A widget that makes its child partially transparent.
This class paints its child into an intermediate buffer and then blends the child back into the scene partially transparent.
For values of opacity other than 0.0 and 1.0, this class is relatively expensive because it requires painting the child into an intermediate buffer. For the value 0.0, the child is simply not painted at all. For the value 1.0, the child is painted immediately without an intermediate buffer.
- Inheritance
Constructors
Properties
- opacity → double
-
The fraction to scale the child's alpha value.
read-only - child → Widget
-
The widget below this widget in the tree.
read-only, inherited - hashCode → int
-
Get a hash code for this object.
read-only, inherited - key → Key
-
Controls how one widget replaces another widget in the tree.
read-only, inherited - runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Operators
-
operator ==(
other) → bool -
The equality operator.
inherited
Methods
-
createRenderObject(
BuildContext context) → RenderOpacity -
Creates an instance of the
RenderObject
class that thisRenderObjectWidget
represents, using the configuration described by thisRenderObjectWidget
. -
debugFillDescription(
List<String> description) → void -
Add additional information to the given description for use by
toString
. -
updateRenderObject(
BuildContext context, RenderOpacity renderObject) → void -
Copies the configuration described by this
RenderObjectWidget
to the givenRenderObject
, which will be of the same type as returned by this object'screateRenderObject
. -
createElement(
) → SingleChildRenderObjectElement -
RenderObjectWidgets always inflate to a
RenderObjectElement
subclass.inherited -
didUnmountRenderObject(
RenderObject renderObject) → void -
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited -
toString(
) → String -
Returns a string representation of this object.
inherited -
toStringShort(
) → String -
A short, textual description of this widget.
inherited