GraphComponent class

Boot of graph.

图构建器

Inheritance

• Object
• Component
• GraphComponent

Mixed-in types

• HasCollisionDetection<Broadphase<ShapeHitbox>>

Available extensions

• ParallaxComponentExtension

Constructors

GraphComponent({required dynamic data, required GraphAlgorithm algorithm, required BuildContext context, required DataConvertor convertor, Options? options})

Properties

algorithm ↔ GraphAlgorithm

getter/setter pair

assets ↔ AssetsCache

The cache of all (non-image) assets loaded into the game. This defaults to the global Flame.assets cache, but you can replace this with another instance if needed.

getter/setter pair, inherited

buildContext → BuildContext?

Currently attached build context. Can be null if not attached.

no setter, inherited

camera ↔ CameraComponent

The component that is responsible for rendering your world.

getter/setter pair, inherited

canvasSize → Vector2

no setter, inherited

children → ComponentSet

The children components of this component.

no setter, inherited

collisionDetection ↔ CollisionDetection<ShapeHitbox, Broadphase<ShapeHitbox>>

getter/setter pair, inherited

context ↔ BuildContext

getter/setter pair

convertor ↔ DataConvertor

getter/setter pair

data ↔ dynamic

getter/setter pair

debugColor ↔ Color

The color that the debug output should be rendered with.

getter/setter pair, inherited

debugCoordinatesPrecision ↔ int?

How many decimal digits to print when displaying coordinates in the debug mode. Setting this to null will suppress all coordinates from the output.

getter/setter pair, inherited

debugMode ↔ bool

Returns whether this Component is in debug mode or not. When a child is added to the Component it gets the same debugMode as its parent has when it is prepared.

getter/setter pair, inherited

debugPaint → Paint

The debugColor represented as a Paint object.

no setter, inherited

debugTextPaint → TextPaint

Returns a TextPaint object with the debugColor set as color for the text.

no setter, inherited

gameStateListeners → List<VoidCallback>

final, inherited

gestureDetectors → GestureDetectorBuilder

Used internally by various mixins that need to use gesture detection functionality in Flutter.

late, final, inherited

graph ↔ Graph

getter/setter pair

hasChildren → bool

no setter, inherited

hashCode → int

The hash code for this object.

no setter, inherited

hasLayout → bool

Indicates if this game instance is connected to a GameWidget that is live in the flutter widget tree. Once this is true, the game is ready to have its size used or in the case of a FlameGame, to receive components.

no setter, inherited

hasLifecycleEvents → bool

no setter, inherited

images ↔ Images

The cache of all images loaded into the game. This defaults to the global Flame.images cache, but you can replace it with a new cache instance if needed.

getter/setter pair, inherited

isAttached → bool

Whether the game widget was attached to the Flutter tree.

no setter, inherited

isHovered → bool

Returns true while the component is being dragged.

no setter, inherited

isLoaded → bool

Whether this component has completed its onLoad step.

no setter, inherited

isLoading → bool

Whether the component is currently executing its onLoad step.

no setter, inherited

isMounted → bool

Whether this component is currently added to a component tree.

no setter, inherited

isMounting → bool

no setter, inherited

isRemoved → bool

Whether the component has been removed. Originally this flag is false, but it becomes true after the component was mounted and then removed from its parent. The flag becomes false again when the component is mounted to a new parent.

no setter, inherited

isRemoving → bool

Whether the component is scheduled to be removed.

no setter, inherited

key → ComponentKey?

A key that can be used to identify this component in the tree.

final, inherited

legendCount ↔ int

getter/setter pair

lifecycleEventsProcessed → Future<void>

A future that will complete once all lifecycle events have been processed.

no setter, inherited

loaded → Future<void>

A future that completes when this component finishes loading.

no setter, inherited

mounted → Future<void>

A future that will complete once the component is mounted on its parent.

no setter, inherited

mouseCursor ↔ MouseCursor

Used to change the mouse cursor of the GameWidget running this game. Setting the value to null will make the GameWidget defer the choice of the cursor to the closest region available on the tree.

getter/setter pair, inherited

mouseDetector ↔ void Function(PointerHoverEvent event)?

Set by the PointerMoveDispatcher to receive mouse events from the game widget.

getter/setter pair, inherited

notifiers → List<ComponentsNotifier<Component>>

late, final, inherited

options ↔ Options

getter/setter pair

overlays → OverlayManager

A property that stores an OverlayManager

late, final, inherited

parent ↔ Component?

