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  • Application Development with Qt Creator - Second Edition
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Application Development with Qt Creator - Second Edition

Application Development with Qt Creator - Second Edition

4 (25)
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Application Development with Qt Creator - Second Edition

Application Development with Qt Creator - Second Edition

4 (25)

Overview of this book

This book is great for developers who are new to Qt and Qt Creator and who are interested in harnessing the power of Qt for cross-platform development. If you have basic experience programming in C++, you have what it takes to create engaging cross-platform applications using Qt and Qt Creator!
Table of Contents (15 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Getting Started with Qt Creator
1. Getting Started with Qt Creator
Downloading Qt and Qt Creator
Finding your way around Qt Creator
Your first application – Hello World
Hello World using the QtGui library
Hello World using Qt Quick
Summary
2
2. Building Applications with Qt Creator
2. Building Applications with Qt Creator
Getting started – our sample library
Learning the landscape – the Build menu and the .pro files
Linking against our sample library
Getting lost and found again – debugging
The Projects pane and building your project
A review – running and debugging your application
Summary
3
3. Designing Your Application with Qt Designer
3. Designing Your Application with Qt Designer
Code interlude – signals and slots
Creating forms in Qt Designer
Instantiating forms, message boxes, and dialogs in your application
Wiring the Qt Widgets' application logic
Code interlude – Qt Quick and the QML syntax
Creating Qt Quick applications in Qt Designer
Summary
4
4. Qt Foundations
4. Qt Foundations
Representing data using Qt's core classes
Multithreading in Qt
Accessing files using Qt
Accessing HTTP resources using Qt
Parsing XML using Qt
Summary
5
5. Developing Applications with Qt Widgets
5. Developing Applications with Qt Widgets
Your main application and its menus
Simple Qt Widgets
Managing the widget layout with layouts
Model-view-controller programming with Qt
Rendering web content with QWebView
Summary
6
6. Drawing with Qt
6. Drawing with Qt
What we need to start drawing with Qt
Drawing with QPainter on QPaintDevice instances
Drawing off screen
Creating custom widgets
The Graphics View Framework
Summary
7
7. Doing More with Qt Quick
7. Doing More with Qt Quick
The fundamental concepts of Qt Quick
States and transitions in Qt Quick
Integrating Qt Quick and C++
Putting it all together – an image gallery application
Summary
8
8. Multimedia and Qt Quick
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8. Multimedia and Qt Quick
Multimedia in Qt
Playing audio clips and sound effects
Playing video clips
Accessing the camera
Summary
9
9. Sensors and Qt Quick
9. Sensors and Qt Quick
Sensors in Qt
Determining the device location
Obtaining a device's position – a simple example
Summary
10
10. Localizing Your Application with Qt Linguist
10. Localizing Your Application with Qt Linguist
Understanding the task of localization
Marking strings for localization
Localizing your application with QLinguist
Including localized strings in your application
Localizing special parameters – currencies and dates with QLocale
Summary
11
11. Optimizing Performance with Qt Creator
11. Optimizing Performance with Qt Creator
The QML performance analyzer
Finding memory leaks with Valgrind
Summary
12
12. Developing Mobile Applications with Qt Creator
12. Developing Mobile Applications with Qt Creator
A mobile software development primer
Setting up Qt Creator for Android
Supporting other mobile platforms
Summary
13
13. Qt Tips and Tricks
13. Qt Tips and Tricks
Writing console applications with Qt Creator
Integrating Qt Creator with version control systems
Configuring the coding style and coding format options
Building projects from the command line
Setting the Qt Quick window display options
Learning more about Qt
Debugging Qt's signal-slot connections
Summary
14
Index
Index

Accessing the camera

To access the camera when it is supported by the hardware and Qt Multimedia, use the Camera type and its associated types to control the camera's capture behavior, exposure, flash, focus, and image processing settings. A simple use of the camera to show a viewfinder looks like the following code:

import QtQuick 2.3
import QtMultimedia 5.0

Item {
    width: 640
    height: 480

    Camera {
        id: camera
    }

    VideoOutput {
        source: camera
        anchors.fill: parent
    }
}

In short, the Camera type acts like a source for the video just as a MediaPlayer instance does.

The Camera type provides a few properties to control its behavior. They are:

  • imageCapture: This is an instance of CameraCapture, which defines how the camera should capture an image

  • videoRecording: This is an instance of CameraRecorder, which defines how the camera should capture a video

  • exposure: This is an instance of CameraExposure, which controls the various options for the exposure...

End of Section 4
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