileMatches(FileName: string; const SearchRec: TSearchRec): Boolean;
var
  Directory: Boolean;
  FileSize: Int64;
begin
  Result := (ShowHiddenFiles or ((SearchRec.Attr and SysUtils.faHidden) = 0));
  if not Result then
  begin
    Inc(FHiddenCount);
  end
    else
  if Mask <> '' then
  begin
    Directory := ((SearchRec.Attr and faDirectory) <> 0);
    if Directory then FileSize := 0
      else FileSize := SizeFromSRec(SearchRec);

    Result :=
      FileNameMatchesMasks(
        FileName,
        Directory,
        FileSize,
        FileTimeToDateTime(SearchRec.FindData.ftLastWriteTime),
        Mask, True);

    if not Result then
    begin
      Inc(FFilteredCount);
    end;
  end;
end;

function TDirView.ItemOverlayIndexes(Item: TListItem): Word;
begin
  Result := inherited ItemOverlayIndexes(Item);
  if Assigned(Item) and Assigned(Item.Data) then
  begin
    if PFileRec(Item.Data)^.IsParentDir then
      Inc(Result, oiDirUp);
  end;
end;

procedure TDirView.Load(DoFocusSomething: Boolean);
begin
  try
    StopIconUpdateThread;
    FIconUpdateQueue.Clear;
    FIconUpdateQueueDeferred.Clear;
    FIconUpdateSet.Clear;

    StopWatchThread;

    FChangeTimer.Enabled  := False;
    FChangeTimer.Interval := 0;

    inherited;
  finally
    if DirOK and not AbortLoading then
    begin
      if not IsRecycleBin then
        StartIconUpdateThread;
      StartWatchThread;
    end;
  end;
end;

procedure TDirView.LoadFiles;
var
  SRec: SysUtils.TSearchRec;
  DosError: Integer;
  DirsCount: Integer;
  SelTreeNode: TTreeNode;
  Node: TTreeNode;
  Drive: string;
begin
  FHiddenCount := 0;
  FFilteredCount := 0;

  try
    if Length(FPath) > 0 then
    begin
      Drive := DriveInfo.GetDriveKey(FPath);
      DriveInfo.ReadDriveStatus(Drive, dsSize);
      FDriveType := DriveInfo.Get(Drive).DriveType;
      FDirOK := DriveInfo.Get(Drive).DriveReady and DirectoryExists(ApiPath(FPath));
    end
      else
    begin
      FDriveType := DRIVE_UNKNOWN;
      FDirOK := False;
    end;

    if DirOK then
    begin
      if Assigned(FDriveView) then
        SelTreeNode := TDriveView(FDriveView).FindNodeToPath(FPath)
        else SelTreeNode := nil;

      if Assigned(FDriveView) and Assigned(SelTreeNode) then
          FIsRecycleBin := TNodeData(SelTreeNode.Data).IsRecycleBin
        else
      FIsRecycleBin :=
        (Uppercase(Copy(FPath, 2, 10)) = ':\RECYCLED') or
        (Uppercase(Copy(FPath, 2, 10)) = ':\RECYCLER');

      if not Assigned(FDesktopFolder) then
        SHGetDesktopFolder(FDesktopFolder);

      if IsRecycleBin then LoadFromRecycleBin(Path)
        else
      begin
        FParentFolder := GetShellFolder(PathName);

        DosError :=
          FindFirstEx(ApiPath(IncludeTrailingPathDelimiter(FPath) + '*.*'), FileAttr, SRec, FIND_FIRST_EX_LARGE_FETCH_PAS);
        while (DosError = 0) and (not AbortLoading) do
        begin
          if (SRec.Attr and faDirectory) = 0 then
          begin
            if FileMatches(SRec.Name, SRec) then
            begin
              AddItem(SRec);
            end;
          end;
          DosError := FindNext(SRec);
        end;
        SysUtils.FindClose(SRec);

        if AddParentDir and (not IsRoot) then
        begin
          AddParentDirItem;
        end;

        {Search for directories:}
        DirsCount := 0;
        DosError :=
          FindFirstEx(ApiPath(IncludeTrailingPathDelimiter(FPath) + '*.*'), DirAttrMask, SRec, FIND_FIRST_EX_LARGE_FETCH_PAS);
        while (DosError = 0) and (not AbortLoading) do
        begin
          if (SRec.Name <> '.') and (SRec.Name <> '..') and
             ((Srec.Attr and faDirectory) <> 0) then
          begin
            Inc(DirsCount);

            if FileMatches(SRec.Name, SRec) then
            begin
              AddItem(Srec);
            end;
          end;
          DosError := FindNext(SRec);
        end;
        SysUtils.FindClose(SRec);

        {Update TDriveView's subdir indicator:}
        if Assigned(FDriveView) and (FDriveType = DRIVE_REMOTE) then
          with TDriveView(FDriveView) do
          begin
            Node := FindNodeToPath(PathName);
            if Assigned(Node) and Assigned(Node.Data) and
               not TNodeData(Node.Data).Scanned then
            begin
              if DirsCount = 0 then
              begin
                Node.HasChildren := False;
                TNodeData(Node.Data).Scanned := True;
              end;
            end;
          end;
      end; {not isRecycleBin}
    end
      else FIsRecycleBin := False;

  finally
  end; {Finally}
end;

procedure TDirView.Reload2;
type
  PEFileRec = ^TEFileRec;
  TEFileRec = record
    iSize: Int64;
    iAttr: Integer;
    iFileTime: TFileTime;
    iIndex: Integer;
  end;
var
  Index: Integer;
  EItems: TStringList;
  FItems: TStringList;
  NewItems: TStringList;
  Srec: SysUtils.TSearchRec;
  DosError: Integer;
  PSrec: ^SysUtils.TSearchRec;
  Dummy: Integer;
  ItemIndex: Integer;
  AnyUpdate: Boolean;
  PUpdate: Boolean;
  PEFile: PEFileRec;
  SaveCursor: TCursor;
  FSize: Int64;
  FocusedIsVisible: Boolean;
begin
  if (not Loading) and LoadEnabled then
  begin
    if IsRecycleBin then Reload(True)
      else
    begin
      if not DirectoryExists(Path) then
      begin
        ClearItems;
        FDirOK := False;
        FDirty := False;
      end
        else
      begin
        FocusedIsVisible := Assigned(ItemFocused) and IsItemVisible(ItemFocused);

        SaveCursor := Screen.Cursor;
        Screen.Cursor := crHourGlass;
        FChangeTimer.Enabled  := False;
        FChangeTimer.Interval := 0;

        EItems := TStringlist.Create;
        EItems.CaseSensitive := True; // We want to reflect changes in file name case
        FItems := TStringlist.Create;
        FItems.CaseSensitive := True;
        NewItems := TStringlist.Create;

        PUpdate := False;
        AnyUpdate := False;

        FHiddenCount := 0;
        FFilteredCount := 0;

        try
          {Store existing files and directories:}
          for Index := 0 to Items.Count - 1 do
          begin
            New(PEFile);
            with PFileRec(Items[Index].Data)^ do
            begin
              PEFile^.iSize := Size;
              PEFile^.iAttr := Attr;
              PEFile^.iFileTime := FileTime;
              PEFile^.iIndex := Index;
            end;
            EItems.AddObject(PFileRec(Items[Index].Data)^.FileName, Pointer(PEFile));
          end;
          EItems.Sort;

          DosError :=
            FindFirstEx(ApiPath(IncludeTrailingPathDelimiter(FPath) + '*.*'), FileAttr, SRec, FIND_FIRST_EX_LARGE_FETCH_PAS);
          while DosError = 0 do
          begin
            if (SRec.Attr and faDirectory) = 0 then
            begin
              if FileMatches(SRec.Name, SRec) then
              begin
                ItemIndex := -1;
                if not EItems.Find(SRec.Name, ItemIndex) then
                begin
                  New(PSrec);
                  PSRec^ := SRec;
                  NewItems.AddObject(SRec.Name, Pointer(PSrec));
                  FItems.Add(Srec.Name);
                end
                  else
                begin
                  FSize := SizeFromSRec(SRec);
                  with PEFileRec(EItems.Objects[ItemIndex])^ do
{$WARNINGS OFF}
                  if (iSize <> FSize) or (iAttr <> SRec.Attr) or
                     not CompareMem(@iFileTime, @SRec.FindData.ftLastWriteTime,
                        SizeOf(iFileTime)) Then
{$WARNINGS ON}
                  begin
                    with PFileRec(Items[iIndex].Data)^ do
                    begin
                      Dec(FFilesSize, Size);
                      Inc(FFilesSize, FSize);
                      if Items[iIndex].Selected then
                      begin
                        Dec(FFilesSelSize, Size);
                        Inc(FFilesSelSize, FSize);
                      end;

                      Size := FSize;
                      Attr := SRec.Attr;
{$WARNINGS OFF}
                      FileTime := SRec.FindData.ftLastWriteTime;
{$WARNINGS ON}
                    end;
                    InvalidateItem(Items[iIndex]);
                    AnyUpdate := True;
                  end;
                  FItems.Add(Srec.Name);
                end;
              end;
            end;
            DosError := FindNext(Srec);
          end;
          SysUtils.FindClose(Srec);

