path: root/src/gui/gui_grid.pas

{
    fpGUI  -  Free Pascal GUI Library

    Copyright (C) 2006 - 2007 See the file AUTHORS.txt, included in this
    distribution, for details of the copyright.

    See the file COPYING.modifiedLGPL, included in this distribution,
    for details about redistributing fpGUI.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    Description:
      Defines a File Grid and String Grid. Both are decendants of Custom Grid.
}

unit gui_grid;

{$mode objfpc}{$H+}

{
  TODO:
    * TCustomStringGrid: Objects property needs to be implemented.
    * TCustomStringGrid: Col[] and Row[] properties need to be implemented.
       The return TStrings with all text inserted.gui_grid
}

interface

uses
  Classes,
  SysUtils,
  gfxbase,
  fpgfx,
  gui_basegrid,
  gui_customgrid;
  
type
{
  TfpgGrid = class(TfpgCustomGrid)
  public
    property    Font;
    property    HeaderFont;
  published
    property    Columns;
    property    DefaultColWidth;
    property    DefaultRowHeight;
    property    FontDesc;
    property    HeaderFontDesc;
    property    BackgroundColor;
    property    FocusCol;
    property    FocusRow;
    property    RowSelect;
    property    ColumnCount;
    property    RowCount;
    property    ShowHeader;
    property    ShowGrid;
    property    HeaderHeight;
    property    ColResizing;
    property    ColumnWidth;
    property    OnFocusChange;
    property    OnRowChange;
    property    OnDoubleClick;
  end;
}

  //*****************  Move these to CoreLib  ********************
  TFileEntryType = (etFile, etDir);
  TFileListSortOrder = (soNone, soFileName, soCSFileName, soFileExt, soSize, soTime);

  // A simple data object
  TFileEntry = class(TObject)
  private
    FAttributes: longword;
    FEntryType: TFileEntryType;
    FExtention: string;
    FGroupID: integer;
    FIsLink: boolean;
    FLinkTarget: string;
    FMode: longword;
    FModTime: TDateTime;
    FName: string;
    FOwnerID: integer;
    FSize: int64;
  public
    constructor Create;
    property    Name: string read FName write FName;
    property    Extention: string read FExtention write FExtention;
    property    Size: int64 read FSize write FSize;
    property    EntryType: TFileEntryType read FEntryType write FEntryType;
    property    IsLink: boolean read FIsLink write FIsLink;
    property    Attributes: longword read FAttributes write FAttributes;
    property    Mode: longword read FMode write FMode;  // only used by unix OS's
    property    ModTime: TDateTime read FModTime write FModTime;
    property    OwnerID: integer read FOwnerID write FOwnerID;
    property    GroupID: integer read FGroupID write FGroupID;
    property    LinkTarget: string read FLinkTarget write FLinkTarget;
  end;


  TFileList = class(TObject)
  private
    FEntries: TList;
    FDirectoryName: string;
    function    GetEntry(i: integer): TFileEntry;
  public
    constructor Create;
    destructor  Destroy; override;
    function    Count: integer;
    function    ReadDirectory(const AFilemask: string; AShowHidden: boolean): integer;
    procedure   Clear;
    procedure   Sort(AOrder: TFileListSortOrder);
    property    Entry[i: integer]: TFileEntry read GetEntry;
    property    DirectoryName: string read FDirectoryName;
  end;
  
  
  TfpgFileGrid = class(TfpgCustomGrid)
  private
    FFileList: TFileList;
    FFixedFont: TfpgFont;
  protected
    function    GetRowCount: integer; override;
    procedure   DrawCell(ARow, ACol: integer; ARect: TfpgRect; AFlags: integer); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor  Destroy; override;
    function    CurrentEntry: TFileEntry;
    property    FixedFont: TfpgFont read FFixedFont;
    property    FileList: TFileList read FFileList;
    property    DefaultRowHeight;
    property    Font;
    property    HeaderFont;
  published
    property    FontDesc;
    property    HeaderFontDesc;
    property    RowCount;
    property    ColumnCount;
    property    Columns;
    property    FocusRow;
    property    ScrollBarStyle;
    property    OnRowChange;
    property    OnDoubleClick;
  end;


