PRB: Appearance Property Uses Windows 4.0 WS_EX_CLIENTEDGE (152000)

MORE INFORMATION

Using the Class Wizard, add the stock Appearance property but choose Get/Set methods rather that accepting the stock implementation. In the control, declare a member variable of type BOOL to represent the Appearance property. The stock Get/Set functions can be copied and changed slightly to manipulate this variable as well as handle the property binding requirements. In the Draw function, draw a 3-D border depending on the value of this variable.

Sample Code

   // these get and set functions are the same as the original with a minor
   // change (noted in the code)

   short CTestAppearanceCtrl::GetAppearance()
   {
       return m_MyAppearance;
   }

   void CTestAppearanceCtrl::SetAppearance(short nNewValue)
   {
       if (nNewValue != 0 && nNewValue != 1)
           ThrowError(CTL_E_INVALIDPROPERTYVALUE,
                      AFX_IDP_E_INVALIDPROPERTYVALUE);

       // Is the property changing?
       if (m_MyAppearance == nNewValue)
           return;

       if (!BoundPropertyRequestEdit(DISPID_APPEARANCE))
           SetNotPermitted();

   // changed from original
       // do not use the WS_EX_CLIENTEDGE style
       //ASSERT((m_hWnd == NULL) ||
       //  ((GetExStyle() & WS_EX_CLIENTEDGE) == (DWORD)(m_sAppearance ?
       //      WS_EX_CLIENTEDGE : 0)));

       m_MyAppearance = nNewValue;
       SetModifiedFlag();

       //ToggleAppearance(this);
   // end of changes

       OnAppearanceChanged();

       BoundPropertyChanged(DISPID_APPEARANCE);
   }

   void CTestAppearanceCtrl::OnDraw(
               CDC* pdc, const CRect& rcBounds, const CRect& rcInvalid)
   {
       // TODO: Replace the following code with your own drawing code.
       pdc->FillRect(rcBounds,
            CBrush::FromHandle((HBRUSH)GetStockObject(WHITE_BRUSH)));
       pdc->Ellipse(rcBounds);

       // draw as 3D if m_appearance is set

       if(m_appearance)
       {
           CRect rect(rcBounds);
           pdc->DrawEdge(rect, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
       }
   }