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   <META NAME="Author" CONTENT="Chris Maunder">
   <TITLE>PushButton - An Unclickable Button</TITLE>
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<CENTER><H3><FONT COLOR="#AOAO99">
An Unclickable Button
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<CENTER><H3><HR></H3></CENTER>

<!-- Author and contact details -->
This article was contributed by <A HREF="mailto:Chris.Maunder@cbr.clw.csiro.au">Chris Maunder</A>.

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<IMG SRC="trick_button.gif" width=241 height=147>&nbsp;
Download <A HREF="trick_button_src.zip">Source Code</a> and <A HREF="trick_button_demo.zip">Demo Project</A>
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<u>Environment:</u> VC++ 5.0 (SP3) NT 4.0 (SP3), Win95


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<p>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.

<p>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?) :)

<p>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).
<br>

<FONT COLOR="#990000"><TT><PRE>
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);
}
</tt></PRE></FONT>

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<p>Last updated: 16 June 1998

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<TD WIDTH="34%"><DIV ALIGN=right><FONT SIZE=-1>Contact me: <A HREF="mailto:zafir@home.com">zafir@home.com</A>&nbsp;</FONT></DIV></TD>
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