States and Animations with Qt and QML | Qt5 C++ GUI Programming Cookbook

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Qt5 C++ GUI Programming Cookbook

By : Eng

3 (4)

Qt5 C++ GUI Programming Cookbook

3 (4)

By: Eng

Overview of this book

With the advancement of computer technology, the software market is exploding with tons of software choices for the user, making their expectations higher in terms of functionality and the look and feel of the application. Therefore, improving the visual quality of your application is vital in order to overcome the market competition and stand out from the crowd. This book will teach you how to develop functional and appealing software using Qt5 through multiple projects that are interesting and fun. This book covers a variety of topics such as look-and-feel customization, GUI animation, graphics rendering, implementing Google Maps, and more. You will learn tons of useful information, and enjoy the process of working on the creative projects provided in this book

Preface

Preface

Who this book is for

What this book covers

To get the most out of this book

Sections

Get in touch

Free Chapter

Look-and-Feel Customization with Qt Designer

Look-and-Feel Customization with Qt Designer

Introduction

Technical requirements

Using style sheets with Qt Designer

Customizing basic style sheets

Creating a login screen using style sheets

Using resources in style sheets

Customizing properties and sub-controls

Styling in Qt Modeling Language (QML)

Exposing the QML object pointer to C++

Event Handling - Signals and Slots

Event Handling - Signals and Slots

Introduction

Technical requirements

New signals and slots syntax

UI events with signals and slots

Asynchronous programming made easier

Function callbacks

States and Animations with Qt and QML

States and Animations with Qt and QML

Introduction

Technical requirements

Property animation in Qt

Using easing curves to control property animation

Creating an animation group

Creating a nested animation group

State machines in Qt

States, transitions, and animations in QML

Animating widget properties using animators

Sprite animation

QPainter and 2D Graphics

QPainter and 2D Graphics

Introduction

Technical requirements

Drawing basic shapes onscreen

Exporting shapes to SVG files

Coordinate transformation

Displaying images onscreen

Applying image effects to graphics

Creating a basic paint program

Rendering a 2D canvas in QML

OpenGL Implementation

OpenGL Implementation

Introduction

Technical requirements

Setting up OpenGL in Qt

Hello World!

Rendering 2D shapes

Rendering 3D shapes

Texturing in OpenGL

Basic lighting in OpenGL

Moving an object using keyboard controls

3D canvas in QML

Using Network and Managing Large Documents

Using Network and Managing Large Documents

Introduction

Technical requirements

Creating a TCP server

Creating a TCP client

Uploading and downloading files using FTP

Threading Basics - Asynchronous Programming

Threading Basics - Asynchronous Programming

Introduction

Technical requirements

Using threads

QObject and QThread

Data protection and sharing data between threads

Working with QRunnable processes

Building a Touch Screen Application with Qt5

Building a Touch Screen Application with Qt5

Introduction

Technical requirements

Setting up Qt for mobile applications

Designing a basic user interface with QML

Touch events

Animation in QML

Displaying information using model/view

Integrating QML and C++

XML Parsing Made Easy

XML Parsing Made Easy

Technical requirements

Processing XML data using the stream reader

Writing XML data using the Stream Writer

Processing XML data using the QDomDocument class

Writing XML data using the QDomDocument class

Using Google's Geocoding API

Conversion Library

Conversion Library

Introduction

Technical requirements

Converting data

Converting images

Converting videos

Converting currency

Accessing Databases with SQL Driver and Qt

Accessing Databases with SQL Driver and Qt

Introduction

Technical requirements

Setting up a database

Connecting to a database

Writing basic SQL queries

Creating a login screen with Qt

Displaying information from a database on a model view

Advanced SQL queries

Develop Web Applications using Qt WebEngine

Develop Web Applications using Qt WebEngine

Introduction

Technical requirements

Introducing Qt WebEngine

Using WebView and web settings

Embedding Google Maps in your project

Calling C++ functions from JavaScript

Calling JavaScript functions from C++

Performance Optimization

Performance Optimization

Introduction

Technical requirements

Optimizing form and C++

Profiling and optimizing QML

Rendering and animation

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Drawing basic shapes on screen

In this section, we will learn how to draw simple vector shapes (line, rectangle, circle, and so on) and display text on the main window using the QPainter class. We will also learn how to change the drawing style of the vector shapes using the QPen class.

How to do it…

First, let's create a new Qt Widgets Application project:

Open up mainwindow.ui and remove the menu bar, main tool bar, and status bar so that we get a clean, empty main window. Right-click on the bar widgets and select Remove Menu Bar from the pop-up menu:
Then, open up mainwindow.h and add the following code to include the QPainter header file:
```
#include <QMainWindow>
#include <QPainter>
```

Then, declare the paintEvent() event handler below the class destructor:

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
virtual void paintEvent(QPaintEvent *event);

Next, open up mainwindow.cpp and define the paintEvent() event handler:
```
void MainWindow::paintEvent(QPaintEvent *event...
```

Visually different images

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