ImageFilterModifier class
Applies an ImageFilter to its child.
An image filter will always apply its filter operation to the child widget,
even if said filter is conceptually a "no-op", such as an ImageFilter.blur
with a radius of 0 or an ImageFilter.matrix with an identity matrix. Setting
ImageFiltered.enabled to false is a more efficient manner of disabling
an image filter.
The framework does not attempt to optimize out "no-op" filters because it cannot tell the difference between an intentional no-op and a filter that is only incidentally a no-op. Consider an ImageFilter.matrix that is animated and happens to pass through the identity matrix. If the framework identified it as a no-op it would drop and then recreate the layer during the animation which would be more expensive than keeping it around.
See also:
- BackdropFilter, which applies an ImageFilter to everything beneath its child.
- ColorFiltered, which applies a ColorFilter to its child.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- SingleChildStatelessModifier
- ImageFilterModifier
- Available extensions
Constructors
- ImageFilterModifier({Key? key, Widget? child, required ImageFilter imageFilter, bool enabled = true})
-
Creates a widget that applies an ImageFilter to its child.
const
Properties
- enabled → bool
-
Whether or not to apply the image filter opation to the child of this
widget.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- imageFilter → ImageFilter
-
The image filter to apply to the child of this widget.
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- modifierKey → Key?
-
The actual key of the widget, which Modifier wrapped
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
inherited
-
buildWithChild(
BuildContext context, Widget? child) → Widget -
A build method that receives an extra
childparameter.override -
createElement(
) → SingleChildStatelessElement -
Create a SingleChildStatelessElement
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of DiagnosticsNode objects describing this node's
children.
inherited
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
modified(
) → Modifier -
Available on Widget, provided by the ModifierTransformer extension
Transform normal widget to Modifier -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent 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 DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → 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 ==(
Object other) → bool -
The equality operator.
inherited