WidgetOrderTraversalPolicy class
A FocusTraversalPolicy that traverses the focus order in widget hierarchy order.
This policy is used when the order desired is the order in which widgets are created in the widget hierarchy.
See also:
- FocusNode, for a description of the focus system.
- FocusTraversalGroup, a widget that groups together and imposes a traversal policy on the Focus nodes below it in the widget hierarchy.
- ReadingOrderTraversalPolicy, a policy that describes the order as the natural "reading order" for the current Directionality.
- DirectionalFocusTraversalPolicyMixin a mixin class that implements focus traversal in a direction.
- OrderedTraversalPolicy, a policy that describes the order explicitly using FocusTraversalOrder widgets.
- Inheritance
-
- Object
- FocusTraversalPolicy
- WidgetOrderTraversalPolicy
- Mixed in types
Constructors
- WidgetOrderTraversalPolicy({TraversalRequestFocusCallback? requestFocusCallback})
- Constructs a traversal policy that orders widgets for keyboard traversal based on the widget hierarchy order.
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- requestFocusCallback → TraversalRequestFocusCallback
-
The callback used to move the focus from one focus node to another when
traversing them using a keyboard. By default it requests focus on the next
node and ensures the node is visible if it's in a scrollable.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
changedScope(
{FocusNode? node, FocusScopeNode? oldScope}) → void -
This is called whenever the given
nodeis re-parented into a new scope, so that the policy has a chance to update or invalidate any cached data that it maintains per scope about the node.inherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
findFirstFocus(
FocusNode currentNode, {bool ignoreCurrentFocus = false}) → FocusNode? -
Returns the node that should receive focus if focus is traversing
forwards, and there is no current focus.
inherited
-
findFirstFocusInDirection(
FocusNode currentNode, TraversalDirection direction) → FocusNode? -
Returns the first node in the given
directionthat should receive focus if there is no current focus in the scope to which thecurrentNodebelongs.inherited -
findLastFocus(
FocusNode currentNode, {bool ignoreCurrentFocus = false}) → FocusNode -
Returns the node that should receive focus if focus is traversing
backwards, and there is no current focus.
inherited
-
inDirection(
FocusNode currentNode, TraversalDirection direction) → bool -
Focuses the next widget in the given
directionin the FocusScope that contains thecurrentNode.inherited -
invalidateScopeData(
FocusScopeNode node) → void -
Clears the data associated with the given FocusScopeNode for this object.
inherited
-
next(
FocusNode currentNode) → bool -
Focuses the next widget in the focus scope that contains the given
currentNode.inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
previous(
FocusNode currentNode) → bool -
Focuses the previous widget in the focus scope that contains the given
currentNode.inherited -
sortDescendants(
Iterable< FocusNode> descendants, FocusNode currentNode) → Iterable<FocusNode> -
Sorts the given
descendantsinto focus order.override -
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
-
toStringShort(
) → String -
A brief description of this object, usually just the runtimeType and the
hashCode.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited