Class
Gtk.SignalListItemFactory
Description [src]
final class Gtk.SignalListItemFactory : Gtk.ListItemFactory {
/* No available fields */
}
GtkSignalListItemFactory
is a GtkListItemFactory
that emits signals
to to manage listitems.
Signals are emitted for every listitem in the same order:
-
GtkSignalListItemFactory::setup
is emitted to set up permanent things on the listitem. This usually means constructing the widgets used in the row and adding them to the listitem. -
GtkSignalListItemFactory::bind
is emitted to bind the item passed viaGtkListItem:item
to the widgets that have been created in step 1 or to add item-specific widgets. Signals are connected to listen to changes - both to changes in the item to update the widgets or to changes in the widgets to update the item. After this signal has been called, the listitem may be shown in a list widget. -
GtkSignalListItemFactory::unbind
is emitted to undo everything done in step 2. Usually this means disconnecting signal handlers. Once this signal has been called, the listitem will no longer be used in a list widget. -
GtkSignalListItemFactory::bind
andGtkSignalListItemFactory::unbind
may be emitted multiple times again to bind the listitem for use with new items. By reusing listitems, potentially costly setup can be avoided. However, it means code needs to make sure to properly clean up the listitem in step 3 so that no information from the previous use leaks into the next use. -
GtkSignalListItemFactory::teardown
is emitted to allow undoing the effects ofGtkSignalListItemFactory::setup
. After this signal was emitted on a listitem, the listitem will be destroyed and not be used again.
Note that during the signal emissions, changing properties on the
GtkListItems
passed will not trigger notify signals as the listitem’s
notifications are frozen. See g_object_freeze_notify()
for details.
For tracking changes in other properties in the GtkListItem
, the
::notify signal is recommended. The signal can be connected in the
GtkSignalListItemFactory::setup
signal and removed again during
GtkSignalListItemFactory::teardown
.
Constructors
gtk_signal_list_item_factory_new
Creates a new GtkSignalListItemFactory
.
Signals
Gtk.SignalListItemFactory::bind
Emitted when a new GtkListItem:item
has been set
on the listitem
and should be bound for use.
Gtk.SignalListItemFactory::setup
Emitted when a new listitem has been created and needs to be setup for use.
Gtk.SignalListItemFactory::teardown
Emitted when a listitem is about to be destroyed.
Gtk.SignalListItemFactory::unbind
Emitted when a listitem has been removed from use in a list widget
and its new GtkListItem:item
is about to be unset.