Enum StructureChange 

pub enum StructureChange {
    None,
    Children,
    Described,
    Rebuild,
}

What a structural change a subtree reported (Widget::take_structure_change) asks of its host. Ordered: a change joined with a larger one is the larger.

Variants

None

Nothing was inserted or removed.

Children

The widgets that reported it mount and unmount children of their own, and every widget stays alive: they carry it out in the retained tree in place (Widget::remount_children), and their own damage covers every pixel that changed. A host that cannot rebuilds its tree, as for Self::Described.

Described

The host rebuilds its tree, but the frame’s damage still describes it: the widget that reported it replaced only widgets of its own, and its own damage this frame covers every pixel that changed with them.

Rebuild

The host rebuilds its tree, and any widget may have been replaced: the frame repaints whole.

Implementations

impl StructureChange

pub fn of(dirty: bool) -> StructureChange

A structural flag as a change: any change is a Self::Rebuild.

pub fn rebuilds(self) -> bool

Whether the host rebuilds its tree for it, or (for Self::Children) changes it in place.

pub fn join(self, other: StructureChange) -> StructureChange

This change and other, as one.

pub fn of_children(children: Vec<&mut dyn Widget>) -> StructureChange

Every one of children’s changes, joined: for a container that adds no structure of its own, so a change a child carries out in place (Self::Children) stays one. Each child’s change is taken, none skipped.

Trait Implementations

impl Clone for StructureChange

fn clone(&self) -> StructureChange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StructureChange

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

Formats the value using the given formatter.

impl Default for StructureChange

fn default() -> StructureChange

Returns the “default value” for a type.

impl Ord for StructureChange

fn cmp(&self, other: &StructureChange) -> 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,

Restrict a value to a certain interval.

impl PartialEq for StructureChange

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

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl Copy for StructureChange

impl Eq for StructureChange

impl StructuralPartialEq for StructureChange