3.9 KiB
STRUCT
CenterBox
GtkCenterBox arranges three children in a row, keeping the middle child
centered as well as possible.
To add children to GtkCenterBox, use [method@Gtk.CenterBox.set_start_widget],
[method@Gtk.CenterBox.set_center_widget] and
[method@Gtk.CenterBox.set_end_widget].
The sizing and positioning of children can be influenced with the align and expand properties of the children.
GtkCenterBox as GtkBuildable
The GtkCenterBox implementation of the GtkBuildable interface
supports placing children in the 3 positions by specifying “start”, “center”
or “end” as the “type” attribute of a <child> element.
CSS nodes
GtkCenterBox uses a single CSS node with the name “box”,
The first child of the GtkCenterBox will be allocated depending on the
text direction, i.e. in left-to-right layouts it will be allocated on the
left and in right-to-left layouts on the right.
In vertical orientation, the nodes of the children are arranged from top to bottom.
Accessibility
Until GTK 4.10, GtkCenterBox used the GTK_ACCESSIBLE_ROLE_GROUP role.
Starting from GTK 4.12, GtkCenterBox uses the GTK_ACCESSIBLE_ROLE_GENERIC role.
Properties
updateFunctions
Additional update functions for type extensions.
appearFunctions
Additional appear functions for type extensions.
accessibleRole
The accessible role of the given GtkAccessible implementation.
The accessible role cannot be changed once set.
centerWidget
The widget that is placed at the center position.
endWidget
The widget that is placed at the end position.
In vertical orientation, the end position is at the bottom. In horizontal orientation, the end position is at the trailing edge wrt. to the text direction.
shrinkCenterLast
Whether to shrink the center widget after other children.
By default, when there's no space to give all three children their natural widths, the start and end widgets start shrinking and the center child keeps natural width until they reach minimum width.
If set to FALSE, start and end widgets keep natural width and the
center widget starts shrinking instead.
startWidget
The widget that is placed at the start position.
In vertical orientation, the start position is at the top. In horizontal orientation, the start position is at the leading edge wrt. to the text direction.
app
The application.
window
The window.
Methods
init()
Initialize CenterBox.
container(modifiers:)
Get the widget's view storage.
- Parameter modifiers: The view modifiers.
- Returns: The view storage.
update(_:modifiers:updateProperties:)
Update the widget's view storage.
- Parameters:
- storage: The view storage.
- modifiers: The view modifiers.
- updateProperties: Whether to update the view's properties.
accessibleRole(_:)
The accessible role of the given GtkAccessible implementation.
The accessible role cannot be changed once set.
centerWidget(_:)
The widget that is placed at the center position.
endWidget(_:)
The widget that is placed at the end position.
In vertical orientation, the end position is at the bottom. In horizontal orientation, the end position is at the trailing edge wrt. to the text direction.
shrinkCenterLast(_:)
Whether to shrink the center widget after other children.
By default, when there's no space to give all three children their natural widths, the start and end widgets start shrinking and the center child keeps natural width until they reach minimum width.
If set to FALSE, start and end widgets keep natural width and the
center widget starts shrinking instead.
startWidget(_:)
The widget that is placed at the start position.
In vertical orientation, the start position is at the top. In horizontal orientation, the start position is at the leading edge wrt. to the text direction.