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Custom widgets in GTK 4 – Layout

Submitted by Rianne Schestowitz on Monday 27th of April 2020 05:47:45 PM Filed under
GNOME

As we said earlier, “everything is a widget.” For example, we recommend that you use a GtkLabel instead of manually rendering a pango layout, or a GtkImage instead of manually loading and rendering a pixbuf. Using a ready-made widget ensures that you get all of the expected behaviors, such as selection handling, context menus or hi-dpi support. And it is much easier than doing it all yourself.

The default implementations of the snapshot() and measure() functions are handling child widgets automatically. The main responsibility for a custom widget is to arrange the child widgets as required. In GTK 3, this would have been done by implementing the size_allocate() function. You can still do that. But in GTK 4, a more convenient alternative is to use a layout manager. GTK comes with a number of predefined layout managers, such as GtkBoxLayout, GtkCenterLayout, GtkGridLayout, to name just a few.

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