Enum FrameTrigger 

pub enum FrameTrigger {
    Other,
    Initial,
    Resize,
    Pointer,
    Keyboard,
    Animation,
    ShaderPaint,
    Periodic,
    External,
}

Why the current frame is being built. Hosts set this before each request_redraw so apps that surface a diagnostic overlay can show what kind of input is driving the redraw cadence.

Other is the conservative default: it covers redraws the host can’t attribute. Specific variants narrow the reason when the host can.

Variants

Other

Host can’t attribute the redraw to a specific cause.

Initial

Initial paint after surface configuration.

Resize

Surface resize / DPI change.

Pointer

Pointer move, button, or wheel.

Keyboard

Keyboard / IME input.

Animation

Inside-out animation deadline elapsed (one of the visible widgets asked for a future frame via redraw_within, or a visual animation is still settling). Drives the layout-path (full rebuild + prepare).

ShaderPaint

Time-driven shader deadline elapsed (e.g. stock spinner / skeleton / progress-indeterminate, or a custom shader registered with samples_time=true). Drives the paint-only path: frame.time advances but layout state is unchanged.

Periodic

Periodic host-config cadence (HostConfig::redraw_interval).

External

Application code asked for a frame through the host’s external wakeup handle (push-driven event-class data — a chat message arrived, a background task advanced state). Data changed outside the tree, so this drives the layout path (full rebuild

• prepare), never paint-only.

Implementations

impl FrameTrigger

pub fn label(self) -> &'static str

Short, fixed-width tag for diagnostic overlays.

Trait Implementations

impl Clone for FrameTrigger

fn clone(&self) -> FrameTrigger

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FrameTrigger

impl Debug for FrameTrigger

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

Formats the value using the given formatter.

impl Default for FrameTrigger

fn default() -> FrameTrigger

Returns the “default value” for a type.

impl Eq for FrameTrigger

impl PartialEq for FrameTrigger

fn eq(&self, other: &FrameTrigger) -> 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 StructuralPartialEq for FrameTrigger