          {Search new directories:}
          DosError :=
            FindFirstEx(ApiPath(FPath + '\*.*'), DirAttrMask, SRec, FIND_FIRST_EX_LARGE_FETCH_PAS);
          while DosError = 0 do
          begin
            if (Srec.Attr and faDirectory) <> 0 then
            begin
              if (SRec.Name <> '.') and (SRec.Name <> '..') then
              begin
                if not EItems.Find(SRec.Name, ItemIndex) then
                begin
                  if FileMatches(SRec.Name, SRec) then
                  begin
                    New(PSrec);
                    PSrec^ := SRec;
                    NewItems.AddObject(Srec.Name, Pointer(PSrec));
                    FItems.Add(SRec.Name);
                  end;
                end
                  else
                begin
                  FItems.Add(SRec.Name);
                end;
              end
                else
              begin
                FItems.Add(SRec.Name);
              end;
            end;
            DosError := FindNext(SRec);
          end;
          SysUtils.FindClose(SRec);

          {Check wether displayed Items still exists:}
          FItems.Sort;
          for Index := Items.Count - 1 downto 0 do
          begin
            if not FItems.Find(PFileRec(Items[Index].Data)^.FileName, Dummy) then
            begin
              if not PUpdate then
              begin
                PUpdate := True;
                Items.BeginUpdate;
              end;
              AnyUpdate := True;

              with PFileRec(Items[Index].Data)^ do
              begin
                Dec(FFilesSize, Size);
                // No need to decrease FFilesSelSize here as LVIF_STATE/deselect
                // is called for item being deleted
              end;

              Items[Index].Delete;
            end;
          end;

        finally
          try
            for Index := 0 to EItems.Count - 1  do
              Dispose(PEFileRec(EItems.Objects[Index]));
            EItems.Free;
            FItems.Free;
            for Index := 0 to NewItems.Count - 1 do
            begin
              if not PUpdate then
              begin
                PUpdate := True;
                Items.BeginUpdate;
              end;
              AnyUpdate := True;
              PSrec := Pointer(NewItems.Objects[Index]);
              AddItem(PSrec^);
              Dispose(PSrec);
            end;
            NewItems.Free;
            // if we are sorted by name and there were only updates to existing
            // items, there is no need for sorting
            if PUpdate or
               (AnyUpdate and (DirColProperties.SortDirColumn <> dvName)) then
            begin
              SortItems;
            end;
            if PUpdate then
              Items.EndUpdate;
          finally
            FDirOK := True;
            FDirty := false;
            if not FIsRecycleBin then
              StartIconUpdateThread;
            StartWatchThread;
            // make focused item visible, only if it was before
            if FocusedIsVisible and Assigned(ItemFocused) then
              ItemFocused.MakeVisible(False);

            DoUpdateStatusBar;

            Screen.Cursor := SaveCursor;
          end;
        end; {Finally}
      end;

      if Assigned(FDriveView) then
      begin
        TDriveView(FDriveView).ValidateCurrentDirectoryIfNotMonitoring;
      end;
    end;
  end;
end; {Reload2}

procedure TDirView.PerformItemDragDropOperation(Item: TListItem; Effect: Integer; Paste: Boolean);
var
  TargetPath: string;
  RenameOnCollision: Boolean;
begin
  TargetPath := '';
  RenameOnCollision := False;

  if Assigned(Item) then
  begin
    if Assigned(Item.Data) then
    begin
      if ItemIsParentDirectory(Item) then
        TargetPath := ExcludeTrailingPathDelimiter(ExtractFilePath(Path))
      else
        TargetPath := IncludeTrailingPathDelimiter(PathName) + ItemFileName(Item);
    end;
  end
    else
  begin
    TargetPath := PathName;
    RenameOnCollision := DDOwnerIsSource and (Effect = DROPEFFECT_COPY);
  end;

  if TargetPath <> '' then
    PerformDragDropFileOperation(TargetPath, Effect, RenameOnCollision, Paste);
end;

procedure TDirView.ReLoad(CacheIcons: Boolean);
begin
  if not FLoadEnabled then FDirty := True
    else inherited;
end; {ReLoad}

function TDirView.GetAttrString(Attr: Integer): string;
const
  Attrs: array[1..5] of Integer =
    (FILE_ATTRIBUTE_COMPRESSED, FILE_ATTRIBUTE_ARCHIVE,
     FILE_ATTRIBUTE_SYSTEM, FILE_ATTRIBUTE_HIDDEN,
     FILE_ATTRIBUTE_READONLY);
  AttrChars: array[1..5] of Char = ('c', 'a', 's', 'h', 'r');
var
  Index: Integer;
  LowBound: Integer;
begin
  Result := '';
  if Attr <> 0 then
  begin
    LowBound := Low(Attrs);

    for Index := LowBound to High(Attrs) do
      if (Attr and Attrs[Index] <> 0) then
        Result := Result + AttrChars[Index]
      else
        Result := Result;
  end;
end; {GetAttrString}

function TDirView.GetFileInfo(
  CanUsePIDL: Boolean; PIDL: PItemIDList; Path: string; CanTimeout: Boolean;
  dwFileAttributes: DWORD; var psfi: TSHFileInfoW; uFlags: UINT): DWORD_PTR;
var
  pszPath: LPCWSTR;
  cbFileInfo: UINT;
begin
  cbFileInfo := SizeOf(psfi);
  FillChar(psfi, cbFileInfo, #0);

  if CanUsePIDL and Assigned(PIDL) then
  begin
    pszPath := PChar(PIDL);
    uFlags := uFlags or SHGFI_PIDL;
  end
    else pszPath := PChar(Path);

  // CanTimeout is False in scenarios, where we did not have any reports of hangs, to avoid thread overhead.
  if TimeoutShellIconRetrieval and CanTimeout then
  begin
    Result := SHGetFileInfoWithTimeout(pszPath, dwFileAttributes, psfi, cbFileInfo, uFlags, MSecsPerSec div 4);
  end
    else
  begin
    Result := SHGetFileInfo(pszPath, dwFileAttributes, psfi, cbFileInfo, uFlags);
  end;

  if Result = 0 then
  begin
    psfi.szTypeName[0] := #0;
    psfi.iIcon := 0;
  end;
end;

procedure TDirView.DoFetchIcon(
  FilePath: string; IsSpecialExt: Boolean; CanTimeout: Boolean; FileRec: PFileRec; var ImageIndex: Integer; var TypeName: string);
var
  Eaten: ULONG;
  shAttr: ULONG;
  FileInfo: TShFileInfo;
  ForceByName: Boolean;
  FileIconForName: string;
begin
  {Fetch the Item FQ-PIDL:}
  if not Assigned(FileRec^.PIDL) and IsSpecialExt then
  begin
    try
      ShAttr := 0;
      FDesktopFolder.ParseDisplayName(
        ParentForm.Handle, nil, PChar(FilePath), Eaten, FileRec^.PIDL, ShAttr);
    except
    end;
  end;

  if FileRec^.IsDirectory then
  begin
    if FDriveType = DRIVE_FIXED then
    begin
      try
        {Retrieve icon and typename for the directory}
        GetFileInfo(True, FileRec^.PIDL, FilePath, False, 0, FileInfo, SHGFI_TYPENAME or SHGFI_SYSICONINDEX);

        if (FileInfo.iIcon <= 0) or (FileInfo.iIcon > SmallImages.Count) then
        begin
          {Invalid icon returned: retry with access file attribute flag:}
          GetFileInfo(
            False, nil, FilePath, False,
            FILE_ATTRIBUTE_DIRECTORY, FileInfo, SHGFI_TYPENAME or SHGFI_SYSICONINDEX or SHGFI_USEFILEATTRIBUTES);
        end;
        TypeName := FileInfo.szTypeName;
        ImageIndex := FileInfo.iIcon;
      except
        {Capture exceptions generated by the shell}
        TypeName := StdDirTypeName;
        ImageIndex := StdDirIcon;
      end;
    end
      else
    begin
      TypeName := StdDirTypeName;
      ImageIndex := StdDirIcon;
    end;
  end
    else
  begin
    {Retrieve icon and typename for the file}
    try
      ForceByName := False;
      FileIconForName := FilePath;
      if Assigned(OnFileIconForName) then
      begin
        OnFileIconForName(Self, FileIconForName);
        ForceByName := (FileIconForName <> FilePath);
      end;
      // Files with PIDL are typically .exe files.
      // It may take long to retrieve an icon from exe file.
      // We typically do not get here, now that we have UseIconUpdateThread enabled.
      if GetFileInfo(
           (not ForceByName), FileRec^.PIDL, FileIconForName, CanTimeout, FILE_ATTRIBUTE_NORMAL, FileInfo,
           SHGFI_TYPENAME or SHGFI_USEFILEATTRIBUTES or SHGFI_SYSICONINDEX) = 0 then
      begin
        if Assigned(FileRec^.PIDL) then
        begin
          FileInfo.iIcon := DefaultExeIcon;
        end;
      end;
      TypeName := FileInfo.szTypeName;
      ImageIndex := FileInfo.iIcon;

    except
      {Capture exceptions generated by the shell}
      ImageIndex := UnknownFileIcon;
    end;
  end;
end;

procedure TDirView.GetDisplayData(Item: TListItem; FetchIcon: Boolean);
var
  FileInfo: TShFileInfo;
  IsSpecialExt: Boolean;
  FileRec: PFileRec;
  FilePath: string;
  FileAttributes: UINT;
begin
  Assert(Assigned(Item) and Assigned(Item.Data));
  FileRec := PFileRec(Item.Data);
  with FileRec^ do
  begin
    IsSpecialExt := MatchesFileExt(FileExt, SpecialExtensions);

