Clutter-18 ▶ Clutter ▶ FlowLayout ▶ SignalSignatures

The signal is emitted each time a layout manager has been changed. Every Clutter.Actor using the manager instance as a layout manager should connect a handler to the Clutter.LayoutManager::layout-changed signal and queue a relayout on themselves:

  static void layout_changed (ClutterLayoutManager *manager,
                              ClutterActor         *self)
  {
    clutter_actor_queue_relayout (self);
  }
  ...
    self->manager = g_object_ref_sink (manager);
    g_signal_connect (self->manager, "layout-changed",
                      G_CALLBACK (layout_changed),
                      self);
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Sub-classes of Clutter.LayoutManager that implement a layout that can be controlled or changed using parameters should emit the ::layout-changed signal whenever one of the parameters changes, by using Clutter.LayoutManager.layout_changed.

The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.

Note that getting this signal doesn’t itself guarantee that the value of the property has actually changed. When it is emitted is determined by the derived GObject class. If the implementor did not create the property with GObject.ParamFlags.EXPLICIT_NOTIFY, then any call to g_object_set_property() results in ::notify being emitted, even if the new value is the same as the old. If they did pass GObject.ParamFlags.EXPLICIT_NOTIFY, then this signal is emitted only when they explicitly call g_object_notify() or g_object_notify_by_pspec(), and common practice is to do that only when the value has actually changed.

This signal is typically used to obtain change notification for a single property, by specifying the property name as a detail in the g_signal_connect() call, like this:

g_signal_connect (text_view->buffer, "notify::paste-target-list",
                  G_CALLBACK (gtk_text_view_target_list_notify),
                  text_view)
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It is important to note that you must use [canonical parameter names][class@GObject.ParamSpec#parameter-names] as detail strings for the notify signal.