Widgets

Widgets are premade components with properties, styles & signals. They can be usually put in one of the following categories:

• Toplevel - Windows, dialogs and their variants

• Containers/Layout - Boxes, frames, viewports, popups etc.

• Control - Switches, buttons, text inputs etc.

• Display - Images, icons, labels, textviews, spinners etc.

Widgets follow OOP, meaning that they inherit properties, signals and others.

Valadoc has beautiful interactive diagrams that explain the hierarchy of each widget, for example Gtk.Switch.

On Crystal, while we don't generate fancy diagrams, each widget includes all the methods (which includes properties & signals) all the way back to GObject::Object, for example Gtk::Switch.