Struct zng::data_context::DataNote

pub struct DataNote { /* private fields */ }

Represents an annotation set in a data context.

See DATA for more details.

Implementations

impl DataNote

pub fn new( source: WidgetId, level: DataNoteLevel, value: impl DataNoteValue + 'static, ) -> (DataNote, DataNoteHandle)

New note.

pub fn source(&self) -> WidgetId

Widget that set the annotation.

pub fn level(&self) -> DataNoteLevel

Annotation level.

pub fn value(&self) -> Option<Arc<dyn DataNoteValue>>

Annotation value.

Is None if the note was dropped since last cleanup.

pub fn retain(&self) -> bool

If the note is still valid.

Trait Implementations

impl Clone for DataNote

fn clone(&self) -> DataNote

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for DataNote

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

Formats the value using the given formatter.

impl Display for DataNote

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

Formats the value using the given formatter.

impl PartialEq for DataNote

fn eq(&self, other: &DataNote) -> 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.