Enum gtk4::PolicyType

#[non_exhaustive]
pub enum PolicyType {
    Always,
    Automatic,
    Never,
    External,
}

Determines how the size should be computed to achieve the one of the visibility mode for the scrollbars.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Always

The scrollbar is always visible. The view size is independent of the content.

Automatic

The scrollbar will appear and disappear as necessary. For example, when all of a TreeView can not be seen.

Never

The scrollbar should never appear. In this mode the content determines the size.

External

Don’t show a scrollbar, but don’t force the size to follow the content. This can be used e.g. to make multiple scrolled windows share a scrollbar.

Trait Implementations

impl Clone for PolicyType

fn clone(&self) -> PolicyType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PolicyType

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

Formats the value using the given formatter.

impl From<PolicyType> for Value

fn from(v: PolicyType) -> Self

Converts to this type from the input type.

impl<'a> FromValue<'a> for PolicyType

type Checker = GenericValueTypeChecker<PolicyType>

Value type checker.

unsafe fn from_value(value: &'a Value) -> Self

Get the contained value from a Value.

impl HasParamSpec for PolicyType

type ParamSpec = ParamSpecEnum

type SetValue = PolicyType

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

type BuilderFn = fn(_: &str, _: PolicyType) -> ParamSpecEnumBuilder<'_, PolicyType>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for PolicyType

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

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 Ord for PolicyType

fn cmp(&self, other: &PolicyType) -> 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 PartialEq for PolicyType

fn eq(&self, other: &PolicyType) -> 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 PartialOrd for PolicyType

fn partial_cmp(&self, other: &PolicyType) -> 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 PolicyType

fn static_type() -> Type

Returns the type identifier of Self.

impl ToValue for PolicyType

fn to_value(&self) -> Value

Convert a value to a Value.

fn value_type(&self) -> Type

Returns the type identifier of self.

impl ValueType for PolicyType

type Type = PolicyType

Type to get the Type from.

impl Copy for PolicyType

impl Eq for PolicyType

impl StructuralPartialEq for PolicyType