/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFBall::Release
Summary: Release of the CFBall non-delegating IUnknown implementation.
Args: void
Modifies: m_cRefs.
Returns: ULONG
New value of m_cRefs (COM object's reference count).
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP_(ULONG) CFBall::Release(void)
{
ULONG cRefs = 0;
if (OwnThis())
{
cRefs = --m_cRefs;
if (0 == cRefs)
{
// We've reached a zero reference count for this COM object.
// So we tell the server housing to decrement its global object
// count so that the server will be unloaded if appropriate.
if (NULL != m_pServer)
m_pServer->ObjectsDown();
// We artificially bump the main ref count to prevent reentrancy
// via the main object destructor. Not really needed in this
// CFBall but a good practice because we are aggregatable and
// may at some point in the future add something entertaining like
// some Releases to the CFBall destructor.
m_cRefs++;
UnOwnThis();
delete this;
}
else
UnOwnThis();
}
return cRefs;
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFBall::QueryInterface
Summary: QueryInterface of the CFBall non-delegating
IUnknown implementation.
Args: REFIID riid,
[in] GUID of the Interface being requested.
PPVOID ppv)
[out] Address of the caller's pointer variable that will
receive the requested interface pointer.
Modifies: .
Returns: HRESULT
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP CFBall::QueryInterface(
REFIID riid,
PPVOID ppv)
{
HRESULT hr = E_NOINTERFACE;
if (OwnThis())
{
*ppv = NULL;
if (IID_IUnknown == riid)
*ppv = this;
else if (IID_IClassFactory == riid)
*ppv = &m_ImpIClassFactory;
if (NULL != *ppv)
{
// We've handed out a pointer to the interface so obey the COM rules
// and AddRef the reference count.
((LPUNKNOWN)*ppv)->AddRef();
hr = NOERROR;
}
UnOwnThis();
}
return (hr);
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: COBall::CImpIBall::GetBall
Summary: The GetBall member method of this IBall interface
implementation. Called by outside clients of a COBall object
to get the necessary data on the moving ball to enable GUI
display of an actual image of this virtual ball. This COBall
is a data entity only that is kept alive by client threads
that call Move. A GUI client can independently call GetBall
to allow it to display some visual representation of the Ball.
Args: POINT* pOrg,
Pointer to a point that will contain the current origin
position of the ball.
POINT* pExt,
Pointer to a point that will contain the current extent
size of the ball.
COLORREF* pcrColor)
Pointer to a COLORREF that will contain the current color
of the ball. This color is determined by the last thread
that was executing in the ball before this call is made.
Modifies: ...
Returns: void
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP COBall::CImpIBall::get_Ball(
POINT* pOrg,
POINT* pExt,
COLORREF* pcrColor)
{
HRESULT hr = E_FAIL;
if (OwnThis())
{
*pcrColor = m_crColor;
pOrg->x = 0;
pOrg->y = 0;
m_XForm.Point(pOrg);
pExt->x = m_nWidth;
pExt->y = m_nHeight;
m_XForm.Point(pExt);
hr = NOERROR;
UnOwnThis();
}
return hr;
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: COBall::CImpIBall::Reset
Summary: The Reset member method of the IBall interface implementation.
Called by outside clients of a COBall object to reset the
virtual ball. It is restored to the upper left corner.
Args: RECT* pNewRect,
Pointer to a RECT structure. Tells the COBall the bounding
rectangle within which the ball can move.
short nBallSize,
The size of the ball in pixels. nBallSize == Width == Height
meaning that a circle is assumed.
Modifies: ...
Returns: void
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP COBall::CImpIBall::Reset(
RECT* pNewRect,
short nBallSize)
{
HRESULT hr = E_FAIL;
int nDim, xDirection, yDirection;
if (OwnThis())
{
// Find the thread who is executing this and remember its color.
FindThread();
m_xSkew = m_ySkew = BALL_MOVE_SKEW;
m_WinRect.left = pNewRect->left;
m_WinRect.top = pNewRect->top;
m_WinRect.right = pNewRect->right;
m_WinRect.bottom = pNewRect->bottom;
nDim = nBallSize ? nBallSize : max(5, m_WinRect.right / 13);
SetDimensions(nDim, nDim);
SetPosition(0, 0);
xDirection = ((lRandom() % m_xSkew) + m_xSkew);
yDirection = ((lRandom() % m_ySkew) + m_ySkew);
SetDirection(xDirection, yDirection);
hr = NOERROR;
UnOwnThis();
}
return hr;
}
void CaComServer::Lock()
{
if (OwnThis())
{
m_cLocks += 1;
UnOwnThis();
}
}
void CaComServer::ObjectsUp()
{
if (OwnThis())
{
m_cObjects += 1;
UnOwnThis();
}
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: CFBall::AddRef
Summary: AddRef of the CFBall non-delegating IUnknown implementation.
Args: void
Modifies: m_cRefs.
Returns: ULONG
New value of m_cRefs (COM object's reference count).
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP_(ULONG) CFBall::AddRef(void)
{
ULONG cRefs = 0;
if (OwnThis())
{
cRefs = ++m_cRefs;
UnOwnThis();
}
return cRefs;
}
void CaComServer::ObjectsDown()
{
if (OwnThis())
{
if (m_cObjects > 0)
m_cObjects -= 1;
//
// If no more living objects and no locks then shut down the server.
if (0L == m_cObjects && 0L == m_cLocks )
{
//
// Destroy all the sessions in the cache
theApp.GetSessionManager().Cleanup();
}
UnOwnThis();
}
}
void CaComServer::Unlock()
{
if (OwnThis())
{
m_cLocks -= 1;
if (m_cLocks < 0)
m_cLocks = 0;
//
// If no more living objects and no locks then shut down the server.
if (0L == m_cObjects && 0L == m_cLocks && IsWindow(m_hWndServer))
{
//
// Post a message to this local server's message queue requesting
// a close of the application. This will force a termination of
// all apartment threads.
PostMessage(m_hWndServer, WM_CLOSE, 0, 0L);
}
UnOwnThis();
}
}
/*M+M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M+++M
Method: COBall::CImpIBall::Move
Summary: The Move member method of this IBall interface implementation.
Called by outside clients of a COBall object to advance the
"motion" of this COBall virtual ball entity.
Args: BOOL bAlive
TRUE means stay alive; FALSE means don't move but die.
Modifies: m_bAlive.
Returns: BOOL
TRUE means the move was done and the ball is still alive.
FALSE means the move was not done and the ball has been
killed.
M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M---M-M*/
STDMETHODIMP COBall::CImpIBall::Move(BOOL bAlive, BOOL* bRet)
{
*bRet = FALSE;
if (OwnThis())
{
if (bAlive)
{
// Find thread that is now executing this code. Remember its Id and
// assign it a color. If this thread previously visited here then
// use its remembered values. In any case, set a color value in
// m_crColor of its existing or newly assigned color.
FindThread();
// Ask the Ball if it has hit any of the edges of the current window
// rectangle. If so, it will recalculate its position and direction to
// achieve a "bounce" effect in its motion the next time it is painted.
CheckBounce();
// Calculate and set new ball position.
if(m_bNewPosition)
{
m_bNewPosition = FALSE;
m_XForm.Clear();
m_XForm.Trans(m_xPosition, m_yPosition);
}
else
m_XForm.Trans(m_xDirection, m_yDirection);
}
else
m_bAlive = FALSE;
*bRet = m_bAlive;
UnOwnThis();
}
return S_OK;
}
