{-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------}
unit SynEditMarkup;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, Graphics, SynEditTypes, LazSynEditText, SynEditPointClasses,
  SynEditMiscClasses, Controls, SynEditHighlighter, LCLProc;

type
  TLazSynDisplayRtlInfo = record
    IsRtl: Boolean;
    PhysLeft, PhysRight: integer;  // 1-based
    LogFirst, LogLast: integer;
  end;

  TSynEditMarkupClass = class of TSynEditMarkup;

  { TSynEditMarkup }

  TSynEditMarkup = class(TObject)
  private
    FMarkupInfo : TSynSelectedColor;
    FLines : TSynEditStrings;
    FCaret : TSynEditCaret;
    FTopLine, FLinesInWindow : Integer;
    FSynEdit : TSynEditBase;
    FInvalidateLinesMethod : TInvalidateLines;
    FEnabled: Boolean;
    FTempEnable: Integer;

    function GetBGColor : TColor;
    function GetEnabled: Boolean;
    function GetFGColor : TColor;
    function GetFrameColor: TColor;
    function GetFrameStyle: TSynLineStyle;
    function GetStyle : TFontStyles;
    procedure SetBGColor(const AValue : TColor);
    procedure SetEnabled(const AValue: Boolean);
    procedure SetFGColor(const AValue : TColor);
    procedure SetFrameColor(const AValue : TColor);
    procedure SetStyle(const AValue : TFontStyles);

  protected
    FPaintLock: Integer;
    procedure MarkupChanged(AMarkup: TObject);

    procedure SetInvalidateLinesMethod(const AValue : TInvalidateLines); virtual;
    procedure SetLines(const AValue : TSynEditStrings); virtual;
    procedure SetTopLine(const AValue : Integer); virtual;
    procedure SetLinesInWindow(const AValue : Integer); virtual;
    procedure SetCaret(const AValue : TSynEditCaret); virtual;

    procedure DoEnabledChanged(Sender: TObject); virtual;
    procedure DoCaretChanged(Sender: TObject); virtual;
    procedure DoTopLineChanged(OldTopLine : Integer); virtual;
    procedure DoLinesInWindoChanged(OldLinesInWindow : Integer); virtual;
    procedure DoTextChanged(StartLine, EndLine, ACountDiff: Integer); virtual; // 1 based
    procedure DoMarkupChanged(AMarkup: TSynSelectedColor); virtual;
    procedure DoVisibleChanged(AVisible: Boolean); virtual;

    procedure InvalidateSynLines(FirstLine, LastLine: integer); // Call Synedt to invalidate lines
    function ScreenRowToRow(aRow : Integer) : Integer;
    function RowToScreenRow(aRow : Integer) : Integer;
    function LogicalToPhysicalPos(const p: TPoint): TPoint;
    function PhysicalToLogicalPos(const p: TPoint): TPoint;
    function Highlighter: TSynCustomHighlighter;
    function OwnedByMgr: Boolean; virtual; // overwrite, do prevent destruction by mgr

    // Merge with results from others
    procedure GetNextMarkupColAfterRowColEx(const aRow: Integer;
                                            const aStartCol: TLazSynDisplayTokenBound;
                                            const AnRtlInfo: TLazSynDisplayRtlInfo;
                                            var   ANextPhys, ANextLog: Integer);

    property SynEdit : TSynEditBase read fSynEdit;
  public
    constructor Create(ASynEdit : TSynEditBase);
    destructor Destroy; override;
    Procedure PrepareMarkupForRow(aRow : Integer); virtual;
    Procedure FinishMarkupForRow(aRow : Integer); virtual;
    Procedure EndMarkup; virtual;
    Function  GetMarkupAttributeAtRowCol(const aRow: Integer;
                                         const aStartCol: TLazSynDisplayTokenBound;
                                         const AnRtlInfo: TLazSynDisplayRtlInfo) : TSynSelectedColor; virtual; abstract;
    Procedure GetNextMarkupColAfterRowCol(const aRow: Integer;
                                          const aStartCol: TLazSynDisplayTokenBound;
                                          const AnRtlInfo: TLazSynDisplayRtlInfo;
                                          out   ANextPhys, ANextLog: Integer); virtual; abstract;
    procedure MergeMarkupAttributeAtRowCol(const aRow: Integer;
                                           const aStartCol, AEndCol :TLazSynDisplayTokenBound;
                                           const AnRtlInfo: TLazSynDisplayRtlInfo;
                                           AMarkup: TSynSelectedColorMergeResult); virtual;

