Struct ConstraintAdjustment

pub struct ConstraintAdjustment(/* private fields */);

constraint adjustments

The constraint adjustment value define ways the compositor will adjust the position of the surface, if the unadjusted position would result in the surface being partly constrained.

Whether a surface is considered ‘constrained’ is left to the compositor to determine. For example, the surface may be partly outside the compositor’s defined ‘work area’, thus necessitating the child surface’s position be adjusted until it is entirely inside the work area.

The adjustments can be combined, according to a defined precedence: 1) Flip, 2) Slide, 3) Resize.

Implementations

impl ConstraintAdjustment

pub const fn empty() -> Self

Get a flags value with all bits unset.

pub const fn all() -> Self

Get a flags value with all known bits set.

pub const fn bits(&self) -> u32

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

pub const fn from_bits(bits: u32) -> Option<Self>

Convert from a bits value.

This method will return None if any unknown bits are set.

pub const fn from_bits_truncate(bits: u32) -> Self

Convert from a bits value, unsetting any unknown bits.

pub const fn from_bits_retain(bits: u32) -> Self

Convert from a bits value exactly.

pub fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

pub const fn intersects(&self, other: Self) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

pub const fn contains(&self, other: Self) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

pub fn insert(&mut self, other: Self)

The bitwise or (|) of the bits in two flags values.

pub fn remove(&mut self, other: Self)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

pub fn toggle(&mut self, other: Self)

The bitwise exclusive-or (^) of the bits in two flags values.

pub fn set(&mut self, other: Self, value: bool)

Call insert when value is true or remove when value is false.

pub const fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

pub const fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.

pub const fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

pub const fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

pub const fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl ConstraintAdjustment

pub const fn iter(&self) -> Iter<ConstraintAdjustment>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

pub const fn iter_names(&self) -> IterNames<ConstraintAdjustment>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

impl ConstraintAdjustment

pub const None: Self = _

don’t move the child surface when constrained

Don’t alter the surface position even if it is constrained on some axis, for example partially outside the edge of an output.

pub const SlideX: Self = _

move along the x axis until unconstrained

Slide the surface along the x axis until it is no longer constrained.

First try to slide towards the direction of the gravity on the x axis until either the edge in the opposite direction of the gravity is unconstrained or the edge in the direction of the gravity is constrained.

Then try to slide towards the opposite direction of the gravity on the x axis until either the edge in the direction of the gravity is unconstrained or the edge in the opposite direction of the gravity is constrained.

pub const SlideY: Self = _

move along the y axis until unconstrained

Slide the surface along the y axis until it is no longer constrained.

First try to slide towards the direction of the gravity on the y axis until either the edge in the opposite direction of the gravity is unconstrained or the edge in the direction of the gravity is constrained.

Then try to slide towards the opposite direction of the gravity on the y axis until either the edge in the direction of the gravity is unconstrained or the edge in the opposite direction of the gravity is constrained.

pub const FlipX: Self = _

invert the anchor and gravity on the x axis

Invert the anchor and gravity on the x axis if the surface is constrained on the x axis. For example, if the left edge of the surface is constrained, the gravity is ‘left’ and the anchor is ‘left’, change the gravity to ‘right’ and the anchor to ‘right’.

If the adjusted position also ends up being constrained, the resulting position of the flip_x adjustment will be the one before the adjustment.

pub const FlipY: Self = _

invert the anchor and gravity on the y axis

Invert the anchor and gravity on the y axis if the surface is constrained on the y axis. For example, if the bottom edge of the surface is constrained, the gravity is ‘bottom’ and the anchor is ‘bottom’, change the gravity to ‘top’ and the anchor to ‘top’.

The adjusted position is calculated given the original anchor rectangle and offset, but with the new flipped anchor and gravity values.

If the adjusted position also ends up being constrained, the resulting position of the flip_y adjustment will be the one before the adjustment.

pub const ResizeX: Self = _

horizontally resize the surface

Resize the surface horizontally so that it is completely unconstrained.

pub const ResizeY: Self = _

vertically resize the surface

Resize the surface vertically so that it is completely unconstrained.

