oop_decorating

#include <iostream>;
using namespace std;

class Win {
public:
    virtual void draw() = 0;
    virtual ~Win() { cout<<"Win deleted!\n"; }
};

class TextWin: public Win {
private:
    int width, height;
public:
    TextWin( int width, int height):width(width), height(height) {}
    void draw() {
        cout <<"TextWin: "<< width <<", "<< height << endl;
    }
};

class Decorator: public Win {
private:
    Win* window;
public:
    Decorator( Win* window ):window(window) {}
    void draw() {
        window->draw();
    }
    ~Decorator() { delete window; cout<<"Decorator deleted! "; }
};

class BorderDecorator: public Decorator {
public:
    BorderDecorator( Win* window ): Decorator( window ) {}
    void draw() {
        cout << "Bordered ";
        Decorator::draw();
    }
    ~BorderDecorator() { cout<<"BorderDecorator deleted! "; }
};

class ScrollDecorator: public Decorator {
public:
    ScrollDecorator( Win* window ): Decorator( window ) {}
    void draw() {
        cout << "Scrolled ";
        Decorator::draw();
    }
    ~ScrollDecorator() { cout<<"ScrollDecorator deleted! "; }
};

int main() {
    Win * a = new TextWin( 80, 15 ),
        * b = new BorderDecorator( new TextWin(60,25)),
        * c = new ScrollDecorator( new TextWin(70,24)),
        * d = new BorderDecorator( new ScrollDecorator( new TextWin(80,243)));
    a->draw();
    b->draw();
    c->draw();
    d->draw();
    cout <<"deleting a:\n"; delete a;
    cout <<"deleting b:\n"; delete b;
    cout <<"deleting c:\n"; delete c;
    cout <<"deleting d:\n"; delete d;

    system("PAUSE");
    return EXIT_SUCCESS;
}