TnbMfcThroughDropFilesMessage.h

[詳解]

#pragma once
#include "TnbMfcCommon.h"
 
 
 
//TNB Library
namespace TNB {
namespace MFC {
 
 
 
template<typename TYP = CStatic>
class CThroughDropFilesMessageAddinT : public TYP
{
    DEFSUPER(TYP);
public:
 
    CThroughDropFilesMessageAddinT(void) : m_isDroped(false)
    {
    }
 
    bool IsDroped(void) const
    {
        return m_isDroped;
    }
 
    static size_t QueryDragFileCount(HDROP hDrop)
    {
        return ::DragQueryFile(hDrop, 0xFFFFFFFF, NULL, 0);
    }
 
    static CStr QueryDragFileName(HDROP hDrop, INDEX index)
    {
        CStr s;
        size_t count =QueryDragFileCount(hDrop);
        if ( count > index )
        {
            ::DragQueryFile(hDrop, index, s.GetBuffer(MAX_PATH), MAX_PATH);
            s.ReleaseBuffer();
        }
        return s;
    }
 
protected:
 
    virtual void PreSubclassWindow(void)
    {
        m_isDroped = false;
        ::DragAcceptFiles(_super::GetSafeHwnd(), TRUE);
        _super::PreSubclassWindow();
    }
 
    virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
    {
        if ( message == WM_DROPFILES )
        {
            CWnd* P = _super::GetParent();
            if ( P != NULL )
            {
                m_isDroped = true;
                LRESULT r = P->SendMessage(message, wParam, lParam);
                m_isDroped = false;
                return r;
            }
        }
        return _super::WindowProc(message, wParam, lParam);
    }
private:
    bool    m_isDroped; 
};
 
 
 
}; //MFC
}; //TNB