Package ch.bailu.gtk.gtk

Class SignalListItemFactory

java.lang.Object
ch.bailu.gtk.type.Type
ch.bailu.gtk.type.Pointer
ch.bailu.gtk.gobject.Object
ch.bailu.gtk.gtk.ListItemFactory
ch.bailu.gtk.gtk.SignalListItemFactory
All Implemented Interfaces:
PointerInterface
public class SignalListItemFactory extends ListItemFactory
`GtkSignalListItemFactory` is a `GtkListItemFactory` that emits signals
to to manage listitems.

Signals are emitted for every listitem in the same order:

1. [signal@Gtk.SignalListItemFactory::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.

2. [signal@Gtk.SignalListItemFactory::bind] is emitted to bind the item passed
via [property@Gtk.ListItem: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.

3. [signal@Gtk.SignalListItemFactory::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.

4. [signal@Gtk.SignalListItemFactory::bind] and
[signal@Gtk.SignalListItemFactory::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.

5. [signal@Gtk.SignalListItemFactory::teardown] is emitted to allow undoing
the effects of [signal@Gtk.SignalListItemFactory::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
`GtkListItem`s 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
[signal@Gtk.SignalListItemFactory::setup] signal and removed again during
[signal@Gtk.SignalListItemFactory::teardown].

https://docs.gtk.org/gtk4/class.SignalListItemFactory.html