previous | start | next

---

Mouse Events

• In the notification functions, you can query the wxMouseEvent about the event type (e.g. ButtonDown() returns true or false, GetX() returns the x-position of the mouse, etc.).

  void TriangleWindow::OnMouseEvent(wxMouseEvent& event)
  {
     if (event.ButtonDown() && corners < 3)
     {
        x[corners] = event.GetX();
        y[corners] = event.GetY();
        corners++;
        Refresh();
     }   
  }
  

• In our program, we allow the user to specify a triangle by clicking on the three corners.
• With each press, we record the mouse position.
• All drawing should happen in the paint handler.
• The Refresh function generates a paint event, which eventually causes the paint function to be called.
• Calling the paint function directly should never be done - always refresh instead.

---

previous | start | next