  TfpgStringColumn = class(TfpgGridColumn)
  private
    FCells: TStringList;
  public
	  constructor Create; override;
	  destructor  Destroy; override;
    property    Cells: TStringList read FCells write FCells;
  end;


  TfpgCustomStringGrid = class(TfpgCustomGrid)
  private
    function    GetCell(ACol, ARow: LongWord): string;
    function    GetColumnTitle(ACol: integer): string;
    function    GetObjects(ACol, ARow: LongWord): TObject;
    procedure   SetCell(ACol, ARow: LongWord; const AValue: string);
    procedure   SetColumnTitle(ACol: integer; const AValue: string);
    procedure   SetObjects(ACol, ARow: LongWord; const AValue: TObject);
  protected
    function    GetColumnWidth(ACol: integer): integer; override;
    procedure   SetColumnWidth(ACol: integer; const AValue: integer); override;
    function    GetColumns(AIndex: integer): TfpgStringColumn; reintroduce;
    procedure   DoDeleteColumn(ACol: integer); override;
    procedure   DoSetRowCount(AValue: integer); override;
    function    DoCreateColumnClass: TfpgStringColumn; reintroduce; override;
    procedure   DrawCell(ARow, ACol: integer; ARect: TfpgRect; AFlags: integer); override;
    { AIndex is 1-based. }
    property    Columns[AIndex: integer]: TfpgStringColumn read GetColumns;
  public
    constructor Create(AOwner: TComponent); override;
    function    AddColumn(ATitle: string; AWidth: integer; AAlignment: TAlignment = taLeftJustify): TfpgStringColumn; overload;
    { ACol and ARow is 1-based. }
    property    Cells[ACol, ARow: LongWord]: string read GetCell write SetCell;
    property    Objects[ACol, ARow: LongWord]: TObject read GetObjects write SetObjects;
    property    ColumnTitle[ACol: integer]: string read GetColumnTitle write SetColumnTitle;
    property    ColumnWidth[ACol: integer]: integer read GetColumnWidth write SetColumnWidth;
//    property    Cols[index: Integer]: TStrings read GetCols write SetCols;
//    property    Rows[index: Integer]: TStrings read GetRows write SetRows;
  end;


  TfpgStringGrid = class(TfpgCustomStringGrid)
  published
    property    Columns;
    property    DefaultColWidth;
    property    DefaultRowHeight;
    property    FontDesc;
    property    HeaderFontDesc;
    property    BackgroundColor;
    property    FocusCol;
    property    FocusRow;
    property    RowSelect;
    property    ColumnCount;
    property    RowCount;
    property    ScrollBarStyle;
    property    ShowHeader;
    property    ShowGrid;
    property    HeaderHeight;
    property    ColResizing;
    property    ColumnWidth;
    property    OnFocusChange;
    property    OnRowChange;
    property    OnDoubleClick;
  end;
  

implementation

uses
  gfx_utils
  {$IFDEF MSWINDOWS}
  ,Windows   // Graeme: temporary, just to see how the grid looks under Windows.
  {$ENDIF}
  {$IFDEF UNIX}
  ,libc      // Graeme: temporary
  ,baseunix
  {$ENDIF}
  ;
  

// *****  These two functions will be moving out of this unit soon!
  
function StringMatches(const astr, apat: string): boolean;
var
  pati, si: longint;
begin
  result := True;
  pati := 1;
  si := 1;
  while result and (si <= length(astr)) and (pati <= length(apat)) do
  begin
    if (apat[pati] = '?') or (apat[pati] = astr[si]) then
    begin
      inc(si);
      inc(pati);
    end
    else if (apat[pati] = '*') then
    begin
      while (pati <= length(apat)) and (apat[pati] in ['?','*']) do
        inc(pati);
      if pati > length(apat) then
      begin
        si := length(astr)+1;
        Break;   // * at the end
      end;

      while (si <= length(astr)) and (astr[si] <> apat[pati]) do
        inc(si);
      if si > length(astr) then
        result := False;
    end
    else
    begin
      result := False;
    end;
  end;

  result := result and (si > length(astr));
end;