Who owns this component in the component tree.

getter/setter pair, inherited

paused ↔ bool

Returns is the engine if currently paused or running

getter/setter pair, inherited

pauseWhenBackgrounded ↔ bool

Whether the game should pause when the app is backgrounded.

getter/setter pair, inherited

priority ↔ int

Render priority of this component. This allows you to control the order in which your components are rendered.

getter/setter pair, inherited

removed → Future<void>

A future that completes when this component is removed from its parent.

no setter, inherited

renderBox → GameRenderBox

Just a reference back to the render box that is kept up to date by the engine.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

scale ↔ ValueNotifier<double>

getter/setter pair

size → Vector2

This is overwritten to consider the viewport transformation.

no setter, inherited

world ↔ World

The World that the camera is rendering. Inside of this world is where most of your components should be added.

getter/setter pair, inherited

Methods

add(Component component) → FutureOr<void>

Schedules component to be added as a child to this component.

inherited

addAll(Iterable<Component> components) → Future<void>

A convenience method to add multiple children at once.

inherited

addEdge(dynamic edata) → dynamic

Add an edge to the graph.

addGameStateListener(VoidCallback callback) → void

inherited

addToParent(Component parent) → FutureOr<void>

Adds this component as a child of parent (see add for details).

inherited

addVertex(dynamic vdata) → dynamic

Add a vertex to the graph.

ancestors({bool includeSelf = false}) → Iterable<Component>

An iterator producing this component's parent, then its parent's parent, then the great-grand-parent, and so on, until it reaches a component without a parent.

inherited

assertHasLayout() → void

inherited

attach(PipelineOwner owner, GameRenderBox gameRenderBox) → void

Marks game as attached to any Flutter widget tree.

inherited

backgroundColor() → Color

Returns the game background color. By default it will return a black color. It cannot be changed at runtime, because the game widget does not get rebuild when this value changes.

inherited

clampZoom() → void

clearPosition() → dynamic

Clear all vertexes' position value.

componentsAtLocation<T>(T locationContext, List<T>? nestedContexts, T? transformContext(CoordinateTransform, T), bool checkContains(Component, T)) → Iterable<Component>

This is a generic implementation of componentsAtPoint; refer to those docs for context.

inherited

componentsAtPoint(Vector2 point, [List<Vector2>? nestedPoints]) → Iterable<Component>

An iterable of descendant components intersecting the given point. The point is in the local coordinate space.

inherited

componentsNotifier<T extends Component>() → ComponentsNotifier<T>

Returns a ComponentsNotifier for the given type W.

inherited

contains(Component c) → bool

Whether the children list contains the given component.

inherited

containsLocalPoint(Vector2 point) → bool

Whether a point is within the boundaries of the visible part of the game.

inherited

containsPoint(Vector2 point) → bool

Same as containsLocalPoint, but for a "global" point.

inherited

convertGlobalToLocalCoordinate(Vector2 point) → Vector2

Converts a global coordinate (i.e. w.r.t. the app itself) to a local coordinate (i.e. w.r.t. he game widget). If the widget occupies the whole app ("full screen" games), or is not attached to Flutter, this operation is the identity.

inherited

convertLocalToGlobalCoordinate(Vector2 point) → Vector2

Converts a local coordinate (i.e. w.r.t. the game widget) to a global coordinate (i.e. w.r.t. the app itself). If the widget occupies the whole app ("full screen" games), or is not attached to Flutter, this operation is the identity.

inherited

createComponentSet() → ComponentSet

This method creates the children container for the current component. Override this method if you need to have a custom ComponentSet within a particular class.

inherited

createLegend() → void

currentTime() → double

Returns the current time in seconds with microseconds precision.

inherited

dequeueAdd(Component child, Component parent) → void

inherited

dequeueRemove(Component child) → void

inherited

descendants({bool includeSelf = false, bool reversed = false}) → Iterable<Component>

Recursively enumerates all nested children.

inherited

detach() → void

Marks game as no longer attached to any Flutter widget tree.

inherited

enqueueAdd(Component child, Component parent) → void

inherited

enqueueMove(Component child, Component newParent) → void

inherited

enqueueRebalance(Component parent) → void

inherited

enqueueRemove(Component child, Component parent) → void

inherited

finalizeRemoval() → void

inherited

findByKey<T extends Component>(ComponentKey key) → T?

inherited

findByKeyName<T extends Component>(String name) → T?

inherited

findGame() → FlameGame<World>?

Fetches the nearest FlameGame ancestor to the component.

inherited

findParent<T extends Component>({bool includeSelf = false}) → T?

Returns the closest parent further up the hierarchy that satisfies type=T, or null if no such parent can be found.

inherited

findRootGame() → FlameGame<World>?

Fetches the root FlameGame ancestor to the component.

inherited

firstChild<T extends Component>() → T?

Returns the first child that matches the given type T, or null if there are no such children.

inherited

handleLifecycleEventAdd(Component parent) → LifecycleEventStatus

inherited

handleLifecycleEventMove(Component newParent) → LifecycleEventStatus

inherited

handleLifecycleEventRemove(Component parent) → LifecycleEventStatus

inherited

handleResize(Vector2 size) → void

inherited

handleScaleEnd(ScaleEndDetails details) → void

inherited

handleScaleStart(ScaleStartDetails details) → void

inherited

handleScaleUpdate(ScaleUpdateDetails details) → void

inherited

keepMousePosition(PointerScrollInfo? info, Vector2 opg, double zoomDelta, Viewfinder vf, double oz, [Vector2? wp]) → void

lastChild<T extends Component>() → T?

