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GTK 4 is the latest version of a popular cross-platform widget toolkit written in C. Thanks to GObject-Introspection, GTK’s API can be easily targeted by various programming languages.

The gtk-kn project provides bindings to many GTK-related libraries, which we will be using throughout this user guide.

Who this guide is for

This guide assumes that you are familiar with Kotlin Native. If this is not the case, reading Kotlin’s documentation is a great way to get started. If you have experience with another high-level language such as Python or Swift, you might find that reading Kotlin’s introductory documentation provides sufficient information as well.

Fortunately, this - together with the desire to develop graphical applications - is all that is necessary to benefit from this guide.

How to use this guide

In general, this guide assumes that you are reading it in sequence from front to back. However, if you are using it as a reference for a certain topic, you might find it useful to just jump into it.

The guide strives to explain essential GTK concepts paired with practical examples. However, if a concept can be better conveyed with a less practical example, we took this path most of the time. If you are interested in contained and useful examples, we refer you to the corresponding section of gtk-kn‘s repository.