Book Image

Learn Qt 5

By : Nicholas Sherriff
Book Image

Learn Qt 5

By: Nicholas Sherriff

Overview of this book

Qt is a mature and powerful framework for delivering sophisticated applications across a multitude of platforms. It has a rich history in the Linux world, is widely used in embedded devices, and has made great strides in the Mobile arena over the past few years. However, in the Microsoft Windows and Apple Mac OS X worlds, the dominance of C#/.NET and Objective-C/Cocoa means that Qt is often overlooked. This book demonstrates the power and flexibility of the Qt framework for desktop application development and shows how you can write your application once and deploy it to multiple operating systems. Build a complete real-world line of business (LOB) solution from scratch, with distinct C++ library, QML user interface, and QtTest-driven unit-test projects. This is a suite of essential techniques that cover the core requirements for most LOB applications and will empower you to progress from a blank page to shipped application.
Table of Contents (11 chapters)

Entity collections

To implement entity collections, we need to leverage some more advanced C++ techniques, and we will take a brief break from our conventions so far, implementing multiple classes in a single header file.

Create entity-collection.h in cm-lib/source/data, and in it, add our namespaces as normal and forward declare Entity:


namespace cm { namespace data { class Entity;


Next, we’ll walk through the necessary classes in turn, each of which must be added in order inside the namespaces.

We first define the root class, which does nothing more than inheriting from QObject and giving us access to all the goodness that it brings, such as object ownership and signals. This is required because classes deriving directly from QObject cannot be templated:

class CMLIBSHARED_EXPORT EntityCollectionObject :...