using Gtk; public class Dino.Ui.ViewModel.TweaksPreferencesPage : Object { public int avatar_roundness { get; set; } } [GtkTemplate (ui = "/im/dino/Dino/preferences_window/tweaks_preferences_page.ui")] public class Dino.Ui.TweaksPreferencesPage : Adw.PreferencesPage { [GtkChild] private unowned Adw.SpinRow avatar_roundness_row; public ViewModel.TweaksPreferencesPage model { get; set; default = new ViewModel.TweaksPreferencesPage(); } private Binding? avatar_roundness_binding; construct { this.notify["model"].connect(on_model_changed); } private void on_model_changed() { if (avatar_roundness_binding != null) { avatar_roundness_binding.unbind(); avatar_roundness_binding = null; } if (model != null) { avatar_roundness_binding = model.bind_property("avatar-roundness", avatar_roundness_row, "value", BindingFlags.SYNC_CREATE | BindingFlags.BIDIRECTIONAL); } } }