8. Multimedia and Qt Quick | Application Development with Qt Creator - Second Edition

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Application Development with Qt Creator - Second Edition

4 (25)

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!

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. 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. 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. 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. 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. 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. 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. 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. Multimedia and Qt Quick

8. Multimedia and Qt Quick

Multimedia in Qt

Playing audio clips and sound effects

Playing video clips

Accessing the camera

Summary

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. 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. Optimizing Performance with Qt Creator

11. Optimizing Performance with Qt Creator

The QML performance analyzer

Finding memory leaks with Valgrind

Summary

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. 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

Index

Index

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Playing video clips

Playing video is as easy as playing audio; there's a Video type that supports playing the video and displaying the video on the display. Here's a video player that plays video when you click on it and pauses and restarts the playback when you press the Space bar:

import QtQuick 2.3
import QtMultimedia 5.0

Video {
    id: video
    width : 800
    height : 600
    source: "video.avi"

    MouseArea {
        anchors.fill: parent
        onClicked: {
            video.play()
        }
    }

    focus: true
    Keys.onSpacePressed: 
        video.playbackState == MediaPlayer.PlayingState ? 
            video.pause() : 
            video.play()
}

The Keys type emits signals for the various keys that are pressed; here, we're tying the spacePressed signal to a script that pauses and plays a video.

Most of the properties of Video are the same as of Audio, except that there's no metaData property. It's a subclass of Item, so the usual positioning properties such as anchors, x...

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