DefaultAssetBundle class

A widget that determines the default asset bundle for its descendants.

For example, used by Image to determine which bundle to use for AssetImages if no bundle is specified explicitly.

Sample code

This can be used in tests to override what the current asset bundle is, thus allowing specific resources to be injected into the widget under test.

For example, a test could create a test asset bundle like this:

class TestAssetBundle extends CachingAssetBundle {
  @override
  Future<ByteData> load(String key) async {
    if (key == 'resources/test')
      return new ByteData.view(new Uint8List.fromList(utf8.encode('Hello World!')).buffer);
    return null;
  }
}

...then wrap the widget under test with a DefaultAssetBundle using this bundle implementation:

await tester.pumpWidget(
  new MaterialApp(
    home: new DefaultAssetBundle(
      bundle: new TestAssetBundle(),
      child: new TestWidget(),
    ),
  ),
);

Assuming that TestWidget uses DefaultAssetBundle.of to obtain its AssetBundle, it will now see the TestAssetBundle's "Hello World!" data when requesting the "resources/test" asset.

See also:

Inheritance

Constructors

DefaultAssetBundle({Key key, @required AssetBundle bundle, @required Widget child })
Creates a widget that determines the default asset bundle for its descendants. [...]
const

Properties

bundle AssetBundle
The bundle to use as a default.
final
child Widget
The widget below this widget in the tree. [...]
final, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

updateShouldNotify(DefaultAssetBundle oldWidget) bool
Whether the framework should notify widgets that inherit from this widget. [...]
createElement() InheritedElement
Inflates this configuration to a concrete instance. [...]
inherited
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toDiagnosticsNode({String name, DiagnosticsTreeStyle style }) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this object.
inherited
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this node and its descendants. [...]
inherited
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a one-line detailed description of the object. [...]
inherited
toStringShort() String
A short, textual description of this widget.
inherited

Operators

operator ==(dynamic other) bool
The equality operator. [...]
inherited

Static Methods

of(BuildContext context) AssetBundle
The bundle from the closest instance of this class that encloses the given context. [...]