GraphTreeLayoutStrategy class base

A layout strategy that arranges nodes in a hierarchical tree structure.

Key features:

Example:

// Arrange nodes top-to-bottom with root at the top
final layout = GraphTreeLayoutStrategy(
  direction: GraphTreeLayoutDirection.topToBottom,
  rootNodeId: rootNode.id,
  siblingNodeComparator: (a, b) {
    // Order siblings by their labels
    return a['label'].compareTo(b['label']);
  },
);

return GraphView(
  graph: graph,
  layoutStrategy: layout,
);
Inheritance

Constructors

GraphTreeLayoutStrategy.new({required GraphTreeLayoutDirection direction, int? seed, EdgeInsets padding = const EdgeInsets.all(100), List<GraphNodeLayoutPosition> nodePositions = const [], GraphId? rootNodeId, GraphTreeLayoutRootNodeSelector? rootNodeSelector, GraphTreeLayoutSiblingNodeComparator? siblingNodeComparator})
Creates a tree layout strategy with required direction and optional configuration.

Properties

direction → GraphTreeLayoutDirection
ツリーの展開方向
final
hashCode → int
The hash code for this object.
no setterinherited
isHorizontal → bool
Whether the layout expands horizontally (left-to-right or right-to-left).
no setter
nodePositions → List<GraphNodeLayoutPosition>
List of predefined node positions.
finalinherited
padding → EdgeInsets
Padding around the layout area.
finalinherited
random → Random
Random number generator initialized with seed.
finalinherited
rootNodeId → GraphId?
ルートノードのID
final
rootNodeSelector → GraphTreeLayoutRootNodeSelector?
Callback for selecting the root node.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
seed → int?
Optional seed for reproducible random number generation.
finalinherited
siblingNodeComparator → GraphTreeLayoutSiblingNodeComparator?
Callback for determining the order of sibling nodes at each level.
final

Methods

baseEquals(covariant GraphLayoutStrategy oldStrategy) → bool
Compares basic layout properties for equality.
inherited
getNodePosition(GraphNode node) → GraphNodeLayoutPosition?
Gets the predefined position for a node, if any exists.
inherited
getNodeSize(GraphNode node) → Size?
Retrieves the current size of a node.
inherited
isNodeFixed(GraphNode node) → bool
Checks if a node's position should remain fixed during layout.
inherited
isSameStrategy(GraphLayoutStrategy other) → bool
Checks if the given strategy is of the same type as this one.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
performLayout(Graph graph, Size size) → void
Calculates and applies node positions based on the layout algorithm.
override
positionNode(GraphNode node, Offset position) → void
Positions a node at the specified coordinates.
inherited
shouldRelayout(covariant GraphTreeLayoutStrategy oldStrategy) → bool
Determines if the layout needs to be recalculated.
override
toString() → String
A string representation of this object.
inherited

Operators

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