// multiple patterns separated with ;
function FileNameMatches(const astr, apats: string): boolean;
var
  cpat: string;
  p: integer;
  s: string;
  astrupper: string;
begin
  astrupper := UpperCase(astr);
  result := False;
  s := apats;
  repeat
    cpat := '';
    p := pos(';',s);
    if p > 0 then
    begin
      cpat := copy(s, 1, p-1);
      delete(s, 1, p);
    end
    else
    begin
      cpat := s;
      s := '';
    end;  { if/else }
    cpat := UpperCase(trim(cpat));
    if cpat <> '' then
      result := StringMatches(astrupper, cpat);
  until result or (cpat = '');
end;

{$IFDEF UNIX}
function GetGroupName(gid: integer): string;
var
  p: PGroup;
begin
  p := getgrgid(gid);
  if p <> nil then
    result := p^.gr_name;
end;

function GetUserName(uid: integer): string;
var
  p: PPasswd;
begin
  p := getpwuid(uid);
  if p <> nil then
    result := p^.pw_name
  else
    result := '';
end;
{$ENDIF}


{ TFileEntry }

constructor TFileEntry.Create;
begin
  FAttributes := 0;
  FMode := 0;
  FSize := 0;
  FIsLink := False;
  FEntryType := etFile;
end;

{ TFileList }

function TFileList.GetEntry(i: integer): TFileEntry;
begin
  if (i < 1) or (i > FEntries.Count) then
    Result := nil
  else
    Result := TFileEntry(FEntries[i-1]);
end;

constructor TFileList.Create;
begin
  FEntries := TList.Create;
  FDirectoryName := '';
end;

destructor TFileList.Destroy;
begin
  Clear;
  FEntries.Free;
  inherited Destroy;
end;

function TFileList.Count: integer;
begin
  Result := FEntries.Count;
end;

function TFileList.ReadDirectory(const AFilemask: string; AShowHidden: boolean): integer;

  { HasAttrib() tests whether or not a file (with attributes fileAttrib) has the
    testAttrib attribute bit set. }
  function HasAttrib(fileAttrib, testAttrib: Integer): Boolean;
  begin
    Result := (fileAttrib and testAttrib) <> 0;
  end;

  // locally visible proc
  procedure AddEntry(sr: TSearchRec);
  var
    e: TFileEntry;
    fullname: string;
    {$IFDEF UNIX}
    info: Tstat;
    {$ENDIF}
  begin
    e := TFileEntry.Create;
    e.Name        := sr.Name;
    e.Extention   := ExtractFileExt(e.Name);
    e.Size        := sr.Size;
    e.Attributes  := sr.Attr; // this is incorrect and needs to improve!
    e.EntryType   := etFile;
    fullname      := FDirectoryName + e.Name;
    {$IFDEF UNIX}
    e.mode        := sr.Mode;
    Fpstat(PChar(fullname), info);
    e.GroupID     := info.st_gid;
    e.OwnerID     := info.st_uid;
    {$ENDIF}
    e.IsLink      := FileIsSymlink(fullname);
    e.LinkTarget  := ExtractTargetSymLinkPath(fullname);
    e.ModTime     := FileDateToDateTime(sr.Time);

    if HasAttrib(sr.Attr, faDirectory) then
      e.EntryType := etDir
    else
      e.EntryType := etFile;

    if (e.Name = '.') or
       ((e.Name = '..') and (FDirectoryName = '/')) or
       (not AShowHidden and (Copy(e.Name, 1, 1) = '.') and (Copy(e.Name, 2, 1) <> '.')) or
//       (not AShowHidden and HasAttrib(sr.Attr, faHidden)) or
       ((e.EntryType = etFile) and not FileNameMatches(e.Name, AFilemask)) then
    begin
      // do not add this entry
      e.Free;
    end
    else
      FEntries.Add(e)
  end;

var
  SearchRec: TSearchRec;
begin
  Clear;
  GetDir(0, FDirectoryName);

