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PySide GUI Application Development - Second Edition by Venkateshwaran Loganathan, Gopinath Jaganmohan

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Chapter 4. Events and Signals

In the chapters that we saw so far, we tried out various implementations of readily available functions to build a base GUI by extending the Qt objects without handling custom events. In this chapter, we will look into some of the internal implementations of working concepts of these functions in the context of events and signals. Qt being an event-driven UI toolkit, events and event delivery play an important role in the Qt architecture. We will start this chapter by discussing events and signals, their implementation, and will go on to discuss handling drag and drop events, and drawing functionalities.

Event management

An event, in general, is some change in state in discrete time that is induced by external or internal ...

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