【移动应用开发技术】桥接模式

【移动应用开发技术】桥接模式

在提出桥梁模式的时候指出，桥梁模式的用意是"将抽象化(Abstraction)与实现化(Implementation)脱耦，使得二者可以独立地变化"。这句话有三个关键词，也就是抽象化、实现化和脱耦。抽象化实现化脱耦将两个角色之间的继承关系改为聚合关系，就是将它们之间的强关联改换成为弱关联。因此，桥梁模式中的所谓脱耦，就是指在一个软件系统的抽象化和实现化之间使用组合/聚合关系而不是继承关系，从而使两者可以相对独立地变化。这就是桥梁模式的用意。在使用VIM编写makefile时，有时TAP键会是八个空格，使用setlist命令可以查看所有的TAB键是否正确。makefile文件aLL:Brige

CC=g++

INCLUDE=.

CFLAGS=-g-Wall

Brige:main.oCDrawLine.oCDrawSquare.oCSqureRefined.oCCircleRefined.o

$(CC)-oBrigemain.oCDrawLine.oCDrawSquare.oCSqureRefined.oCCircleRefined.o

CDrawSquare.o:CDrawSquare.cppCDrawSquare.hCImplement.cpp

$(CC)-I$(INCLUDE)$(CFLAGS)-cCDrawSquare.cpp

CDrawLine.o:CDrawLine.cppCDrawLine.h

$(CC)-I$(INCLUDE)$(CFLAGS)-cCDrawLine.cpp

CSqureRefined.o:CSqureRefined.cppCSqureRefined.h

$(CC)-I$(INCLUDE)$(CFLAGS)-cCSqureRefined.cpp

CCircleRefined.o:CCircleRefined.cppCCircleRefined.h

$(CC)-I$(INCLUDE)$(CFLAGS)-cCCircleRefined.cpp

main.o:main.cpp

$(CC)-I$(INCLUDE)$(CFLAGS)-cmain.cpp

clean:

rm*.o

rmBrigeCAbstraction.h#ifndefCAbstractiongH

#defineCAbstractiongH

#include<iostream>

#include"CImplement.h"

usingnamespacestd;

classCAbstractiong

{

public:

virtual~CAbstractiong(){};

virtualvoidOperation()=0;

voidSetImplement(CImplement*tImplement){m_CImplement=tImplement;};

protected:

CAbstractiong(){};

CImplement*m_CImplement;

};

#endifCCircleRefined#ifndefCCircleRefinedH

#defineCCircleRefinedH

#include"CAbstraction.h"

classCCircleRefined:publicCAbstractiong

{

public:

CCircleRefined(){};

~CCircleRefined(){};

voidOperation();

};

#endif

#include"CCircleRefined.h"

voidCCircleRefined::Operation()

{

cout<<"对圆形进行了"<<m_CImplement->Operation()<<endl;

}CSqureRefined#ifndefCSqureRefinedH

#defineCSqureRefinedH

#include"CAbstraction.h"

classCSqureRefined:publicCAbstractiong

{

public:

CSqureRefined(){};

~CSqureRefined(){};

voidOperation();

};

#endif

#include"CSqureRefined.h"

voidCSqureRefined::Operation()

{

cout<<"对正方形进行了"<<m_CImplement->Operation()<<endl;

}CAbstractiong#ifndefCAbstractiongH

#defineCAbstractiongH

#include<iostream>

#include"CImplement.h"

usingnamespacestd;

classCAbstractiong

{

public:

virtual~CAbstractiong(){};

virtualvoidOperation()=0;

voidSetImplement(CImplement*tImplement){m_CImplement=tImplement;};

protected:

CAbstractiong(){};

CImplement*m_CImplement;

};

#endifCDrawSquare#ifndefCDrawSquareH

#defineCDrawSquareH

#include<iostream>

#include"CImplement.h"

classCDrawSquare:publicCImplement

{

public:

CDrawSquare(){};

~CDrawSquare(){};

stringOperation();

};

#endif

#include"CDrawSquare.h"

#include<iostream>

usingnamespacestd;

stringCDrawSquare::Operation()

{

stringsTemp="进行了画方格操作";

returnsTemp;

}CDrawLine#ifndefCDrawLineH

#defineCDrawLineH

#include<iostream>

#include<string>

#include"CImplement.h"

classCDrawLine:publicCImplement

{

public:

CDrawLine(){};

~CDrawLine(){};

stringOperation();

};

#endif

#include"CDrawLine.h"

#include<iostream>

usingnamespacestd;

stringCDrawLine::Operation()

{

stringsTemp="进行了画线操作";

returnsTemp;

}main.cpp#include"CDrawLine.h"

#include"CDrawSquare.h"

#include"CSqureRefined.h"

#include"CCircleRefined.h"

intmain()

{

CDrawLine*pCDrawLine=newCDrawLine();

CCircleRefined*pCCircleRefined=newCCircleRefined();

pCCircleRefined->SetImplement(pCDra