TnbMfcRgnControl.h

[詳解]

#pragma once
#include "TnbMfcCommon.h"
 
 
 
//TNB Library
namespace TNB {
namespace MFC {
 
 
 
template<typename WND = CWnd>
class CRgnControlAddinT : public WND
{
    DEFSUPER(WND);
protected:
 
    HRGN            m_clientRgn;        
 
    void DeleteClientRgnHandle(void)
    {
        ::SetWindowRgn(m_hWnd, NULL, FALSE);
        if ( m_clientRgn != NULL )
        {
            _DeleteObject(m_clientRgn);
            m_clientRgn = NULL;
        }
    }
 
    virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
    {
        switch ( message )
        {
        case WM_PRINT:
            {
                HDC dc = reinterpret_cast<HDC>(wParam);
                if ( m_clientRgn != NULL )
                {
                    HRGN rgn = ::CreateRectRgn(0, 0, 0, 0);
                    CPoint po = MFCLIB::GetClientPoint(this);
                    ::CombineRgn(rgn, m_clientRgn, NULL, RGN_COPY);
                    ::OffsetRgn(rgn, po.x, po.y);
                    ::SelectClipRgn(dc, rgn);
                    LRESULT r = _super::WindowProc(message, wParam, lParam);
                    _DeleteObject(rgn);
                    return r;
                }
            }
            break;
#ifndef _WIN32_WCE
        case WM_NCPAINT:
            if ( m_clientRgn != NULL )
            {
                wParam = reinterpret_cast<WPARAM>(m_clientRgn);
            }
            break;
#endif
        case WM_DESTROY:
            DeleteClientRgnHandle();
            break;
        }
        return _super::WindowProc(message, wParam, lParam);
    }
 
public:
 
    CRgnControlAddinT(void) : m_clientRgn(NULL)
    {
    }
 
    virtual ~CRgnControlAddinT(void)
    {
        DeleteClientRgnHandle();
    }
 
    bool SetClientRgn(HRGN rgn)
    {
        DeleteClientRgnHandle();
        m_clientRgn = ::CreateRectRgn(0, 0, 0, 0);
        ::CombineRgn(m_clientRgn, rgn, NULL, RGN_COPY);
        bool r = !! ::SetWindowRgn(m_hWnd, rgn, TRUE);
        if ( ! r )
        {
            DeleteClientRgnHandle();
        }
        return r;
    }
};
 
 
 
}; //MFC
}; //TNB