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 the way to use layout styles within the object-oriented improvement method, tips on how to remedy particular layout difficulties utilizing styles, and achieve a typical vocabulary for object-oriented layout.

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A WYSIWYG representation of the document occupies the large rectangular area in the center. The document can mix text and graphics freely in a variety of formatting styles. Surrounding the document are the usual pull-down menus and scroll bars, plus a collection of page icons for jumping to a particular page in the document. 1: Lexi's user interface Página 36 de 358 Design Patterns Design Problems We will examine seven problems in Lexi's design: 1. Document structure. The choice of internal representation for the document affects nearly every aspect of Lexi's design.

7: MonoGlyph class relationships MonoGlyph subclasses reimplement at least one of these forwarding operations. Border::Draw, for instance, first invokes the parent class operation MonoGlyph::Draw on the component to let the component do its part— that is, draw everything but the border. Then Border::Draw draws the border by calling a private operation called DrawBorder, the details of which we'll omit: void Border::Draw (Window* w) { MonoGlyph::Draw(w); DrawBorder(w); } Notice how Border::Draw effectively extends the parent class operation to draw the border.

The key participants in the pattern are Strategy objects (which encapsulate different algorithms) and the context in which they operate. Compositors are strategies; they encapsulate different formatting algorithms. A composition is the context for a compositor strategy. The key to applying the Strategy pattern is designing interfaces for the strategy and its context that are general enough to support a range of algorithms. You shouldn't have to change the strategy or context interface to support a new algorithm.

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