The control

Implementing the control is done with the class CLatchedSwitchCtrl. As members this class has the CPictureHolder objects for the storage of the bitmaps. Additionally three dispatch drivers for the dynamic element and the variables are generated:

class CLatchedSwitchCtrl : public COleControl

{

DECLARE_DYNCREATE(CLatchedSwitchCtrl)

// Constructor

public:

CLatchedSwitchCtrl();

// Overrides

// ClassWizard generated virtual function overrides

//{{AFX_VIRTUAL(CLatchedSwitchCtrl)

public:

virtual void OnDraw (CDC* pdc, const CRect& rcBounds, const CRect& rcInvalid);

virtual void DoPropExchange (CPropExchange* pPX);

virtual void OnResetState ();

virtual DWORD GetControlFlags();

//}}AFX_VIRTUAL

// Implementation

protected:

~CLatchedSwitchCtrl();

DECLARE_OLECREATE_EX(CLatchedSwitchCtrl) // Class factory and guid

DECLARE_OLETYPELIB(CLatchedSwitchCtrl) // GetTypeInfo

DECLARE_PROPPAGEIDS(CLatchedSwitchCtrl) // Property page IDs

DECLARE_OLECTLTYPE(CLatchedSwitchCtrl) // Type name and misc status

// Message maps

//{{AFX_MSG(CLatchedSwitchCtrl)

afx_msg void OnLButtonDown(UINT nFlags, CPoint point);

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

// Dispatch maps

//{{AFX_DISPATCH(CLatchedSwitchCtrl)

BOOL m_sollwertDirekt;

afx_msg void OnSollwertDirektChanged();

afx_msg LPPICTUREDISP GetSwitchOn();

afx_msg void SetSwitchOn(LPPICTUREDISP newValue);

afx_msg LPPICTUREDISP GetSwitchOff();

afx_msg void SetSwitchOff(LPPICTUREDISP newValue);

afx_msg LPPICTUREDISP GetLatchedOn();

afx_msg void SetLatchedOn(LPPICTUREDISP newValue);

afx_msg LPPICTUREDISP GetLatchedOff();

afx_msg void SetLatchedOff(LPPICTUREDISP newValue);

afx_msg short CanUseVariables();

afx_msg short VariableTypes();

afx_msg short MaxVariables();

afx_msg BOOL zenOnInit(LPDISPATCH dispElement);

afx_msg BOOL zenOnExit();

//}}AFX_DISPATCH

CPictureHolder m_SwitchOn;

CPictureHolder m_SwitchOff;

CPictureHolder m_LatchedOn;

CPictureHolder m_LatchedOff;

DECLARE_DISPATCH_MAP()

afx_msg void AboutBox();

// Event maps

//{{AFX_EVENT(CLatchedSwitchCtrl)

//}}AFX_EVENT

DECLARE_EVENT_MAP()

double VariantToDouble(const VARIANT FAR *v);

void VariantToCString(CString *c,const VARIANT FAR *v);

BOOL IsVariantString(const VARIANT FAR *v);

BOOL IsVariantValue(const VARIANT FAR *v);

// Dispatch and event IDs

public:

CString szVariable[2];

IElement m_dElement;

IVariable m_dLatchVar, m_dSwitchVar;

enum {

//{{AFX_DISP_ID(CLatchedSwitchCtrl)

dispidSollwertDirekt = 1L,

dispidSwitchOn = 2L,

dispidSwitchOff = 3L,

dispidLatchedOn = 4L,

dispidLatchedOff = 5L,

dispidCanUseVariables = 6L,

dispidVariableTypes = 7L,

dispidMaxVariables = 8L,

dispidZenOnInit = 9L,

dispidZenOnExit = 10L,

//}}AFX_DISP_ID

};