Struct gtk4::LayoutManager
source · #[repr(transparent)]pub struct LayoutManager { /* private fields */ }
Expand description
Layout managers are delegate classes that handle the preferred size and the allocation of a widget.
You typically subclass LayoutManager
if you want to implement a
layout policy for the children of a widget, or if you want to determine
the size of a widget depending on its contents.
Each Widget
can only have a LayoutManager
instance associated
to it at any given time; it is possible, though, to replace the layout
manager instance using WidgetExt::set_layout_manager()
.
Layout properties
A layout manager can expose properties for controlling the layout of
each child, by creating an object type derived from LayoutChild
and installing the properties on it as normal GObject
properties.
Each LayoutChild
instance storing the layout properties for a
specific child is created through the LayoutManagerExt::layout_child()
method; a LayoutManager
controls the creation of its LayoutChild
instances by overriding the GtkLayoutManagerClass.create_layout_child()
virtual function. The typical implementation should look like:
⚠️ The following code is in c ⚠️
static GtkLayoutChild *
create_layout_child (GtkLayoutManager *manager,
GtkWidget *container,
GtkWidget *child)
{
return g_object_new (your_layout_child_get_type (),
"layout-manager", manager,
"child-widget", child,
NULL);
}
The layout-manager
and
child-widget
properties
on the newly created LayoutChild
instance are mandatory. The
LayoutManager
will cache the newly created LayoutChild
instance
until the widget is removed from its parent, or the parent removes the
layout manager.
Each LayoutManager
instance creating a LayoutChild
should use
LayoutManagerExt::layout_child()
every time it needs to query
the layout properties; each LayoutChild
instance should call
LayoutManagerExt::layout_changed()
every time a property is
updated, in order to queue a new size measuring and allocation.
This is an Abstract Base Class, you cannot instantiate it.
Implements
Implementations§
source§impl LayoutManager
impl LayoutManager
pub const NONE: Option<&'static LayoutManager> = None
Trait Implementations§
source§impl Clone for LayoutManager
impl Clone for LayoutManager
source§impl Debug for LayoutManager
impl Debug for LayoutManager
source§impl Display for LayoutManager
impl Display for LayoutManager
source§impl HasParamSpec for LayoutManager
impl HasParamSpec for LayoutManager
type ParamSpec = ParamSpecObject
§type SetValue = LayoutManager
type SetValue = LayoutManager
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, LayoutManager>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for LayoutManager
impl Hash for LayoutManager
source§impl<T: LayoutManagerImpl> IsSubclassable<T> for LayoutManager
impl<T: LayoutManagerImpl> IsSubclassable<T> for LayoutManager
source§fn class_init(class: &mut Class<Self>)
fn class_init(class: &mut Class<Self>)
source§fn instance_init(instance: &mut InitializingObject<T>)
fn instance_init(instance: &mut InitializingObject<T>)
source§impl Ord for LayoutManager
impl Ord for LayoutManager
source§impl ParentClassIs for LayoutManager
impl ParentClassIs for LayoutManager
source§impl<OT: ObjectType> PartialEq<OT> for LayoutManager
impl<OT: ObjectType> PartialEq<OT> for LayoutManager
source§impl<OT: ObjectType> PartialOrd<OT> for LayoutManager
impl<OT: ObjectType> PartialOrd<OT> for LayoutManager
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for LayoutManager
impl StaticType for LayoutManager
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for LayoutManager
impl IsA<LayoutManager> for BinLayout
impl IsA<LayoutManager> for BoxLayout
impl IsA<LayoutManager> for CenterLayout
impl IsA<LayoutManager> for ConstraintLayout
impl IsA<LayoutManager> for FixedLayout
impl IsA<LayoutManager> for GridLayout
impl IsA<LayoutManager> for OverlayLayout
Auto Trait Implementations§
impl RefUnwindSafe for LayoutManager
impl !Send for LayoutManager
impl !Sync for LayoutManager
impl Unpin for LayoutManager
impl UnwindSafe for LayoutManager
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