Event Filters

Introduction to Qt Widgets (Part 69)

16 October 2025

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To watch this video on our website please or view it directly on YouTube

This final episode of "Introduction to Qt Widgets" will end on a high note - a very high note even - namely by Jesper talking about event filters.

Event filters are a super neat tool in Qt, with which you can do truly amazing things - but also shoot yourself in the foot, so your whole leg falls off.

Chapters:

00:00 Welcome

00:31 The worst boss ever

01:58 What are your options?

03:23 There is another option!

06:26 Event filters solving our boss problem

10:02 Men in black

11:14 A truly evil event filter!

15:35 Advertise - Let us help you profile your application

15:53 Update the code to have only one event filter

19:19 The end - but not goodbye

Links:

The example code showcased in this video is available here.

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Jesper K. Pedersen

HR Director / COO

Jesper K. Pedersen – COO/HR director at KDAB. Jesper has actively developed with Qt since 1998 and, despite his fancy title, still does so.

He has held almost 100 training classes in Qt since 2000. Today, his greatest claim to fame is the QML youtube series and more recently his youtube series called Qt Widgets and More.

Event Filters

Introduction to Qt Widgets (Part 69)

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