    // Notifications about Changes to the text
    Procedure TextChanged(aFirstCodeLine, aLastCodeLine, ACountDiff: Integer); virtual; // 1 based
    Procedure TempDisable;
    Procedure TempEnable;
    procedure IncPaintLock; virtual;
    procedure DecPaintLock; virtual;
    function  RealEnabled: Boolean; virtual;

    property MarkupInfo : TSynSelectedColor read fMarkupInfo;
    property FGColor : TColor read GetFGColor;
    property BGColor : TColor read GetBGColor;
    property FrameColor: TColor read GetFrameColor;
    property FrameStyle: TSynLineStyle read GetFrameStyle;
    property Style : TFontStyles read GetStyle;
    property Enabled: Boolean read GetEnabled write SetEnabled;
    property Lines : TSynEditStrings read fLines write SetLines;
    property Caret : TSynEditCaret read fCaret write SetCaret;
    property TopLine : Integer read fTopLine write SetTopLine;
    property LinesInWindow : Integer read fLinesInWindow write SetLinesInWindow;
    property InvalidateLinesMethod : TInvalidateLines write SetInvalidateLinesMethod;
  end;

  { TSynEditMarkupManager }

  TSynEditMarkupManager = class(TSynEditMarkup) { TODO: Forward onchange calls to all others }
  private
    fMarkUpList : TList;
    function GetMarkup(Index: integer): TSynEditMarkup;
    function GetMarkupByClass(Index: TSynEditMarkupClass): TSynEditMarkup;

  protected
    procedure SetInvalidateLinesMethod(const AValue : TInvalidateLines); override;
    procedure SetLines(const AValue : TSynEditStrings); override;
    procedure SetTopLine(const AValue : Integer); override;
    procedure SetLinesInWindow(const AValue : Integer); override;
    procedure SetCaret(const AValue : TSynEditCaret); override;
  public
    constructor Create(ASynEdit : TSynEditBase);
    destructor Destroy; override;
    procedure IncPaintLock; override;
    procedure DecPaintLock; override;
    procedure DoVisibleChanged(AVisible: Boolean); override;

    Procedure AddMarkUp(aMarkUp : TSynEditMarkup; AsFirst: Boolean = False);
    Procedure RemoveMarkUp(aMarkUp : TSynEditMarkup);
    function Count: Integer;
    property Markup[Index: integer]: TSynEditMarkup
      read GetMarkup;
    property MarkupByClass[Index: TSynEditMarkupClass]: TSynEditMarkup
      read GetMarkupByClass;

    Procedure PrepareMarkupForRow(aRow : Integer); override;
    Procedure FinishMarkupForRow(aRow : Integer); override;
    Procedure EndMarkup; override;
    Function  GetMarkupAttributeAtRowCol(const aRow: Integer;
                                         const aStartCol: TLazSynDisplayTokenBound;
                                         const AnRtlInfo: TLazSynDisplayRtlInfo) : TSynSelectedColor; override;
    procedure GetNextMarkupColAfterRowCol(const aRow: Integer;
                                          const aStartCol: TLazSynDisplayTokenBound;
                                          const AnRtlInfo: TLazSynDisplayRtlInfo;
                                          out   ANextPhys, ANextLog: Integer); override;
    procedure MergeMarkupAttributeAtRowCol(const aRow: Integer;
                                           const aStartCol, AEndCol :TLazSynDisplayTokenBound;
                                           const AnRtlInfo: TLazSynDisplayRtlInfo;
                                           AMarkup: TSynSelectedColorMergeResult); override;

    // Notifications about Changes to the text
    Procedure TextChanged(aFirstCodeLine, aLastCodeLine, ACountDiff: Integer); override;
  end;


  
implementation
uses SynEdit;

{ TSynEditMarkup }

function TSynEditMarkup.GetBGColor : TColor;
begin
  result := fMarkupInfo.Background;
end;

function TSynEditMarkup.GetEnabled: Boolean;
begin
  Result := FEnabled and (FTempEnable = 0);
end;

function TSynEditMarkup.GetFGColor : TColor;
begin
  result := fMarkupInfo.Foreground;
end;

function TSynEditMarkup.GetFrameColor: TColor;
begin
  Result := fMarkupInfo.FrameColor;
end;

function TSynEditMarkup.GetFrameStyle: TSynLineStyle;
begin
  Result := FMarkupInfo.FrameStyle;
end;

