GraphViewBehavior class abstract interface

Coordinates the visual representation and interaction handling of a graph.

This interface serves as the central coordinator between:

• Visual representation through GraphNodeViewBehavior and GraphLinkViewBehavior
• Geometric calculations via GraphCircle and GraphRectangle models
• User interaction handling via dispatched GraphEvents.

The interface provides two key customization points:

• createNodeViewBehavior and createLinkViewBehavior for visual styling
• Event handlers like onTap, onSelectionChange for interaction logic

For most use cases, extend GraphViewDefaultBehavior and override specific methods rather than implementing this interface directly.

See also:

• GraphNodeViewBehavior, for node visualization control
• GraphLinkViewBehavior, for link visualization control
• GraphViewDefaultBehavior, for the standard implementation
• GraphEvent, for the base class of all interaction events

Implementers

• GraphViewDefaultBehavior

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

createLinkViewBehavior() → GraphLinkViewBehavior

Creates the behavior configuration for link rendering.

createNodeViewBehavior() → GraphNodeViewBehavior

Creates the behavior configuration for node rendering.

getConnectionPoints(GraphNode source, GraphNode target, Widget sourceWidget, Widget targetWidget) → GraphConnectionPoints?

Calculates connection points between two nodes.

hitTestLink(covariant GraphLink link, Offset position) → bool

Tests if a link contains the given position.

hitTestNode(covariant GraphNode node, Offset position) → bool

Tests if a node contains the given position.

isEquivalentTo(GraphViewBehavior other) → bool

Compares this behavior with another for content equality.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

onDoubleTap(GraphTapEvent event) → void

Called when entities are double-tapped.

onDragEnd(GraphDragEndEvent event) → void

Called when a drag operation on entities completes.

onDragStart(GraphDragStartEvent event) → void

Called when a drag operation starts on entities.

onDragUpdate(GraphDragUpdateEvent event) → void

Called during a drag operation on entities. Use event.delta for positional changes.

onHoverEnd(GraphHoverEndEvent event) → void

Called when the mouse pointer leaves an entity's area.

onHoverEnter(GraphHoverEvent event) → void

Called when the mouse pointer enters an entity's area.

onHoverMove(GraphHoverEvent event) → void

Called when the mouse pointer moves within an entity's area.

onSelectionChange(GraphSelectionChangeEvent event) → void

Called when the selection changes.

onTap(GraphTapEvent event) → void

Called when entities are tapped (single or double).

onTooltipHide(GraphTooltipHideEvent event) → void

Called when an entity's tooltip is hidden.

onTooltipShow(GraphTooltipShowEvent event) → void

Called when an entity's tooltip is shown.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited