CUtlProps::OnPropertyChanged

Called after setting a property to handle chained properties.

virtual HRESULT OnPropertyChanged( 
   ULONG /* iCurSet */, 
   DBPROP* pDBProp  
);

Parameters

• iCurSet
  The index into the property-set array; zero if there is only one property set.

• pDBProp
  The property ID and new value in a DBPROP structure.

Return Value

A standard HRESULT. The default return value is S_OK.

Remarks

If you want to handle chained properties, such as bookmarks or updates whose values are dependent on another property's value, you should override this function.

Example

In this function, the user gets the property ID from the DBPROP* parameter. Now, it is possible to compare the ID against a property to chain. When the property is found, SetProperties is called with the property that will now be set in conjunction with the other property. In this case, if one gets the DBPROP_IRowsetLocate, DBPROP_LITERALBOOKMARKS, or DBPROP_ORDEREDBOOKMARKS property, one can set the DBPROP_BOOKMARKS property.

HRESULT OnPropertyChanged(ULONG /*iCurSet*/, DBPROP* pDBProp)
{
   ATLASSERT(pDBProp != NULL);

   DWORD dwPropertyID = pDBProp->dwPropertyID;

   if (dwPropertyID == DBPROP_IRowsetLocate || 
      dwPropertyID == DBPROP_LITERALBOOKMARKS ||
      dwPropertyID == DBPROP_ORDEREDBOOKMARKS)
   {
      CComVariant var = pDBProp->vValue;

      if (var.boolVal == VARIANT_TRUE)
      {
         // Set the bookmarks property as these are chained
         CComVariant bookVar(true);
         CDBPropSet set(DBPROPSET_ROWSET);
         set.AddProperty(DBPROP_BOOKMARKS, bookVar);

         return SetProperties(1, &set);
      }
   }

   return S_OK;
}

Requirements

Header: atldb.h

See Also

Reference

CUtlProps Class