  // Add PathDelim to end if it doesn't yet exist
  if Copy(FDirectoryName, Length(FDirectoryName), 1) <> PathDelim then
    FDirectoryName := FDirectoryName + PathDelim;

  try
    // The extra 'or' includes Normal attribute files under Windows. faAnyFile doesn't return those.
    // Reported to FPC as bug 9440 in Mantis.
    if SysUtils.FindFirst(FDirectoryName + '*', faAnyFile or $00000080, SearchRec) = 0 then
    begin
      AddEntry(SearchRec);
      while SysUtils.FindNext(SearchRec) = 0 do
      begin
        AddEntry(SearchRec);
      end;
    end;
  finally
    SysUtils.FindClose(SearchRec);
  end;

  Result := FEntries.Count;
end;

procedure TFileList.Clear;
var
  n: integer;
begin
  for n := 0 to FEntries.Count-1 do
    TFileEntry(FEntries[n]).Free;
  FEntries.Clear;
end;

procedure TFileList.Sort(AOrder: TFileListSortOrder);
var
  newl: TList;
  n: integer;
  i: integer;
  e: TFileEntry;

  function IsBefore(newitem, item: TFileEntry): boolean;
  begin
    //if newitem.etype = etDir then writeln('dir: ',newitem.name,' (',item.name,')');
    if (newitem.EntryType = etDir) and (item.EntryType <> etDir) then
    begin
      result := true;
    end
    else if (newitem.EntryType <> etDir) and (item.EntryType = etDir) then
    begin
      result := false;
    end
    else if (newitem.EntryType = etDir) and (newitem.Name = '..') then
    begin
      result := true;
    end
    else if (item.EntryType = etDir) and (item.Name = '..') then
    begin
      result := false;
    end
    else
      case AOrder of
        soFileName   : result := UpperCase(newitem.Name) < UpperCase(item.Name);
        soCSFileName : result := newitem.Name < item.Name;
        soFileExt    : result := UpperCase(newitem.Extention+' '+newitem.Name) < UpperCase(item.Extention+' '+item.Name);
        soSize       : result := newitem.size < item.size;
        soTime       : result := newitem.modtime < item.modtime;
      else
        result := False;
      end;
  end;

begin
  newl := TList.Create;
  for n := 0 to FEntries.Count-1 do
  begin
    e := TFileEntry(FEntries[n]);
    i := 0;
    while (i < newl.Count) and not IsBefore(e,TFileEntry(newl[i])) do inc(i);
    newl.Insert(i,e);
  end;
  FEntries.Free;
  FEntries := newl;
end;

{ TfpgFileGrid }

function TfpgFileGrid.GetRowCount: integer;
begin
  Result := FFileList.Count;
end;

procedure TfpgFileGrid.DrawCell(ARow, ACol: integer; ARect: TfpgRect; AFlags: integer);
const
  modestring: string[9] = 'xwrxwrxwr';  // must be in reverse order
var
  e: TFileEntry;
  x: integer;
  y: integer;
  s: string;
  img: TfpgImage;
  b: integer;
  n: integer;
begin
  e := FFileList.Entry[ARow];
  if e = nil then
    Exit; //==>

  x := ARect.Left + 2;
  y := ARect.Top;// + 1;
  s := '';

  if (e.EntryType = etDir) and (ACol = 1) then
    Canvas.SetFont(HeaderFont)
  else
    Canvas.SetFont(Font);

  case ACol of
    1:  begin
          if e.EntryType = etDir then
            img := fpgImages.GetImage('stdimg.folder')
          else
          begin
            img := fpgImages.GetImage('stdimg.document');
            {$IFDEF UNIX}
           if (e.Mode and $40) <> 0 then
              img := fpgImages.GetImage('stdimg.executable');
            {$ENDIF}
           {$IFDEF MSWINDOWS}
           if lowercase(e.Extention) = 'exe' then
              img := fpgImages.GetImage('stdimg.executable');
           {$ENDIF}
          end;

          if img <> nil then
            Canvas.DrawImage(ARect.Left+1, y, img);
          if e.IsLink then
            Canvas.DrawImage(ARect.Left+1, y, fpgImages.GetImage('stdimg.link'));
          x := ARect.Left + 20;
          s := e.Name;
        end;
        
