Struct gtk4::Scrollable

pub struct Scrollable { /* private fields */ }

Scrollable is an interface for widgets with native scrolling ability.

To implement this interface you should override the hadjustment and vadjustment properties.

Creating a scrollable widget

All scrollable widgets should do the following.

• When a parent widget sets the scrollable child widget’s adjustments, the widget should connect to the value-changed signal. The child widget should then populate the adjustments’ properties as soon as possible, which usually means queueing an allocation right away and populating the properties in the WidgetImpl::size_allocate() implementation.

• Because its preferred size is the size for a fully expanded widget, the scrollable widget must be able to cope with underallocations. This means that it must accept any value passed to its WidgetImpl::size_allocate() implementation.

• When the parent allocates space to the scrollable child widget, the widget must ensure the adjustments’ property values are correct and up to date, for example using AdjustmentExt::configure().

• When any of the adjustments emits the value-changed signal, the scrollable widget should scroll its contents.

Properties

hadjustment

Horizontal Adjustment of the scrollable widget.

This adjustment is shared between the scrollable widget and its parent.

Readable | Writeable | Construct

hscroll-policy

Determines when horizontal scrolling should start.

Readable | Writeable

vadjustment

Vertical Adjustment of the scrollable widget.

This adjustment is shared between the scrollable widget and its parent.

Readable | Writeable | Construct

vscroll-policy

Determines when vertical scrolling should start.

Readable | Writeable

Implements

ScrollableExt

Implementations

impl Scrollable

pub const NONE: Option<&'static Scrollable> = None

Trait Implementations

impl Clone for Scrollable

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Scrollable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl HasParamSpec for Scrollable

type ParamSpec = ParamSpecObject

type SetValue = Scrollable

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, Scrollable>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for Scrollable

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T: ScrollableImpl> IsImplementable<T> for Scrollable

fn interface_init(iface: &mut Interface<Self>)

Override the virtual methods of this interface for the given subclass and do other interface initialization.

fn instance_init(_instance: &mut InitializingObject<T>)

Instance specific initialization.

impl Ord for Scrollable

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl<OT: ObjectType> PartialEq<OT> for Scrollable

fn eq(&self, other: &OT) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<OT: ObjectType> PartialOrd<OT> for Scrollable

fn partial_cmp(&self, other: &OT) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for Scrollable

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for Scrollable

impl IsA<Scrollable> for ColumnView

impl IsA<Scrollable> for GridView

impl IsA<Scrollable> for IconView

impl IsA<Scrollable> for ListBase

impl IsA<Scrollable> for ListView

impl IsA<Scrollable> for TextView

impl IsA<Scrollable> for TreeView

impl IsA<Scrollable> for Viewport