FadeInImage.assetNetwork constructor
Creates a widget that uses a placeholder image stored in an asset bundle while loading the final image from the network.
placeholder
is the key of the image in the asset bundle.
image
is the URL of the final image.
placeholderScale
and imageScale
are passed to their respective
ImageProviders (see also ImageInfo.scale).
If placeholderScale
is omitted or is null, the pixel-density-aware asset
resolution will be attempted for the placeholder
image. Otherwise, the
exact asset specified will be used.
The placeholder
, image
, imageScale
, fadeOutDuration
,
fadeOutCurve
, fadeInDuration
, fadeInCurve
, alignment
, repeat
,
and matchTextDirection
arguments must not be null.
See also:
- new Image.asset, which has more details about loading images from asset bundles.
- new Image.network, which has more details about loading images from the network.
Implementation
FadeInImage.assetNetwork({
Key key,
@required String placeholder,
@required String image,
AssetBundle bundle,
double placeholderScale,
double imageScale = 1.0,
this.fadeOutDuration = const Duration(milliseconds: 300),
this.fadeOutCurve = Curves.easeOut,
this.fadeInDuration = const Duration(milliseconds: 700),
this.fadeInCurve = Curves.easeIn,
this.width,
this.height,
this.fit,
this.alignment = Alignment.center,
this.repeat = ImageRepeat.noRepeat,
this.matchTextDirection = false,
}) : assert(placeholder != null),
assert(image != null),
placeholder = placeholderScale != null
? ExactAssetImage(placeholder, bundle: bundle, scale: placeholderScale)
: AssetImage(placeholder, bundle: bundle),
assert(imageScale != null),
assert(fadeOutDuration != null),
assert(fadeOutCurve != null),
assert(fadeInDuration != null),
assert(fadeInCurve != null),
assert(alignment != null),
assert(repeat != null),
assert(matchTextDirection != null),
image = NetworkImage(image, scale: imageScale),
super(key: key);