TnbMfcSetText.h

[詳解]

#pragma once
#include "TnbMfcCommon.h"
 
 
 
//TNB Library
namespace TNB {
namespace MFC {
 
 
 
template<typename WND = CStatic>
class CSetTextAddinT : public WND
{
    DEFSUPER(WND);
public:
    
    CSetTextAddinT(void) : m_postCount(0), m_isValid(false)
    {
    }
 
    void SetWindowText(LPCTSTR lpszString)
    {
        if ( ::IsWindow(m_hWnd) && m_isValid )
        {
            TTRACE2("SetWindowText tid = %X, %X\n", m_mainThreadId, ::GetCurrentThreadId());
            if ( m_mainThreadId != ::GetCurrentThreadId() )
            {
                CString* P = new CString(lpszString);
                m_postCount++;
                if ( ! _super::PostMessage(WM_TNB_POSTTEXT, 0, reinterpret_cast<LPARAM>(P)) )
                {
                    delete P;
                    m_postCount--;
                }
                return;
            }
            _super::SetWindowText(lpszString);
        }
    }
 
protected:
 
    virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
    {
        switch ( message )
        {
        case WM_TNB_POSTTEXT:
            {
                CString* P = reinterpret_cast<CString*>(lParam);
                if ( ::IsWindow(m_hWnd) )
                {
                    _super::SetWindowText(P->operator LPCTSTR());
                }
                delete P;
                m_postCount--;
                return 0;
            }
            break;
        case WM_DESTROY:
            {
                MSG msg;
                m_isValid = false;
                while ( ::PeekMessage(&msg, m_hWnd, WM_TNB_POSTTEXT, WM_TNB_POSTTEXT, PM_REMOVE) )
                {
                    if ( msg.message == WM_TNB_POSTTEXT )
                    {
                        CString* P = reinterpret_cast<CString*>(msg.lParam);
                        delete P;
                        m_postCount--;
                    }
                }
                ASSERT( m_postCount == 0 );
            }
            break;
        }
        return _super::WindowProc(message, wParam, lParam);
    }
 
    virtual void PreSubclassWindow(void)
    {
        m_isValid = true;
        m_mainThreadId = ::GetCurrentThreadId();
        _super::PreSubclassWindow();
    }
 
private:
    enum { WM_TNB_POSTTEXT = WM_APP };
    size_t          m_postCount;        
    DWORD           m_mainThreadId;     
    bool            m_isValid;          
};
 
 
 
}; // MFC
}; // TNB