Enum RelayoutError 

pub enum RelayoutError {
    NoLayout,
    ScaleDirty,
}

Reasons DocumentFlow::relayout_block may refuse an incremental update.

Both variants describe invariant violations the caller can detect structurally ahead of time by asking DocumentFlow::has_layout and DocumentFlow::layout_dirty_for_scale. Returned as a Result rather than panicking so a misbehaving caller produces a recoverable error at the exact call site instead of corrupting the flow with a partial relayout.

Variants

NoLayout

No layout_* method has been called on this flow yet. The caller must run DocumentFlow::layout_full or DocumentFlow::layout_blocks first to establish a baseline layout before incremental updates make sense.

ScaleDirty

The backing TextFontService has had its HiDPI scale factor changed since this flow was last laid out, so the existing block layouts hold advances at the old ppem. Re-shaping a single block would leave it at the new ppem while neighbors stay at the old, producing an inconsistent flow. The caller must re-run layout_full / layout_blocks to rebuild everything at the new scale.

Trait Implementations

impl Clone for RelayoutError

fn clone(&self) -> RelayoutError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RelayoutError

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

Formats the value using the given formatter.

impl Display for RelayoutError

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

Formats the value using the given formatter.

impl Error for RelayoutError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

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

Provides type-based access to context intended for error reports.

impl PartialEq for RelayoutError

fn eq(&self, other: &RelayoutError) -> 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 Copy for RelayoutError

impl Eq for RelayoutError

impl StructuralPartialEq for RelayoutError