    FetchIcon := IconEmpty and (FetchIcon or not IsSpecialExt);

    if Empty or FetchIcon then
    begin
      FilePath := FPath + '\' + FileName;
      if FetchIcon then
      begin
        DoFetchIcon(FilePath, IsSpecialExt, True, FileRec, ImageIndex, TypeName);
        IconEmpty := False;

        if Length(TypeName) = 0 then
          TypeName := Format(STextFileExt, [FileExt]);
      end
        else
      begin
        try
          if IsDirectory then FileAttributes := FILE_ATTRIBUTE_DIRECTORY
            else FileAttributes := FILE_ATTRIBUTE_NORMAL;

          GetFileInfo(
            False, nil, FilePath, False, FileAttributes, FileInfo,
            SHGFI_TYPENAME or SHGFI_USEFILEATTRIBUTES);
          TypeName := FileInfo.szTypeName;
        except
          {Capture exceptions generated by the shell}
          TypeName := '';
        end;

        if IconEmpty then
        begin
          if FileExt = ExeExtension then ImageIndex := DefaultExeIcon
            else ImageIndex := UnknownFileIcon;
        end;
      end;
      Empty := False;
    end;
  end;
end; {GetDisplayData}

function TDirView.GetDirOK: Boolean;
begin
  Result := FDirOK;
end;

function TDirView.ItemFullFileName(Item: TListItem): string;
begin
  if Assigned(Item) and Assigned(Item.Data) then
  begin
    if not IsRecycleBin then
    begin
      if PFileRec(Item.Data)^.IsParentDir then
      begin
        Result := ExcludeTrailingBackslash(ExtractFilePath(FPath));
      end
        else
      begin
        Result := FPath + '\' + PFileRec(Item.Data)^.FileName;
      end;
    end
      else
    Result := PFileRec(Item.Data)^.FileName;
  end
    else
  Result := EmptyStr;
end; {ItemFullFileName}

function TDirView.ItemFileNameOnly(Item: TListItem): string;
begin
  Assert(Assigned(Item) and Assigned(Item.Data));
  Result := PFileRec(Item.Data)^.FileName;
  SetLength(Result, Length(Result) - Length(ItemFileExt(Item)));
end; {ItemFileNameOnly}

function TDirView.ItemFileExt(Item: TListItem): string;
begin
  Assert(Assigned(Item) and Assigned(Item.Data));
  Result := ExtractFileExt(PFileRec(Item.Data)^.FileName);
end; {ItemFileExt}

function CompareFileType(I1, I2: TListItem; P1, P2: PFileRec): Integer;
var
  Key1, Key2: string;
begin
  if P1.Empty then TDirView(I1.ListView).GetDisplayData(I1, False);
  if P2.Empty then TDirView(I2.ListView).GetDisplayData(I2, False);
  if P1.IsDirectory then
  begin
    Key1 := P1.TypeName + ' ' + P1.DisplayName;
    Key2 := P2.TypeName + ' ' + P2.DisplayName;
  end
    else
  begin
    Key1 := P1.TypeName + ' ' + P1.FileExt + ' ' + P1.DisplayName;
    Key2 := P2.TypeName + ' ' + P2.FileExt + ' ' + P2.DisplayName;
  end;
  Result := CompareLogicalTextPas(Key1, Key2, TDirView(I1.ListView).NaturalOrderNumericalSorting);
end;

function CompareFileTime(P1, P2: PFileRec): Integer;
var
  Time1, Time2: Int64;
begin
  Time1 := Int64(P1.FileTime.dwHighDateTime) shl 32 + P1.FileTime.dwLowDateTime;
  Time2 := Int64(P2.FileTime.dwHighDateTime) shl 32 + P2.FileTime.dwLowDateTime;
  if Time1 < Time2 then Result := -1
    else
  if Time1 > Time2 then Result := 1
    else Result := 0; // fallback
end;

function GetItemFileSize(P: PFileRec): Int64; inline;
begin
  Result := 0;
  if P.Size >= 0 then Result := P.Size
    else
  if P.CalculatedSize >= 0 then Result := P.CalculatedSize;
end;

function CompareFile(I1, I2: TListItem; AOwner: TDirView): Integer; stdcall;
var
  ConsiderDirection: Boolean;
  P1, P2: PFileRec;
begin
  ConsiderDirection := True;
  if I1 = I2 then Result := 0
    else
  if I1 = nil then Result := -1
    else
  if I2 = nil then Result := 1
    else
  begin
    P1 := PFileRec(I1.Data);
    P2 := PFileRec(I2.Data);
    if P1.isParentDir then
    begin
      Result := -1;
      ConsiderDirection := False;
    end
      else
    if P2.isParentDir then
    begin
      Result := 1;
      ConsiderDirection := False;
    end
      else
    {Directories should always appear "grouped":}
    if P1.isDirectory <> P2.isDirectory then
    begin
      if P1.isDirectory then
      begin
        Result := -1;
        ConsiderDirection := False;
      end
        else
      begin
        Result := 1;
        ConsiderDirection := False;
      end;
    end
      else
    begin
      Result := 0;

      if P1.isDirectory and AOwner.AlwaysSortDirectoriesByName then
      begin
        // fallback
      end
        else
      begin
        case AOwner.DirColProperties.SortDirColumn of
          dvName:
            ; // fallback

          dvSize:
            if GetItemFileSize(P1) < GetItemFileSize(P2) then Result := -1
              else
            if GetItemFileSize(P1) > GetItemFileSize(P2) then Result := 1
              else ; // fallback

          dvType:
            Result := CompareFileType(I1, I2, P1, P2);

          dvChanged:
            Result := CompareFileTime(P1, P2);

          dvAttr:
            if P1.Attr < P2.Attr then Result := -1
              else
            if P1.Attr > P2.Attr then Result := 1
              else ; // fallback

          dvExt:
            if not P1.isDirectory then
            begin
              Result := CompareLogicalTextPas(
                P1.FileExt + ' ' + P1.DisplayName, P2.FileExt + ' ' + P2.DisplayName,
                AOwner.NaturalOrderNumericalSorting);
            end
              else ; //fallback

          else
            ; // fallback
        end;
      end;

      if Result = 0 then
      begin
        Result := CompareLogicalTextPas(P1.DisplayName, P2.DisplayName, AOwner.NaturalOrderNumericalSorting)
      end;
    end;
  end;

  if ConsiderDirection and (not AOwner.SortAscending) then
  begin
    Result := -Result;
  end;
end;

procedure TDirView.SortItems;
begin
  if HandleAllocated then
  begin
    StopIconUpdateThread;
    try
      CustomSortItems(@CompareFile);
    finally
      if (not Loading) then
        StartIconUpdateThread;
    end;
  end
end;

procedure TDirView.ValidateFile(Item : TListItem);
var
  Index: Integer;
begin
  if Assigned(Item) and Assigned(Item.Data) then
  begin
    Index := Item.Index;
    if not FileExists(ApiPath(ItemFullFileName(Items[Index]))) then
    begin
      Item.Delete;
    end;
  end;
end; {ValidateFile}

procedure TDirView.ValidateFile(FileName: TFileName);
var
  FilePath: string;
begin
  FilePath := ExcludeTrailingPathDelimiter(ExtractFilePath(FileName));
  if IsRecycleBin then ValidateFile(FindFileItem(FileName))
    else
  if FilePath = Path then
    ValidateFile(FindFileItem(ExtractFileName(FileName)));
end; {ValidateFile}

procedure TDirView.ValidateSelectedFiles;
var
  FileList: TStrings;
  i: Integer;
  ToDelete: Boolean;
  Updating: Boolean;
  Updated: Boolean;
  Item: TListItem;
begin
  if SelCount > 50 then Reload2
    else
  begin
    Updating := False;
    Updated := False;
    FileList := CustomCreateFileList(True, False, True, nil, True);
    try
      for i := 0 to FileList.Count - 1 do
      begin
        Item := TListItem(FileList.Objects[i]);
        if ItemIsDirectory(Item) then
          ToDelete := not DirectoryExists(ApiPath(FileList[i]))
        else
          ToDelete := not FileExists(ApiPath(FileList[i]));

        if ToDelete then
        begin
          if (SelCount > 10) and (not Updating) then
          begin
            Items.BeginUpdate;
            Updating := True;
          end;
          with PFileRec(Item.Data)^ do
          begin
            Dec(FFilesSize, Size);
            // No need to decrease FFilesSelSize here as LVIF_STATE/deselect
            // is called for item being deleted
          end;
          Item.Delete;
          Updated := True;
        end;
      end;
    finally
      if Updating then
        Items.EndUpdate;
      if Updated then
        DoUpdateStatusBar;
      FileList.Free;
    end;
  end;
end; {ValidateSelectedFiles}

procedure TDirView.CreateDirectory(DirName: string);
var
  SRec: SysUtils.TSearchRec;
  Item: TListItem;
begin
  // keep absolute path as is
  if ExtractFileDrive(DirName) = '' then
    DirName := Path + '\' + DirName;

  if WatchForChanges then StopWatchThread;

  if Assigned(FDriveView) then
    TDriveView(FDriveView).StopWatchThread;

