Download Design Patterns: Elements of Reusable Object-Oriented by Erich Gamma, Richard Helm, Ralph Johnson, John M. Vlissides PDF

By Erich Gamma, Richard Helm, Ralph Johnson, John M. Vlissides

4 top-notch authors current the 1st booklet containing a catalog of object-oriented layout styles. Readers will tips on how to use layout styles within the object-oriented improvement method, the way to clear up particular layout difficulties utilizing styles, and achieve a standard vocabulary for object-oriented layout.

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The Window base class constructor can use the WindowSystemFactory interface to initialize the _imp member with the WindowImp that's right for the window system: Window::Window () { _imp = windowSystemFactory->CreateWindowImp(); } The windowSystemFactory variable is a well-known instance of a WindowSystemFactory subclass, akin to the well-known guiFactory variable defining the look and feel. The windowSystemFactory variable can be initialized in the same way. Bridge Pattern The WindowImp class defines an interface to common window system facilities, but its design is driven by different constraints than Window's interface.

Application programmers won't deal with WindowImp's interface directly; they only deal with Window objects. So WindowImp's interface needn't match the application Pag 57 de 358 Gamma – Helm - Johnson – Vlissides programmer's view of the world, as was our concern in the design of the Window class hierarchy and interface. WindowImp's interface can more closely reflect what window systems actually provide, warts and all. It can be biased toward either an intersection or a union of functionality approach, whichever suits the target window systems best.

So we can define subclasses like ApplicationWindow, IconWindow, and DialogWindow to capture these differences. The resulting class hierarchy gives applications like Lexi a uniform and intuitive windowing abstraction, one that doesn't depend on any particular vendor's window system: Now that we've defined a window interface for Lexi to work with, where does the real platform-specific window come in? If we're not implementing our own window system, then at some point our window abstraction must be implemented in terms of what the target window system provides.

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