StatsExtension class

Reactive graph statistics extension.

Provides a facade over the controller's observable properties, making it convenient to access graph statistics in one place. All properties are reactive through the controller's underlying MobX observables.

This extension uses void as its config type since it doesn't require any configuration.

Usage with Granular Observers

// Each stat can have its own Observer for fine-grained updates
Row(
  children: [
    Observer(builder: (_) => Text('${controller.stats.nodeCount} nodes')),
    Observer(builder: (_) => Text('${controller.stats.zoomPercent}%')),
  ],
)

Summary Helpers

Observer(builder: (_) => Text(controller.stats.summary));
// Output: "25 nodes, 40 connections"

Inheritance

Object
NodeFlowExtension<void>
StatsExtension

Constructors

StatsExtension(): Creates a stats extension.

Properties

avgConnectionsPerNode → double: Average number of connections per node. Reactive.
no setter
bounds → Rect: Bounding rectangle containing all nodes. Reactive.
no setter
boundsArea → double: Total area of the graph bounds. Reactive.
no setter
boundsCenter → Offset: Center point of the graph. Reactive.
no setter
boundsHeight → double: Height of the graph bounds. Reactive.
no setter
boundsSummary → String: Bounds summary: "2400 × 1800 px"
no setter
boundsWidth → double: Width of the graph bounds. Reactive.
no setter
commentCount → int: Number of CommentNode instances. Reactive.
no setter
config → Null: The configuration for this extension.
no setteroverride
connectionCount → int: Total number of connections. Reactive.
no setter
connections → ObservableList<Connection>: The connections observable list for direct reactive access.
no setter
density → double: Node density (nodes per 1,000,000 square units). Reactive.
no setter
groupCount → int: Number of GroupNode instances. Reactive.
no setter
hashCode → int: The hash code for this object.
no setterinherited
hasSelection → bool: Whether any item is selected. Reactive.
no setter
id → String: Unique identifier for this extension.
no setteroverride
isLargeGraph → bool: Whether this is considered a "large" graph (> 100 nodes). Reactive.
no setter
isMultiSelection → bool: Whether multiple items are selected. Reactive.
no setter
labeledConnectionCount → int: Number of connections that have labels. Reactive.
no setter
lockedNodeCount → int: Number of locked nodes. Reactive.
no setter
lodLevel → String: Current LOD level name: 'minimal', 'standard', or 'full'.
no setter
nodeCount → int: Total number of nodes in the graph. Reactive.
no setter
nodes → ObservableMap<String, Node>: The nodes observable map for direct reactive access.
no setter
nodesByType → Map<String, int>: Breakdown of nodes by their type property. Reactive. Example: {'process': 5, 'decision': 3, 'start': 1}
no setter
nodesInViewport → int: Number of nodes currently visible in the viewport. Reactive.
no setter
pan → Offset: Current pan offset in graph coordinates. Reactive via viewport observable.
no setter
regularNodeCount → int: Number of regular nodes (excluding groups and comments). Reactive.
no setter
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
selectedConnectionCount → int: Number of selected connections. Reactive.
no setter
selectedConnectionIds → ObservableSet<String>: The selected connection IDs observable set for direct reactive access.
no setter
selectedCount → int: Total selected items (nodes + connections). Reactive.
no setter
selectedNodeCount → int: Number of selected nodes. Reactive.
no setter
selectedNodeIds → ObservableSet<String>: The selected node IDs observable set for direct reactive access.
no setter
selectionSummary → String: Selection summary: "3 nodes, 2 connections selected" or "Nothing selected"
no setter
summary → String: Quick graph summary: "25 nodes, 40 connections"
no setter
viewport → Observable<GraphViewport>: The viewport observable for direct reactive access.
no setter
viewportSummary → String: Viewport summary: "100% at (0, 0)"
no setter
visibleNodeCount → int: Number of visible (non-hidden) nodes. Reactive.
no setter
zoom → double: Current zoom level (e.g., 1.0, 0.5, 2.0). Reactive via viewport observable.
no setter
zoomPercent → int: Zoom as integer percentage (e.g., 100, 50, 200). Reactive via viewport observable.
no setter

Methods

attach(NodeFlowController controller) → void: Called when the extension is attached to a controller.
override
detach() → void: Called when the extension is detached from the controller.
override
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
onEvent(GraphEvent event) → void: Called when a graph event occurs.
override
toString() → String: A string representation of this object.
inherited

Operators

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