qm_prichtext.pas

一个管理系统

    inherited AddStrings(Strings);
  finally
    RichEdit.OnSelectionChange := SelChange;
  end;
end;

function TRichEditStrings.GetCount: Integer;
begin
  Result := SendMessage(RichEdit.Handle, EM_GETLINECOUNT, 0, 0);
  if SendMessage(RichEdit.Handle, EM_LINELENGTH, SendMessage(RichEdit.Handle,
    EM_LINEINDEX, Result - 1, 0), 0) = 0 then Dec(Result);
end;

function TRichEditStrings.Get(Index: Integer): string;
var
  Text: array[0..4095] of Char;
  L: Integer;
begin
  Word((@Text)^) := SizeOf(Text);
  L := SendMessage(RichEdit.Handle, EM_GETLINE, Index, Longint(@Text));
  if (Text[L - 2] = #13) and (Text[L - 1] = #10) then Dec(L, 2);
  SetString(Result, Text, L);
end;

procedure TRichEditStrings.Put(Index: Integer; const S: string);
var
  Selection: TCharRange;
begin
  if Index >= 0 then
  begin
    Selection.cpMin := SendMessage(RichEdit.Handle, EM_LINEINDEX, Index, 0);
    if Selection.cpMin <> -1 then
    begin
      Selection.cpMax := Selection.cpMin +
        SendMessage(RichEdit.Handle, EM_LINELENGTH, Selection.cpMin, 0);
      SendMessage(RichEdit.Handle, EM_EXSETSEL, 0, Longint(@Selection));
      SendMessage(RichEdit.Handle, EM_REPLACESEL, 0, Longint(PChar(S)));
    end;
  end;
end;

procedure TRichEditStrings.Insert(Index: Integer; const S: string);
var
  L: Integer;
  Selection: TCharRange;
  Fmt: PChar;
  Str: string;
begin
  if Index >= 0 then
  begin
    Selection.cpMin := SendMessage(RichEdit.Handle, EM_LINEINDEX, Index, 0);
    if Selection.cpMin >= 0
      then Fmt := '%s'#13#10
    else
    begin
      Selection.cpMin :=
        SendMessage(RichEdit.Handle, EM_LINEINDEX, Index - 1, 0);
      if Selection.cpMin < 0 then Exit;
      L := SendMessage(RichEdit.Handle, EM_LINELENGTH, Selection.cpMin, 0);
      if L = 0 then Exit;
      Inc(Selection.cpMin, L);
      Fmt := #13#10'%s';
    end;
    Selection.cpMax := Selection.cpMin;
    SendMessage(RichEdit.Handle, EM_EXSETSEL, 0, Longint(@Selection));
    Str := Format(Fmt, [S]);
    SendMessage(RichEdit.Handle, EM_REPLACESEL, 0, LongInt(PChar(Str)));
    if RichEdit.SelStart <> (Selection.cpMax + Length(Str)) then
      raise EOutOfResources.Create('RichEdit line insertion error');
  end;
end;

procedure TRichEditStrings.Delete(Index: Integer);
const
  Empty: PChar = '';
var
  Selection: TCharRange;
begin
  if Index < 0 then Exit;
  Selection.cpMin := SendMessage(RichEdit.Handle, EM_LINEINDEX, Index, 0);
  if Selection.cpMin <> -1 then
  begin
    Selection.cpMax := SendMessage(RichEdit.Handle, EM_LINEINDEX, Index + 1, 0);
    if Selection.cpMax = -1 then
      Selection.cpMax := Selection.cpMin +
        SendMessage(RichEdit.Handle, EM_LINELENGTH, Selection.cpMin, 0);
    SendMessage(RichEdit.Handle, EM_EXSETSEL, 0, Longint(@Selection));
    SendMessage(RichEdit.Handle, EM_REPLACESEL, 0, Longint(Empty));
  end;
end;

procedure TRichEditStrings.Clear;
begin
  RichEdit.Clear;
end;

procedure TRichEditStrings.SetUpdateState(Updating: Boolean);
begin
  if RichEdit.Showing then
    SendMessage(RichEdit.Handle, WM_SETREDRAW, Ord(not Updating), 0);
  if not Updating then
  begin
    RichEdit.Refresh;
    RichEdit.Perform(CM_TEXTCHANGED, 0, 0);
  end;
end;

procedure TRichEditStrings.EnableChange(const Value: Boolean);
var
  EventMask: Longint;
begin
  with RichEdit do
  begin
    if Value then
      EventMask := SendMessage(Handle, EM_GETEVENTMASK, 0, 0) or ENM_CHANGE
    else
      EventMask := SendMessage(Handle, EM_GETEVENTMASK, 0, 0) and not ENM_CHANGE;
    SendMessage(Handle, EM_SETEVENTMASK, 0, EventMask);
  end;
end;

procedure TRichEditStrings.SetTextStr(const Value: string);
begin
  EnableChange(False);
  try
    inherited SetTextStr(Value);
  finally
    EnableChange(True);
  end;
end;

