Gtk.Widget::style-set

function callback(widget, previous_style:Gtk.Style, ):void;

The ::style-set signal is emitted when a new style has been set on a widget. Note that style-modifying functions like Gtk.Widget.prototype.modify_base also cause this signal to be emitted.

Note that this signal is emitted for changes to the deprecated Gtk.Style. To track changes to the Gtk.StyleContext associated with a widget, use the Gtk.style-updated signal.