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Creating a Hovering Control

Tuesday Nov 5th 2002 by Gilad Novik

Add hovering support to any MFC control with this template class.

Environment: VC6 SP5, WIN2K SP2

This is a template class for creating hovering controls. It uses the _TrackMouseEvent method to recieve notifications regarding mouse events.

To use it, you need to create a new class deriving from the desired type (CButton, CEdit, and so forth) and add the template code there. You also need to override two pure virtual functions: OnOverEnter() and OnHoverLeave(). Your class recieves notifications via those functions. There is also a function called IsHover(), which can return the hovering state.

In the demo project, I've created two simple classes; one is derived from CButton and the other one is derived from CEdit. They both react to mouse events.

#include "TrackControl.h"
class CHoverButton : public CTrackControl<CButton>
{
public:
  virtual void OnHoverEnter()
  {
    Invalidate();
  }
  virtual void OnHoverLeave()
  {
    Invalidate();
  }
}

Downloads

Download demo project - 24 Kb
Download source - 1 Kb
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