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Self-centering WTL property sheet

, 3 Nov 2002
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A small class to automatically center a WTL property sheet.

Introduction

This is a very simple class that will automatically center a WTL property sheet. One frequently-asked question in the various WTL forums is "How do I centre a CPropertySheet object?". Most people tend to add a GetParent().CenterWindow() call to the first page in the property sheet, but in my mind this is a little awkward.

Instead, simply #include "propertysheetex.h" and use CPropertySheetEx as a drop in replacement for the standard WTL CPropertySheet class.

Code

The actual code for the class is straightforward:

class CPropertySheetEx : public CPropertySheet
{
private:
    bool m_bCentered;
public:    
    CPropertySheetEx(WTL::_U_STRINGorID title = 
          (LPCTSTR)NULL, UINT uStartPage = 0, HWND hWndParent = NULL)
        : CPropertySheet(title, uStartPage, hWndParent), m_bCentered(false)
    {
    }
    
    BEGIN_MSG_MAP(CPropertySheetEx)
        MESSAGE_HANDLER(WM_SHOWWINDOW, OnShowWindow)
        CHAIN_MSG_MAP(CPropertySheet)
    END_MSG_MAP()

    LRESULT OnShowWindow(UINT /*uMsg*/, WPARAM wParam, 
          LPARAM /*lParam*/, BOOL& bHandled)
    {
        // Centre?
        if (wParam == TRUE)
            Center();
        // Ensure base-class gets this message
        bHandled = FALSE;
        return 0;
    }

    void Center(void)
    {
        // Only do this once
        if (!m_bCentered)
        {
            CenterWindow();
            m_bCentered = true;
        }
    }
};

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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GeneralThanks Pinmemberyunfei22-Aug-05 5:17 

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