Creating Shaped UI Objects
by Steve Sipe

Example 1:


(a)

// (NOTE: m_rgnWnd must be a data member, not on the stack because Windows
// continues to use the region handle as long as the window object
// associated with it exists)
CRgn m_rgnWnd;

(b)

BOOL CMyDialog::OnInitDialog()
{
    // Call the base class
    CDialog::OnInitDialog();
    // Create a rectangular region (100x100) with rounded (30x30) corners
    m_rgnWnd.CreateRoundRectRgn(0,0,100,100,30,30);
    // Set the window's visible region to the specified shape
    SetWindowRgn(m_hWnd,m_rgnWnd);
    return TRUE;
}

Example 2:

class CCalculator : public CDialog, public CShape
{
private:
    // Any class derived from CShape must implement this method
    HWND GetHWND() { return m_hWnd; }
    ...
};

Example 3:

(a)

class CCalcKey : public CWnd, public CShape
{
    // Declare the custom control class
    // NOTE: argument MUST match class name
    DECLARE_SHAPECLASS(CCalcKey);
    ...
};

(b)

(various include files)
    ...
// Implement the custom control class
// NOTE: argument MUST match class name
IMPLEMENT_SHAPECLASS(CCalcKey);

(Rest of CCalcKey methods below) 
   ...

Example 4:

int CMyCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    // Create the OLE control (and CWnd object)
    if (COleControl::OnCreate(lpCreateStruct) == -1)
        return -1;
    // Use a CShape method to make it look like a star
    SetStarShape();
    return 0;
}
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