  StopIconUpdateThread;
  try
    {create the physical directory:}
    Win32Check(Windows.CreateDirectory(PChar(ApiPath(DirName)), nil));

    if IncludeTrailingBackslash(ExtractFilePath(ExpandFileName(DirName))) =
         IncludeTrailingBackslash(Path) then
    begin
      {Create the TListItem:}
      if FindFirst(ApiPath(DirName), faAnyFile, SRec) = 0 then
      begin
        Item := AddItem(SRec);
        ItemFocused := FindFileItem(GetFileRec(Item.Index)^.FileName);
        SortItems;
        if Assigned(ItemFocused) then
        begin
          ItemFocused.MakeVisible(False);
        end;
      end;
      FindClose(SRec);
    end;

  finally
    StartIconUpdateThread;

    if WatchForChanges then StartWatchThread;
    if Assigned(DriveView) then
      with DriveView do
      begin
        if Assigned(Selected) then
          ValidateDirectory(Selected);
        TDriveView(FDriveView).StartWatchThread;
      end;

  end;
end; {CreateDirectory}

procedure TDirView.DisplayContextMenu(Where: TPoint);
var
  FileList: TStringList;
  Index: Integer;
  Item: TListItem;
  DefDir: string;
  Verb: string;
  PIDLArray: PPIDLArray;
  Count: Integer;
  DiffSelectedPath: Boolean;
  WithEdit: Boolean;
  PIDLRel: PItemIDList;
  PIDLPath: PItemIDList;
  Handled: Boolean;
begin
  GetDir(0, DefDir);
  ChDir(PathName);
  Verb := EmptyStr;
  StopWatchThread;
  try
    try
      if Assigned(OnContextPopup) then
      begin
        Handled := False;
        OnContextPopup(Self, ScreenToClient(Where), Handled);
        if Handled then Abort;
      end;
      if (MarkedCount > 1) and
         ((not Assigned(ItemFocused)) or ItemFocused.Selected) then
      begin
        if FIsRecycleBin then
        begin
          Count := 0;
          GetMem(PIDLArray, SizeOf(PItemIDList) * SelCount);
          try
            FillChar(PIDLArray^, Sizeof(PItemIDList) * SelCount, #0);
            for Index := Selected.Index to Items.Count - 1 do
              if Items[Index].Selected then
              begin
                PIDL_GetRelative(PFileRec(Items[Index].Data)^.PIDL, PIDLPath, PIDLRel);
                FreePIDL(PIDLPath);
                PIDLArray^[Count] := PIDLRel;
                Inc(Count);
              end;

            try
              ShellDisplayContextMenu(ParentForm.Handle, Where, iRecycleFolder, Count,
                PidlArray^[0], False, Verb, False);
            finally
              for Index := 0 to Count - 1 do
                FreePIDL(PIDLArray[Index]);
            end;
          finally
            FreeMem(PIDLArray, Count);
          end;
        end
          else
        begin
          FileList := TStringList.Create;
          CreateFileList(False, True, FileList);
          for Index := 0 to FileList.Count - 1 do
            FileList[Index] := ExtractFileName(FileList[Index]);
          ShellDisplayContextMenu(ParentForm.Handle, Where, PathName,
            FileList, Verb, False);
          FileList.Destroy;
        end;

        {------------ Cut -----------}
        if Verb = shcCut then
        begin
          LastClipBoardOperation := cboCut;
          {Clear items previous marked as cut:}
          Item := GetNextItem(nil, sdAll, [isCut]);
          while Assigned(Item) do
          begin
            Item.Cut := False;
            Item := GetNextItem(Item, sdAll, [isCut]);
          end;
          {Set property cut to TRUE for all selected items:}
          Item := GetNextItem(nil, sdAll, [isSelected]);
          while Assigned(Item) do
          begin
            Item.Cut := True;
            Item := GetNextItem(Item, sdAll, [isSelected]);
          end;
        end
          else
        {----------- Copy -----------}
        if Verb = shcCopy then LastClipBoardOperation := cboCopy
          else
        {----------- Paste ----------}
        if Verb = shcPaste then
            PasteFromClipBoard(ItemFullFileName(Selected))
          else
        if not FIsRecycleBin then Reload2;
      end
        else
      if Assigned(ItemFocused) and Assigned(ItemFocused.Data) then
      begin
        Verb := EmptyStr;
        WithEdit := not FIsRecycleBin and CanEdit(ItemFocused);
        LoadEnabled := True;

        if FIsRecycleBin then
        begin
          PIDL_GetRelative(PFileRec(ItemFocused.Data)^.PIDL, PIDLPath, PIDLRel);
          ShellDisplayContextMenu(ParentForm.Handle, Where,
            iRecycleFolder, 1, PIDLRel, False, Verb, False);
          FreePIDL(PIDLRel);
          FreePIDL(PIDLPath);
        end
          else
        begin
          ShellDisplayContextMenu(ParentForm.Handle, Where,
            ItemFullFileName(ItemFocused), WithEdit, Verb,
            not PFileRec(ItemFocused.Data)^.isDirectory);
          LoadEnabled := True;
        end; {not FIsRecycleBin}

        {---------- Rename ----------}
        if Verb = shcRename then ItemFocused.EditCaption
          else
        {------------ Cut -----------}
        if Verb = shcCut then
        begin
          LastClipBoardOperation := cboCut;

          Item := GetNextItem(nil, sdAll, [isCut]);
          while Assigned(Item) do
          begin
            Item.Cut := False;
            Item := GetNextItem(ITem, sdAll, [isCut]);
          end;
          ItemFocused.Cut := True;
        end
          else
        {----------- Copy -----------}
        if Verb = shcCopy then LastClipBoardOperation := cboCopy
          else
        {----------- Paste ----------}
        if Verb = shcPaste then
        begin
          if PFileRec(ItemFocused.Data)^.IsDirectory then
          PasteFromClipBoard(ItemFullFileName(ItemFocused));
        end
          else
        if not FIsRecycleBin then Reload2;
      end;
    finally
      ChDir(DefDir);
    end;

    if IsRecycleBin and (Verb <> shcCut) and (Verb <> shcProperties) and (SelCount > 0) then
    begin
      DiffSelectedPath := False;
      for Index := Selected.Index to Items.Count - 1 do
        if ExtractFilePath(PFileRec(Items[Index].Data)^.FileName) <> FPath + '\' then
        begin
          DiffSelectedPath := True;
          Break;
        end;

      if DiffSelectedPath then
      begin
        StartFileDeleteThread;
        Exit;
      end;
    end;

    Sleep(250);
    ValidateSelectedFiles;

  finally
    StartWatchThread;
  end;
end;

procedure TDirView.GetDisplayInfo(ListItem: TListItem;
  var DispInfo: TLVItem);
var
  Value: string;
  ASize: Int64;
  FetchIcon: Boolean;
begin
  Assert(Assigned(ListItem) and Assigned(ListItem.Data));
  with PFileRec(ListItem.Data)^, DispInfo  do
  begin
    {Fetch display data of current file:}
    if Empty then
    begin
      FetchIcon :=
        IconEmpty and
        (not FUseIconUpdateThread or (ViewStyle <> vsReport));
      GetDisplayData(ListItem, FetchIcon);
    end;

    if IconEmpty and
       (not FUseIconUpdateThread or
        (ViewStyle <> vsReport)) and
       ((DispInfo.Mask and LVIF_IMAGE) <> 0) then
      GetDisplayData(ListItem, True);

    {Set IconUpdatethread :}
    if IconEmpty and UseIconUpdateThread and (not FIsRecycleBin) then
    begin
      IconUpdateEnqueue(ListItem);
    end;

    if (DispInfo.Mask and LVIF_TEXT) <> 0 then
    begin
      Value := '';
      if iSubItem = 0 then Value := DisplayName
        else
      if iSubItem < DirViewColumns then
      begin
        case TDirViewCol(iSubItem) of
          dvSize: {Size:     }
            begin
              if not IsDirectory then ASize := Size
                else ASize := CalculatedSize;
              if ASize >= 0 then Value := FormatPanelBytes(ASize, FormatSizeBytes);
            end;
          dvType: {FileType: }
            Value := TypeName;
          dvChanged: {Date}
            // Keep consistent with UserModificationStr
            Value := FormatDateTime('ddddd tt', FileTimeToDateTime(FileTime));
          dvAttr: {Attrs:}
            Value := GetAttrString(Attr);
          dvExt:
            Value := FileExt;
        end {Case}
      end; {SubItem}
      StrPLCopy(pszText, Value, cchTextMax - 1);
    end;

