【 tulaoshi.com - 编程语言 】
Delphi // 指定输入游标的位置 procedure SetCaret(RTF: TRichEdit; var Row, Col: Word); var i, iStopLine, iSelStart: integer; begin if (RTF = nil) then Exit; if Row = 0 then Row := 1;
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!-- frame contents -- !-- /frame contents --
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if Col = 0 then Col := 1;// 到第 Row 列, Col 行共几个字元 iStopLine := Row - 1; iSelStart := 0; for i := 0 to RTF.Lines.Count - 1 do begin if i = iStopLine then begin if Length(RTF.Lines[i]) $#@62;= Col then Inc(iSelStart, Col) else Inc(iSelStart, Length(RTF.Lines[i]) + 2); Break; end; Inc(iSelStart, Length(RTF.Lines[i]) + 2); end; if iSelStart $#@62; 0 then Dec(iSelStart);// 以设定标记的方式指定游标位置 SendMessage(RTF.Handle, EM_SETSEL, iSelStart, iSelStart);// 再次侦测游标位置 Row := SendMessage(RTF.Handle, EM_LINEFROMCHAR, RTF.SelStart, 0); Col := RTF.SelStart - SendMessage(RTF.Handle, EM_LINEINDEX, Row, 0);// 卷到游标所在位置 SendMessage(RTF.Handle, EM_SCROLLCARET, 0, 0); end; procedure TForm1.Button1Click(Sender: TObject); var iRow, iCol: word; begin iRow := 17; iCol := 3; SetCaret(RichEdit1, iRow, iCol); RichEdit1.SetFocus; end;
