TFindDialog

│ English (en) │ suomi (fi) │ français (fr) │ русский (ru) │ 中文（中国大陆）‎ (zh_CN) │

TFindDialog is a component that aids in finding information. It can be found on the Dialogs tab of the Component Palette.

To activate a FindDialog, just call its Execute() function. Create an OnFind method to perform the actual find.

Usage

procedure TForm1.Button1Click(Sender: TObject);
begin
  FindDialog1.Execute();
end;


procedure TForm1.FindDialog1Find(Sender: TObject);
var
  k: integer;
begin
  with Sender as TFindDialog do begin
    k := Pos(FindText, Memo1.Lines.Text);
    if k > 0 then begin
      Memo1.SelStart := k - 1;
      Memo1.SelLength := Length(FindText);
    end else
      Beep();
  end;
end;

If you want to repeat the operation several times with the same search text you must remember the last found position and continue searching from here - the function PosEx() in unit StrUtils is perfect for this purpose:

uses
  StrUtils;

type
  TForm1 = class(TForm)
  private
    FFoundPos: Integer;
    ...

procedure TForm1.Button1Click(Sender: TObject);
begin
  with FindDialog1 do 
  begin
    if frEntireScope in Options then    // Search begins at file start
      FFoundPos := 0
    else
      FFoundPos := Memo1.SelStart;      // Serach begins at current cursor position
    Execute;
  end;
end; 

procedure TForm1.FindDialog1Find(Sender: TObject);
begin
  with Sender as TFindDialog do 
  begin
    FFoundPos := PosEx(FindText, Memo1.Lines.Text, FFoundPos+1);
    if FFoundPos > 0 then 
    begin
      Memo1.SelStart := FFoundPos - 1;
      Memo1.SelLength := Length(FindText);
    end else
      Beep();
  end;
end;

See also

• TFindDialog doc
• TReplaceDialog