Image.memory constructor

Image.memory(Uint8List bytes, { Key key, double scale: 1.0, ImageFrameBuilder frameBuilder, String semanticLabel, bool excludeFromSemantics: false, double width, double height, Color color, BlendMode colorBlendMode, BoxFit fit, AlignmentGeometry alignment: Alignment.center, ImageRepeat repeat: ImageRepeat.noRepeat, Rect centerSlice, bool matchTextDirection: false, bool gaplessPlayback: false, FilterQuality filterQuality: FilterQuality.low })

Creates a widget that displays an ImageStream obtained from a Uint8List.

The bytes, scale, and repeat arguments must not be null.

This only accepts compressed image formats (e.g. PNG). Uncompressed formats like rawRgba (the default format of ui.Image.toByteData) will lead to exceptions.

Either the width and height arguments should be specified, or the widget should be placed in a context that sets tight layout constraints. Otherwise, the image dimensions will change as the image is loaded, which will result in ugly layout changes.

Use filterQuality to change the quality when scaling an image. Use the FilterQuality.low quality setting to scale the image, which corresponds to bilinear interpolation, rather than the default FilterQuality.none which corresponds to nearest-neighbor.

If excludeFromSemantics is true, then semanticLabel will be ignored.

Implementation

Image.memory(
  Uint8List bytes, {
  Key key,
  double scale = 1.0,
  this.frameBuilder,
  this.semanticLabel,
  this.excludeFromSemantics = false,
  this.width,
  this.height,
  this.color,
  this.colorBlendMode,
  this.fit,
  this.alignment = Alignment.center,
  this.repeat = ImageRepeat.noRepeat,
  this.centerSlice,
  this.matchTextDirection = false,
  this.gaplessPlayback = false,
  this.filterQuality = FilterQuality.low,
}) : image = MemoryImage(bytes, scale: scale),
     loadingBuilder = null,
     assert(alignment != null),
     assert(repeat != null),
     assert(matchTextDirection != null),
     super(key: key);