function TSynEditMarkup.GetStyle : TFontStyles;
begin
  Result := fMarkupInfo.Style;
end;

procedure TSynEditMarkup.SetBGColor(const AValue : TColor);
begin
  if fMarkupInfo.Background = AValue then exit;
  fMarkupInfo.Background := AValue;
end;

procedure TSynEditMarkup.SetEnabled(const AValue: Boolean);
begin
  if AValue = FEnabled then exit;
  FEnabled := AValue;
  DoEnabledChanged(self);
end;

procedure TSynEditMarkup.SetFGColor(const AValue : TColor);
begin
  if fMarkupInfo.Foreground = AValue then exit;
  fMarkupInfo.Foreground := AValue;
end;

procedure TSynEditMarkup.SetFrameColor(const AValue: TColor);
begin
  if fMarkupInfo.FrameColor = AValue then exit;
  fMarkupInfo.FrameColor := AValue;
end;

procedure TSynEditMarkup.SetStyle(const AValue : TFontStyles);
begin
  if fMarkupInfo.Style = AValue then exit;
  fMarkupInfo.Style := AValue;
end;

procedure TSynEditMarkup.MarkupChanged(AMarkup : TObject);
begin
  DoMarkupChanged(AMarkup as TSynSelectedColor);
end;

procedure TSynEditMarkup.SetLines(const AValue : TSynEditStrings);
begin
  if fLines = AValue then exit;
  fLines := AValue;
end;

procedure TSynEditMarkup.SetInvalidateLinesMethod(const AValue : TInvalidateLines);
begin
  if fInvalidateLinesMethod = AValue then exit;
  fInvalidateLinesMethod := AValue;
end;

procedure TSynEditMarkup.SetCaret(const AValue : TSynEditCaret);
var
  r: Boolean;
begin
  // only register caret change callback, if handler is overriden
  r := TMethod(@Self.DoCaretChanged).Code <> Pointer(@TSynEditMarkup.DoCaretChanged);
  if r and (FCaret <> nil) then
    FCaret.RemoveChangeHandler(@DoCaretChanged);
  FCaret := AValue;
  if r and (FCaret <> nil) then
    FCaret.AddChangeHandler(@DoCaretChanged);
end;

procedure TSynEditMarkup.DoEnabledChanged(Sender: TObject);
begin
end;

procedure TSynEditMarkup.SetTopLine(const AValue : Integer);
var
  OldValue : Integer;
begin
  if fTopLine = AValue then exit;
  OldValue :=fTopLine;
  fTopLine := AValue;
  DoTopLineChanged(OldValue);
end;

procedure TSynEditMarkup.SetLinesInWindow(const AValue : Integer);
var
  OldValue : Integer;
begin
  if FLinesInWindow = AValue then exit;
  OldValue :=FLinesInWindow;
  FLinesInWindow := AValue;
  DoLinesInWindoChanged(OldValue);
end;

procedure TSynEditMarkup.DoCaretChanged(Sender: TObject);
begin
end;

procedure TSynEditMarkup.DoTopLineChanged(OldTopLine : Integer);
begin
end;

procedure TSynEditMarkup.DoLinesInWindoChanged(OldLinesInWindow : Integer);
begin
end;

procedure TSynEditMarkup.DoTextChanged(StartLine, EndLine, ACountDiff: Integer);
begin
end;

procedure TSynEditMarkup.DoMarkupChanged(AMarkup : TSynSelectedColor);
begin
end;

procedure TSynEditMarkup.DoVisibleChanged(AVisible: Boolean);
begin
  //
end;

procedure TSynEditMarkup.InvalidateSynLines(FirstLine, LastLine : integer);
begin
  if assigned(fInvalidateLinesMethod)
  then fInvalidateLinesMethod(FirstLine, LastLine);
end;

function TSynEditMarkup.ScreenRowToRow(aRow : Integer) : Integer;
begin
  Result := TCustomSynEdit(SynEdit).ScreenRowToRow(aRow);
end;

function TSynEditMarkup.RowToScreenRow(aRow : Integer) : Integer;
begin
  Result := TCustomSynEdit(SynEdit).RowToScreenRow(aRow);
end;

function TSynEditMarkup.LogicalToPhysicalPos(const p : TPoint) : TPoint;
begin
  Result := FLines.LogicalToPhysicalPos(p);
end;

function TSynEditMarkup.PhysicalToLogicalPos(const p: TPoint): TPoint;
begin
  Result := FLines.PhysicalToLogicalPos(p);
end;

