An Unclickable Button

 
Download Source Code and Demo Project

Environment: VC++ 5.0 (SP3) NT 4.0 (SP3), Win95

I wrote this a while back for a friend. It is basically just a normal
pushbutton, except that when the user tries to click on it, it moves out
of the way making it practically un-clickable.

I have no idea what anyone would ever want to use such a control in
their app, apart from wanting to be extremely annoying to users (and hey –
don’t we all get like that on occasion?) 🙂

The button is just a normal button with OnMouseMove overridden: (m_nJumpDistance
is the distance in pixels to jump once the mouse has moved over the control).

void CTrickButton::OnMouseMove(UINT nFlags, CPoint point)

{

    CWnd* pParent = GetParent();

    if (!pParent) pParent = GetDesktopWindow();

    CRect ParentRect;                                   // Parent client area (Parent coords)

    pParent->GetClientRect(ParentRect);
    ClientToScreen(&point);                             // Convert point to parent coords

    pParent->ScreenToClient(&point);
    CRect ButtonRect;                                   // Button Dimensions (Parent coords)

    GetWindowRect(ButtonRect);

    pParent->ScreenToClient(ButtonRect);

    CPoint Center = ButtonRect.CenterPoint();           // Center of button (parent coords)
    CSize CriticalSize(ButtonRect.Width()/6, ButtonRect.Height()/6);
    CRect NewButtonRect = ButtonRect;                    // New position (parent coords)
    if (point.x – CriticalSize.cx > Center.x)            // Mouse is right of center

    {

        if (ButtonRect.left > ParentRect.left + ButtonRect.Width() + m_nJumpDistance)

            NewButtonRect -= CSize(ButtonRect.right – point.x + m_nJumpDistance, 0);

        else

            NewButtonRect += CSize(point.x – ButtonRect.left + m_nJumpDistance, 0);

    }

    else if (point.x + CriticalSize.cx < Center.x)      // Mouse is left of center
    {
        if (ButtonRect.right < ParentRect.right - ButtonRect.Width() - m_nJumpDistance)
            NewButtonRect += CSize(point.x - ButtonRect.left + m_nJumpDistance, 0);
        else
            NewButtonRect -= CSize(ButtonRect.right - point.x + m_nJumpDistance, 0);
    }

    if (point.y - CriticalSize.cy > Center.y)           // Mouse is below center

    {

        if (ButtonRect.top > ParentRect.top + ButtonRect.Height() + m_nJumpDistance)

            NewButtonRect -= CSize(0, ButtonRect.bottom – point.y + m_nJumpDistance);

        else

            NewButtonRect += CSize(0, point.y – ButtonRect.top + m_nJumpDistance);

    }

    else if (point.y + CriticalSize.cy < Center.y)      // Mouse is above center
    {
        if (ButtonRect.bottom < ParentRect.bottom - ButtonRect.Height() - m_nJumpDistance)
            NewButtonRect += CSize(0, point.y - ButtonRect.top + m_nJumpDistance);
        else
            NewButtonRect -= CSize(0, ButtonRect.bottom - point.y + m_nJumpDistance);
    }

    MoveWindow(NewButtonRect);
    RedrawWindow();

	CButton::OnMouseMove(nFlags, point);
}

Last updated: 16 June 1998