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
-
- Object
- ImageProvider<
DeviceImage> - DeviceImage
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