    {Set display icon of current file:}
    if (iSubItem = 0) and ((DispInfo.Mask and LVIF_IMAGE) <> 0) then
    begin
      iImage := PFileRec(ListItem.Data).ImageIndex;
      Mask := Mask or LVIF_DI_SETITEM;
    end;
  end; {With PFileRec Do}
end;

function TDirView.ItemColor(Item: TListItem): TColor;
begin
  if PFileRec(Item.Data).Attr and FILE_ATTRIBUTE_COMPRESSED <> 0 then
  begin
    if SupportsDarkMode and DarkMode then Result := clSkyBlue
      else Result := clBlue;
  end
    else
  if DimmHiddenFiles and not Item.Selected and
     (PFileRec(Item.Data).Attr and FILE_ATTRIBUTE_HIDDEN <> 0) then
      Result := clGrayText
    else
  Result := clDefaultItemColor;
end;

function TDirView.ItemThumbnail(Item: TListItem; Size: TSize): TBitmap;
var
  ItemData: PFileRec;
begin
  if not UseIconUpdateThread then
  begin
    // not supported without update thread
    Result := nil;
  end
    else
  begin
    ItemData := PFileRec(Item.Data);
    if (not Assigned(ItemData.Thumbnail)) or
       (ItemData.ThumbnailSize <> Size) then
    begin
      FreeAndNil(ItemData.Thumbnail);
      ItemData.ThumbnailSize := Size;
      Result := nil;
      IconUpdateEnqueue(Item);
    end
      else
    begin
      Result := ItemData.Thumbnail;
    end;
  end;
end;

procedure TDirView.StartFileDeleteThread;
var
  Files: TStringList;
begin
  Files := TStringList.Create;
  try
    CreateFileList(False, True, Files);
    TFileDeleteThread.Create(Files, MaxWaitTimeOut, SignalFileDelete);
  finally
    Files.Free;
  end;
end;

procedure TDirView.IconUpdateEnqueue(ListItem: TListItem);
var
  Schedule: TIconUpdateSchedule;
begin
  if not FIconUpdateSet.ContainsKey(ListItem.Index) then
  begin
    FIconUpdateSet.Add(ListItem.Index, False);
    Schedule.Index := ListItem.Index;
    FIconUpdateQueue.Enqueue(Schedule);
    Assert(FIconUpdateSet.Count = FIconUpdateQueue.Count + FIconUpdateQueueDeferred.Count);
  end;
  StartIconUpdateThread;
end;

function TDirView.IconUpdatePeek: Integer;
begin
  if FIconUpdateQueue.Count > 0 then
    Result := FIconUpdateQueue.Peek.Index
  else if FIconUpdateQueueDeferred.Count > 0 then
    Result := FIconUpdateQueueDeferred.Peek.Index
  else
    Result := -1;
end;

procedure TDirView.IconUpdateDequeue;
begin
  if FIconUpdateQueue.Count > 0 then
    FIconUpdateQueue.Dequeue
  else
    FIconUpdateQueueDeferred.Dequeue;
  FIconUpdateSet.Remove(FIconUpdateThread.FCurrentIndex);
  Assert(FIconUpdateSet.Count = FIconUpdateQueue.Count + FIconUpdateQueueDeferred.Count);
end;

function TDirView.ThumbnailNeeded(ItemData: PFileRec): Boolean;
begin
  Result := (not Assigned(ItemData.Thumbnail)) and (ItemData.ThumbnailSize <> ThumbnailNotNeeded);
end;

procedure TDirView.DoFetchIconUpdate;
var
  Item: TListItem;
  ItemData: PFileRec;
  Invisible: Boolean;
begin
  FIconUpdateThread.FCurrentIndex := IconUpdatePeek;
  if FIconUpdateThread.FCurrentIndex < 0 then
  begin
    FIconUpdateThread.Suspend;
  end
    else
  begin
    // We could loop here until we find a valid item, but we want to release the GUI thread frequently
    if FIconUpdateThread.FCurrentIndex >= Items.Count then
    begin
      FIconUpdateThread.FCurrentIndex := -1;
      IconUpdateDequeue;
    end
      else
    begin
      Item := Items[FIconUpdateThread.FCurrentIndex];
      Assert(Assigned(Item));
      Assert(Assigned(Item.Data));
      ItemData := PFileRec(Item.Data);

      Invisible := IsVista and (not IsItemVisible(Item));

      if (Invisible or (not FThumbnail)) and
         (not Assigned(ItemData.Thumbnail)) then
      begin
        ItemData.ThumbnailSize := ThumbnailNotNeeded; // not needed anymore
      end;

      // Deprioritizing unvisible item taken from priority queue.
      // As we ask Window to cache the image index (LVIF_DI_SETITEM), we won't get asked again,
      // so we have to retrieve the image eventually (but not thumbnail)
      if (FIconUpdateQueue.Count > 0) and
         Invisible then
      begin
        Assert(not ThumbnailNeeded(ItemData));
        if ItemData.IconEmpty then
        begin
          FIconUpdateQueueDeferred.Enqueue(FIconUpdateQueue.Dequeue);
        end
          else
        begin
          IconUpdateDequeue;
        end;
        FIconUpdateThread.FCurrentIndex := -1;
      end
        else
      begin
        if ItemData.IconEmpty or
           ThumbnailNeeded(ItemData) then
        begin
          FIconUpdateThread.FCurrentFilePath := ItemFullFileName(Item);
          FIconUpdateThread.FCurrentItemData := ItemData^;
        end
          else
        begin
          IconUpdateDequeue;
          FIconUpdateThread.FCurrentIndex := -1;
        end;
      end;
    end;
  end;
end;

procedure TDirView.DoUpdateIcon;
var
  Item: TListItem;
  ItemData: PFileRec;
  LVI: TLVItem;
begin
  // otherwise just throw away the resolved icon and let this or future background thread
  // retry with the same or different item the next time
  if (not Loading) and
     (not FIconUpdateThread.Terminated) and
     (FIconUpdateThread.FCurrentIndex = IconUpdatePeek) then
  begin
    IconUpdateDequeue;

    if (FIconUpdateThread.FCurrentIndex >= 0) and
       (FIconUpdateThread.FCurrentIndex < Items.Count) then
    begin
      Item := Items[FIconUpdateThread.FCurrentIndex];
      if FIconUpdateThread.FCurrentFilePath = ItemFullFileName(Item) then
      begin
        Assert(Assigned(Item));
        Assert(Assigned(Item.Data));
        ItemData := PFileRec(Item.Data);

        if (FIconUpdateThread.FSyncIcon >= 0) and (ItemData^.ImageIndex <> FIconUpdateThread.FSyncIcon) then
        begin
          ItemData^.ImageIndex := FIconUpdateThread.FSyncIcon;

          if not FIconUpdateThread.Terminated then
          begin
            {To avoid flickering of the display use Listview_SetItem
            instead of using the property ImageIndex:}
            LVI.mask := LVIF_IMAGE;
            LVI.iItem := FIconUpdateThread.FCurrentIndex;
            LVI.iSubItem := 0;
            LVI.iImage := I_IMAGECALLBACK;
            ListView_SetItem(Handle, LVI);
          end;
        end;
        ItemData^.IconEmpty := False;

        if Assigned(FIconUpdateThread.FSyncThumbnail) then
        begin
          ItemData^.Thumbnail := FIconUpdateThread.FSyncThumbnail;
          FIconUpdateThread.FSyncThumbnail := nil;
          // It can happen that this is called while the very item is being painted,
          // (particularly ImageFactory.GetImage pumps the queue).
          // Calling InvalidateRect directly would get ignored then.
          PostMessage(WindowHandle, WM_USER_INVALIDATEITEM, Item.Index, 0);
        end;
      end;
    end;
  end;
end; {TIconUpdateThread.DoUpdateIcon}

procedure TDirView.StartIconUpdateThread;
begin
  if DirOK and UseIconUpdateThread then
  begin
    if not Assigned(FIconUpdateThread) then
      FIconUpdateThread := TIconUpdateThread.Create(Self);
    FIconUpdateThread.Resume;
  end;
end; {StartIconUpdateThread}

procedure TDirView.StopIconUpdateThread;
begin
  if Assigned(FIconUpdateThread) then
  begin
    FIconUpdateThread.Terminate;
    FIconUpdateThread.Priority := tpHigher;
    if FIconUpdateThread.Suspended then
      FIconUpdateThread.Resume;
    if not FIconUpdateThread.WaitFor(MSecsPerSec div 4) then
    begin
      // This prevents Destroy from waiting for (stalled) thread
      FIconUpdateThread.Suspend;
    end;
    FreeAndNil(FIconUpdateThread);
  end;
end; {StopIconUpdateThread}

procedure TDirView.StopWatchThread;
begin
  if Assigned(FDiscMonitor) then
  begin
    FDiscMonitor.Enabled := False;
  end;
end; {StopWatchThread}

