Struct gtk4::MapListModel[][src]

pub struct MapListModel(_);
Expand description

A MapListModel maps the items in a list model to different items.

MapListModel uses a `callback::Gtk::MapListModelMapFunc.

Example: Create a list of GtkEventControllers ⚠️ The following code is in c ⚠️

static gpointer
map_to_controllers (gpointer widget,
                    gpointer data)
{
  gpointer result = gtk_widget_observe_controllers (widget);
  g_object_unref (widget);
  return result;
}

widgets = gtk_widget_observe_children (widget);

controllers = gtk_map_list_model_new (G_TYPE_LIST_MODEL,
                                      widgets,
                                      map_to_controllers,
                                      NULL, NULL);

model = gtk_flatten_list_model_new (GTK_TYPE_EVENT_CONTROLLER,
                                    controllers);

MapListModel will attempt to discard the mapped objects as soon as they are no longer needed and recreate them if necessary.

Implements

glib::ObjectExt, gio::prelude::ListModelExt

Implementations

Creates a new MapListModel for the given arguments.

model

The model to map or None for none

map_func

map function or None to not map items

Returns

a new MapListModel

Gets the model that is currently being mapped or None if none.

Returns

The model that gets mapped

Checks if a map function is currently set on self.

Returns

true if a map function is set

Sets the function used to map items.

The function will be called whenever an item needs to be mapped and must return the item to use for the given input item.

Note that MapListModel may call this function multiple times on the same item, because it may delete items it doesn’t need anymore.

GTK makes no effort to ensure that map_func conforms to the item type of self. It assumes that the caller knows what they are doing and the map function returns items of the appropriate type.

map_func

map function or None to not map items

Sets the model to be mapped.

GTK makes no effort to ensure that model conforms to the item type expected by the map function. It assumes that the caller knows what they are doing and have set up an appropriate map function.

model

The model to be mapped

Trait Implementations

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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

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