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...print only the selected Text of TRichedit?
Autor: P. Below
Homepage: http://www.teamb.com
[ Print tip ]  

Tip Rating (2):  
     


uses
  
Richedit;

procedure TForm1.Button1Click(Sender: TObject);
var
  
printarea: TRect;
  richedit_outputarea: TRect;
  printresX, printresY: Integer;
  fmtRange: TFormatRange;
  nextChar: Integer;
  S: string;
begin
  
Printer.BeginDoc;
  try
    with 
Printer.Canvas do
    begin
      
printresX := GetDeviceCaps(Handle, LOGPIXELSX);
      printresY := GetDeviceCaps(Handle, LOGPIXELSY);
      printarea :=
        Rect(printresX,  // 1 inch left margin
        
printresY * 3 div 2,  // 1.5 inch top margin
        
Printer.PageWidth - printresX, // 1 inch right margin
        
Printer.PageHeight - printresY * 3 div // 1.5 inch
        
Bottom Margin);
      // Define a rectangle for the rich edit text. The height is set
      
to the
      // maximum. But we need to convert from device units to twips,
      // 1 twip = 1/1440 inch or 1/20 point.
      
richedit_outputarea :=
        Rect(printarea.Left * 1440 div printresX,
        printarea.Top * 1440 div printresY,
        printarea.Right * 1440 div printresX,
        printarea.Bottom * 1440 div printresY);

      // Tell rich edit to format its text to the printer. First set
      // up data record for message:
      
fmtRange.hDC := Handle;            // printer handle
      
fmtRange.hdcTarget := Handle;     // ditto
      
fmtRange.rc := richedit_outputarea;
      fmtRange.rcPage := Rect(0, 0,
        Printer.PageWidth * 1440 div printresX,
        Printer.PageHeight * 1440 div printresY);
      // set range of characters to print to selection
      
fmtRange.chrg.cpMin := richedit1.selstart;
      fmtRange.chrg.cpMax := richedit1.selStart + richedit1.sellength - 1;

      // remove characters that need not be printed from end of
      
selection.
      // failing to do so screws up the repeat loop below.
      
S := Richedit1.SelText;
      while (fmtRange.chrg.cpMax > 0) and
        
(S[fmtRange.chrg.cpMax] <= ' ') do Dec(fmtRange.chrg.cpMax);

      repeat
        
// Render the text
        
nextChar := richedit1.Perform(EM_FORMATRANGE, 1, Longint(@fmtRange));
        if nextchar < fmtRange.chrg.cpMax then
        begin
          
// more text to print
          
printer.newPage;
          fmtRange.chrg.cpMin := nextChar;
        end{ If }
      
until nextchar >= fmtRange.chrg.cpMax;

      // Free cached information
      
Richedit1.Perform(EM_FORMATRANGE, 0, 0);
    end;
  finally
    
Printer.EndDoc;
  end;
end;

{
  The richedit1.perform( EM_FORMATRANGE call returns the index of the
  last character that could be fitted into the passed fmtrange.rc, + 1.
  So if  multiple pages are required one repeats with fmtrange.chrg.cpMin
  set to this value, until all characters have been printed.
}


 

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