procedure TDirView.StartWatchThread;
begin
  if (Length(Path) > 0) and WatchForChanges and DirOK then
  begin
    if not Assigned(FDiscMonitor) then
    begin
      FDiscMonitor := TDiscMonitor.Create(Self);
      with FDiscMonitor do
      begin
        ChangeDelay := msThreadChangeDelay;
        SubTree := False;
        Filters := [moDirName, moFileName, moSize, moAttributes, moLastWrite];
        SetDirectory(PathName);
        OnChange := ChangeDetected;
        OnInvalid := ChangeInvalid;
        Open;
      end;
    end
      else
    begin
      FDiscMonitor.SetDirectory(PathName);
      FDiscMonitor.Enabled := True;
    end;
  end;
end; {StartWatchThread}

procedure TDirView.TimerOnTimer(Sender: TObject);
begin
  if not Loading then
  begin
    // fix by MP: disable timer and reload directory before call to event
    FChangeTimer.Enabled := False;
    FChangeTimer.Interval := 0;
    Reload2;
  end;
end; {TimerOnTimer}

procedure TDirView.ChangeDetected(Sender: TObject; const Directory: string;
  var SubdirsChanged: Boolean);
begin
  // avoid prolonging the actual update with each change, as if continous change
  // is occuring in current directory, the panel will never be updated
  if not FChangeTimer.Enabled then
  begin
    FDirty := True;
    FChangeTimer.Interval := FChangeInterval;
    FChangeTimer.Enabled := True;
  end;
end; {ChangeDetected}

procedure TDirView.ChangeInvalid(Sender: TObject; const Directory: string;
  const ErrorStr: string);
begin
  FDiscMonitor.Close;
end; {ChangeInvalid}

function TDirView.WatchThreadActive: Boolean;
begin
  Result := WatchForChanges and Assigned(FDiscMonitor) and
    FDiscMonitor.Active and FDiscMonitor.Enabled;
end; {WatchThreadActive}

procedure TDirView.SetChangeInterval(Value: Cardinal);
begin
  if Value > 0 then
  begin
    FChangeInterval := Value;
    FChangeTimer.Interval := Value;
  end;
end; {SetChangeInterval}

procedure TDirView.SetDirColProperties(Value: TDirViewColProperties);
begin
  if Value <> ColProperties then
    ColProperties := Value;
end;

function TDirView.GetDirColProperties: TDirViewColProperties;
begin
  Result := TDirViewColProperties(ColProperties);
end;

procedure TDirView.SetWatchForChanges(Value: Boolean);
begin
  if WatchForChanges <> Value then
  begin
    FWatchForChanges := Value;
    if not (csDesigning in ComponentState) then
    begin
      if Value then StartWatchThread
        else StopWatchThread;
    end;
  end;
end; {SetWatchForChanges}

procedure TDirView.DisplayPropertiesMenu;
var
  FileList: TStringList;
  Index: Integer;
  PIDLRel: PItemIDList;
  PIDLPath: PItemIDList;
begin
  if not Assigned(ItemFocused) then
      ShellExecuteContextCommand(ParentForm.Handle, shcProperties, PathName)
    else
  if (not IsRecycleBin) and (MarkedCount > 1) and ItemFocused.Selected then
  begin
    FileList := TStringList.Create;
    try
      CreateFileList(False, True, FileList);
      for Index := 0 to Pred(FileList.Count) do
        FileList[Index] := ExtractFileName(FileList[Index]);
      ShellExecuteContextCommand(ParentForm.Handle, shcProperties,
        PathName, FileList);
    finally
      FileList.Free;
    end;
  end
    else
  if Assigned(ItemFocused.Data) then
  begin
    if IsRecycleBin then
    begin
      if Assigned(PFileRec(ItemFocused.Data)^.PIDL) then
      begin
        PIDL_GetRelative(PFileRec(ItemFocused.Data)^.PIDL, PIDLPath, PIDLRel);
        ShellExecuteContextCommand(ParentForm.Handle, shcProperties, iRecycleFolder, 1, PIDLRel);
        FreePIDL(PIDLRel);
        FreePIDL(PIDLPath);
      end;
    end
      else
    ShellExecuteContextCommand(ParentForm.Handle, shcProperties,
      ItemFullFileName(ItemFocused));
  end;
end;

procedure TDirView.ExecuteFile(Item: TListItem);
var
  DefDir: string;
  FileName: string;
begin
  if (UpperCase(PFileRec(Item.Data)^.FileExt) = 'LNK') or
     PFileRec(Item.Data)^.IsDirectory then
  begin
    if PFileRec(Item.Data)^.IsDirectory then
    begin
      FileName := ItemFullFileName(Item);
      if not DirectoryExistsFix(FileName) then
      begin
        Reload2;
        if Assigned(FDriveView) and Assigned(FDriveView.Selected) then
          with FDriveView do
            ValidateDirectory(Selected);
        Exit;
      end;
    end
      else
    FileName := ResolveFileShortCut(ItemFullFileName(Item), True);

    if DirectoryExistsFix(FileName) then
    begin
      Path := FileName;
      Exit;
    end
      else
    if not FileExistsFix(ApiPath(FileName)) then
    begin
      Exit;
    end;
  end;

  GetDir(0, DefDir);
  ChDir(PathName);

  try
    ShellExecuteContextCommand(ParentForm.Handle, shcDefault,
      ItemFullFileName(Item));
  finally
    ChDir(DefDir);
  end;
end;

procedure TDirView.ExecuteDrive(Drive: string);
var
  APath: string;
  DriveRoot: string;
begin
  if Assigned(FLastPath) and FLastPath.ContainsKey(Drive) then
  begin
    APath := FLastPath[Drive];
    if not DirectoryExists(ApiPath(APath)) then
    begin
      if DriveInfo.IsRealDrive(Drive) then
        APath := Format('%s:', [Drive])
      else
        APath := Drive;
    end;
  end
    else
  begin
    if DriveInfo.IsRealDrive(Drive) then
    begin
      GetDir(Integer(Drive[1]) - Integer('A') + 1, APath);
      DriveRoot := DriveInfo.GetDriveRoot(Drive);
      // When the drive is not valid, the GetDir returns the current drive working directory, detect that,
      // and let it fail later when trying to open root of the invalid drive.
      if not StartsText(DriveRoot, APath) then
        APath := DriveRoot;
      APath := ExcludeTrailingPathDelimiter(APath);
    end
      else
    begin
      APath := Drive;
    end;
  end;

  if Path <> APath then
    Path := APath;
end;

procedure TDirView.ExecuteHomeDirectory;
begin
  Path := HomeDirectory;
end;

procedure TDirView.ExecuteParentDirectory;
begin
  if Valid then
  begin
    if Assigned(DriveView) and Assigned(DriveView.Selected) then
    begin
      DriveView.Selected := DriveView.Selected.Parent
    end
      else
    begin
      Path := ExtractFilePath(Path);
    end;
  end;
end;

procedure TDirView.ExecuteRootDirectory;
begin
  if Valid then
  begin
    FNotRelative := True;
    try
      Path := ExtractFileDrive(Path);
    finally
      FNotRelative := False;
    end;
  end;
end;

procedure TDirView.Delete(Item: TListItem);
begin
  if Assigned(Item) and Assigned(Item.Data) and not (csRecreating in ControlState) then
    with PFileRec(Item.Data)^ do
    begin
      SetLength(FileName, 0);
      SetLength(TypeName, 0);
      SetLength(DisplayName, 0);
      if Assigned(PIDL) then FreePIDL(PIDL);
      FreeAndNil(Thumbnail);
      Dispose(PFileRec(Item.Data));
      Item.Data := nil;
    end;
  inherited Delete(Item);
end; {Delete}

procedure TDirView.InternalEdit(const HItem: TLVItem);
var
  Item: TListItem;
  Info: string;
  NewCaption: string;
  IsDirectory: Boolean;
begin
  Item := GetItemFromHItem(HItem);
  IsDirectory := DirectoryExists(ItemFullFileName(Item));
  NewCaption := HItem.pszText;

  StopWatchThread;
  if IsDirectory and Assigned(FDriveView) then
    TDriveView(FDriveView).StopWatchThread;

  with FFileOperator do
  begin
    Flags := FileOperatorDefaultFlags + [foNoConfirmation];
    Operation := foRename;
    OperandFrom.Clear;
    OperandTo.Clear;
    OperandFrom.Add(ItemFullFileName(Item));
    OperandTo.Add(FPath + '\' + HItem.pszText);
  end;

  try
    if FFileOperator.Execute then
    begin
      if IsDirectory and Assigned(FDriveView) then
        with FDriveView do
          if Assigned(Selected) then
            ValidateDirectory(Selected);

      with GetFileRec(Item.Index)^ do
      begin
        Empty := True;
        IconEmpty := True;
        FileName := NewCaption;
        DisplayName := FileName;
        FileExt := UpperCase(ExtractFileExt(HItem.pszText));
        FileExt := Copy(FileExt, 2, Length(FileExt) - 1);
        TypeName := EmptyStr;
        if Assigned(PIDL) then
          FreePIDL(PIDL);
      end;
      GetDisplayData(Item, True);
      ResetItemImage(Item.Index);
      UpdateItems(Item.Index, Item.Index);
      if Assigned(OnEdited) then OnEdited(Self, Item, NewCaption);
      if Item <> nil then Item.Caption := NewCaption;
      SortItems;
      if Assigned(ItemFocused) then ItemFocused.MakeVisible(False);
    end
      else
    begin
      Item.Caption := GetFileRec(Item.Index)^.FileName;
      Item.Update;

      if FileOrDirExists(IncludeTrailingPathDelimiter(FPath) + HItem.pszText) then
        Info := SErrorRenameFileExists + HItem.pszText
      else
        Info := SErrorRenameFile + HItem.pszText;

