Book Image

Pyside GUI Application Development- Second Edition - Second Edition

By : Venkateshwaran Loganathan, Gopinath Jaganmohan
Book Image

Pyside GUI Application Development- Second Edition - Second Edition

By: Venkateshwaran Loganathan, Gopinath Jaganmohan

Overview of this book

Elegantly-built GUI applications are always a massive hit among users. PySide is an open source software project that provides Python bindings for the Qt cross-platform UI framework. Combining the power of Qt and Python, PySide provides easy access to the Qt framework for Python developers and also acts as an excellent rapid application development platform. This book will take you through everything you need to know to develop UI applications. You will learn about installing and building PySide in various major operating systems as well as the basics of GUI programming. The book will then move on to discuss event management, signals and slots, and the widgets and dialogs available with PySide. Database interaction and manipulation is also covered. By the end of this book, you will be able to program GUI applications efficiently and master how to develop your own applications and how to run them across platforms.
Table of Contents (13 chapters)

Tracking time using timers


Most of the GUI applications are time bound, and it is extremely important to use timers to capture information about the program runtime and other similar tasks. You may also use timers to generate some event at specified time intervals, calculate the elapsed time for some action, implement a countdown timer, and so on. This section of the chapter covers how to create and use timers in our application, and we will develop a digital clock application explaining the concept of timers.

The classes that are used to create this application in Qt are PySide.QtCore.QTimer and PySide.QtCore.QDateTime. The QTimer class provides a high-level programming interface for timers. It provides repetitive and single-shot timers. Repetitive timers run continuously and restart at the expiry of one time slot. Single-shot timers will run exactly once and expire after one time slot. A timeout event will occur at the expiry of the given time slot. The timer can be started by issuing a...