function TSynEditMarkup.Highlighter : TSynCustomHighlighter;
begin
  Result := TCustomSynEdit(SynEdit).Highlighter;
end;

function TSynEditMarkup.OwnedByMgr: Boolean;
begin
  Result := True;
end;

procedure TSynEditMarkup.GetNextMarkupColAfterRowColEx(const aRow: Integer;
  const aStartCol: TLazSynDisplayTokenBound; const AnRtlInfo: TLazSynDisplayRtlInfo;
  var ANextPhys, ANextLog: Integer);
var
  p, l : integer;
begin
  if not RealEnabled then
    exit;
  GetNextMarkupColAfterRowCol(aRow, aStartCol, AnRtlInfo, p, l);

  if p > 0 then begin
    if AnRtlInfo.IsRtl then begin
      if p >= aStartCol.Physical then begin
        debugln(['Bad Next phys pos in GetNextMarkupColAfterRowCol ',p,' wanted < ',aStartCol.Physical, ' from ',ClassName]);
      end
      else
        if (p > ANextPhys) or (ANextPhys<0) then ANextPhys := p;
    end else begin
      if p <= aStartCol.Physical then begin
        debugln(['Bad Next phys pos in GetNextMarkupColAfterRowCol ',p,' wanted > ',aStartCol.Physical, ' from ',ClassName]);
      end
      else
        if (p < ANextPhys) or (ANextPhys<0) then ANextPhys := p;
    end;
  end;

  if (l > 0) and (l <= aStartCol.Logical) then begin
    debugln(['Bad Next logic pos in GetNextMarkupColAfterRowCol ',p,' wanted > ',aStartCol.Physical, ' from ',ClassName]);
  end
  else
    if ((l>0) and (l < ANextLog)) or (ANextLog<0) then ANextLog := l;
end;

constructor TSynEditMarkup.Create(ASynEdit : TSynEditBase);
begin
  inherited Create();
  fSynEdit := ASynEdit;
  FEnabled := true;
  FTempEnable := 0;
  fMarkupInfo := TSynSelectedColor.Create;
  fMarkupInfo.OnChange := @MarkupChanged;
end;

destructor TSynEditMarkup.Destroy;
begin
  // unregister caret handler
  Caret := nil;
  FreeAndNil(fMarkupInfo);
  inherited Destroy;
end;

procedure TSynEditMarkup.FinishMarkupForRow(aRow: Integer);
begin
end;

procedure TSynEditMarkup.EndMarkup;
begin
end;

procedure TSynEditMarkup.MergeMarkupAttributeAtRowCol(const aRow: Integer;
  const aStartCol, AEndCol: TLazSynDisplayTokenBound;
  const AnRtlInfo: TLazSynDisplayRtlInfo; AMarkup: TSynSelectedColorMergeResult);
var
  c: TSynSelectedColor;
begin
  c := GetMarkupAttributeAtRowCol(aRow, aStartCol, AnRtlInfo);
  if assigned(c) then
    AMarkup.Merge(c, aStartCol, AEndCol);
end;

procedure TSynEditMarkup.TextChanged(aFirstCodeLine, aLastCodeLine, ACountDiff: Integer);
begin
  DoTextChanged(aFirstCodeLine, aLastCodeLine, ACountDiff);
end;

procedure TSynEditMarkup.TempDisable;
begin
  inc(FTempEnable);
end;

procedure TSynEditMarkup.TempEnable;
begin
  if FTempEnable > 0 then
    dec(FTempEnable);
end;

procedure TSynEditMarkup.IncPaintLock;
begin
  inc(FPaintLock);
end;

procedure TSynEditMarkup.DecPaintLock;
begin
  if FPaintLock > 0 then
    dec(FPaintLock);
end;

function TSynEditMarkup.RealEnabled: Boolean;
begin
  Result := Enabled and MarkupInfo.IsEnabled;
end;

procedure TSynEditMarkup.PrepareMarkupForRow(aRow: Integer);
begin
end;

