SignalListItemFactory

class SignalListItemFactory(**properties: Any)

Superclasses: ListItemFactory, Object

GtkSignalListItemFactory is a GtkListItemFactory that emits signals to manage listitems.

Signals are emitted for every listitem in the same order:

1. 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. bind is emitted to bind the item passed via 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. 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. bind and 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. teardown is emitted to allow undoing the effects of 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 listitems passed will not trigger notify signals as the listitem’s notifications are frozen. See freeze_notify() for details.

For tracking changes in other properties in the listitem, the ::notify signal is recommended. The signal can be connected in the setup signal and removed again during teardown.

Constructors

class SignalListItemFactory

classmethod new() → ListItemFactory

Creates a new GtkSignalListItemFactory.

You need to connect signal handlers before you use it.

Signals

class SignalListItemFactory.signals

bind(object: Object) → None

Emitted when an object has been bound, for example when a new item has been set on a listitem and should be bound for use.

After this signal was emitted, the object might be shown in a ListView or other widget.

The unbind signal is the opposite of this signal and can be used to undo everything done in this signal.

Parameters:

object – The GObject to bind

setup(object: Object) → None

Emitted when a new listitem has been created and needs to be setup for use.

It is the first signal emitted for every listitem.

The teardown signal is the opposite of this signal and can be used to undo everything done in this signal.

Parameters:

object – The GObject to set up

teardown(object: Object) → None

Emitted when an object is about to be destroyed.

It is the last signal ever emitted for this object.

This signal is the opposite of the setup signal and should be used to undo everything done in that signal.

Parameters:

object – The GObject to tear down

unbind(object: Object) → None

Emitted when an object has been unbound from its item, for example when a listitem was removed from use in a list widget and its item is about to be unset.

This signal is the opposite of the bind signal and should be used to undo everything done in that signal.

Parameters:

object – The GObject to unbind