    2:  begin
          s := FormatFloat('###,###,###,##0', e.size);
          x := ARect.Right - Font.TextWidth(s) - 1;
          if x < (ARect.Left + 2) then
            x := ARect.Left + 2;
        end;

    3:  s := FormatDateTime('yyyy-mm-dd hh:nn', e.ModTime);

    4:  begin
          {$IFDEF MSWINDOWS}
          // File attributes
          s := '';
          //if (e.attributes and FILE_ATTRIBUTE_ARCHIVE) <> 0    then s := s + 'a' else s := s + ' ';
          if (e.attributes and FILE_ATTRIBUTE_HIDDEN) <> 0     then s := s + 'h';
          if (e.attributes and FILE_ATTRIBUTE_READONLY) <> 0   then s := s + 'r';
          if (e.attributes and FILE_ATTRIBUTE_SYSTEM) <> 0     then s := s + 's';
          if (e.attributes and FILE_ATTRIBUTE_TEMPORARY) <> 0  then s := s + 't';
          if (e.attributes and FILE_ATTRIBUTE_COMPRESSED) <> 0 then s := s + 'c';
          {$ENDIF}
          {$IFDEF UNIX}
          // rights
          //rwx rwx rwx
          b := 1;
          n := 1;
          s := '';
          while n <= 9 do
          begin
            if (e.Mode and b) = 0 then
              s := '-' + s
            else
              s := modestring[n] + s;
            inc(n);
            b := b shl 1;
          end;
          {$ENDIF}

          Canvas.SetFont(FixedFont);
        end;

    {$IFDEF UNIX}
    5:  s := GetUserName(e.ownerid);  // use getpwuid(); for the name of this user
    {$ENDIF}

    {$IFDEF UNIX}
    6:  s := GetGroupName(e.groupid);  // use getgrgid(); for the name of this group
    {$ENDIF}
  end;
  // centre text in row height
  y := y + ((DefaultRowHeight - Canvas.Font.Height) div 2);
  Canvas.DrawString(x, y, s);
end;

constructor TfpgFileGrid.Create(AOwner: TComponent);
begin
  FFileList := TFileList.Create;
  inherited Create(AOwner);
  ColumnCount := 0;
  RowCount := 0;
  FFixedFont := fpgGetFont('Courier New-9');

  {$Note No IFDEF's allowed!!! But how the hell to we get around this? }
{$ifdef MSWINDOWS}
  AddColumn('Name', 320);
{$else}
  AddColumn('Name', 220);
{$endif}

  AddColumn('Size', 80);
  AddColumn('Mod. Time', 108);
{$ifdef MSWINDOWS}
  AddColumn('Attributes', 78);
{$else}
  AddColumn('Rights', 78);
  AddColumn('Owner', 54);
  AddColumn('Group', 54);
{$endif}

  RowSelect := True;
  DefaultRowHeight := fpgImages.GetImage('stdimg.document').Height + 2;
end;

destructor TfpgFileGrid.Destroy;
begin
  OnRowChange := nil;
  FFixedFont.Free;
  FFileList.Free;
  inherited Destroy;
end;

function TfpgFileGrid.CurrentEntry: TFileEntry;
begin
  Result := FFileList.Entry[FocusRow];
end;

{ TfpgStringColumn }

constructor TfpgStringColumn.Create;
begin
  inherited Create;
  FCells := TStringList.Create;
end;

destructor TfpgStringColumn.Destroy;
begin
  FCells.Free;
  inherited Destroy;
end;

