OnDrawCell (C++)

Description

The following code uses the bitmaps in an image list component to draw the contents of each cell in a draw grid. It draws a focus rectangle around the cell that has focus. goDrawFocusSelect in the DrawGrid Options parameter must be True to set focus on a cell. The ImageList Draw method must be called after DrawFocusRect. The OnSelectCell event handler must be implemented to return True.

Code

void __fastcall TForm1::DrawGrid1DrawCell(
  TObject *Sender, int ACol, int ARow, TRect &Rect, TGridDrawState State)
{
  long index = ARow * DrawGrid1->ColCount + ACol;
  DrawGrid1->Canvas->Brush->Color = clBackground;
  DrawGrid1->Canvas->FillRect(Rect);
  if (State.Contains(gdFocused))
  {
        DrawGrid1->Canvas->DrawFocusRect(Rect);
        Label1->Caption = "Cell " + IntToStr(int(index)) + " has the focus.";
  }
  ImageList1->Draw(
        DrawGrid1->Canvas, Rect.Left, Rect.Top, index, True);
}
 
void __fastcall TForm1::DrawGrid1SelectCell(TObject *Sender, int ACol, int ARow,
      bool &CanSelect)
{
  CanSelect= True;
}

Uses

• Vcl.Grids.TCustomDrawGrid.OnDrawCell ( fr | de | ja )
• Vcl.Grids.TCustomDrawGrid.OnSelectCell ( fr | de | ja )
• Vcl.Controls.TCustomControl.Canvas ( fr | de | ja )
• Vcl.Graphics.TCanvas.DrawFocusRect ( fr | de | ja )
• Vcl.ImgList.TCustomImageList.Draw ( fr | de | ja )
• Vcl.Grids.TCustomGrid.Options ( fr | de | ja )
• Vcl.Grids.TGridOptions ( fr | de | ja )