www.pudn.com > BitMapToolBar.rar > PictureWindow.h

/************************************ 
  REVISION LOG ENTRY 
  Revision By: Mihai Filimon  
  Revised on 11/24/99 9:45:45 AM 
  Comments: PictureWindow.h: interface for the CPictureWindow class. 
 ************************************/ 
 
#if !defined(AFX_PICTUREWINDOW_H__44323373_9E89_11D3_A393_00C0DFC59237__INCLUDED_) 
#define AFX_PICTUREWINDOW_H__44323373_9E89_11D3_A393_00C0DFC59237__INCLUDED_ 
 
#if _MSC_VER > 1000 
#pragma once 
#endif // _MSC_VER > 1000 
 
#include  
#include  
 
class CPictureWindow  : public CWindowImpl 
{ 
public: 
	typedef enum HandlerTypeEnum 
	{ 
		ClientPaint = WM_PAINT, 
		BackGroundPaint = WM_ERASEBKGND 
	} HandlerTypeEnum; 
 
	CPictureWindow() 
	{ 
		m_nMessageHandler = ClientPaint; 
	}; 
	virtual ~CPictureWindow() 
	{ 
	}; 
 
	BEGIN_MSG_MAP(CPictureWindow) 
		MESSAGE_HANDLER(WM_PAINT, OnPaint) 
		MESSAGE_HANDLER(WM_ERASEBKGND, OnEraseBkGnd) 
	END_MSG_MAP() 
 
	// Function name	: Load 
	// Description	    : Loads the picture into memory, and then display it! 
	// Return type		: virtual BOOL  
	// Argument         : LPCTSTR szFileName 
	virtual BOOL Load( LPCTSTR szFileName ) 
	{ 
		BOOL bResult = FALSE; 
		Close(); 
		if ( szFileName ) 
		{ 
			OFSTRUCT of; 
			HANDLE hFile = NULL;; 
			if ( (hFile = (HANDLE)OpenFile( szFileName, &of, OF_READ | OF_SHARE_COMPAT)) != (HANDLE)HFILE_ERROR ) 
			{ 
				DWORD dwHighWord = NULL, dwSizeLow = GetFileSize( hFile, &dwHighWord ); 
				DWORD dwFileSize = dwSizeLow; 
				HRESULT hResult = NULL; 
				if ( HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize) ) 
					if ( void* pvData = GlobalLock( hGlobal ) ) 
					{ 
						DWORD dwReadBytes = NULL; 
						BOOL bRead = ReadFile( hFile, pvData, dwFileSize, &dwReadBytes, NULL ); 
						GlobalUnlock( hGlobal ); 
						if ( bRead ) 
						{ 
							CComPtr spStream; 
							_ASSERTE( dwFileSize == dwReadBytes ); 
							if ( SUCCEEDED( CreateStreamOnHGlobal( hGlobal, TRUE, &spStream) ) ) 
								if ( SUCCEEDED( hResult = OleLoadPicture( spStream, 0, FALSE, IID_IPicture, (void**)&m_spPicture ) ) ) 
									bResult = TRUE; 
						} 
					} 
				CloseHandle( hFile ); 
			} 
		} 
		Invalidate(); 
		return bResult; 
	} 
 
	HandlerTypeEnum m_nMessageHandler; 
 
protected: 
 
	inline virtual BOOL IsHandlerMessage( UINT uMsg ) 
	{ 
		return m_nMessageHandler == (HandlerTypeEnum)uMsg ; 
	} 
 
	void PutPicture( IPicture* pPicture, HDC hDC, RECT rPicture ) 
	{ 
		OLE_XSIZE_HIMETRIC nWidth = NULL; OLE_YSIZE_HIMETRIC nHeight = NULL; 
		pPicture->get_Width( &nWidth ); pPicture->get_Height( &nHeight ); 
		pPicture->Render( hDC, rPicture.left ,rPicture.top, rPicture.right - rPicture.left, rPicture.bottom - rPicture.top, 0, nHeight, nWidth, -nHeight, NULL ); 
	}; 
 
	LRESULT OnEraseBkGnd(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled) 
	{ 
		if ( IsHandlerMessage( uMsg ) ) 
		{ 
			if ( m_spPicture ) 
			{ 
				BeginPaint( NULL ); 
					RECT r ; GetClientRect( &r ); 
					HDC hDC = GetDC(); 
					HWND hWndChild = GetWindow( GW_CHILD ); 
					while ( ::IsWindow( hWndChild ) ) 
					{ 
						if ( ::IsWindowVisible( hWndChild ) ) 
						{ 
							RECT rChild; ::GetWindowRect( hWndChild, &rChild ); 
							ScreenToClient( &rChild ); 
							ExcludeClipRect( hDC, rChild.left, rChild.top, rChild.right, rChild.bottom ); 
						} 
						hWndChild = ::GetWindow( hWndChild, GW_HWNDNEXT ); 
					} 
					PutPicture( m_spPicture, hDC, r ); 
					ReleaseDC( hDC ); 
				EndPaint( NULL ); 
				return TRUE; 
			} 
		} 
		bHandled = FALSE; 
		return FALSE; 
	}; 
 
	LRESULT OnPaint(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled) 
	{ 
		if ( IsHandlerMessage( uMsg ) ) 
		{ 
			if ( m_spPicture ) 
			{ 
				BeginPaint( NULL ); 
				RECT r ; GetClientRect( &r ); 
				HDC hDC = GetDC(); 
				PutPicture( m_spPicture, hDC, r ); 
				ReleaseDC( hDC ); 
				EndPaint( NULL ); 
			} 
		} 
		bHandled = FALSE; 
		return NULL; 
	}; 
 
	void Close() 
	{ 
		m_spPicture = NULL; 
	} 
 
	//Attributes 
	CComPtr m_spPicture; 
}; 
 
#endif // !defined(AFX_PICTUREWINDOW_H__44323373_9E89_11D3_A393_00C0DFC59237__INCLUDED_)