{ TSynEditMarkupManager }

constructor TSynEditMarkupManager.Create(ASynEdit : TSynEditBase);
begin
  inherited Create(ASynEdit);
  fMarkUpList := TList.Create;
end;

destructor TSynEditMarkupManager.Destroy;
var
  i : integer;
begin
  for i := 0 to fMarkUpList.Count-1 do
    if TSynEditMarkup(fMarkUpList[i]).OwnedByMgr then
      TSynEditMarkup(fMarkUpList[i]).destroy;
  FreeAndNil(fMarkUpList);
  inherited Destroy;
end;

procedure TSynEditMarkupManager.IncPaintLock;
var
  i: Integer;
begin
  inherited IncPaintLock;
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).IncPaintLock;
end;

procedure TSynEditMarkupManager.DecPaintLock;
var
  i: Integer;
begin
  inherited DecPaintLock;
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).DecPaintLock;
end;

procedure TSynEditMarkupManager.AddMarkUp(aMarkUp: TSynEditMarkup; AsFirst: Boolean);
begin
  if AsFirst then
    fMarkUpList.Insert(0, aMarkUp)
  else
    fMarkUpList.Add(aMarkUp);
  aMarkUp.Lines := Lines;
  aMarkUp.Caret := Caret;
  aMarkUp.TopLine := TopLine;
  aMarkUp.LinesInWindow := LinesInWindow;
  aMarkUp.InvalidateLinesMethod := FInvalidateLinesMethod;
end;

procedure TSynEditMarkupManager.RemoveMarkUp(aMarkUp: TSynEditMarkup);
var
  i: LongInt;
begin
  i := fMarkUpList.IndexOf(aMarkUp);
  if i >= 0 then begin
    // unregister the caret handler, no longer controled by this synedit
    TSynEditMarkup(fMarkUpList[i]).Caret := nil;
    fMarkUpList.Delete(i);
  end;
end;

function TSynEditMarkupManager.Count: Integer;
begin
  Result := fMarkUpList.Count;
end;

procedure TSynEditMarkupManager.FinishMarkupForRow(aRow: Integer);
var
  i : integer;
begin
  for i := 0 to fMarkUpList.Count-1 do
    if TSynEditMarkup(fMarkUpList[i]).RealEnabled then
      TSynEditMarkup(fMarkUpList[i]).FinishMarkupForRow(aRow);
end;

procedure TSynEditMarkupManager.EndMarkup;
var
  i : integer;
begin
  for i := 0 to fMarkUpList.Count-1 do
    if TSynEditMarkup(fMarkUpList[i]).RealEnabled then
      TSynEditMarkup(fMarkUpList[i]).EndMarkup;
end;

procedure TSynEditMarkupManager.PrepareMarkupForRow(aRow: Integer);
var
  i : integer;
begin
  for i := 0 to fMarkUpList.Count-1 do
    if TSynEditMarkup(fMarkUpList[i]).RealEnabled then
      TSynEditMarkup(fMarkUpList[i]).PrepareMarkupForRow(aRow);
end;

procedure TSynEditMarkupManager.MergeMarkupAttributeAtRowCol(const aRow: Integer;
  const aStartCol, AEndCol: TLazSynDisplayTokenBound; const AnRtlInfo: TLazSynDisplayRtlInfo;
  AMarkup: TSynSelectedColorMergeResult);
var
  i : integer;
begin
  for i := 0 to fMarkUpList.Count-1 do begin
    if TSynEditMarkup(fMarkUpList[i]).RealEnabled then
      TSynEditMarkup(fMarkUpList[i]).MergeMarkupAttributeAtRowCol
        (aRow, aStartCol, AEndCol, AnRtlInfo, AMarkup);
  end;
end;

function TSynEditMarkupManager.GetMarkupAttributeAtRowCol(const aRow: Integer;
  const aStartCol: TLazSynDisplayTokenBound;
  const AnRtlInfo: TLazSynDisplayRtlInfo): TSynSelectedColor;
begin
  assert(false);
  Result := MarkupInfo;
  Result.Clear;
  //MergeMarkupAttributeAtRowCol(aRow, aCol, GetNextMarkupColAfterRowCol(aRow, aCol) - 1, Result);
end;

procedure TSynEditMarkupManager.GetNextMarkupColAfterRowCol(const aRow: Integer;
  const aStartCol: TLazSynDisplayTokenBound; const AnRtlInfo: TLazSynDisplayRtlInfo; out ANextPhys,
  ANextLog: Integer);
var
  i : integer;
begin
  ANextLog := -1;
  ANextPhys := -1;
  if fMarkUpList.Count = 0
  then exit;
  TSynEditMarkup(fMarkUpList[0]).GetNextMarkupColAfterRowCol(aRow, aStartCol, AnRtlInfo, ANextPhys, ANextLog);
  for i := 1 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).GetNextMarkupColAfterRowColEx(aRow, aStartCol, AnRtlInfo, ANextPhys, ANextLog);
end;

