A convenience widget that combines common painting, positioning, and sizing widgets.
A container first surrounds the child with padding (inflated by any
borders present in the decoration) and then applies additional
constraints to the padded extent (incorporating the width and height
as constraints, if either is non-null). The container is then surrounded by
additional empty space described from the margin.
During painting, the container first applies the given transform, then paints the decoration to fill the padded extent, then it paints the child, and finally paints the foregroundDecoration, also filling the padded extent.
Containers with no children try to be as big as possible unless the incoming
constraints are unbounded, in which case they try to be as small as
possible. Containers with children size themselves to their children. The
width, height, and constraints arguments to the constructor override
this.
- Inheritance
- Object
- Widget
- StatelessWidget
- Container
Constructors
- Container({Key key, FractionalOffset alignment, EdgeInsets padding, Decoration decoration, Decoration foregroundDecoration, double width, double height, BoxConstraints constraints, EdgeInsets margin, Matrix4 transform, Widget child })
-
Creates a widget that combines common painting, positioning, and sizing widgets.
Properties
- alignment → FractionalOffset
-
Align the child within the container.
read-only - child → Widget
-
The child contained by the container.
read-only - constraints → BoxConstraints
-
Additional constraints to apply to the child.
read-only - decoration → Decoration
-
The decoration to paint behind the child.
read-only - foregroundDecoration → Decoration
-
The decoration to paint in front of the child.
read-only - margin → EdgeInsets
-
Empty space to surround the decoration and child.
read-only - padding → EdgeInsets
-
Empty space to inscribe inside the decoration. The child, if any, is placed inside this padding.
read-only - transform → Matrix4
-
The transformation matrix to apply before painting the container.
read-only - 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
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
-
debugFillDescription(
List<String> description) → void -
Add additional information to the given description for use by
toString. -
createElement(
) → StatelessElement -
Creates a StatelessElement to manage this widget's location in the tree.
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