SectionModel

Added in version 4.12.

class SectionModel(*args, **kwargs)

Implementations: FilterListModel, FlattenListModel, MapListModel, MultiSelection, NoSelection, SingleSelection, SliceListModel, SortListModel

GtkSectionModel is an interface that adds support for sections to list models.

A GtkSectionModel groups successive items into so-called sections. List widgets like GtkListView and GtkGridView then allow displaying section headers for these sections by installing a header factory.

Many GTK list models support sections inherently, or they pass through the sections of a model they are wrapping.

When the section groupings of a model change, the model will emit the sections_changed signal by calling the sections_changed function. All sections in the given range then need to be queried again. The items_changed signal has the same effect, all sections in that range are invalidated, too.

Methods

class SectionModel

get_section(position: int) → tuple[int, int]

Query the section that covers the given position. The number of items in the section can be computed by out_end - out_start.

If the position is larger than the number of items, a single range from n_items to G_MAXUINT will be returned.

Added in version 4.12.

Parameters:

position – the position of the item to query

sections_changed(position: int, n_items: int) → None

This function emits the sections_changed signal to notify about changes to sections.

It must cover all positions that used to be a section start or that are now a section start. It does not have to cover all positions for which the section has changed.

The items_changed implies the effect of the sections_changed signal for all the items it covers.

It is recommended that when changes to the items cause section changes in a larger range, that the larger range is included in the emission of the items_changed instead of emitting two signals.

Added in version 4.12.

Parameters:

• position – the first changed item

• n_items – the number of changed items

Signals

class SectionModel.signals

sections_changed(position: int, n_items: int) → None

The type of the None singleton.

Added in version 4.12.

Parameters:

• position – The first item that may have changed

• n_items – number of items with changes

Virtual Methods

class SectionModel

do_get_section(position: int) → tuple[int, int]

Query the section that covers the given position. The number of items in the section can be computed by out_end - out_start.

If the position is larger than the number of items, a single range from n_items to G_MAXUINT will be returned.

Added in version 4.12.

Parameters:

position – the position of the item to query