PlatformDispatcher class

Platform event dispatcher singleton.

The most basic interface to the host operating system's interface.

This is the central entry point for platform messages and configuration events from the platform.

It exposes the core scheduler API, the input event callback, the graphics drawing API, and other such core services.

It manages the list of the application's views as well as the configuration of various platform attributes.

Consider avoiding static references to this singleton through PlatformDispatcher.instance and instead prefer using a binding for dependency resolution such as WidgetsBinding.instance.platformDispatcher. See PlatformDispatcher.instance for more information about why this is preferred.



accessibilityFeatures AccessibilityFeatures
Additional accessibility features that may be enabled by the platform.
no setter
alwaysUse24HourFormat bool
The setting indicating whether time should always be shown in the 24-hour format.
no setter
brieflyShowPassword bool
Whether briefly displaying the characters as you type in obscured text fields is enabled in system settings.
no setter
defaultRouteName String
The route or path that the embedder requested when the application was launched.
no setter
displays Iterable<Display>
The current list of displays.
no setter
frameData FrameData
The FrameData object for the current frame.
no setter
hashCode int
The hash code for this object.
no setterinherited
implicitView FlutterView?
The FlutterView provided by the engine if the platform is unable to create windows, or, for backwards compatibility.
no setter
initialLifecycleState String
The lifecycle state immediately after dart isolate initialization.
no setter
locale Locale
The system-reported default locale of the device.
no setter
locales List<Locale>
The full system-reported supported locales of the device.
no setter
nativeSpellCheckServiceDefined bool
Whether the spell check service is supported on the current platform.
no setter
onAccessibilityFeaturesChanged VoidCallback?
A callback that is invoked when the value of accessibilityFeatures changes.
getter/setter pair
onBeginFrame FrameCallback?
A callback invoked when any view begins a frame.
getter/setter pair
onDrawFrame VoidCallback?
A callback that is invoked for each frame after onBeginFrame has completed and after the microtask queue has been drained.
getter/setter pair
onError ErrorCallback?
A callback that is invoked when an unhandled error occurs in the root isolate.
getter/setter pair
onFrameDataChanged VoidCallback?
A callback that is invoked when the window updates the FrameData.
getter/setter pair
onKeyData KeyDataCallback?
A callback that is invoked when key data is available.
getter/setter pair
onLocaleChanged VoidCallback?
A callback that is invoked whenever locale changes value.
getter/setter pair
onMetricsChanged VoidCallback?
A callback that is invoked whenever the ViewConfiguration of any of the views changes.
getter/setter pair
onPlatformBrightnessChanged VoidCallback?
A callback that is invoked whenever platformBrightness changes value.
getter/setter pair
onPlatformConfigurationChanged VoidCallback?
Called when the platform configuration changes.
getter/setter pair
onPlatformMessage PlatformMessageCallback?
Deprecated. Migrate to ChannelBuffers.setListener instead.
getter/setter pair
onPointerDataPacket PointerDataPacketCallback?
A callback that is invoked when pointer data is available.
getter/setter pair
onReportTimings TimingsCallback?
A callback that is invoked to report the FrameTiming of recently rasterized frames.
getter/setter pair
onSemanticsActionEvent SemanticsActionEventCallback?
A callback that is invoked whenever the user requests an action to be performed on a semantics node.
getter/setter pair
onSemanticsEnabledChanged VoidCallback?
A callback that is invoked when the value of semanticsEnabled changes.
getter/setter pair
onSystemFontFamilyChanged VoidCallback?
A callback that is invoked whenever systemFontFamily changes value.
getter/setter pair
onTextScaleFactorChanged VoidCallback?
A callback that is invoked whenever textScaleFactor changes value.
getter/setter pair
onViewFocusChange ViewFocusChangeCallback?
A callback invoked immediately after the focus is transitioned across FlutterViews.
getter/setter pair
platformBrightness Brightness
The setting indicating the current brightness mode of the host platform. If the platform has no preference, platformBrightness defaults to Brightness.light.
no setter
runtimeType Type
A representation of the runtime type of the object.
no setterinherited
semanticsEnabled bool
Whether the user has requested that updateSemantics be called when the semantic contents of a view changes.
no setter
systemFontFamily String?
The setting indicating the current system font of the host platform.
no setter
textScaleFactor double
The system-reported text scale.
no setter
views Iterable<FlutterView>
The current list of views, including top level platform windows used by the application.
no setter


computePlatformResolvedLocale(List<Locale> supportedLocales) Locale?
Performs the platform-native locale resolution.
getPersistentIsolateData() ByteData?
The embedder can specify data that the isolate can request synchronously on launch. This accessor fetches that data.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
registerBackgroundIsolate(RootIsolateToken token) → void
Registers the current isolate with the isolate identified with by the token. This is required if platform channels are to be used on a background isolate.
requestDartPerformanceMode(DartPerformanceMode mode) → void
Requests the Dart VM to adjusts the GC heuristics based on the requested performance_mode.
requestViewFocusChange({required int viewId, required ViewFocusState state, required ViewFocusDirection direction}) → void
Requests a focus change of the FlutterView with ID viewId.
scaleFontSize(double unscaledFontSize) double
Computes the scaled font size from the given unscaledFontSize, according to the user's platform preferences.
scheduleFrame() → void
Requests that, at the next appropriate opportunity, the onBeginFrame and onDrawFrame callbacks be invoked.
scheduleWarmUpFrame({required VoidCallback beginFrame, required VoidCallback drawFrame}) → 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.
sendPlatformMessage(String name, ByteData? data, PlatformMessageResponseCallback? callback) → void
Sends a message to a platform-specific plugin.
sendPortPlatformMessage(String name, ByteData? data, int identifier, SendPort port) → void
Sends a message to a platform-specific plugin via a SendPort.
setIsolateDebugName(String name) → void
Set the debug name associated with this platform dispatcher's root isolate.
toString() String
A string representation of this object.
updateSemantics(SemanticsUpdate update) → void
Change the retained semantics data about this platform dispatcher.
view({required int id}) FlutterView?
Returns the FlutterView with the provided ID if one exists, or null otherwise.


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

Static Properties

instance PlatformDispatcher
The PlatformDispatcher singleton.
no setter