Enum PermissionDiffEvent 

#[repr(C, u8)]
pub enum PermissionDiffEvent {
    Subscribe {
        capability: Capability,
        node_id: DomNodeId,
    },
    Release {
        capability: Capability,
    },
    Reconfigure {
        capability: Capability,
    },
}

Diff event emitted at the end of each layout pass for the platform backend to translate into native subscribe / release / reconfigure calls.

Subscribe fires the first time a capability’s refcount transitions from zero to one (i.e. the first permission-bearing node of its kind appears). Release fires when the refcount drops back to zero. Reconfigure is reserved for in-place parameter changes (e.g. camera-facing front → back) once CameraPreview lands as a NodeType — kept in the enum so platform backends can ignore it cleanly until then.

Variants

Subscribe

First appearance of capability in the layout. Refcount went 0 → 1.

Fields

capability: Capability

node_id: DomNodeId

Release

Last bearing node left the layout. Refcount went 1 → 0.

Fields

capability: Capability

Reconfigure

Reserved for future use — currently never emitted. The diff path will fire it once CameraPreview etc. land with parameter fields.

Fields

capability: Capability

Trait Implementations

impl Clone for PermissionDiffEvent

fn clone(&self) -> PermissionDiffEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PermissionDiffEvent

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

Formats the value using the given formatter.

impl PartialEq for PermissionDiffEvent

fn eq(&self, other: &PermissionDiffEvent) -> 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 Eq for PermissionDiffEvent

impl StructuralPartialEq for PermissionDiffEvent