procedure TSynEditMarkupManager.TextChanged(aFirstCodeLine, aLastCodeLine,
  ACountDiff: Integer);
var
  i : integer;
begin
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).TextChanged(aFirstCodeLine, aLastCodeLine, ACountDiff);
end;

function TSynEditMarkupManager.GetMarkup(Index: integer): TSynEditMarkup;
begin
  Result := TSynEditMarkup(fMarkUpList[Index]);
end;

function TSynEditMarkupManager.GetMarkupByClass(Index: TSynEditMarkupClass): TSynEditMarkup;
var
  i : Integer;
begin
  Result := nil;
  for i := 0 to fMarkUpList.Count-1 do
    if TSynEditMarkup(fMarkUpList[i]).ClassType = Index then
      exit(TSynEditMarkup(fMarkUpList[i]));
end;

procedure TSynEditMarkupManager.SetInvalidateLinesMethod(const AValue : TInvalidateLines);
var
  i : integer;
begin
  inherited SetInvalidateLinesMethod(AValue);
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).SetInvalidateLinesMethod(AValue);
end;

procedure TSynEditMarkupManager.SetLines(const AValue : TSynEditStrings);
var
  i : integer;
begin
  inherited SetLines(AValue);
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).SetLines(AValue) ;
end;

procedure TSynEditMarkupManager.SetTopLine(const AValue : Integer);
var
  i : integer;
begin
  inherited SetTopLine(AValue);
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).SetTopLine(AValue);
end;

procedure TSynEditMarkupManager.SetLinesInWindow(const AValue : Integer);
var
  i : integer;
begin
  inherited SetLinesInWindow(AValue);
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).SetLinesInWindow(AValue);
end;

procedure TSynEditMarkupManager.SetCaret(const AValue : TSynEditCaret);
var
  i : integer;
begin
  inherited SetCaret(AValue);
  if fMarkUpList = nil then exit;
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).SetCaret(AValue);
end;

procedure TSynEditMarkupManager.DoVisibleChanged(AVisible: Boolean);
var
  i: Integer;
begin
  inherited DoVisibleChanged(AVisible);
  if fMarkUpList = nil then exit;
  for i := 0 to fMarkUpList.Count-1 do
    TSynEditMarkup(fMarkUpList[i]).DoVisibleChanged(AVisible);
end;

end.


(*
  procedure CalculateNextChangePos(FromPos: Integer);
    begin
      ChangePos:= nc2+1; // Draw the Rest
      ChangeTyp := [];

      hsCol1   := fMarkupHighAll.GetNextMarkupColAfterRowCol(CurLine, FromPos-1);

      if (nC1Sel >= FromPos) then begin
        ChangePos := nC1Sel;
        ChangeTyp := [cSelOn];
      end;
      if ((nC2Sel >= FromPos) and (nC2Sel <= ChangePos)) then begin
        if (nC2Sel < ChangePos)
        then ChangeTyp := [cSelOff]
        else include(ChangeTyp, cSelOff);
        ChangePos := nC2Sel;
      end;

      if ((hsCol1 >= FromPos) and (hsCol1 <= ChangePos)) then begin
        hsMarkup := fMarkupHighAll.GetMarkupAttributeAtRowCol(CurLine, hsCol1);
if hsMarkup<>nil then begin;
        if (hsCol1 < ChangePos)
        then ChangeTyp := [CHLightOn]
        else include(ChangeTyp, CHLightOn);
end else begin
        if (hsCol1 < ChangePos)
        then ChangeTyp := [CHLightOff]
        else include(ChangeTyp, CHLightOff);
end;
        ChangePos := hsCol1;

        // only because this is last
      end;

    end;
  var
    CurrentColor : TDrawingColors;
    WantedColor : Set of TDrawingColors;
  procedure ExecuteChangePos;
    var
      NewColor : TDrawingColors;
    begin
      if (cSelOn in ChangeTyp)     then include(WantedColor, dcSelected);
      if (cSelOff in ChangeTyp)    then exclude(WantedColor, dcSelected);
      if (CHLightOn in ChangeTyp)  then include(WantedColor, dcHighlighted);
      if (CHLightOff in ChangeTyp) then exclude(WantedColor, dcHighlighted);

      if dcSelected in WantedColor
      then NewColor:= dcSelected
      else if dcHighlighted in WantedColor
      then NewColor:= dcHighlighted
      else NewColor:= dcNormal;

      if NewColor <> CurrentColor then SetDrawingColors(NewColor);
      CurrentColor:=NewColor;
    end;


*)
