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, Widget child, String tooltip, Color backgroundColor, Object heroTag, double elevation: 6.0, double highlightElevation: 12.0, 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.

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.

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
debugFillDescription(List<String> description) → void

Add additional information to the given description for use by toString.

@mustCallSuper, @protected, 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

Operators

operator ==(other) bool

The equality operator.

inherited