Trait Implementations

impl Binary for ConstraintAdjustment

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

Formats the value using the given formatter.

impl BitAnd for ConstraintAdjustment

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

The bitwise and (&) of the bits in two flags values.

type Output = ConstraintAdjustment

The resulting type after applying the & operator.

impl BitAndAssign for ConstraintAdjustment

fn bitand_assign(&mut self, other: Self)

The bitwise and (&) of the bits in two flags values.

impl BitOr for ConstraintAdjustment

fn bitor(self, other: ConstraintAdjustment) -> Self

The bitwise or (|) of the bits in two flags values.

type Output = ConstraintAdjustment

The resulting type after applying the | operator.

impl BitOrAssign for ConstraintAdjustment

fn bitor_assign(&mut self, other: Self)

The bitwise or (|) of the bits in two flags values.

impl BitXor for ConstraintAdjustment

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

The bitwise exclusive-or (^) of the bits in two flags values.

type Output = ConstraintAdjustment

The resulting type after applying the ^ operator.

impl BitXorAssign for ConstraintAdjustment

fn bitxor_assign(&mut self, other: Self)

The bitwise exclusive-or (^) of the bits in two flags values.

impl Clone for ConstraintAdjustment

fn clone(&self) -> ConstraintAdjustment

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ConstraintAdjustment

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

Formats the value using the given formatter.

impl Extend<ConstraintAdjustment> for ConstraintAdjustment

fn extend<T: IntoIterator<Item = Self>>(&mut self, iterator: T)

The bitwise or (|) of the bits in each flags value.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Flags for ConstraintAdjustment

const FLAGS: &'static [Flag<ConstraintAdjustment>] = _

The set of defined flags.

type Bits = u32

The underlying bits type.

fn bits(&self) -> u32

Get the underlying bits value.

fn from_bits_retain(bits: u32) -> ConstraintAdjustment

Convert from a bits value exactly.

fn empty() -> Self

Get a flags value with all bits unset.

fn all() -> Self

Get a flags value with all known bits set.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.

fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

fn iter(&self) -> Iter<Self>

Yield a set of contained flags values.

fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values.

fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

fn intersects(&self, other: Self) -> bool

where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.

fn contains(&self, other: Self) -> bool

where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.

fn insert(&mut self, other: Self)

where Self: Sized,

The bitwise or (|) of the bits in two flags values.

fn remove(&mut self, other: Self)

where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!).

fn toggle(&mut self, other: Self)

where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.

fn set(&mut self, other: Self, value: bool)

where Self: Sized,

Call Flags::insert when value is true or Flags::remove when value is false.

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

The bitwise and (&) of the bits in two flags values.

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

The bitwise or (|) of the bits in two flags values.

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

The intersection of a source flags value with the complement of a target flags value (&!).

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

The bitwise exclusive-or (^) of the bits in two flags values.

fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl From<ConstraintAdjustment> for u32

fn from(val: ConstraintAdjustment) -> u32

Converts to this type from the input type.

impl FromIterator<ConstraintAdjustment> for ConstraintAdjustment

fn from_iter<T: IntoIterator<Item = Self>>(iterator: T) -> Self

The bitwise or (|) of the bits in each flags value.

impl Hash for ConstraintAdjustment

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 IntoIterator for ConstraintAdjustment

type Item = ConstraintAdjustment

The type of the elements being iterated over.

type IntoIter = Iter<ConstraintAdjustment>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl LowerHex for ConstraintAdjustment

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

Formats the value using the given formatter.

impl Not for ConstraintAdjustment

fn not(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

type Output = ConstraintAdjustment

The resulting type after applying the ! operator.

impl Octal for ConstraintAdjustment

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

Formats the value using the given formatter.

impl PartialEq for ConstraintAdjustment

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PublicFlags for ConstraintAdjustment

type Primitive = u32

The type of the underlying storage.

type Internal = InternalBitFlags

The type of the internal field on the generated flags type.

impl Sub for ConstraintAdjustment

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

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

type Output = ConstraintAdjustment

The resulting type after applying the - operator.

impl SubAssign for ConstraintAdjustment

fn sub_assign(&mut self, other: Self)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

impl TryFrom<u32> for ConstraintAdjustment

type Error = ()

The type returned in the event of a conversion error.

fn try_from(val: u32) -> Result<ConstraintAdjustment, ()>

Performs the conversion.

impl UpperHex for ConstraintAdjustment

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

Formats the value using the given formatter.

impl Copy for ConstraintAdjustment

impl Eq for ConstraintAdjustment

impl StructuralPartialEq for ConstraintAdjustment