Book Image

Mastering Qt 5 - Second Edition

By : Guillaume Lazar, Robin Penea
Book Image

Mastering Qt 5 - Second Edition

By: Guillaume Lazar, Robin Penea

Overview of this book

Qt 5.11 is an app development framework that provides a great user experience and develops full capability applications with Qt Widgets, QML, and even Qt 3D. Whether you're building GUI prototypes or fully-fledged cross-platform GUI applications with a native look and feel, Mastering Qt 5 is your fastest, easiest, and most powerful solution. This book addresses various challenges and teaches you to successfully develop cross-platform applications using the Qt framework, with the help of well-organized projects. Working through this book, you will gain a better understanding of the Qt framework, as well as the tools required to resolve serious issues, such as linking, debugging, and multithreading. You'll start off your journey by discovering the new Qt 5.11 features, soon followed by exploring different platforms and learning to tame them. In addition to this, you'll interact with a gamepad using Qt Gamepad. Each chapter is a logical step for you to complete in order to master Qt. By the end of this book, you'll have created an application that has been tested and is ready to be shipped.
Table of Contents (16 chapters)

Crafting entities from the factory

Now that we have a board to receive items, we will create the game items' factory. The factory is a design pattern that allows us to create an object without exposing the creation logic to the caller. This factory can be seen as a helper class that will handle all the dirty tasks required when you want to create a new game item from JavaScript. Do you remember GameEntity.qml? It is the parent component of Apple.qml, Snake.qml, and Wall.qml. The factory will be able to create a specific entity for a given a type and coordinates. We will use the property type to identify an entity kind. Here is the factory pattern schema used in our snake game:

We can now create the factory.js file, which begins like this:

var SNAKE_TYPE = 1; 
var WALL_TYPE  = 2; 
var APPLE_TYPE = 3; 
var snakeComponent = Qt.createComponent("SnakePart.qml"); ...