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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
