Поместить изображение смайлика в TRxRichEdit

Delphi , Компоненты и Классы , TMemo и TRichEdit

Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

var
   frmMain: TfrmMain;

 implementation

 {$R *.DFM}
 {$R Smiley.res}

 uses
   RichEdit;

 type
   TEditStreamCallBack = function(dwCookie: Longint; pbBuff: PByte;
     cb: Longint; var pcb: Longint): DWORD;
   stdcall;

   TEditStream = record
     dwCookie: Longint;
     dwError: Longint;
     pfnCallback: TEditStreamCallBack;
   end;

 type
   TMyRichEdit = TRxRichEdit;

 // EditStreamInCallback callback function 

function EditStreamInCallback(dwCookie: Longint; pbBuff: PByte;
   cb: Longint; var pcb: Longint): DWORD; stdcall;
 var
   theStream: TStream;
   dataAvail: LongInt;
 begin
   theStream := TStream(dwCookie);
   with theStream do
   begin
     dataAvail := Size - Position;
     Result := 0;
     if dataAvail <= cb then
     begin
       pcb := read(pbBuff^, dataAvail);
       if pcb <> dataAvail then
         Result := UINT(E_FAIL);
     end
     else
     begin
       pcb := read(pbBuff^, cb);
       if pcb <> cb then
         Result := UINT(E_FAIL);
     end;
   end;
 end;

 // Insert Stream into RichEdit 

procedure PutRTFSelection(RichEdit: TMyRichEdit; SourceStream: TStream);
 var
   EditStream: TEditStream;
 begin
   with EditStream do
   begin
     dwCookie := Longint(SourceStream);
     dwError := 0;
     pfnCallback := EditStreamInCallBack;
   end;
   RichEdit.Perform(EM_STREAMIN, SF_RTF or SFF_SELECTION, Longint(@EditStream));
 end;

 // Load a smiley image from resource 

function GetSmileyCode(ASimily: string): string;
 var
   dHandle: THandle;
   pData, pTemp: PChar;
   Size: Longint;
 begin
   pData := nil;
   dHandle := FindResource(hInstance, PChar(ASimily), RT_RCDATA);
   if dHandle <> 0 then
   begin
     Size := SizeofResource(hInstance, dHandle);
     dhandle := LoadResource(hInstance, dHandle);
     if dHandle <> 0 then
       try
         pData := LockResource(dHandle);
         if pData <> nil then
           try
             if pData[Size - 1] = #0 then
             begin
               Result := StrPas(pTemp);
             end
             else
             begin
               pTemp := StrAlloc(Size + 1);
               try
                 StrMove(pTemp, pData, Size);
                 pTemp[Size] := #0;
                 Result := StrPas(pTemp);
               finally
                 StrDispose(pTemp);
               end;
             end;
           finally
             UnlockResource(dHandle);
           end;
       finally
         FreeResource(dHandle);
       end;
   end;
 end;

 procedure InsertSmiley(ASmiley: string);
 var
   ms: TMemoryStream;
   s: string;
 begin
   ms := TMemoryStream.Create;
   try
     s := GetSmileyCode(ASmiley);
     if s <> '' then
     begin
       ms.Seek(0, soFromEnd);
       ms.Write(PChar(s)^, Length(s));
       ms.Position := 0;
       PutRTFSelection(frmMain.RXRichedit1, ms);
     end;
   finally
     ms.Free;
   end;
 end;

 procedure TfrmMain.SpeedButton1Click(Sender: TObject);
 begin
   InsertSmiley('Smiley1');
 end;

 procedure TfrmMain.SpeedButton2Click(Sender: TObject);
 begin
   InsertSmiley('Smiley2');
 end;

 // Replace a :-) or :-( with a corresponding smiley 

procedure TfrmMain.RxRichEdit1KeyPress(Sender: TObject; var Key: Char);
 var
  sCode, SmileyName: string;

   procedure RemoveText(RichEdit: TMyRichEdit);
   begin
     with RichEdit do
     begin
       SelStart := SelStart - 2;
       SelLength := 2;
       SelText :=  '';
     end;
   end;

 begin
  If (Key = ')') or (Key = '(')  then
  begin
    sCode := Copy(RxRichEdit1.Text, RxRichEdit1.SelStart-1, 2) + Key;
    SmileyName := '';
    if sCode = ':-)'  then SmileyName := 'Smiley1';
    if sCode = ':-('  then SmileyName := 'Smiley2';
    if SmileyName <> '' then
    begin
      Key := #0;
      RemoveText(RxRichEdit1);
      InsertSmiley('Smiley1');
    end;
  end;
 end;

Статья Поместить изображение смайлика в TRxRichEdit раздела Компоненты и Классы TMemo и TRichEdit может быть полезна для разработчиков на Delphi и FreePascal.

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