Description

Gnome::Gtk4::CustomLayout uses closures for size negotiation.

A Gnome::Gtk4::CustomLayout uses closures matching to the old Gnome::Gtk4::Widget virtual functions for size negotiation, as a convenience API to ease the porting towards the corresponding Gnome::Gtk4::LayoutManager virtual functions.

Class initialization

new

:native-object

Create an object using a native object from elsewhere. See also Gnome::N::TopLevelSupportClass.

multi method new ( N-Object :$native-object! )

new-customlayout

Creates a new legacy layout manager.

Legacy layout managers map to the old Gnome::Gtk4::Widget size negotiation virtual functions, and are meant to be used during the transition from layout containers to layout manager delegates.

method new-customlayout ( &request-mode, &measure, &allocate --> Gnome::Gtk4::CustomLayout \)

• &request-mode; a function to retrieve the enumeration GtkSizeRequestMode defined in Gnome::Gtk4::T-enums of the widget using the layout; the default request mode is GTK_SIZE_REQUEST_CONSTANT_SIZE. Tthe function must be specified with following signature; :( N-Object $widget -- GEnum )>.

• &measure; a function to measure the widget using the layout manager. Tthe function must be specified with following signature; :( N-Object $widget, GEnum $orientation, gint $for-size, gint-ptr $minimum, gint-ptr $natural, gint-ptr $minimum-baseline, gint-ptr $natural-baseline ).

• &allocate; a function to allocate the children of the widget using the layout manager. Tthe function must be specified with following signature; :( N-Object $widget, gint $width, gint $height, gint $baseline ).