function AdjustLineBreaks(Dest, Source: PChar): Integer; assembler;
asm
        PUSH    ESI
        PUSH    EDI
        MOV     EDI,EAX
        MOV     ESI,EDX
        MOV     EDX,EAX
        CLD
@@1:    LODSB
@@2:    OR      AL,AL
        JE      @@4
        CMP     AL,0AH
        JE      @@3
        STOSB
        CMP     AL,0DH
        JNE     @@1
        MOV     AL,0AH
        STOSB
        LODSB
        CMP     AL,0AH
        JE      @@1
        JMP     @@2
@@3:    MOV     EAX,0A0DH
        STOSW
        JMP     @@1
@@4:    STOSB
        LEA     EAX,[EDI-1]
        SUB     EAX,EDX
        POP     EDI
        POP     ESI
end;

function StreamSave(dwCookie: Longint; pbBuff: PByte;
  cb: Longint; var pcb: Longint): Longint; stdcall;
var
  StreamInfo: PRichEditStreamInfo;
begin
  Result := NoError;
  StreamInfo := PRichEditStreamInfo(Pointer(dwCookie));
  try
    pcb := 0;
    if StreamInfo^.Converter <> nil then
      pcb := StreamInfo^.Converter.ConvertWriteStream(StreamInfo^.Stream, PChar(pbBuff), cb);
  except
    Result := WriteError;
  end;
end;

function StreamLoad(dwCookie: Longint; pbBuff: PByte;
  cb: Longint; var pcb: Longint): Longint; stdcall;
var
  Buffer, pBuff: PChar;
  StreamInfo: PRichEditStreamInfo;
begin
  Result := NoError;
  StreamInfo := PRichEditStreamInfo(Pointer(dwCookie));
  Buffer := StrAlloc(cb + 1);
  try
    cb := cb div 2;
    pcb := 0;
    pBuff := Buffer + cb;
    try
      if StreamInfo^.Converter <> nil then
        pcb := StreamInfo^.Converter.ConvertReadStream(StreamInfo^.Stream, pBuff, cb);
      if pcb > 0 then
      begin
        pBuff[pcb] := #0;
        if pBuff[pcb - 1] = #13 then pBuff[pcb - 1] := #0;
        pcb := AdjustLineBreaks(Buffer, pBuff);
        Move(Buffer^, pbBuff^, pcb);
      end;
    except
      Result := ReadError;
    end;
  finally
    StrDispose(Buffer);
  end;
end;

procedure TRichEditStrings.LoadFromStream(Stream: TStream);
var
  EditStream: TEditStream;
  Position: Longint;
  TextType: Longint;
  StreamInfo: TRichEditStreamInfo;
  Converter: TConversion;
begin
  StreamInfo.Stream := Stream;
  if FConverter <> nil then Converter := FConverter
  else Converter := RichEdit.DefaultConverter.Create;
  StreamInfo.Converter := Converter;
  try
    with EditStream do
    begin
      dwCookie := LongInt(Pointer(@StreamInfo));
      pfnCallBack := @StreamLoad;
      dwError := 0;
    end;
    Position := Stream.Position;
    if PlainText
      then TextType := SF_TEXT
      else TextType := SF_RTF;
    SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
    if (TextType = SF_RTF) and (EditStream.dwError <> 0) then
    begin
      Stream.Position := Position;
      if PlainText
        then TextType := SF_RTF
        else TextType := SF_TEXT;
      SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
      if EditStream.dwError <> 0 then
        raise EOutOfResources.Create('Failed to Load Stream');
    end;
  finally
    if FConverter = nil then Converter.Free;
  end;
end;

procedure TRichEditStrings.SaveToStream(Stream: TStream);
var
  EditStream: TEditStream;
  TextType: Longint;
  StreamInfo: TRichEditStreamInfo;
  Converter: TConversion;
begin
  if FConverter <> nil then Converter := FConverter
  else Converter := RichEdit.DefaultConverter.Create;
  StreamInfo.Stream := Stream;
  StreamInfo.Converter := Converter;
  try
    with EditStream do
    begin
      dwCookie := LongInt(Pointer(@StreamInfo));
      pfnCallBack := @StreamSave;
      dwError := 0;
    end;
    if PlainText then TextType := SF_TEXT
    else TextType := SF_RTF;
    SendMessage(RichEdit.Handle, EM_STREAMOUT, TextType, Longint(@EditStream));
    if EditStream.dwError <> 0 then
      raise EOutOfResources.Create('Failed to Save Stream');
  finally
    if FConverter = nil then Converter.Free;
  end;
end;

procedure TRichEditStrings.LoadFromFile(const FileName: string);
begin
  inherited LoadFromFile(FileName);
end;

procedure TRichEditStrings.SaveToFile(const FileName: string);
begin
  inherited SaveToFile(FileName);
end;

end.