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DejaVU
Online:
-- The OO Lectures
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Motivation
Take for example a document processing system ...
material - words, images, tables
formatting, layout
online presentation and editing tool
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Document processing
Managing composites
Problem: very many items
Solution: flyweight class
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Composite ...
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Composite
Managing layout and formatting
Problem: many algorithms
Solution: composer (strategy) class
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Strategy ...
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Strategy
Display item with attributes
Problem: non-uniform attributes
Solution: embed and hide attributes
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Decorate ...
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Decorator
Develop multi-platform tools (1)
Problem: different window toolkits
Solution: employ platform-specific factories
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Factory ...
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Factory
Develop multi-platform tools (2)
Problem: offer uniform widget hierarchy
Solution: separate interface from implementation
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Bridge ...
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Bridge
Provide rich functionality
Problem: support commands with undo
Solution: abstract from specific commands
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Command ...
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Command
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Hush Online Technology
hush@cs.vu.nl
02/15/00
