DrawGridCol (C++)

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The following code uses the bitmaps in an image list component to draw the contents of each cell in a draw grid. It uses a draw grid with a label above it on a form. When you click a cell in the grid, the location of the cursor is displayed in the label caption. This example requires a populated image list; otherwise, it can just display an empty grid.


void __fastcall TForm1::DrawGrid1Click(TObject *Sender)
  Label1->Caption = "From OnClick: The cursor is in column " +
					 IntToStr(DrawGrid1->Col + 1) +
                     ", row " +
                     IntToStr(DrawGrid1->Row + 1);

void __fastcall TForm1::DrawGrid1DrawCell(TObject *Sender, int ACol, int ARow, TRect &Rect,
          TGridDrawState State)
  int index = ARow * DrawGrid1->ColCount + ACol;
  DrawGrid1->Canvas->Brush->Color = clBackground;
  ImageList1->Draw(DrawGrid1->Canvas, Rect.Left, Rect.Top, index, True);
  if (State.Contains(gdFocused))
	Label2->Caption = "From OnDrawCell: Cell " + IntToStr(index) +
	  " has the focus.";

void __fastcall TForm1::DrawGrid1SelectCell(TObject *Sender, int ACol, int ARow, bool &CanSelect)
  CanSelect = True;