Struct gegl::MetadataStore

#[repr(transparent)]
pub struct MetadataStore { /* private fields */ }

This is an Abstract Base Class, you cannot instantiate it.

Properties

artist

Name of image creator.

Readable | Writeable

comment

Miscellaneous comment; conversion from GIF comment.

Readable | Writeable

copyright

Copyright notice.

Readable | Writeable

description

Description of image (possibly long).

Readable | Writeable

disclaimer

Legal disclaimer.

Readable | Writeable

file-module-name

Current file loader/saver module name. Valid only while a Metadata mapping is registered. This property is mainly provided for use in signal handlers.

Readable

resolution-unit

A ResolutionUnit specifying units for the image resolution (density).

Readable | Writeable

resolution-x

X resolution or density in dots per unit.

Readable | Writeable

resolution-y

Y resolution or density in dots per unit.

Readable | Writeable

software

Software used to create the image.

Readable | Writeable

source

Device used to create the image.

Readable | Writeable

timestamp

Time of original image creation.

Readable | Writeable

title

Short (one line) title or caption for image.

Readable | Writeable

warning

Warning of nature of content.

Readable | Writeable

Signals

changed

::changed is emitted when a metadata value is changed. This is analogous to the GObject::notify signal.

Detailed

generate-value

If a signal handler is connected to ::generate-value a signal is emitted when the file module accesses a value using gegl_metadata_get_value(). The signal handler must generate a value of the type specified in the pspec argument. The signal handler’s return value indicates the success of the operation.

If no handler is connected the mapped metadata value is accessed normally,

Detailed

mapped

::mapped is emitted after a file module registers a mapping and before other processing takes place. An application may respond to the signal by registering additional mappings or overriding existing values, for example it might override the TIFF ImageDescription tag to format multiple metadata values into the description.

parse-value

If a signal handler is connected to ::parse-value a signal is emitted when the file module accesses a value using gegl_metadata_set_value(). The signal handler should parse the value supplied in the [glib::Value][crate::glib::Value] and may set any number of metadata values using MetadataStoreExt::set_value().

If no handler is connected the mapped metadata value is set normally,

Detailed

unmapped

::unmapped is emitted when a file module tries to look up an unmapped metadata name. When the handler returns a second attempt is made to look up the metadata.

Implements

MetadataStoreExt, MetadataExt

GLib type: GObject with reference counted clone semantics.

Implementations

impl MetadataStore

pub const NONE: Option<&'static MetadataStore> = None

Trait Implementations

impl Clone for MetadataStore

fn clone(&self) -> Self

Makes a clone of this shared reference.

This increments the strong reference count of the object. Dropping the object will decrement it again.

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

Performs copy-assignment from source.

impl Debug for MetadataStore

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

Formats the value using the given formatter.

impl HasParamSpec for MetadataStore

type ParamSpec = ParamSpecObject

type SetValue = MetadataStore

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, MetadataStore>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for MetadataStore

fn hash<H>(&self, state: &mut H)where H: Hasher,

Hashes the memory address of this object.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for MetadataStore

fn cmp(&self, other: &Self) -> Ordering

Comparison for two GObjects.

Compares the memory addresses of the provided objects.

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl ParentClassIs for MetadataStore

type Parent = Object

impl<OT: ObjectType> PartialEq<OT> for MetadataStore

fn eq(&self, other: &OT) -> bool

Equality for two GObjects.

Two GObjects are equal if their memory addresses are equal.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<OT: ObjectType> PartialOrd<OT> for MetadataStore

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

Partial comparison for two GObjects.

Compares the memory addresses of the provided objects.

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl StaticType for MetadataStore

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for MetadataStore

impl IsA<Metadata> for MetadataStore

impl IsA<MetadataStore> for MetadataHash