Book Image

Hands-On Design Patterns with Delphi

By : Primož Gabrijelčič
Book Image

Hands-On Design Patterns with Delphi

By: Primož Gabrijelčič

Overview of this book

Design patterns have proven to be the go-to solution for many common programming scenarios. This book focuses on design patterns applied to the Delphi language. The book will provide you with insights into the language and its capabilities of a runtime library. You'll start by exploring a variety of design patterns and understanding them through real-world examples. This will entail a short explanation of the concept of design patterns and the original set of the 'Gang of Four' patterns, which will help you in structuring your designs efficiently. Next, you'll cover the most important 'anti-patterns' (essentially bad software development practices) to aid you in steering clear of problems during programming. You'll then learn about the eight most important patterns for each creational, structural, and behavioral type. After this, you'll be introduced to the concept of 'concurrency' patterns, which are design patterns specifically related to multithreading and parallel computation. These will enable you to develop and improve an interface between items and harmonize shared memories within threads. Toward the concluding chapters, you'll explore design patterns specific to program design and other categories of patterns that do not fall under the 'design' umbrella. By the end of this book, you'll be able to address common design problems encountered while developing applications and feel confident while building scalable projects.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
About Packt


This chapter looked into some important Delphi programming concepts that cannot be directly classified as design patterns because they are language-specific, while they are too rich to be called idioms.

Event-driven programming is a basic tool for rapid application development in Delphi. It has its roots in the first GUI libraries and is also important for writing objects that are created and used in code, not just for components and controls.

Delphi actions are implementations of the command pattern, which was covered in Chapter 6,  Nullable Object, Template Method, Command, State. Actions can be used to separate the user interface from the code and to reduce the complexity of a complicated Delphi program.



Next, we looked into LiveBindings, which is a Delphi mechanism that can be used to write programs without writing code. LiveBindings is an implementation of an observer pattern, which was discussed in Chapter 7,  Iterator, Visitor, Observer, and Memento. It is especially useful...