StandardFabLocation class abstract

A base class that simplifies building FloatingActionButtonLocations when used with mixins FabTopOffsetY, FabFloatOffsetY, FabDockedOffsetY, FabStartOffsetX, FabCenterOffsetX, FabEndOffsetX, and FabMiniOffsetAdjustment.

A subclass of FloatingActionButtonLocation which implements its getOffset method using three other methods: getOffsetX, getOffsetY, and isMini.

Different mixins on this class override different methods, so that combining a set of mixins creates a floating action button location.

For example: the location FloatingActionButtonLocation.miniEndTop is based on a class that extends StandardFabLocation with mixins FabMiniOffsetAdjustment, FabEndOffsetX, and FabTopOffsetY.

You can create your own subclass of StandardFabLocation to implement a custom FloatingActionButtonLocation.

This is an example of a user-defined FloatingActionButtonLocation.

The example shows a Scaffold with an AppBar, a BottomAppBar, and a FloatingActionButton using a custom FloatingActionButtonLocation.

The new FloatingActionButtonLocation is defined by extending StandardFabLocation with two mixins, FabEndOffsetX and FabFloatOffsetY, and overriding the getOffsetX method to adjust the FAB's x-coordinate, creating a FloatingActionButtonLocation slightly different from FloatingActionButtonLocation.endFloat.


To create a local project with this code sample, run:
flutter create --sample=material.StandardFabLocation.1 mysample



Abstract const constructor. This constructor enables subclasses to provide const constructors so that they can be used in const expressions.


hashCode int
The hash code for this object.
runtimeType Type
A representation of the runtime type of the object.


getOffset(ScaffoldPrelayoutGeometry scaffoldGeometry) Offset
Places the FloatingActionButton based on the Scaffold's layout.
getOffsetX(ScaffoldPrelayoutGeometry scaffoldGeometry, double adjustment) double
Obtains the x-offset to place the FloatingActionButton based on the Scaffold's layout.
getOffsetY(ScaffoldPrelayoutGeometry scaffoldGeometry, double adjustment) double
Obtains the y-offset to place the FloatingActionButton based on the Scaffold's layout.
isMini() bool
A function returning whether this StandardFabLocation is optimized for mini FloatingActionButtons.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.