计算机软件技术基础_CH_软件设计_-公开课件.ppt

* Class MacroCommand : public Command{ public: MacroCommand(); virtual ~MacroCommand(); virtual void Add(Command *); virtual void Remove(Command *); virtual void Execute(); private: List Command ** _cmds; }; MacroCommand ::Execute(){ ListIteratorCommand*i(_cmds); for(i.First();i.IsDone();i.Next()){ Command *c=i.CurrentItem(); c-Execute(); } } * CMyApp::InitInstance() { MyClass *receiver=new MyClass; Command * aCommand= new SimpleCommandMyClass(receiver,MyClass::Action); Application * app; Command * oCommand=new OpenCommand(app); Document * doc; Command * pCommand=new PasteCommand(doc); Command * mCommand=new MacroCommand; CMyDlg myDlg; myDlg.StoreCommand(aCommand); myDlg.StoreCommand(oCommand); myDlg.StoreCommand(pCommand); myDlg.StoreCommand(mCommand); } * CMyDlg:: OnCommand() { aCommand-Execute(); oCommand-Execute(); pCommand-Execute(); mCommand-Execute(); } * Command virtual void Execute(); OpenCommand virtual void Execute(); PasteCommand virtual void Execute(); SimpleCommandMyClass virtual void Execute(); MacroCommand virtual void Execute(); CMyDlg StoreCommand(); CMyApp InitInstance(); Application Add(); Document Open(); Paste(); MyClass Action(); aComand,oComand,etc. _application _document _receiver _action List _cmds 几种行为设计模式-INTERPRETER * BooleanExp::=VariableExp|Constant|OrExp|AndExp|NotExp| BooleanExp AndExp::= BooleanExp ‘and’ BooleanExp OrExp::= BooleanExp ‘or’ BooleanExp NotExp::=‘not’ BooleanExp Constant::=‘true’ | ‘false’; VariableExp::= ‘A’ | ‘B’ … | ‘X’ | ‘Y’ | ‘Z’ * Class BooleanExp{ public: BooleanExp(); virtual ~ BooleanExp(); virtual bool Evaluate(Context)=0; virtual BooleanExp* Replace(const char*,BooleanExp)=0; virtual BooleanExp* Copy() const=0; }; * Class Context{ public: bool Lookup(const char*) const; void Assign(VariableExp*,bool); }; * Class VariableExp:public BooleanExp{ public: VariableExp(const char*); virtual ~VariableExp(); virtual bool Evaluate(Context); virtual BooleanExp*