SelectionArea class
A widget that introduces an area for user selections with adaptive selection controls.
This widget creates a SelectableRegion with platform-adaptive selection controls.
Flutter widgets are not selectable by default. To enable selection for a specific screen, consider wrapping the body of the Route with a SelectionArea.
The SelectionArea widget must have a Localizations ancestor that contains a MaterialLocalizations delegate; using the MaterialApp widget ensures that such an ancestor is present.
This example shows how to make a screen selectable.
link
To create a local project with this code sample, run:
flutter create --sample=material.SelectionArea.1 mysample
See also:
- SelectableRegion, which provides an overview of the selection system.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- SelectionArea
Constructors
-
SelectionArea({Key? key, FocusNode? focusNode, TextSelectionControls? selectionControls, SelectableRegionContextMenuBuilder? contextMenuBuilder = _defaultContextMenuBuilder, TextMagnifierConfiguration? magnifierConfiguration, ValueChanged<
SelectedContent?> ? onSelectionChanged, required Widget child}) -
Creates a SelectionArea.
const
Properties
- child → Widget
-
The child widget this selection area applies to.
final
- contextMenuBuilder → SelectableRegionContextMenuBuilder?
-
Builds the text selection toolbar when requested by the user.
final
- focusNode → FocusNode?
-
An optional focus node to use as the focus node for this widget.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- magnifierConfiguration → TextMagnifierConfiguration?
-
A configuration object for a magnifier.
final
-
onSelectionChanged
→ ValueChanged<
SelectedContent?> ? -
Called when the selected content changes.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- selectionControls → TextSelectionControls?
-
The delegate to build the selection handles and toolbar.
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< StatefulWidget> -
Creates the mutable state for this widget at a given location in the tree.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNodeobjects 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