关于c++:DuiLib-HandleMessage-HandleCustomMessage-MessageHandler

HandleMessage HandleCustomMessage MessageHandler 三者区别

LRESULT CWindowWnd::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam){    return ::CallWindowProc(m_OldWndProc, m_hWnd, uMsg, wParam, lParam);}

LRESULT WindowImplBase::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam){    lRes = HandleCustomMessage(uMsg, wParam, lParam, bHandled);    if (bHandled) return lRes;    if (m_PaintManager.MessageHandler(uMsg, wParam, lParam, lRes))        return lRes;    return CWindowWnd::HandleMessage(uMsg, wParam, lParam);}

//CWindowWnd是父类，WindowImplBase是子类class UILIB_API WindowImplBase : public CWindowWnd如果派生类 如果实现这些虚函数 执行程序如下：HandleMessage --> HandleCustomMessage --> MessageHandler因而只有实现HandleCustomMessage即可