TMouse.WheelPresent Property

Specifies whether the mouse has a wheel.

Pascal

property WheelPresent: Boolean;

C++

__property Boolean WheelPresent;

Description

Use WheelPresent to determine whether the mouse has a wheel.

C++ Examples:

Copy Code

/*
This example uses two check boxes, three edit boxes and
a timer component on a form.  When the application starts,
the check boxes get checked by the application depending on
whether a mouse is detected and whether
a wheel button is available. The first edit box displays
the number of lines that are scrolled each time the wheel button
is rotated. The other two edit boxes display the position
of the mouse cursor at each millisecond, using the timer component.
*/
void __fastcall TForm1::FormCreate(TObject *Sender)
{
  CheckBox1->Checked = Mouse->MousePresent;
  CheckBox2->Checked = Mouse->WheelPresent;
  Edit1->Text = IntToStr(Mouse->WheelScrollLines);
  Edit2->Text = IntToStr((int)Mouse->CursorPos.x);
  Edit3->Text = IntToStr((int)Mouse->CursorPos.y);
}

void __fastcall TForm1::Timer1Timer(TObject *Sender)
{
  Edit2->Text = IntToStr((int)Mouse->CursorPos.x);
  Edit3->Text = IntToStr((int)Mouse->CursorPos.y);
}

Delphi Examples:

Copy Code

{
This example uses two check boxes, three edit boxes and
a timer component on a form.  When the application starts,
the check boxes get checked by the application depending on
whether a mouse is detected and whether
a wheel button is available. The first edit box displays
the number of lines that are scrolled each time the wheel button
is rotated. The other two edit boxes display the position
of the mouse cursor at each millisecond, using the timer component.
}
procedure TForm1.FormCreate(Sender: TObject);
begin
  CheckBox1.Checked := Mouse.MousePresent;
  CheckBox2.Checked := Mouse.WheelPresent;
  Edit1.Text := IntToStr(Mouse.WheelScrollLines);
  Edit2.Text := IntToStr(Mouse.CursorPos.X);
  Edit3.Text := IntToStr(Mouse.CursorPos.Y);
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  Edit1.Text := IntToStr(Mouse.WheelScrollLines);
  Edit2.Text := IntToStr(Mouse.CursorPos.X);
  Edit3.Text := IntToStr(Mouse.CursorPos.Y);
end;