Book Image

Qt5 Python GUI Programming Cookbook

By : B. M. Harwani
Book Image

Qt5 Python GUI Programming Cookbook

By: B. M. Harwani

Overview of this book

PyQt is one of the best cross-platform interface toolkits currently available; it's stable, mature, and completely native. If you want control over all aspects of UI elements, PyQt is what you need. This book will guide you through every concept necessary to create fully functional GUI applications using PyQt, with only a few lines of code. As you expand your GUI using more widgets, you will cover networks, databases, and graphical libraries that greatly enhance its functionality. Next, the book guides you in using Qt Designer to design user interfaces and implementing and testing dialogs, events, the clipboard, and drag and drop functionality to customize your GUI. You will learn a variety of topics, such as look and feel customization, GUI animation, graphics rendering, implementing Google Maps, and more. Lastly, the book takes you through how Qt5 can help you to create cross-platform apps that are compatible with Android and iOS. You will be able to develop functional and appealing software using PyQt through interesting and fun recipes that will expand your knowledge of GUIs
Table of Contents (20 chapters)
Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Updating two progress bars using two threads


For multitasking, you need more than one thread running simultaneously. The focus of this recipe is on understanding how two tasks can be performed asynchronously via two threads, that is, how CPU time is allocated to these two threads and how switching is done between them.

This recipe will help you understand how two threads run independently without interfering with each other. We will be making use of two progress bars in this recipe. One progress bar will represent progress in downloading a file, and the other progress bar will represent progress in scanning for viruses on the current drive. Both progress bars will progress independently of each other through two different threads.

How to do it...

Let's learn how two progress bars are managed by two threads. To understand how CPU time is allocated to each running thread to execute two tasks simultaneously, perform the following steps:

  1. Let's create an application based on the Dialog without Buttons...