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Tag: GTK+ 3

GTK3 Can Be a Pain in the Themes

Starting with Xojo 2017r2, Linux apps use GTK3. Since Xojo uses native controls that means your app’s controls will use the theme of the Linux distribution the app runs on. This can sometimes mean that your app’s UI will not look exactly like what you designed in the Layout Editor because a theme may dramatically change control sizes and padding.┬áThis is a problem that can occur with any modern GTK3 app.

If this is a problem for your apps, there are a couple ways you can work around it.

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Goodbye GTK+ 2, Hello GTK+ 3

With the release of Xojo 2017 Release 2 we have updated our Linux Desktop framework to use GTK+ 3 instead of GTK+ 2. For those not familiar with Linux, GTK+ is a User Interface (i.e. UI) toolkit, much like Cocoa is for macOS and Win32 controls (or WinForms.NET or WPF) is for Windows. GTK+ 2 has been supplying the user interface for Xojo Desktop apps for Linux since we first targeted Linux over a decade ago. It has since been deprecated in favor of GTK+ 3 for quite some time now and GTK+ 2 is typically not installed by default on most Linux distros these days, which makes deploying Xojo Desktop apps on Linux more painful. Unfortunately GTK+ 3 is not ABI compatible with GTK+ 2 so we could not migrate to using GTK+ 3 without completely ditching GTK+ 2.

Let’s take a closer look at what this means for your Linux apps:

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