Returns the last child that matches the given type T, or null if there are no such children.

inherited

lifecycleStateChange(AppLifecycleState state) → void

This is the lifecycle state change hook; every time the game is resumed, paused or suspended, this is called.

inherited

load() → FutureOr<void>

inherited

loadSprite(String path, {Vector2? srcSize, Vector2? srcPosition}) → Future<Sprite>

Utility method to load and cache the image for a sprite based on its options.

inherited

loadSpriteAnimation(String path, SpriteAnimationData data) → Future<SpriteAnimation>

Utility method to load and cache the image for a sprite animation based on its options.

inherited

mergeGraph(dynamic graphData) → void

Merge the graph data.

mount() → void

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

onAttach() → void

Called when the game has been attached. This can be overridden to add logic that requires the game to already be attached to the widget tree.

inherited

onChildrenChanged(Component child, ChildrenChangeType type) → void

This method will be invoked from lifecycle if child has been added to or removed from its parent children list.

inherited

onDetach() → void

Called after the game has left the widget tree. This can be overridden to add logic that requires the game not be on the flutter widget tree anymore.

inherited

onDispose() → void

Called when the GameWidget is disposed by Flutter.

inherited

onGameResize(Vector2 size) → void

This passes the new size along to every component in the tree via their Component.onGameResize method, enabling each one to make their decision of how to handle the resize event.

inherited

onHoverEnter() → void

inherited

onHoverExit() → void

inherited

onLoad() → Future<void>

Late initialization method for Component.

override

onMount() → void

Called when the component is added to its parent.

inherited

onPanUpdate(Vector2 globalDelta) → void

Global delta can be got from ScaleDetector.

onParentResize(Vector2 maxSize) → void

Called whenever the parent of this component changes size; and also once before onMount.

inherited

onPointerMove(PointerMoveEvent event) → void

inherited

onPointerMoveStop(PointerMoveEvent event) → void

inherited

onRemove() → void

Called when the game is about to be removed from the Flutter widget tree, but before it is actually removed. See the docs for an example on how to do cleanups to avoid memory leaks.

inherited

onScaleEnd(ScaleEndInfo info) → void

inherited

onScaleStart(ScaleStartInfo info) → void

inherited

onScaleUpdate(ScaleUpdateInfo info) → void

onScroll(PointerScrollInfo info) → void

onZoom({required Vector2 zoomCenter, double zoomDelta = 0}) → void

pauseEngine() → void

Pauses the engine game loop execution.

inherited

processLifecycleEvents() → void

inherited

processRebalanceEvents() → void

inherited

propagateToApplicableNotifiers(Component component, void callback(ComponentsNotifier<Component>)) → void

inherited

propagateToChildren<T extends Component>(bool handler(T), {bool includeSelf = false}) → bool

This method first calls the passed handler on the leaves in the tree, the children without any children of their own. Then it continues through all other children. The propagation continues until the handler returns false, which means "do not continue", or when the handler has been called with all children.

inherited

ready() → Future<void>

Ensure that all pending tree operations finish.

inherited

refreshData(dynamic data) → void

refreshWidget({bool isInternalRefresh = true}) → void

When a Game is attached to a GameWidget, this method will force that widget to be rebuilt. This can be used when updating any property which is implemented within the Flutter tree.

inherited

registerKey(ComponentKey key, Component component) → void

inherited

remove(Component component) → void

Removes a component from the component tree.

inherited

removeAll(Iterable<Component> components) → void

Removes all the children in the list and calls onRemove for all of them and their children.

inherited

removeFromParent() → void

Remove the component from its parent in the next tick.

inherited

removeGameStateListener(VoidCallback callback) → void

inherited

removeWhere(bool test(Component component)) → void

Removes all the children for which the test function returns true.

inherited

render(Canvas canvas) → void

This implementation of render renders each component, making sure the canvas is reset for each one.

inherited

renderDebugMode(Canvas canvas) → void

inherited

renderTree(Canvas canvas) → void

inherited

resumeEngine() → void

Resumes the engine game loop execution.

inherited

setDefaultVertexColor() → dynamic

setLoaded() → void

Used by the FlameGame to set the loaded state of the component, since the game isn't going through the whole normal component life cycle.

inherited

setMounted() → void

Used by the FlameGame to set the mounted state of the component, since the game isn't going through the whole normal component life cycle.

inherited

setRemoved() → void

Used by the FlameGame to set the removed state of the component, since the game isn't going through the whole normal component life cycle.

inherited

stepEngine({double stepTime = 1 / 60}) → void

Steps the engine game loop by one frame. Works only if the engine is in paused state. By default step time is assumed to be 1/60th of a second.

inherited

toBeLoaded() → FutureOr<void>

To be used for tests that needs to evaluate the game after it has been loaded by the game widget.

inherited

toString() → String

A string representation of this object.

inherited

unregisterKey(ComponentKey key) → void

inherited

update(double dt) → void

This method is called periodically by the game engine to request that your component updates itself.

inherited

updateTree(double dt) → void

This method traverses the component tree and calls update on all its children according to their priority order, relative to the priority of the direct siblings, not the children or the ancestors.

inherited

updateViewport(dynamic x, dynamic y) → dynamic

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

zoomPerScrollUnit → const double