{ TfpgCustomStringGrid }

function TfpgCustomStringGrid.GetCell(ACol, ARow: LongWord): string;
begin
  if ACol > ColumnCount then
    Exit; //==>
  if ARow > RowCount then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol-1]).Cells[ARow-1];
end;

function TfpgCustomStringGrid.GetColumnTitle(ACol: integer): string;
begin
  if ACol > ColumnCount then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol-1]).Title;
end;

function TfpgCustomStringGrid.GetObjects(ACol, ARow: LongWord): TObject;
begin
  if ACol > ColumnCount then
    Exit; //==>
  if ARow > RowCount then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol-1]).Cells.Objects[ARow-1];
end;

function TfpgCustomStringGrid.GetColumnWidth(ACol: integer): integer;
begin
  if ACol > ColumnCount then
    Exit; //==>
  Result := TfpgStringColumn(FColumns.Items[ACol-1]).Width;
end;

procedure TfpgCustomStringGrid.SetCell(ACol, ARow: LongWord;
  const AValue: string);
begin
  if ACol > ColumnCount then
    Exit; //==>
  if ARow > RowCount then
    Exit; //==>
  if TfpgStringColumn(FColumns.Items[ACol-1]).Cells[ARow-1] <> AValue then
  begin
    BeginUpdate;
    TfpgStringColumn(FColumns.Items[ACol-1]).Cells[ARow-1] := AValue;
    EndUpdate;
  end;
end;

procedure TfpgCustomStringGrid.SetColumnTitle(ACol: integer; const AValue: string);
begin
  if ACol > ColumnCount then
    Exit; //==>
  BeginUpdate;
  TfpgStringColumn(FColumns.Items[ACol-1]).Title := AValue;
  EndUpdate;
end;

procedure TfpgCustomStringGrid.SetObjects(ACol, ARow: LongWord;
  const AValue: TObject);
begin
  if ACol > ColumnCount then
    Exit; //==>
  if ARow > RowCount then
    Exit; //==>
  TfpgStringColumn(FColumns.Items[ACol-1]).Cells.Objects[ARow-1] := AValue;
end;

procedure TfpgCustomStringGrid.SetColumnWidth(ACol: integer; const AValue: integer);
begin
  if ACol > ColumnCount then
    Exit; //==>
  BeginUpdate;
  TfpgStringColumn(FColumns.Items[ACol-1]).Width := AValue;
  EndUpdate;
end;

function TfpgCustomStringGrid.GetColumns(AIndex: integer): TfpgStringColumn;
begin
  if (AIndex < 1) or (AIndex > ColumnCount) then
    Result := nil
  else
    Result := TfpgStringColumn(FColumns.Items[AIndex-1]);
end;

procedure TfpgCustomStringGrid.DoDeleteColumn(ACol: integer);
begin
  TfpgStringColumn(FColumns.Items[ACol-1]).Free;
  FColumns.Delete(ACol-1);
end;

procedure TfpgCustomStringGrid.DoSetRowCount(AValue: integer);
var
  diff: integer;
  c: integer;
begin
  inherited DoSetRowCount(AValue);
  if FColumns.Count = 0 then
    Exit; //==>

  diff := AValue - TfpgStringColumn(FColumns.Items[0]).Cells.Count;
  if diff > 0 then  // We need to add rows
  begin
    for c := 0 to FColumns.Count - 1 do
    begin
      while TfpgStringColumn(FColumns[c]).Cells.Count <> AValue do
        TfpgStringColumn(FColumns[c]).Cells.Append('');
    end;
  end;
end;

function TfpgCustomStringGrid.DoCreateColumnClass: TfpgStringColumn;
begin
  Result := TfpgStringColumn.Create;
end;

procedure TfpgCustomStringGrid.DrawCell(ARow, ACol: integer; ARect: TfpgRect;
  AFlags: integer);
begin
  if Cells[ACol, ARow] <> '' then
  begin
    if not Enabled then
      Canvas.SetTextColor(clShadow1);
    Canvas.DrawString(ARect.Left+1, ARect.Top+1, Cells[ACol, ARow]);
  end;
end;

constructor TfpgCustomStringGrid.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  ColumnCount := 0;
  RowCount := 0;
end;

function TfpgCustomStringGrid.AddColumn(ATitle: string; AWidth: integer;
    AAlignment: TAlignment): TfpgStringColumn;
var
  r: integer;
begin
  Include(ComponentState, csUpdating);
  Result := TfpgStringColumn(inherited AddColumn(ATitle, AWidth));
  Result.Alignment := AAlignment;
  for r := 1 to RowCount do
    Result.Cells.Append('');
  Exclude(ComponentState, csUpdating);
end;

end.