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  • Book Overview & Buying Mastering Qt 5
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Mastering Qt 5

Mastering Qt 5

By : Guillaume Lazar, Robin Penea
3.2 (10)
Buy this Book
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Mastering Qt 5

Mastering Qt 5

3.2 (10)
By: Guillaume Lazar, Robin Penea
Buy this Book

Overview of this book

Qt 5.7 is an application development framework that provides a great user experience and develops full-capability applications with Qt Widgets, QML, and even Qt 3D. This book will address challenges in successfully developing cross-platform applications with the Qt framework. Cross-platform development needs a well-organized project. Using this book, you will have a better understanding of the Qt framework and the tools to resolve serious issues such as linking, debugging, and multithreading. Your journey will start with the new Qt 5 features. Then you will explore different platforms and learn to tame them. Every chapter along the way is a logical step that you must take to master Qt. The journey will end in an application that has been tested and is ready to be shipped.
Table of Contents (15 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Get Your Qt Feet Wet
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1. Get Your Qt Feet Wet
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Creating a project
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MainWindow structure
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Qt Designer
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Signals and slots
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Custom QWidget
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Adding a task
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Using a QDialog
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Distributing code responsibility
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Emitting a custom signal using lambdas
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Simplifying with the auto type and a range-based for loop
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Summary
2
2. Discovering QMake Secrets
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2. Discovering QMake Secrets
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Designing a cross-platform project
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Transforming SysInfo into a singleton
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Exploring Qt Charts
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CpuWidget using QCharts
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Memory using Qcharts
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The .pro file in depth
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Under the hood of qmake
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Beneath Q_OBJECT and signals/slots
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Summary
3
3. Dividing Your Project and Ruling Your Code
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3. Dividing Your Project and Ruling Your Code
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Designing a maintainable project
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Defining data classes
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Storing your data in a database
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Protecting your code with a smart pointer
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Implementing the model
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Summary
4
4. Conquering the Desktop UI
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4. Conquering the Desktop UI
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Creating a GUI linked to a core shared library
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Listing your albums with AlbumListWidget
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Creating a ThumbnailProxyModel
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Displaying the selected album with AlbumWidget
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Enhancing thumbnails with PictureDelegate
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Displaying a picture with PictureWidget
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Composing your Gallery app
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Summary
5
5. Dominating the Mobile UI
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5. Dominating the Mobile UI
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Starting with Qt Quick and QML
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Checking your development environment
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Creating a Qt Quick project
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Preparing your Qt Quick gallery entry point
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Displaying albums with ListView
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Theming the application with a QML singleton
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Loading a database on mobile
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Creating a new album from a custom InputDialog
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Loading images with an ImageProvider
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Displaying thumbnails in a GridView
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Swiping through full resolution pictures
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Summary
6
6. Even Qt Deserves a Slice of Raspberry Pi
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6. Even Qt Deserves a Slice of Raspberry Pi
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Discovering Qt3D
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Configuring Qt for your Raspberry Pi
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Creating an entry point for your Qt3D code
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Setting up the scene
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Assembling your Qt3D entities
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Preparing the board game
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Crafting entities from the factory
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Building a snake engine in JavaScript
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Varying the HUD with QML states
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Profiling your QML application
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Summary
7
7. Third-Party Libraries Without a Headache
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7. Third-Party Libraries Without a Headache
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Creating your Qt Designer plugin
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Configuring the project for Windows
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Configuring the project for Linux
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Configuring the project for Mac
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Implementing your OpenCV filters
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Designing the UI with FilterWidget
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Exposing your plugin to Qt Designer
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Using your Qt Designer plugin
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Building the image-filter application
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Summary
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8. Animations - Its Alive, Alive!
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8. Animations - Its Alive, Alive!
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Preparing an SDK
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Creating your plugins
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Loading your plugins dynamically
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Using the plugins inside the application
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Discovering the Animation Framework
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Making your thumbnails jump
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Fading the picture in
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Flashing the thumbnail in a sequence
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Summary
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9. Keeping Your Sanity with Multithreading
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9. Keeping Your Sanity with Multithreading
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Discovering QThread
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Flying over Qt multithreading technologies
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Architecting the Mandelbrot project
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Defining a Job class with QRunnable
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Using QThreadPool in MandelbrotCalculator
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Displaying the fractal with MandelbrotWidget
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Summary
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10. Need IPC? Get Your Minions to Work
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10. Need IPC? Get Your Minions to Work
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Architecturing an IPC project
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Laying down the foundations with an SDK
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Working with QDataStream and QTcpSocket
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Interacting with sockets in the worker
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Interacting with sockets from the application
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Building your own QTcpServer
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Summary
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11. Having Fun with Serialization
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11. Having Fun with Serialization
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Architecting the drum machine project
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Creating a drum track
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Making your objects serializable with QVariant
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Serializing objects in JSON format
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Serializing objects in XML format
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Serializing objects in binary format
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Playing low latency sounds with QSoundEffect
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Triggering a QButton with your keyboard
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Bringing PlaybackWorker to life
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Accepting mouse drag and drop events
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Summary
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12. You Shall (Not) Pass with QTest
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12. You Shall (Not) Pass with QTest
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Discovering Qt Test
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Executing your tests
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Writing factorized tests with datasets
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Benchmarking your code
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Testing your GUI
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Spying on your application with QSignalSpy
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Summary
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13. All Packed and Ready to Deploy
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13. All Packed and Ready to Deploy
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Packaging your application
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Packaging for Windows
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Packaging for Linux with a distribution package
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Packaging for Linux with AppImage
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Packaging for Mac OS X
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Packaging for Android
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Packaging for iOS
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Summary
14
14. Qt Hat Tips and Tricks
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14. Qt Hat Tips and Tricks
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Managing your workspace with sessions
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Searching with the Locator
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Increasing the compilation speed
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Examining the memory with Qt Creator
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Generating random numbers
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Silencing unused variable warnings
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Logging custom objects to QDebug
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Improving log messages
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Saving your logs to a file
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Generating a command-line interface
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Sending and receiving HTTP data
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Summary

Storing your data in a database

Now that the data classes are ready, we can proceed to implement the database layer. Qt provides a ready-to-use sql module. Various databases are supported in Qt using SQL database drivers. In gallery-desktop, we will use the SQLITE3 driver, which is included in the sql module and perfectly fits the use case:

  • A very simple database schema: No need for complex queries
  • Very few or no concurrent transactions: No need for a complex transaction model
  • A single-purpose database: No need to spawn a system service, the database is stored in a single file and does not need to be accessed by multiple applications

The database will be accessed from multiple locations; we need to have a single entry point for it. Create a new C++ class named DatabaseManager and modify DatabaseManager.h to look like this:

#include <QString> 
 
class QSqlDatabase; 
 
const QString DATABASE_FILENAME = "gallery.db"; 
 
class DatabaseManager 
{ 
public: 
   ...
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