      MessageBeep(MB_ICONHAND);
      if MessageDlg(FormatLastOSError(Info), mtError, [mbOK, mbAbort], 0) = mrOK then
        RetryRename(HItem.pszText);
    end;
  finally
    Sleep(0);
    LoadEnabled := True;
    if FWatchForChanges and (not WatchThreadActive) then
      StartWatchThread;
    if Assigned(FDriveView) then
      TDriveView(FDriveView).StartWatchThread;
  end;
end;

function TDirView.ItemFileName(Item: TListItem): string;
begin
  if Assigned(Item) and Assigned(Item.Data) then
    Result := ExtractFileName(PFileRec(Item.Data)^.FileName)
  else
    Result := '';
end;

function TDirView.ItemFileSize(Item: TListItem): Int64;
begin
  Result := 0;
  if Assigned(Item) and Assigned(Item.Data) then
    Result := GetItemFileSize(PFileRec(Item.Data));
end;

function TDirView.ItemFileTime(Item: TListItem;
  var Precision: TDateTimePrecision): TDateTime;
begin
  Result := FileTimeToDateTime(PFileRec(Item.Data)^.FileTime);
  Precision := tpMillisecond;
end;

function TDirView.ItemImageIndex(Item: TListItem;
  Cache: Boolean): Integer;
begin
  if Assigned(Item) and Assigned(Item.Data) then
  begin
    if PFileRec(Item.Data)^.IconEmpty then
    begin
      if Cache then Result := -1
        else Result := UnknownFileIcon;
    end
      else
    begin
      if (not Cache) or MatchesFileExt(PFileRec(Item.Data)^.FileExt, SpecialExtensions) then
        Result := PFileRec(Item.Data)^.ImageIndex
      else
        Result := -1
    end;
  end
    else Result := -1;
end;

procedure TDirView.Notification(AComponent: TComponent; Operation: TOperation);
begin
  inherited Notification(AComponent, Operation);
  if (Operation = opRemove) and (AComponent = FDriveView) then
    FDriveView := nil;
end; {Notification}

procedure TDirView.ReloadDirectory;
begin
  Reload(True);
end;

procedure TDirView.ResetItemImage(Index: Integer);
var
  LVI: TLVItem;
begin
  with PFileRec(Items[Index].Data)^, LVI do
  begin
    {Update imageindex:}
    Mask := LVIF_STATE or LVIF_DI_SETITEM or LVIF_IMAGE;
    iItem := Index;
    iSubItem := 0;
    if ListView_GetItem(Handle, LVI) then
    begin
      iImage := I_IMAGECALLBACK;
      Mask := Mask and (not LVIF_DI_SETITEM);
      ListView_SetItem(Handle, LVI);
    end;
  end; {With}
end; {ResetItemImage}

{ Drag&Drop handling }

procedure TDirView.SignalFileDelete(Sender: TObject; Files: TStringList);
{Called by TFileDeleteThread, when a file was deleted by the Drag&Drop target window:}
var
  Index: Integer;
begin
  if Files.Count > 0 then
    for Index := 0 to Files.Count - 1 do
      ValidateFile(Files[Index]);
end;

procedure TDirView.DDMenuPopup(Sender: TObject; AMenu: HMenu; DataObj: IDataObject;
  AMinCustCmd: Integer; grfKeyState: Longint; pt: TPoint);
begin
  if Assigned(FDriveView) then
  begin
    // When a change is detected while menu is popped up
    // it loses focus (or something similar)
    // preventing it from handling subsequent click.
    // This typically happens when right-dragging from remote to local panel,
    // what causes temp directory being created+deleted.
    // This is HACK, we should implement some uniform watch disabling/enabling
    TDriveView(FDriveView).SuspendChangeTimer;
  end;

  inherited;
end;

procedure TDirView.DDMenuDone(Sender: TObject; AMenu: HMenu);
begin
  if not WatchThreadActive then
  begin
    FChangeTimer.Interval := Min(FChangeInterval * 2, 3000);
    FChangeTimer.Enabled  := True;
  end;

  if Assigned(FDriveView) then
  begin
    TDriveView(FDriveView).ResumeChangeTimer;
  end;

  inherited;
end;

procedure TDirView.DDDropHandlerSucceeded(Sender: TObject; grfKeyState: Longint;
  Point: TPoint; dwEffect: Longint);
begin
  // Not sure why is this here. There's no "disable" counterparty.
  if not WatchThreadActive then
  begin
    FChangeTimer.Interval := FChangeInterval;
    FChangeTimer.Enabled  := True;
  end;

  inherited;
end;

procedure TDirView.AddToDragFileList(FileList: TFileList; Item: TListItem);
begin
  Assert(Assigned(Item));
  if IsRecycleBin then
  begin
    if Assigned(Item.Data) then
    begin
      if UpperCase(ExtractFileExt(PFileRec(Item.Data)^.DisplayName)) =
        ('.' + PFileRec(Item.Data)^.FileExt) then
          FileList.AddItemEx(PFileRec(Item.Data)^.PIDL,
            ItemFullFileName(Item), PFileRec(Item.Data)^.DisplayName)
      else
        FileList.AddItemEx(PFileRec(Item.Data)^.PIDL,
          ItemFullFileName(Item), PFileRec(Item.Data)^.DisplayName +
            ExtractFileExt(PFileRec(Item.Data)^.FileName));
    end;
  end
    else inherited;
end;

procedure TDirView.DDDragDetect(grfKeyState: Longint; DetectStart, Point: TPoint;
  DragStatus: TDragDetectStatus);
var
  WasWatchThreadActive: Boolean;
begin
  if (DragStatus = ddsDrag) and (MarkedCount > 0) then
  begin
    WasWatchThreadActive := WatchThreadActive;
    inherited;

    if (LastDDResult = drMove) and (not WasWatchThreadActive) then
      StartFileDeleteThread;
  end;
end; {DDDragDetect}

procedure TDirView.DDChooseEffect(grfKeyState: Integer; var dwEffect: Integer; PreferredEffect: Integer);
begin
  if DragDropFilesEx.OwnerIsSource and
     (dwEffect = DROPEFFECT_COPY) and (not Assigned(DropTarget)) then
  begin
    dwEffect := DROPEFFECT_NONE
  end
    else
  if (grfKeyState and (MK_CONTROL or MK_SHIFT) = 0) and (PreferredEffect = 0) then
  begin
    if FDragDrive <> '' then
    begin
      if ExeDrag and DriveInfo.IsFixedDrive(DriveInfo.GetDriveKey(Path)) and DriveInfo.IsFixedDrive(FDragDrive) then
      begin
        dwEffect := DROPEFFECT_LINK;
      end
        else
      begin
        if DragOnDriveIsMove and
           (not DDOwnerIsSource or Assigned(DropTarget)) and
           ((SameText(FDragDrive, DriveInfo.GetDriveKey(Path)) and (dwEffect = DROPEFFECT_COPY) and
           (DragDropFilesEx.AvailableDropEffects and DROPEFFECT_MOVE <> 0))
             or IsRecycleBin) then
        begin
          dwEffect := DROPEFFECT_MOVE;
        end;
      end;
    end;
  end;

  inherited;
end;

procedure TDirView.PerformDragDropFileOperation(TargetPath: string;
  Effect: Integer; RenameOnCollision: Boolean; Paste: Boolean);
var
  Index: Integer;
  SourcePath: string;
  OldCursor: TCursor;
  OldWatchForChanges: Boolean;
  IsRecycleBin: Boolean;
  SourceIsDirectory: Boolean;
  Node: TTreeNode;
begin
  if DragDropFilesEx.FileList.Count > 0 then
  begin
    if not DirectoryExists(TargetPath) then
    begin
      Reload(True);
      DDError(DDPathNotFoundError);
    end
      else
    begin
      IsRecycleBin := Self.IsRecycleBin or
        ((DropTarget <> nil) and ItemIsRecycleBin(DropTarget));
      if not (DragDropFilesEx.FileNamesAreMapped and IsRecycleBin) then
      begin
        OldCursor := Screen.Cursor;
        OldWatchForChanges := WatchForChanges;
        SourceIsDirectory := True;
        SourcePath := EmptyStr;

        try
          Screen.Cursor := crHourGlass;
          WatchForChanges := False;

          if Effect in [DROPEFFECT_COPY, DROPEFFECT_MOVE] then
          begin
            StopWatchThread;

            if Assigned(DriveView) then
              TDriveView(DriveView).StopWatchThread;

            if (DropSourceControl <> Self) and
               (DropSourceControl is TDirView) then
                TDirView(DropSourceControl).StopWatchThread;

