DeviceImage class

Decodes the given LocalImage object as an ImageProvider, associating it with the given scale.

In general only the constructor of this object should be used directly, after that use the resulting object wherever an ImageProvider is needed in Flutter. In particular with an Image widget.

Inheritance

Constructors

DeviceImage(LocalImage localImage, {double scale = 1.0, int minPixels = 0, int? compression})
Creates an object that decodes a LocalImage as an image.
const

Properties

compression int?
Optional image compression (0-100), default is set to 70.
final
hashCode int
The hash code for this object.
no setteroverride
height int
no setter
localImage LocalImage
The LocalImage to decode into an image.
final
minPixels int
The minPixels to place in the ImageInfo object of the image.
final
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
width int
no setter

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
load(DeviceImage key, dynamic decoder) ImageStreamCompleter
loadBuffer(DeviceImage key, DecoderBufferCallback decode) ImageStreamCompleter
Converts a key into an ImageStreamCompleter, and begins fetching the image.
inherited
loadImage(DeviceImage 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<DeviceImage>
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, DeviceImage key, ImageErrorListener handleError) → void
Called by resolve with the key returned by obtainKey.
override
shouldCache() bool
toString() String
A string representation of this object.
override

Operators

operator ==(dynamic other) bool
The equality operator.
override

Static Properties

noImageBase64 String
final
noImageBytes Uint8List
final