PaintingBinding mixin

Binding for the painting library.

Hooks into the cache eviction logic to clear the image cache.

Requires the ServicesBinding to be mixed in earlier.

Superclass Constraints
Implemented by

Constructors

PaintingBinding()

Properties

imageCache ImageCache
The singleton that implements the Flutter framework's image cache. [...]
read-only
systemFonts Listenable
Listenable that notifies when the available fonts on the system have changed. [...]
read-only
window Window
The window to which this binding is bound. [...]
read-only, inherited
locked bool
Whether lockEvents is currently locking events. [...]
@protected, read-only, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
defaultBinaryMessenger BinaryMessenger
The default instance of BinaryMessenger. [...]
read-only, inherited
schedulingStrategy SchedulingStrategy
The strategy to use when deciding whether to run a task or not. [...]
read / write, inherited
lifecycleState AppLifecycleState
Whether the application is visible, and if so, whether it is currently interactive. [...]
read-only, inherited
transientCallbackCount int
The current number of transient frame callbacks scheduled. [...]
read-only, inherited
endOfFrame Future<void>
Returns a Future that completes after the frame completes. [...]
read-only, inherited
hasScheduledFrame bool
Whether this scheduler has requested that handleBeginFrame be called soon.
read-only, inherited
schedulerPhase SchedulerPhase
The phase that the scheduler is currently operating under.
read-only, inherited
framesEnabled bool
Whether frames are currently being scheduled when scheduleFrame is called. [...]
read-only, inherited
currentFrameTimeStamp Duration
The time stamp for the frame currently being processed. [...]
read-only, inherited
currentSystemFrameTimeStamp Duration
The raw time stamp as provided by the engine to Window.onBeginFrame for the frame currently being processed. [...]
read-only, inherited

Methods

initInstances() → void
The initialization method. Subclasses override this method to hook into the platform and otherwise configure their services. Subclasses must call "super.initInstances()". [...]
override
createImageCache() ImageCache
Creates the ImageCache singleton (accessible via imageCache). [...]
@protected
instantiateImageCodec(Uint8List bytes, {int cacheWidth, int cacheHeight, bool allowUpscaling: false}) Future<Codec>
Calls through to dart:ui from ImageCache. [...]
evict(String asset) → void
Called in response to the ext.flutter.evict service extension. [...]
override
handleMemoryPressure() → void
Called when the operating system notifies the application of a memory pressure situation. [...]
override
handleSystemMessage(Object systemMessage) Future<void>
Handler called for messages received on the SystemChannels.system message channel. [...]
override
initServiceExtensions() → void
Called when the binding is initialized, to register service extensions. [...]
@mustCallSuper, @protected, inherited
lockEvents(Future<void> callback()) Future<void>
Locks the dispatching of asynchronous events and callbacks until the callback's future completes. [...]
@protected, inherited
unlocked() → void
Called by lockEvents when events get unlocked. [...]
@mustCallSuper, @protected, inherited
reassembleApplication() Future<void>
Cause the entire application to redraw, e.g. after a hot reload. [...]
inherited
performReassemble() Future<void>
This method is called by reassembleApplication to actually cause the application to reassemble, e.g. after a hot reload. [...]
@mustCallSuper, @protected, inherited
registerSignalServiceExtension({String name, AsyncCallback callback}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes no arguments and returns no value. [...]
@protected, inherited
registerBoolServiceExtension({String name, AsyncValueGetter<bool> getter, AsyncValueSetter<bool> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes a single argument "enabled" which can have the value "true" or the value "false" or can be omitted to read the current value. (Any value other than "true" is considered equivalent to "false". Other arguments are ignored.) [...]
@protected, inherited
registerNumericServiceExtension({String name, AsyncValueGetter<double> getter, AsyncValueSetter<double> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes a single argument with the same name as the method which, if present, must have a value that can be parsed by double.parse, and can be omitted to read the current value. (Other arguments are ignored.) [...]
@protected, inherited
postEvent(String eventKind, Map<String, dynamic> eventData) → void
All events dispatched by a BindingBase use this method instead of calling developer.postEvent directly so that tests for BindingBase can track which events were dispatched by overriding this method.
@protected, inherited
registerStringServiceExtension({String name, AsyncValueGetter<String> getter, AsyncValueSetter<String> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which optionally takes a single argument with the name "value". If the argument is omitted, the value is to be read, otherwise it is to be set. Returns the current value. [...]
@protected, inherited
registerServiceExtension({String name, ServiceExtensionCallback callback}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"). [...]
@protected, inherited
toString() String
Returns a string representation of this object.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
createBinaryMessenger() BinaryMessenger
Creates a default BinaryMessenger instance that can be used for sending platform messages.
@protected, inherited
initLicenses() → void
Adds relevant licenses to the LicenseRegistry. [...]
@mustCallSuper, @protected, inherited
readInitialLifecycleStateFromNativeWindow() → void
Initializes the lifecycleState with the initialLifecycleState from the window. [...]
@protected, inherited
addTimingsCallback(TimingsCallback callback) → void
Add a TimingsCallback that receives FrameTiming sent from the engine. [...]
inherited
removeTimingsCallback(TimingsCallback callback) → void
Removes a callback that was earlier added by addTimingsCallback.
inherited
handleAppLifecycleStateChanged(AppLifecycleState state) → void
Called when the application lifecycle state changes. [...]
@mustCallSuper, @protected, inherited
scheduleTask<T>(TaskCallback<T> task, Priority priority, {String debugLabel, Flow flow}) Future<T>
Schedules the given task with the given priority and returns a Future that completes to the task's eventual return value. [...]
inherited
handleEventLoopCallback() bool
Execute the highest-priority task, if it is of a high enough priority. [...]
@visibleForTesting, inherited
scheduleFrameCallback(FrameCallback callback, {bool rescheduling: false}) int
Schedules the given transient frame callback. [...]
inherited
cancelFrameCallbackWithId(int id) → void
Cancels the transient frame callback with the given id. [...]
inherited
debugAssertNoTransientCallbacks(String reason) bool
Asserts that there are no registered transient callbacks; if there are, prints their locations and throws an exception. [...]
inherited
addPersistentFrameCallback(FrameCallback callback) → void
Adds a persistent frame callback. [...]
inherited
addPostFrameCallback(FrameCallback callback) → void
Schedule a callback for the end of this frame. [...]
inherited
ensureFrameCallbacksRegistered() → void
@protected, inherited
ensureVisualUpdate() → void
Schedules a new frame using scheduleFrame if this object is not currently producing a frame. [...]
inherited
scheduleFrame() → void
If necessary, schedules a new frame by calling Window.scheduleFrame. [...]
inherited
scheduleForcedFrame() → void
Schedules a new frame by calling Window.scheduleFrame. [...]
inherited
scheduleWarmUpFrame() → void
Schedule a frame to run as soon as possible, rather than waiting for the engine to request a frame in response to a system "Vsync" signal. [...]
inherited
resetEpoch() → void
Prepares the scheduler for a non-monotonic change to how time stamps are calculated. [...]
inherited
handleBeginFrame(Duration rawTimeStamp) → void
Called by the engine to prepare the framework to produce a new frame. [...]
inherited
handleDrawFrame() → void
Called by the engine to produce a new frame. [...]
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited

Static Properties

instance PaintingBinding
The current PaintingBinding, if one has been created.
read-only, override
shaderWarmUp ShaderWarmUp
ShaderWarmUp to be executed during initInstances. [...]
read / write