AnimatedTreeView<T extends Object> class
A TreeView that animates the expansion state changes of tree nodes.
Usage:
@override
Widget build(BuildContext context) {
return AnimatedTreeView<Node>(
treeController: treeController,
duration: const Duration(milliseconds: 300),
curve: Curves.linear,
maxNodesToShowWhenAnimating: 50,
transitionBuilder: (BuildContext context, Widget child, Animation<double> animation) {
return FadeTransition(
opacity: animation,
child: SizeTransition(
sizeFactor: animation,
child: child,
),
);
},
nodeBuilder: (BuildContext context, TreeEntry<Node> entry) {
...
},
);
}
See also:
- SliverAnimatedTree, which is created internally by AnimatedTreeView. It can be used to create more sophisticated scrolling experiences.
- TreeView, a version of this widget that has no custom behaviors.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- ScrollView
- BoxScrollView
- TreeView<
T> - AnimatedTreeView
Constructors
-
AnimatedTreeView({Key? key, required TreeController<
T> treeController, required TreeNodeBuilder<T> nodeBuilder, TreeTransitionBuilder transitionBuilder = defaultTreeTransitionBuilder, Duration duration = const Duration(milliseconds: 300), Curve curve = Curves.linear, int maxNodesToShowWhenAnimating = 50, EdgeInsetsGeometry? padding, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool shrinkWrap = false, double? cacheExtent, int? semanticChildCount, DragStartBehavior dragStartBehavior = DragStartBehavior.start, ScrollViewKeyboardDismissBehavior keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual, String? restorationId, Clip clipBehavior = Clip.hardEdge}) -
Creates a TreeView.
const
Properties
- anchor → double
-
The relative position of the zero scroll offset.
finalinherited
- cacheExtent → double?
-
The viewport has an area before and after the visible area to cache items
that are about to become visible when the user scrolls.
finalinherited
- center → Key?
-
The first child in the GrowthDirection.forward growth direction.
finalinherited
- clipBehavior → Clip
-
The content will be clipped (or not) according to this option.
finalinherited
- controller → ScrollController?
-
An object that can be used to control the position to which this scroll
view is scrolled.
finalinherited
- curve → Curve
-
The default curve to use when animating the expand/collapse operations.
final
- dragStartBehavior → DragStartBehavior
-
Determines the way that drag start behavior is handled.
finalinherited
- duration → Duration
-
The default duration to use when animating the expand/collapse operations.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- keyboardDismissBehavior → ScrollViewKeyboardDismissBehavior
-
ScrollViewKeyboardDismissBehavior the defines how this ScrollView will
dismiss the keyboard automatically.
finalinherited
- maxNodesToShowWhenAnimating → int
-
The amount of nodes that are going to be shown on an animating subtree.
final
-
nodeBuilder
→ TreeNodeBuilder<
T> -
Callback used to map tree nodes into widgets.
finalinherited
- padding → EdgeInsetsGeometry?
-
The amount of space by which to inset the children.
finalinherited
- physics → ScrollPhysics?
-
How the scroll view should respond to user input.
finalinherited
- primary → bool?
-
Whether this is the primary scroll view associated with the parent
PrimaryScrollController.
finalinherited
- restorationId → String?
-
Restoration ID to save and restore the scroll offset of the scrollable.
finalinherited
- reverse → bool
-
Whether the scroll view scrolls in the reading direction.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- scrollBehavior → ScrollBehavior?
-
A ScrollBehavior that will be applied to this widget individually.
finalinherited
- scrollDirection → Axis
-
The Axis along which the scroll view's offset increases.
finalinherited
- semanticChildCount → int?
-
The number of children that will contribute semantic information.
finalinherited
- shrinkWrap → bool
-
Whether the extent of the scroll view in the scrollDirection should be
determined by the contents being viewed.
finalinherited
- transitionBuilder → TreeTransitionBuilder
-
A widget builder used to apply a transition to the expansion state changes
of a node subtree when animations are enabled.
final
-
treeController
→ TreeController<
T> -
The object responsible for providing access to tree nodes and their states.
finalinherited
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
inherited
-
buildChildLayout(
BuildContext context) → Widget -
Subclasses should override this method to build the layout model.
override
-
buildSlivers(
BuildContext context) → List< Widget> -
Build the list of widgets to place inside the viewport.
inherited
-
buildViewport(
BuildContext context, ViewportOffset offset, AxisDirection axisDirection, List< Widget> slivers) → Widget -
Build the viewport.
inherited
-
createElement(
) → StatelessElement -
Creates a StatelessElement to manage this widget's location in the tree.
inherited
-
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
-
getDirection(
BuildContext context) → AxisDirection -
Returns the AxisDirection in which the scroll view scrolls.
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