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How GtkListView and its factory work together
GtkListView displays items from a GListModel. It relies on both a model and a GtkListItemFactory: the model supplies items, and the factory supplies and updates the widgets used to present them. GTK maintains only a few widgets at a time and reuses list items as the visible content changes or the user scrolls. The GTK API documentation describes this reuse as a way to avoid potentially costly setup, but does not quantify a performance gain. GTK: GtkListItemFactory; GTK: GtkSignalListItemFactory
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Think of the factory as managing a reusable display slot. The slot has a widget structure, but the model object currently shown in it can change. That distinction is why the factory has separate lifecycle signals for creating the structure and associating it with data.
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What should go in setup, bind, unbind, and teardown?
| Signal | Responsibility | Typical work |
|---|---|---|
setup |
Create persistent row structure for a new list item. | Construct row widgets and set the list item’s child with gtk_list_item_set_child(). |
bind |
Associate the current model object with the structure created in setup. | Read the current item, update visible values, and connect notifications or actions tied to that item. |
unbind |
Undo current-item associations before the list item is reused. | Disconnect item-specific handlers and clear or reset values and state that belong to the departing item. |
teardown |
Reverse setup when the list item is being destroyed. | Release connections and other resources whose lifetime is the list item’s lifetime. |
setup runs first for a newly created list item, and its handler must set that item’s child widget. bind associates the current item with the established widgets; after binding, the item may be shown in a list widget. unbind is the inverse of that association, while teardown is the final cleanup corresponding to setup. GTK: setup signal; GTK: bind signal; GTK: unbind signal; GTK: GtkSignalListItemFactory lifecycle
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Follow the bind/unbind rhythm
An illustrative lifecycle for one reusable list item is:
setup(row-widget) → bind(item A) → unbind(item A) → bind(item B) → unbind(item B) → teardown(row-widget)
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This is a conceptual trace, not a promise of an exact number of signal calls. The view determines what it needs to display. The key point is that the same list item may be bound and unbound multiple times for different objects before it is eventually destroyed.
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Anything in bind whose lifetime belongs to the current model object should be undone before the list item is rebound. If you connect a notification or callback to that object, retain enough information to disconnect it in unbind. Clear or overwrite item-derived display state as appropriate. Otherwise, the reused widget can keep showing an earlier object’s value or respond to an earlier object’s handler.
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There is a useful distinction between per-item observers and observers of the list item itself. A connection to a current model object belongs with bind/unbind. For a property notification that should last as long as the list item, GTK’s class documentation recommends connecting in setup and removing the connection in teardown. GTK: GtkSignalListItemFactory
Attach a GtkSignalListItemFactory
In the GTK 4 C API, create a signal factory with gtk_signal_list_item_factory_new(), connect the handlers your row needs, and set it on the list view with gtk_list_view_set_factory(). Connect the signals before using the factory. The API references below document the C constructor and setter; bindings in other languages may use different names and ownership conventions.
- Create the factory: call
gtk_signal_list_item_factory_new(). GTK: gtk_signal_list_item_factory_new - Connect lifecycle handlers: connect
setup,bind,unbind, andteardownas needed for the row’s widget structure and data. - Set the list view’s factory: call
gtk_list_view_set_factory()after creating the view and connecting the handlers. GTK: gtk_list_view_set_factory
Check the GTK minor version used by your project and the conventions of its language binding before treating C API syntax or ownership behavior as directly transferable.
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GtkBuilderListItemFactory is an alternative when it is more natural to describe rows as a GtkBuilder UI template than to construct and update them in signal-handler code. For GtkListView, the template extends GtkListItem; GTK documents using GtkExpression to bind model data. The signal factory offers direct control over setup and management, while the builder factory instantiates the template and can express bindings declaratively. Choose according to how much lifecycle logic you need in code and whether expression-based binding suits the UI; these are alternative approaches, not factories that need to be combined. GTK: GtkBuilderListItemFactory; GTK: GtkSignalListItemFactory
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