A material design floating action button.

A floating action button is a circular icon button that hovers over content to promote a primary action in the application. Floating action buttons are most commonly used in the Scaffold.floatingActionButton field.

Use at most a single floating action button per screen. Floating action buttons should be used for positive actions such as "create", "share", or "navigate".

If the onPressed callback is null, then the button will be disabled and will not react to touch.

See also:

Inheritance

Constructors

FloatingActionButton({Key key, @required Widget child, String tooltip, Color backgroundColor, Object heroTag, double elevation: 6.0, double highlightElevation: 12.0, @required VoidCallback onPressed, bool mini: false })
Creates a floating action button. [...]
const

Properties

backgroundColor Color
The color to use when filling the button. [...]
final
child Widget
The widget below this widget in the tree.
final
elevation double
The z-coordinate at which to place this button. This controls the size of the shadow below the floating action button. [...]
final
heroTag Object
The tag to apply to the button's Hero widget. [...]
final
highlightElevation double
The z-coordinate at which to place this button when the user is touching the button. This controls the size of the shadow below the floating action button. [...]
final
mini bool
Controls the size of this button. [...]
final
onPressed VoidCallback
The callback that is called when the button is tapped or otherwise activated. [...]
final
tooltip String
Text that describes the action that will occur when the button is pressed. [...]
final
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

createState() → _FloatingActionButtonState
Creates the mutable state for this widget at a given location in the tree. [...]
createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder description) → 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() String
Returns a string representation of this object.
inherited
toStringDeep([String prefixLineOne = '', String prefixOtherLines ]) String
Returns a string representation of this node and its descendants. [...]
inherited
toStringShallow([String joiner = ', ' ]) String
Returns a one-line detailed description of the object. [...]
inherited
toStringShort() String
A short, textual description of this widget.
inherited

Operators

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