ResourceImage class
Decodes the given Uint8List buffer as an image, associating it with the given scale.
The provided bytes buffer should not be changed after it is provided
to a ResourceImage. To provide an ImageStream that represents an image
that changes over time, consider creating a new subclass of ImageProvider
whose loadBuffer method returns a subclass of ImageStreamCompleter that can
handle providing multiple images.
See also:
- Image.memory for a shorthand of an Image widget backed by ResourceImage.
- Inheritance
-
- Object
- ImageProvider<
ResourceImage> - ResourceImage
Constructors
- ResourceImage(String drawablePath, {double scale = 1.0})
-
Creates an object that decodes a Uint8List buffer as an image.
const
Properties
- drawablePath → String
-
final
- hashCode → int
-
The hash code for this object.
no setteroverride
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- scale → double
-
The scale to place in the ImageInfo object of the image.
final
Methods
-
createStream(
ImageConfiguration configuration) → ImageStream -
Called by resolve to create the ImageStream it returns.
inherited
-
evict(
{ImageCache? cache, ImageConfiguration configuration = ImageConfiguration.empty}) → Future< bool> -
Evicts an entry from the image cache.
inherited
-
loadBuffer(
ResourceImage key, DecoderBufferCallback decode) → ImageStreamCompleter -
Converts a key into an ImageStreamCompleter, and begins fetching the
image.
override
-
loadImage(
ResourceImage key, ImageDecoderCallback decode) → ImageStreamCompleter -
Converts a key into an ImageStreamCompleter, and begins fetching the
image.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
obtainCacheStatus(
{required ImageConfiguration configuration, ImageErrorListener? handleError}) → Future< ImageCacheStatus?> -
Returns the cache location for the key that this ImageProvider creates.
inherited
-
obtainKey(
ImageConfiguration configuration) → Future< ResourceImage> -
Converts an ImageProvider's settings plus an ImageConfiguration to a key
that describes the precise image to load.
override
-
resolve(
ImageConfiguration configuration) → ImageStream -
Resolves this image provider using the given
configuration, returning an ImageStream.inherited -
resolveStreamForKey(
ImageConfiguration configuration, ImageStream stream, ResourceImage key, ImageErrorListener handleError) → void -
Called by resolve with the key returned by obtainKey.
inherited
-
toString(
) → String -
A string representation of this object.
override
Operators
-
operator ==(
Object other) → bool -
The equality operator.
override