KeyboardAttachable class
A widget that adds space below its baseline when the soft keyboard is shown and hidden with an animation that matches that of the platform keyboard.
This widget can be used to animate its child when the soft keyboard is shown or hidden, so that the child widget appears to be attached to the keyboard.
Even if no child widget is passed to KeyboardAttachable, it can still be used to animate the shrinkage and expansion of the layout when the keyboard is shown an hidden, respectively. In order for this to work, this widget has to be attached to the bottom of the page, for example, by using a FooterLayout, and the Scaffold.resizeToAvoidBottomInset parameter of the Scaffold above the page has to be set to false.
In addition to that, when there are SafeAreas involved the layout, it is recommended to set their SafeArea.maintainBottomViewPadding property to true in order for the animations to run smoothly.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- KeyboardAttachable
Constructors
- KeyboardAttachable({Widget? child, KeyboardTransitionBuilder transitionBuilder = KeyboardAttachable._defaultBuilder, Color backgroundColor = Colors.transparent, Key? key})
-
Creates a widget that smoothly adds space below its child when the
keyboard is shown or hidden.
const
Properties
- backgroundColor → Color
-
The color that fills the space that is added when the keyboard appears.
final
- child → Widget?
-
The widget to be placed above the space that this widget can insert.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- transitionBuilder → KeyboardTransitionBuilder
-
A function that wraps a new child with an animation that makes the
keyboard appear when the animation runs in the forward direction and hide
when the animation runs in the reverse direction.
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → _KeyboardAttachableState -
Creates the mutable state for this widget at a given location in the tree.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNode
objects describing this node's children.inherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent 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 DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited