Ladybird: GTK 4 version

Well hello friends! :^)

This is a WIP attempt to develop an elegant, beautiful UI for the SerenityOS Browser engine, based on GTK 4 and Adwaita.

This is a project by us, for us, based on the things we like. If you like some of the same things, you are welcome to join the project!

License

This project is licensed under a 2-clause BSD license.

Building

This project depends on the yet-unreleased libadwaita version. You're either going to have to build libadwaita from source, or you can use flatpak-builder to create a Flatpak dev environment.

Setup: Install Flatpak and dependencies

If you don't already have Flatpak installed on your system, install it from your package manager. On a Debian-based system like Ubuntu, the Flatpak installation steps will look like below:

sudo apt install flatpak flatpak-builder

You will likely need to re-log into your user session after installing Flatpak to ensure your environment variables are updated properly. To verify that XDG_DATA_DIRS is set up properly, run env | grep XDG. Something similar to the output below should be present:

XDG_DATA_DIRS=$HOME/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:<os-defaults>

Setup: Install GNOME development Flatpak packages

Once Flatpak is installed on your system, install the GNOME Platform and SDK packages from the gnome-nightly repository. You need to use the master branch, since this project requires unreleased libadwaita features.

# Make sure that the gnome-nightly repositories are in your user Flatpak installation
flatpak remote-add --user --if-not-exists gnome-nightly https://nightly.gnome.org/gnome-nightly.flatpakrepo

# Install the GNOME SDK
flatpak install --user org.gnome.Platform//master org.gnome.Sdk//master

Build: Build the application package

# Build and install the application to your local Flatpak installation
flatpak-builder --user --install --force-clean --ccache build org.serenityos.Ladybird-gtk4.json 

# Run the app
flatpak run --user org.serenityos.Ladybird-gtk4

If you are only modifying the ladybird-gtk4 files, then adding the --keep-build-dirs flag will help reduce churn for the serenity components. The --ccache flag is essentially mandatory to reduce incremental build times.