TnbMfcBitmapDC.h

[詳解]

#pragma once
#include "TnbBitmapImage.h"
 
 
 
//TNB Library
namespace TNB {
namespace MFC {
 
 
 
class CBitmapDC : public CDC
{
    DEFSUPER(CDC);
public:
 
    explicit CBitmapDC(CBitmapImage* pBI) : m_pBitImg(pBI)
    {
        if ( m_pBitImg != NULL && _super::Attach(m_pBitImg->GetDC()) )
        {
        }
        else
        {
            TRACE0(" CBitmapDC 有効でない CBItmapImage を指定しました。\n" );
            AfxThrowResourceException();
        }
    }
 
    explicit CBitmapDC(void) : m_pBitImg(NULL)
    {
    }
 
    virtual ~CBitmapDC(void)
    {
        Detach();
    }
 
    bool Draw(HDC dc, int x = 0, int y = 0) const
    {
        if ( m_pBitImg != NULL )
        {   
            const SIZE& size = m_pBitImg->GetSize();
            return !! ::BitBlt(dc, x, y, size.cx, size.cy, *this, 0, 0, SRCCOPY);
        }
        return false;
    }
 
    bool Attach(CBitmapImage* pBI)
    {
        Detach();
        if ( pBI != NULL && _super::Attach(pBI->GetDC()) )
        {
            m_pBitImg = pBI;
            return true;
        }
        return false;
    }
 
    CBitmapImage* Detach(void)
    {
        CBitmapImage* P = m_pBitImg;
        _super::Detach();
        if ( m_pBitImg != NULL )
        {
            m_pBitImg->ReleaseDC();
        }
        m_pBitImg = NULL;
        return P;
    }
 
private:
    CBitmapImage*   m_pBitImg;  
};
 
 
 
}; //MFC
}; //TNB