            if DropFiles(
                 DragDropFilesEx, Effect, FFileOperator, TargetPath, RenameOnCollision, IsRecycleBin,
                 ConfirmDelete, ConfirmOverwrite, Paste,
                 Self, OnDDFileOperation, SourcePath, SourceIsDirectory) then
            begin
              ReLoad2;
              if Assigned(OnDDFileOperationExecuted) then
                OnDDFileOperationExecuted(Self, Effect, SourcePath, TargetPath);
            end;
          end
            else
          if Effect = DROPEFFECT_LINK then
          (* Create Link requested: *)
          begin
            StopWatchThread;
            for Index := 0 to DragDropFilesEx.FileList.Count - 1 do
            begin
              if not DropLink(PFDDListItem(DragDropFilesEx.FileList[Index]), TargetPath) then
              begin
                DDError(DDCreateShortCutError);
              end;
            end;
            ReLoad2;
          end;

          if Assigned(DropSourceControl) and
             (DropSourceControl is TDirView) and
             (DropSourceControl <> Self) and
             (Effect = DROPEFFECT_MOVE) then
          begin
            TDirView(DropSourceControl).ValidateSelectedFiles;
          end;

          if Assigned(FDriveView) and SourceIsDirectory then
          begin
            with TDriveView(FDriveView) do
            begin
              try
                ValidateDirectory(FindNodeToPath(TargetPath));
              except
              end;

              if (Effect = DROPEFFECT_MOVE) or IsRecycleBin then
              try
                Node := TryFindNodeToPath(SourcePath);
                // If the path is not even in the tree, do not bother.
                // This is particularly for dragging from remote folder, when the source path in %TEMP% and
                // calling ValidateDirectory would load whole TEMP (and typically also "C:\Users")
                if Assigned(Node) then
                begin
                  if Assigned(Node.Parent) then
                    Node := Node.Parent;
                  ValidateDirectory(Node);
                end;
              except
              end;
            end;
          end;
        finally
          FFileOperator.OperandFrom.Clear;
          FFileOperator.OperandTo.Clear;
          if Assigned(FDriveView) then
            TDriveView(FDriveView).StartWatchThread;
          Sleep(0);
          WatchForChanges := OldWatchForChanges;
          if (DropSourceControl <> Self) and (DropSourceControl is TDirView) then
            TDirView(DropSourceControl).StartWatchThread;
          Screen.Cursor := OldCursor;
        end;
      end;
    end;
  end;
end; {PerformDragDropFileOperation}

procedure TDirView.DDError(ErrorNo: TDDError);
begin
  if Assigned(OnDDError) then OnDDError(Self, ErrorNo)
    else
  raise EDragDrop.Create(Format(SDragDropError, [Ord(ErrorNo)]));
end; {DDError}

function TDirView.GetCanUndoCopyMove: Boolean;
begin
  Result := Assigned(FFileOperator) and FFileOperator.CanUndo;
end; {CanUndoCopyMove}

function TDirView.UndoCopyMove : Boolean;
var
  LastTarget: string;
  LastSource: string;
begin
  Result := False;
  if FFileOperator.CanUndo then
  begin
    Lasttarget := FFileOperator.LastOperandTo[0];
    LastSource := FFileOperator.LastOperandFrom[0];
    if Assigned(FDriveView) then
      TDriveView(FDriveView).StopAllWatchThreads;

    Result := FFileOperator.UndoExecute;

    if not WatchthreadActive then
      Reload2;

    if Assigned(FDriveView) then
      with TDriveView(FDriveView) do
      begin
        ValidateDirectory(FindNodeToPath(ExtractFilePath(LastTarget)));
        ValidateDirectory(FindNodeToPath(ExtractFilePath(LastSource)));
        StartAllWatchThreads;
      end;
  end;
end; {UndoCopyMove}

procedure TDirView.EmptyClipboard;
var
  Item: TListItem;
begin
  if Windows.OpenClipBoard(0) then
  begin
    Windows.EmptyClipBoard;
    Windows.CloseClipBoard;
    if LastClipBoardOperation <> cboNone then
    begin
      Item := GetNextItem(nil, sdAll, [isCut]);
      while Assigned(Item) do
      begin
        Item.Cut := False;
        Item := GetNextItem(Item, sdAll, [isCut]);
      end;
    end;
    LastClipBoardOperation := cboNone;
    if Assigned(FDriveView) then
      TDriveView(FDriveView).LastPathCut := '';
  end;
end; {EmptyClipBoard}

function TDirView.DoCopyToClipboard(Focused: Boolean; Cut: Boolean; Operation: TClipBoardOperation): Boolean;
var
  Item: TListItem;
  SaveCursor: TCursor;
begin
  SaveCursor := Screen.Cursor;
  Screen.Cursor := crHourGlass;
  try
    Result := False;
    EmptyClipBoard;
    DragDropFilesEx.FileList.Clear;
    if OperateOnFocusedFile(Focused) or (SelCount > 0) then
    begin
      if OperateOnFocusedFile(Focused) then
      begin
        DragDropFilesEx.FileList.AddItem(nil, ItemFullFileName(ItemFocused));
      end
        else
      begin
        Item := GetNextItem(nil, sdAll, [isSelected]);
        while Assigned(Item) do
        begin
          DragDropFilesEx.FileList.AddItem(nil, ItemFullFileName(Item));
          Item.Cut := Cut;
          Item := GetNextItem(Item, sdAll, [isSelected]);
        end;
      end;

      Result := DragDropFilesEx.CopyToClipBoard;
      LastClipBoardOperation := Operation;
    end;
  finally
    Screen.Cursor := SaveCursor;
  end;
end; {DoCopyToClipBoard}

function TDirView.CopyToClipBoard(Focused: Boolean): Boolean;
begin
  Result := DoCopyToClipboard(Focused, False, cboCopy);
end;

function TDirView.CutToClipBoard(Focused: Boolean): Boolean;
begin
  Result := DoCopyToClipboard(Focused, True, cboCut);
end;

function TDirView.PasteFromClipBoard(TargetPath: string): Boolean;
begin
  DragDropFilesEx.FileList.Clear;
  Result := False;
  if CanPasteFromClipBoard and {MP}DragDropFilesEx.GetFromClipBoard{/MP}
    then
  begin
    if TargetPath = '' then
      TargetPath := PathName;
    case LastClipBoardOperation of
      cboNone:
        begin
          PerformDragDropFileOperation(TargetPath, DROPEFFECT_COPY, False, True);
          if Assigned(OnDDExecuted) then OnDDExecuted(Self, DROPEFFECT_COPY);
        end;
      cboCopy:
        begin
          PerformDragDropFileOperation(TargetPath, DROPEFFECT_COPY,
            ExcludeTrailingPathDelimiter(ExtractFilePath(TFDDListItem(DragDropFilesEx.FileList[0]^).Name)) = Path, True);
          if Assigned(OnDDExecuted) then OnDDExecuted(Self, DROPEFFECT_COPY);
        end;
      cboCut:
        begin
          PerformDragDropFileOperation(TargetPath, DROPEFFECT_MOVE, False, True);
          if Assigned(OnDDExecuted) then OnDDExecuted(Self, DROPEFFECT_MOVE);
          EmptyClipBoard;
        end;
    end;
    Result := True;
  end;
end; {PasteFromClipBoard}

function TDirView.DragCompleteFileList: Boolean;
begin
  Result := inherited DragCompleteFileList and
    (FDriveType <> DRIVE_REMOVABLE);
end;

function TDirView.DuplicateSelectedFiles: Boolean;
begin
  Result := False;
  if SelCount > 0 then
  begin
    Result := CopyToClipBoard(False);
    if Result then
      try
        SelectNewFiles := True;
        Selected := nil;
        Result := PasteFromClipBoard();
      finally
        SelectNewFiles := False;
        if Assigned(Selected) then
        begin
          ItemFocused := Selected;
          Selected.MakeVisible(False);
          if SelCount = 1 then
            Selected.EditCaption;
        end;
      end;

  end;
  EmptyClipBoard;
end; {DuplicateFiles}

function TDirView.NewColProperties: TCustomListViewColProperties;
begin
  Result := TDirViewColProperties.Create(Self);
end;

function TDirView.SortAscendingByDefault(Index: Integer): Boolean;
begin
  Result := not (TDirViewCol(Index) in [dvSize, dvChanged]);
end;

procedure TDirView.SetItemImageIndex(Item: TListItem; Index: Integer);
begin
  Assert(Assigned(Item));
  if Assigned(Item.Data) then
    with PFileRec(Item.Data)^ do
    begin
      ImageIndex := Index;
      IconEmpty := (ImageIndex < 0);
    end;
end;

procedure TDirView.SetItemCalculatedSize(Item: TListItem; ASize: Int64);
var
  OldSize: Int64;
begin
  Assert(Assigned(Item) and Assigned(Item.Data));
  with PFileRec(Item.Data)^ do
  begin
    OldSize := CalculatedSize;
    CalculatedSize := ASize;
  end;
  ItemCalculatedSizeUpdated(Item, OldSize, ASize);
end;

{=================================================================}

initialization
  LastClipBoardOperation := cboNone;
  DaylightHack := (not IsWin7);
end.