ATL Splitter ActiveX control

// Splitter.h : Declaration of the CSplitter

#ifndef __SPLITTER_H_
#define __SPLITTER_H_

#include "resource.h"       // main symbols
#include <atlctl.h>

struct CControlInfo
{
	CComBSTR		m_strName;
	IOleObjectPtr	m_pOleObject;

	CControlInfo& operator=(const CControlInfo& other)
	{
		m_strName=other.m_strName;
		m_pOleObject=other.m_pOleObject;
		return *this;
	}
};

class CControlInfoArray : public std::vector<CControlInfo>
{
public:
	int IndexOf(const BSTR strName);
};



#define DISPID_SPLITTER_PERCENT_POSITION 1
#define DISPID_FIRST_CONTROL_NAME 3
#define DISPID_SECOND_CONTROL_NAME 4

class CSplitter;

class CHiddenWindow : public CWindowImpl<CHiddenWindow>
{
public:
	CSplitter*		m_pSplitter;

	CHiddenWindow()
	{
		m_pSplitter=NULL;
	}

BEGIN_MSG_MAP(CHiddenWindow)	
MESSAGE_HANDLER(WM_TIMER, OnTimer)
END_MSG_MAP()
	LRESULT OnTimer(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
};

/////////////////////////////////////////////////////////////////////////////
// CSplitter
class ATL_NO_VTABLE CSplitter : 
	public CComObjectRootEx<CComSingleThreadModel>,
	public IDispatchImpl<ISplitter, &IID_ISplitter, &LIBID_SPLITTERATLCONTROLLib>,
	public CComControl<CSplitter>,
	public IPersistStreamInitImpl<CSplitter>,
	public IOleControlImpl<CSplitter>,
	public IOleObjectImpl<CSplitter>,
	public IOleInPlaceActiveObjectImpl<CSplitter>,
	public IViewObjectExImpl<CSplitter>,
	public IOleInPlaceObjectWindowlessImpl<CSplitter>,
	public ISupportErrorInfo,
	public IConnectionPointContainerImpl<CSplitter>,
	public IPersistStorageImpl<CSplitter>,
	public ISpecifyPropertyPagesImpl<CSplitter>,
	public IQuickActivateImpl<CSplitter>,
	public IDataObjectImpl<CSplitter>,
	public IProvideClassInfo2Impl<&CLSID_Splitter, &DIID__ISplitterEvents, &LIBID_SPLITTERATLCONTROLLib>,
	public IPropertyNotifySinkCP<CSplitter>,
	public IPerPropertyBrowsingImpl<CSplitter>,
	public CComCoClass<CSplitter, &CLSID_Splitter>
{
	friend class CHiddenWindow;

	float		m_fltSplitterPercentPosition;
	BOOL		m_bSplitterIsVertical;
	CComBSTR	m_strFirstControlName;
	CComBSTR	m_strSecondControlName;

	CControlInfoArray	m_arrayControls;
	BOOL				m_bTracking;
	RECT				m_rectTracking;
	SIZE				m_sizeTrackingOffset;
	HBRUSH				m_hbrHalftone;
	int					m_SplitterWidth;
	int					m_SplitterHeight;
	CHiddenWindow		m_wndHidden;

	void CalcSplitterRectBySplitterPercentPosition(float fltPercentPosition,
													RECT& rectSplitter,
													const RECT& rectControl);

	float CalcSplitterPercentPositionBySplitterRect(const RECT& rect,
													const RECT& rectControl);

	void GetRects(RECT& rectFirstPane,
					RECT& rectSecondPane,
					RECT& rectSplitter,
					const RECT& rectControl);

	//Returns the extended name of the control, which has been asigned
	//to it by the container (form)
	//pDispatch is the interface provided by the container's site object
	CComBSTR GetExtendedName(IDispatchPtr pDispatch);

	void GetOtherControlsOnTheContainer();
	void PlaceControlOnPane(const BSTR strControlName,const RECT& rectPane);
	void AdjustControlsToPanes();
	void DelayAdjustControlsToPanes();
	
	void InvertTracker(const RECT& rect);
	void CalcNewTrackingRect(POINT ptMouse,RECT* pRectResult);
	HBRUSH GetHalftoneBrush();

	POINT GetMouseCursorPosInContainerCoords();


public:
	CSplitter()
	{
		m_fltSplitterPercentPosition=50;
		m_bSplitterIsVertical=TRUE;
		m_bTracking=FALSE;
		m_hbrHalftone=NULL;
		m_SplitterWidth=GetSystemMetrics(SM_CXFRAME);
		m_SplitterHeight=GetSystemMetrics(SM_CYFRAME);
		m_wndHidden.m_pSplitter=this;
	}

	~CSplitter()
	{
		::DeleteObject(m_hbrHalftone);
		if(m_wndHidden.m_hWnd)
			m_wndHidden.DestroyWindow();
	}

	

DECLARE_REGISTRY_RESOURCEID(IDR_SPLITTER)

DECLARE_PROTECT_FINAL_CONSTRUCT()

