gtk.section_model_mixin
Module for [SectionModel] interface mixin
Templates 2
[gtk.section_model.SectionModel] is an interface that adds support for sections to list models.
A [gtk.section_model.SectionModel] groups successive items into so-called sections. List widgets like [gtk.list_view.ListView] and [gtk.grid_view.GridView] 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 signal@Gtk.SectionModel::sections-changed signal by calling the [gtk.section_model.SectionModel.sectionsChanged] function. All sections in the given range then need to be queried again. The signal@Gio.ListModel::items-changed signal has the same effect, all sections in that range are invalidated, too.
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.
Parameters
position | the position of the item to query |
outStart | the position of the first item in the section |
outEnd | the position of the first item not part of the section anymore. |
Connect to SectionsChanged signal.
Emitted when the start-of-section state of some of the items in model changes.
Note that this signal does not specify the new section state of the items, they need to be queried manually. It is also not necessary for a model to change the section state of any of the items in the section model, though it would be rather useless to emit such a signal.
The signalGio.ListModel::items-changed implies the effect of the signalGtk.SectionModel::sections-changed signal for all the items it covers.
Parameters
callback | signal callback delegate or function to connect void callback(uint position, uint nItems, gtk.section_model.SectionModel sectionModel) position The first item that may have changed (optional) nItems number of items with changes (optional) sectionModel the instance the signal is connected to (optional) |
after | Yes.After to execute callback after default handler, No.After to execute before (default) |