draw,grid,top,row,DrawGrid,delphi

Patrick64 10/21/2016 0

This code uses a draw grid and a button on a form. When the user clicks the button, the last row of the draw grid becomes the top row. This example requires a button, a DrawGrid, and a populated ImageList.

Delphi
 procedure TForm1.Button1Click(Sender: TObject);
begin
  DrawGrid1.TopRow := DrawGrid1.RowCount - 1;
end;
 
procedure TForm1.DrawGrid1Click(Sender: TObject);
begin
  Label1.Caption := 'From OnClick: The cursor is in column '  
                     IntToStr(DrawGrid1.Col   1)   
                     ', row '  
                     IntToStr(DrawGrid1.Row   1);
end;
 
procedure TForm1.DrawGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
  Rect: TRect; State: TGridDrawState);
var
  index: Integer;
begin
  index := (ARow * DrawGrid1.ColCount   ACol) mod (DrawGrid1.ColCount   1);
  if (gdSelected in State) then
    DrawGrid1.Canvas.Brush.Color := clYellow
  else
    DrawGrid1.Canvas.Brush.Color := clBackground;
  DrawGrid1.Canvas.FillRect(Rect);
  if (gdFocused in State) then
  begin
    DrawGrid1.Canvas.DrawFocusRect(Rect);
    Label2.Caption:= 'From OnDrawCell: Cell '   InttoStr(ARow * DrawGrid1.ColCount   ACol)   ' has the focus.';
  end;
  if ((ARow >=  DrawGrid1.FixedRows) AND (ACol >=  DrawGrid1.FixedCols)) then
    ImageList1.Draw(DrawGrid1.Canvas,Rect.Left,Rect.Top,index, True);
end;
 
procedure TForm1.DrawGrid1SelectCell(Sender: TObject; ACol, ARow: Integer;
  var CanSelect: Boolean);
begin
  CanSelect:= True;
end; 

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