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.
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 ByteData.view(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(
MaterialApp(
home: DefaultAssetBundle(
bundle: TestAssetBundle(),
child: 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:
- AssetBundle, the interface for asset bundles.
- rootBundle, the default default asset bundle.
- Inheritance
- Object
- Diagnosticable
- DiagnosticableTree
- Widget
- ProxyWidget
- InheritedWidget
- DefaultAssetBundle
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(
covariant DefaultAssetBundle oldWidget) → bool -
Whether the framework should notify widgets that inherit from this widget. [...]
override
-
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. [...]