IE Drop-Down Button

// DropButtonBHO.h : Declaration of the CDropButtonBHO

#pragma once
#include "resource.h"       // main symbols

#include <ShlGuid.h>
#include <exdispid.h>
#include <mshtml.h>
#include <atlrx.h>
#include <Objsafe.h>

#include "DropButton.h"


#if defined(_WIN32_WCE) && !defined(_CE_DCOM) && !defined(_CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA)
#error "Single-threaded COM objects are not properly supported on Windows CE platform, such as the Windows Mobile platforms that do not include full DCOM support. Define _CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA to force ATL to support creating single-thread COM object's and allow use of it's single-threaded COM object implementations. The threading model in your rgs file was set to 'Free' as that is the only threading model supported in non DCOM Windows CE platforms."
#endif



// ����״̬�ı��־��
#define DISPID_WINDOWSTATECHANGED 283 

// ����״̬����
typedef enum
{
	OLECMDIDF_WINDOWSTATE_USERVISIBLE        = 0x00000001,
	OLECMDIDF_WINDOWSTATE_ENABLED            = 0x00000002,
	OLECMDIDF_WINDOWSTATE_USERVISIBLE_VALID  = 0x00010000,
	OLECMDIDF_WINDOWSTATE_ENABLED_VALID      = 0x00020000,
} OLECMDID_WINDOWSTATE_FLAG;


// CDropButtonBHO

class ATL_NO_VTABLE CDropButtonBHO :
	public CComObjectRootEx<CComSingleThreadModel>,
	public CComCoClass<CDropButtonBHO, &CLSID_DropButtonBHO>,
	public IObjectWithSiteImpl<CDropButtonBHO>,
	public IDispatchImpl<IDropButtonBHO, &IID_IDropButtonBHO, &LIBID_DropButtonLib, /*wMajor =*/ 1, /*wMinor =*/ 0>,
	public IDispEventImpl<1, CDropButtonBHO, &DIID_DWebBrowserEvents2, &LIBID_SHDocVw, 1, 1>,
	public IObjectSafety
{
public:
	CDropButtonBHO();

	DECLARE_REGISTRY_RESOURCEID(IDR_DROPBUTTONBHO)

	// Message Map
	BEGIN_COM_MAP(CDropButtonBHO)
		COM_INTERFACE_ENTRY(IDropButtonBHO)
		COM_INTERFACE_ENTRY(IDispatch)
		COM_INTERFACE_ENTRY(IObjectWithSite)
		COM_INTERFACE_ENTRY(IObjectSafety)
	END_COM_MAP()

	BEGIN_SINK_MAP(CDropButtonBHO)
		SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOCUMENTCOMPLETE, OnDocumentComplete)
		SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_BEFORENAVIGATE2, OnBeforeNavigate2)
		SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOWNLOADBEGIN, OnDownloadBegin)
		SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOWNLOADCOMPLETE, OnDownloadComplete)
		SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_PROGRESSCHANGE, OnProgressChange)
		SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_WINDOWSTATECHANGED, OnWindowStateChanged)
	END_SINK_MAP()

	DECLARE_PROTECT_FINAL_CONSTRUCT()

	// IObjectSafety implementation
	STDMETHODIMP GetInterfaceSafetyOptions(REFIID riid, DWORD *pdwSupportedOptions, DWORD *pdwEnabledOptions)
	{
		ATLTRACE(_T("CDropButtonBHO::GetInterfaceSafetyOptions()\n"));
		*pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
		*pdwEnabledOptions = *pdwSupportedOptions;
		return S_OK;
	}

	STDMETHODIMP SetInterfaceSafetyOptions(REFIID riid, DWORD dwOptionSetMask, DWORD dwEnabledOptions)
	{
		ATLTRACE(_T("CDropButtonBHO::SetInterfaceSafetyOptions\n"));
		return S_OK;
	}


	HRESULT FinalConstruct()
	{
		return S_OK;
	}

	void FinalRelease()
	{
	}


public:
	STDMETHOD(SetSite)(IUnknown *pUnkSite);

	void STDMETHODCALLTYPE OnDocumentComplete(IDispatch *pDisp, VARIANT *pvarURL);

	void STDMETHODCALLTYPE OnBeforeNavigate2( IDispatch *pDisp, VARIANT &url,
		VARIANT &Flags, VARIANT &TargetFrameName,
		VARIANT &PostData, VARIANT &Headers,
		VARIANT_BOOL *Cancel);

	void STDMETHODCALLTYPE OnDownloadBegin();

	void STDMETHODCALLTYPE OnDownloadComplete();

	void STDMETHODCALLTYPE OnWindowStateChanged(DWORD dwFlags, DWORD dwValidFlagsMask);

	void STDMETHODCALLTYPE OnProgressChange(long nProgress, long nProgressMax);

private:
	CComPtr<IWebBrowser2> m_spWebBrowser;
	BOOL m_fAdvised;
	BOOL m_isIE7; 
private:
	BOOL CheckIEVersion(); 
};

OBJECT_ENTRY_AUTO(__uuidof(DropButtonBHO), CDropButtonBHO)