Description

Gnome::Gtk4::Viewport implements scrollability for widgets that lack their own scrolling capabilities.

Use Gnome::Gtk4::Viewport to scroll child widgets such as Gnome::Gtk4::Grid, Gnome::Gtk4::Box, and so on.

The Gnome::Gtk4::Viewport will start scrolling content only if allocated less than the child widget’s minimum size in a given orientation.

CSS nodes

Gnome::Gtk4::Viewport has a single CSS node with name viewport.

Until GTK 4.10, Gnome::Gtk4::Viewport used the GTK_ACCESSIBLE_ROLE_GROUP role.

Starting from GTK 4.12, Gnome::Gtk4::Viewport uses the GTK_ACCESSIBLE_ROLE_GENERIC role.

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

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

Creates a new Gnome::Gtk4::Viewport.

The new viewport uses the given adjustments, or default adjustments if none are given.

method new-viewport ( N-Object() $hadjustment, N-Object() $vadjustment --> Gnome::Gtk4::Viewport \)

Gets the child widget of $viewport.

method get-child (--> N-Object )

Return value; the child widget of $viewport.

Gets whether the viewport is scrolling to keep the focused child in view.

method get-scroll-to-focus (--> Bool )

Return value; True if the viewport keeps the focus child scrolled to view.

Scrolls a descendant of the viewport into view.

The viewport and the descendant must be visible and mapped for this function to work, otherwise no scrolling will be performed.

method scroll-to ( N-Object() $descendant, N-Object $scroll )

$descendant; a descendant widget of the viewport.
$scroll; (transfer ownership: full) details of how to perform the scroll operation or NULL to scroll into view

Sets the child widget of $viewport.

method set-child ( N-Object() $child )

Sets whether the viewport should automatically scroll to keep the focused child in view.

method set-scroll-to-focus ( Bool() $scroll-to-focus )