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An unclickable button

, 30 May 2002
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What looks like a normal pushbutton - until the user tries to click on it.

Sample Image - trick_button.gif

Introduction 

I wrote this many years ago 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?) Smile | :)

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).

The WM_SETFOCUS message has also been handled to bounce the focus back to the window that previously had focus, and PreSubclassWindow has been overridden to allow the removal of the WS_TABSTOP window style bit. This ensures that the user can't tab to the control.

The guts of it all

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)

    CRect NewButtonRect = ButtonRect;                   // New position (parent coords)

    if (point.x > 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 < 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 > 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 < 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);
}

void CTrickButton::OnSetFocus(CWnd* pOldWnd)
{
    CButton::OnSetFocus(pOldWnd);

    // Give the focus right back to the window that justn gave it to us
    if (pOldWnd!=NULL && ::IsWindow(pOldWnd->GetSafeHwnd()))
        pOldWnd->SetFocus();
}

void CTrickButton::PreSubclassWindow()
{
    // Ensure that the TabStop style is removed from the control
    ModifyStyle(WS_TABSTOP, 0);
    CButton::PreSubclassWindow();
}

History

31 May 2002 - updated to include removal of WM_TABSTOP, plus minor cleanup.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Chris Maunder
Founder CodeProject
Canada Canada
Chris is the Co-founder, Administrator, Architect, Chief Editor and Shameless Hack who wrote and runs The Code Project. He's been programming since 1988 while pretending to be, in various guises, an astrophysicist, mathematician, physicist, hydrologist, geomorphologist, defence intelligence researcher and then, when all that got a bit rough on the nerves, a web developer. He is a Microsoft Visual C++ MVP both globally and for Canada locally.
 
His programming experience includes C/C++, C#, SQL, MFC, ASP, ASP.NET, and far, far too much FORTRAN. He has worked on PocketPCs, AIX mainframes, Sun workstations, and a CRAY YMP C90 behemoth but finds notebooks take up less desk space.
 
He dodges, he weaves, and he never gets enough sleep. He is kind to small animals.
 
Chris was born and bred in Australia but splits his time between Toronto and Melbourne, depending on the weather. For relaxation he is into road cycling, snowboarding, rock climbing, and storm chasing.
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Comments and Discussions

 
GeneralCode to Click the UnClickable PinmemberSoftwareDeveloperGoa7-Dec-10 12:50 
GeneralRe: Code to Click the UnClickable PinmemberSuper Lloyd7-Dec-10 13:19 
GeneralMy vote of 3 Pinmemberdrummerboy05118-Jul-10 13:13 
GeneralRe: My vote of 3 PinadminChris Maunder13-Oct-10 1:45 
GeneralRe: My vote of 3 PinmemberSuper Lloyd7-Dec-10 13:20 
GeneralClassic Pinmemberblackjack215027-Jan-09 2:02 
QuestionIs there a editable button? Pinmembervivadotnet26-May-04 13:45 
GeneralPlacing a button on the MainFrame PinmemberAlex Evans4-Sep-03 19:43 
GeneralRe: Placing a button on the MainFrame PinmemberMasterOfBytes23-Apr-04 4:18 
GeneralRe: Placing a button on the MainFrame PinmemberAlex Evans25-Apr-04 22:55 
GeneralDebuging Tool PinmemberDavid Gallagher31-May-02 6:13 
GeneralMFC70.dll PinmemberPhilippe Lhoste28-May-02 1:42 
GeneralRe: MFC70.dll PinadminChris Maunder30-May-02 20:35 
GeneralRe: MFC70.dll PinmemberPhilippe Lhoste2-Jun-02 22:28 
GeneralRe: MFC70.dll PinadminChris Maunder2-Jun-02 22:52 
GeneralDifferent Joke Control Pinmemberkilowatt24-May-02 16:20 
GeneralI clicked the unclickable! PinmemberTom Archer24-May-02 12:15 
GeneralRe: I clicked the unclickable! PinmemberNish - Native CPian24-May-02 14:45 
GeneralRe: I clicked the unclickable! PinmemberTom Archer24-May-02 15:18 
GeneralRe: I clicked the unclickable! PinmemberTom Archer24-May-02 15:20 
GeneralRe: I clicked the unclickable! PinmemberNish - Native CPian25-May-02 3:56 
GeneralRe: I clicked the unclickable! PinmemberBhaskarPriya24-Oct-06 2:06 
GeneralRe: I clicked the unclickable! PinmemberAnonymous14-Jun-02 4:57 
GeneralRe: I clicked the unclickable! Pinmembermla15421-Jan-13 7:52 
GeneralPerfect PinmemberMark Nischalke23-May-02 14:51 

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