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Making a GTK application in Haskell, part 1

4 hours ago
  • This tutorial series aims to build a todo-list application using Haskell, GTK 4, and the Adwaita library.
  • Adwaita provides GTK components that implement GNOME's design language (HIG), including responsive design and theme switching.
  • Haskell bindings for GTK are generated via the haskell-gi toolkit, allowing a Haskell interface that relates to the C API.
  • The application follows the Elm Architecture (Model-View-Update) with Model, View, Update, Messages, and Effects.
  • The Model defines data structures: TodoId, Todo (with id, title, done), and Model (todos map and nextId).
  • Messages represent user interactions (e.g., Add Text, SetDoneStatus TodoId Bool).
  • The update function processes messages, updates the model, and returns effects (e.g., saving to disk).
  • The View function builds GTK widgets (Box, ListBox, EntryRow, ActionRow, Clamp, ScrolledWindow, ToolbarView) and connects signals to dispatch messages.
  • The Runtime module connects Model, View, and Update: it defines dispatch (sends messages via GTK idle loop) and step (updates model and view).
  • The main module creates an Adw.Application, connects the activate signal, and runs the application loop.