Abstract Factory模式

 

int main() {      CustomDialog* pDialog = new CustomDialog(new WindowsWidgetFactory());      pDialog->ShowDialog();        CustomDialog* pMacDialog = new CustomDialog(new MacWidgetFactory());      pMacDialog->ShowDialog(); }   public CustomDialog { public:     CustomDialog(IWidgetFactory* pFactory)     {         this->SetWidgetFactory(pFactory);     }     void SetWidgetFactory(IWidgetFactory* pFactory)     {         this->SetButton(pFactory->GetButton());         this->SetTextField(pFactory->GetTextField());     }     void SetButton(IButton* pButton)     {         m_pButton = pButton;     }     void SetTextField(ITextField* pText)     {         m_pTextField = pText;     }     ...     void ShowDialog(){} private:     IButton*  m_pButton;     ITextField* m_pTextField; }

在Abstract Factory模式中将具体的Product封装在具体Factory实现中，而客户仍只要面对Factory与Product的抽象介面，避免依赖于具体的Factory与Product，由于Factory封装了所必须的Product，所以要更换掉所有的元件，只要简单的抽换掉Factory就可以了，不用修改客户端的程式。