Interface SectionModel.SectionsChangedCallback

All Superinterfaces:

FunctionPointer

Enclosing interface:

SectionModel<T extends GObject>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface SectionModel.SectionsChangedCallback
extends FunctionPointer

Functional interface declaration of the SectionsChangedCallback callback.

Since:

4.12

See Also:

• run(int, int)

Method Summary

Modifier and Type	Method	Description
void	run(int position, int nItems)	Emitted when the start-of-section state of some of the items in model changes.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(MemorySegment, int, int) method.
default void	upcall(MemorySegment sourceSectionModel, int position, int nItems)	The upcall method is called from native code.

Method Details

run

void run(int position,
 int nItems)

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 Gio.ListModel::items-changed implies the effect of the Gtk.SectionModel::sections-changed signal for all the items it covers.

Since:

4.12

upcall

default void upcall(MemorySegment sourceSectionModel,
 int position,
 int nItems)

The upcall method is called from native code. The parameters are marshaled and run(int, int) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(MemorySegment, int, int) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the arena in which the function pointer is allocated

Returns:

the native function pointer