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Posted 21 May 2002

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An unclickable button

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4.87/5 (40 votes)
30 May 2002CPOL
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?) :)

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

C++
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
Current passion project: CodeProject SenseAI. Please join in!

Chris is the Co-founder of the popular code-sharing site CodeProject.com, the digital advertising agency DeveloperMedia.com and the content marketing agency ContentLab.IO.

He's been programming way too long and has been, in various guides, an astrophysicist, mechanic, mathematician, physicist, breeder of carnivorous plants, hydrologist, geomorphologist, defence intelligence researcher and then, when all that got a bit rough on the nerves, a serial entrepreneur.

Chris has programmed everything from FORTRAN on a CRAY to Python on a Pi, but generally leans on TypeScript, C#, and SQL for the front, middle and back bits of his applications. His current focus is on ensuring developers know enough about Artificial Intelligence to be dangerous.

Comments and Discussions

 
GeneralMy vote is 0 (zero) Pin
Voevudko A. E., Ph.D.19-Dec-17 9:43
professionalVoevudko A. E., Ph.D.19-Dec-17 9:43 
GeneralMy vote of 5 Pin
Suvendu Shekhar Giri21-Oct-16 18:35
professionalSuvendu Shekhar Giri21-Oct-16 18:35 
GeneralCode to Click the UnClickable Pin
SoftwareDeveloperGoa7-Dec-10 12:50
MemberSoftwareDeveloperGoa7-Dec-10 12:50 
GeneralRe: Code to Click the UnClickable Pin
Super Lloyd7-Dec-10 13:19
MemberSuper Lloyd7-Dec-10 13:19 
GeneralMy vote of 3 Pin
drummerboy05118-Jul-10 13:13
professionaldrummerboy05118-Jul-10 13:13 
It's a good idea, I just wouldn't recommend using it too often,
GeneralRe: My vote of 3 Pin
Chris Maunder13-Oct-10 1:45
cofounderChris Maunder13-Oct-10 1:45 
GeneralRe: My vote of 3 Pin
Super Lloyd7-Dec-10 13:20
MemberSuper Lloyd7-Dec-10 13:20 
GeneralClassic Pin
blackjack215027-Jan-09 2:02
Memberblackjack215027-Jan-09 2:02 
QuestionIs there a editable button? Pin
vivadot26-May-04 13:45
Membervivadot26-May-04 13:45 
GeneralPlacing a button on the MainFrame Pin
Alex Evans4-Sep-03 19:43
MemberAlex Evans4-Sep-03 19:43 
GeneralRe: Placing a button on the MainFrame Pin
MasterOfBytes23-Apr-04 4:18
MemberMasterOfBytes23-Apr-04 4:18 
GeneralRe: Placing a button on the MainFrame Pin
Alex Evans25-Apr-04 22:55
MemberAlex Evans25-Apr-04 22:55 
GeneralDebuging Tool Pin
CSharpDavid31-May-02 6:13
MemberCSharpDavid31-May-02 6:13 
GeneralMFC70.dll Pin
Philippe Lhoste28-May-02 1:42
MemberPhilippe Lhoste28-May-02 1:42 
GeneralRe: MFC70.dll Pin
Chris Maunder30-May-02 20:35
cofounderChris Maunder30-May-02 20:35 
GeneralRe: MFC70.dll Pin
Philippe Lhoste2-Jun-02 22:28
MemberPhilippe Lhoste2-Jun-02 22:28 
GeneralRe: MFC70.dll Pin
Chris Maunder2-Jun-02 22:52
cofounderChris Maunder2-Jun-02 22:52 
GeneralDifferent Joke Control Pin
Paul M Watt24-May-02 16:20
mentorPaul M Watt24-May-02 16:20 
GeneralI clicked the unclickable! Pin
Tom Archer24-May-02 12:15
MemberTom Archer24-May-02 12:15 
GeneralRe: I clicked the unclickable! Pin
Nish Nishant24-May-02 14:45
sitebuilderNish Nishant24-May-02 14:45 
GeneralRe: I clicked the unclickable! Pin
Tom Archer24-May-02 15:18
MemberTom Archer24-May-02 15:18 
GeneralRe: I clicked the unclickable! Pin
Tom Archer24-May-02 15:20
MemberTom Archer24-May-02 15:20 
GeneralRe: I clicked the unclickable! Pin
Nish Nishant25-May-02 3:56
sitebuilderNish Nishant25-May-02 3:56 
GeneralRe: I clicked the unclickable! Pin
Bhaskar Priya24-Oct-06 2:06
MemberBhaskar Priya24-Oct-06 2:06 
GeneralRe: I clicked the unclickable! Pin
14-Jun-02 4:57
suss14-Jun-02 4:57 

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