Dbgrid ñ öâåòíûìè ÿ÷åéêàìè III
C öâåòîì ÿ÷åéêè DBGrid íå òàê âñå ïðîñòî, âåäü â Delphi 1.0 ðàçóêðàñèòü ÿ÷åéêó ìîæíî â îáðàáîò÷èêå ñîáûòèÿ OnDrawDataCell, òîãäà êàê â Delphi 2.0 âàì ïðèäåòñÿ ïðèáåãíóòü ê ñîáûòèþ OnDrawColumnCell. Äëÿ òîãî ÷òîáû ñîçäàòü êîä, êîòîðûé áû ðàáîòàë â ÎÁÎÈÕ âåðñèõ Delphi, âàì íåîáõîäèìî ïðèáåãíóòü ê ìåõàíèçìó óñëîâíîé êîìïèëÿöèè, ñ ïîìîùüþ êîòîðîãî âû ìîæåòå ÑÊÐÛÒÜ îáðàáîò÷èê OnDrawColumnCell â Delphi 1.0 è ÂÊËÞ×ÈÒÜ åãî â Delphi 2.0. Âîò ïðèìåð, â êîòîðîì âñå ÿ÷åéêè ñòðîêè ðèñóþòñÿ êðàñíûì, åñëè êîëîíêà 'Preferred' ñîäåðæèò 'True':
| ...private{ Private declarations }{$IFDEF Win32}procedure DBGrid1DrawColumnCell(Sender: TObject;const Rect: TRect; DataCol: Integer; Column: TColumn;State: TGridDrawState);{$ENDIF}procedure DrawField(const Value: String; const Rect: TRect;vCanvas: TCanvas; vFont: TFont; vAlignment: TAlignment);...procedure TForm1.DrawField(const Value: String; const Rect: TRect;vCanvas: TCanvas; vFont: TFont; vAlignment: TAlignment);VAR X : Integer;BEGINvCanvas.Font := vFont;vCanvas.Font.Color := clRed;vCanvas.Font.Style := vCanvas.Font.Style + [fsUnderline];CASE vAlignment OFtaRightJustify : BEGINSetTextAlign(vCanvas.Handle, TA_RIGHT);X := Rect.Right-2;END;taLeftJustify : BEGINSetTextAlign(vCanvas.Handle, TA_LEFT);X := Rect.Left+2;END;taCenter : BEGINSetTextAlign(vCanvas.Handle, TA_CENTER);X := (Rect.Right+Rect.Left) DIV 2;END;END;vCanvas.TextRect(Rect, X, Rect.Top+2, Value);SetTextAlign(vCanvas.Handle, TA_LEFT);END; procedure TForm1.DBGrid1DrawDataCell(Sender: TObject; const Rect:TRect; Field: TField; State: TGridDrawState);beginWITH Sender AS TDBGrid, DataSource.DataSet DOBEGINIF FieldByName('Preferred').AsString <> 'True' THEN Exit;DrawField(Field.DisplayText, Rect, Canvas, Canvas.Font,Field.Alignment);END;end; {$IFDEF Win32}procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject;const Rect: TRect; DataCol: Integer; Column: TColumn;State: TGridDrawState);beginWITH Sender AS TDBGrid, DataSource.DataSet DOBEGINIF FieldByName('Preferred').AsString <> 'True' THEN Exit;DrawField(Column.Field.DisplayText, Rect, Canvas,Column.Font, Column.Alignment);END;end;{$ENDIF} procedure TForm1.FormCreate(Sender: TObject);begin{$IFDEF Win32}DBGrid1.OnDrawDataCell := NIL;DBGrid1.OnDrawColumnCell := DBGrid1DrawColumnCell;{$ENDIF}end; |
- Neil Rubenking [000968]