BEGIN_COM_MAP(CSplitter)
	COM_INTERFACE_ENTRY(ISplitter)
	COM_INTERFACE_ENTRY(IDispatch)
	COM_INTERFACE_ENTRY(IViewObjectEx)
	COM_INTERFACE_ENTRY(IViewObject2)
	COM_INTERFACE_ENTRY(IViewObject)
	COM_INTERFACE_ENTRY(IOleInPlaceObjectWindowless)
	COM_INTERFACE_ENTRY(IOleInPlaceObject)
	COM_INTERFACE_ENTRY2(IOleWindow, IOleInPlaceObjectWindowless)
	COM_INTERFACE_ENTRY(IOleInPlaceActiveObject)
	COM_INTERFACE_ENTRY(IOleControl)
	COM_INTERFACE_ENTRY(IOleObject)
	COM_INTERFACE_ENTRY(IPersistStreamInit)
	COM_INTERFACE_ENTRY2(IPersist, IPersistStreamInit)
	COM_INTERFACE_ENTRY(ISupportErrorInfo)
	COM_INTERFACE_ENTRY(IConnectionPointContainer)
	COM_INTERFACE_ENTRY(ISpecifyPropertyPages)
	COM_INTERFACE_ENTRY(IQuickActivate)
	COM_INTERFACE_ENTRY(IPersistStorage)
	COM_INTERFACE_ENTRY(IDataObject)
	COM_INTERFACE_ENTRY(IProvideClassInfo)
	COM_INTERFACE_ENTRY(IProvideClassInfo2)
	COM_INTERFACE_ENTRY(IPerPropertyBrowsing)
END_COM_MAP()

BEGIN_PROP_MAP(CSplitter)
	PROP_DATA_ENTRY("_cx", m_sizeExtent.cx, VT_UI4)
	PROP_DATA_ENTRY("_cy", m_sizeExtent.cy, VT_UI4)
	PROP_ENTRY("SplitterIsVertical", 2, CLSID_SplitterPropPage)
	PROP_ENTRY("FirstControlName", DISPID_FIRST_CONTROL_NAME, CLSID_SplitterPropPage)
	PROP_ENTRY("SecondControlName", DISPID_SECOND_CONTROL_NAME, CLSID_SplitterPropPage)

	// Example entries
	// PROP_ENTRY("Property Description", dispid, clsid)
	// PROP_PAGE(CLSID_StockColorPage)
END_PROP_MAP()

BEGIN_CONNECTION_POINT_MAP(CSplitter)
	CONNECTION_POINT_ENTRY(IID_IPropertyNotifySink)
END_CONNECTION_POINT_MAP()

BEGIN_MSG_MAP(CSplitter)
	CHAIN_MSG_MAP(CComControl<CSplitter>)
	DEFAULT_REFLECTION_HANDLER()
	MESSAGE_HANDLER(WM_LBUTTONDOWN, OnLButtonDown)
	MESSAGE_HANDLER(WM_LBUTTONUP, OnLButtonUP)
	MESSAGE_HANDLER(WM_MOUSEMOVE, OnMouseMove)
	MESSAGE_HANDLER(WM_SETCURSOR, OnSetCursor)
END_MSG_MAP()
// Handler prototypes:
//  LRESULT MessageHandler(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
//  LRESULT CommandHandler(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL& bHandled);
//  LRESULT NotifyHandler(int idCtrl, LPNMHDR pnmh, BOOL& bHandled);



// ISupportsErrorInfo
	STDMETHOD(InterfaceSupportsErrorInfo)(REFIID riid);

// IViewObjectEx
	DECLARE_VIEW_STATUS(VIEWSTATUS_SOLIDBKGND | VIEWSTATUS_OPAQUE)

// IOleControl
	STDMETHOD(OnAmbientPropertyChange)(DISPID dispid);

// IPerPropertyBrowsingImpl
	STDMETHOD(GetPredefinedStrings)(DISPID dispID, CALPOLESTR *pCaStringsOut,CADWORD *pCaCookiesOut);
	STDMETHOD(GetPredefinedValue)(DISPID /*dispID*/, DWORD /*dwCookie*/, VARIANT* /*pVarOut*/);

//IOleInPlaceObjectWindowlessImpl
	STDMETHOD(SetObjectRects)(LPCRECT prcPos,LPCRECT prcClip);
	

// ISplitter
public:
	STDMETHOD(get_SplitterPercentPosition)(/*[out, retval]*/ float *pVal);
	STDMETHOD(put_SplitterPercentPosition)(/*[in]*/ float newVal);
	STDMETHOD(get_SecondControlName)(/*[out, retval]*/ BSTR *pVal);
	STDMETHOD(put_SecondControlName)(/*[in]*/ BSTR newVal);
	STDMETHOD(get_FirstControlName)(/*[out, retval]*/ BSTR *pVal);
	STDMETHOD(put_FirstControlName)(/*[in]*/ BSTR newVal);
	STDMETHOD(get_SplitterIsVertical)(/*[out, retval]*/ BOOL *pVal);
	STDMETHOD(put_SplitterIsVertical)(/*[in]*/ BOOL newVal);

	HRESULT OnDraw(ATL_DRAWINFO& di);
	LRESULT OnLButtonDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
	LRESULT OnLButtonUP(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
	LRESULT OnMouseMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
	LRESULT OnSetCursor(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
};




#endif //__SPLITTER_H_