decorator
TRANSCRIPT
DECORATOR
НАЗНАЧЕНИЕ
Динамически порождает объекты
СТРУКТУРА
РЕАЛИЗАЦИЯ
ABSTRACT CLASS COMPONENT
{
PUBLIC ABSTRACT VOID DRAW();
}
РЕАЛИЗАЦИЯ
CLASS CONCRETECOMPONENT : COMPONENT
{
PUBLIC OVERRIDE VOID DRAW()
{
}
}
РЕАЛИЗАЦИЯABSTRACT CLASS DECORATOR : COMPONENT
{
PROTECTED COMPONENT COMPONENT;
PUBLIC VOID SETCOMPONENT(COMPONENT COMPONENT)
{
THIS.COMPONENT = COMPONENT;
}
PUBLIC OVERRIDE VOID DRAW()
{
IF (COMPONENT != NULL)
{
COMPONENT.DRAW();
}
}
}
РЕАЛИЗАЦИЯCLASS SCROLLDECORATOR : DECORATOR
{
PUBLIC OVERRIDE VOID DRAW()
{
BASE.DRAW();
SCROLLTO();
}
PRIVATE VOID SCROLLTO()
{
}
}
РЕАЛИЗАЦИЯCLASS BORDERDECORATOR : DECORATOR
{
PUBLIC OVERRIDE VOID DRAW()
{
BASE.DRAW();
DRAWBORDER();
}
PRIVATE VOID DRAWBORDER()
{
}
}
РЕАЛИЗАЦИЯ// CREATE CONCRETECOMPONENT AND TWO DECORATORS
CONCRETECOMPONENT TEXTVIEW = NEW CONCRETECOMPONENT();
SCROLLDECORATOR SCROLLDECORATOR = NEW SCROLLDECORATOR();
BORDERDECORATOR BORDERDECORATOR = NEW BORDERDECORATOR();
// LINK DECORATORS
SCROLLDECORATOR.SETCOMPONENT(TEXTVIEW);
BORDERDECORATOR.SETCOMPONENT(SCROLLDECORATOR);
SCROLLDECORATOR.DRAW();
BORDERDECORATOR.DRAW();