Changing the Tool with Speed Buttons
Go Up to Handling Multiple Drawing Objects in Your Application
Each drawing tool needs an associated OnClick event handler. Suppose your application had a toolbar button for each of four drawing tools: line, rectangle, ellipse, and rounded rectangle. You would attach the following event handlers to the OnClick events of the four drawing-tool buttons, setting DrawingTool to the appropriate value for each:
procedure TForm1.LineButtonClick(Sender: TObject);{ LineButton }
begin
DrawingTool := dtLine;
end;
procedure TForm1.RectangleButtonClick(Sender: TObject);{ RectangleButton }
begin
DrawingTool := dtRectangle;
end;
procedure TForm1.EllipseButtonClick(Sender: TObject);{ EllipseButton }
begin
DrawingTool := dtEllipse;
end;
procedure TForm1.RoundedRectButtonClick(Sender: TObject);{ RoundRectButton }
begin
DrawingTool := dtRoundRect;
end;
void __fastcall TForm1::LineButtonClick(TObject * Sender)
// LineButton
{
DrawingTool = dtLine;
}
void __fastcall TForm1::RectangleButtonClick(TObject * Sender)
// RectangleButton
{
DrawingTool = dtRectangle;
}
void __fastcall TForm1::EllipseButtonClick(TObject * Sender)
// EllipseButton
{
DrawingTool = dtEllipse;
}
void __fastcall TForm1::RoundedRectButtonClick(TObject * Sender)
// RoundRectBtn
{
DrawingTool = dtRoundRect;
}