Package io.flutter.plugin.platform

Class PlatformViewsController

java.lang.Object

io.flutter.plugin.platform.PlatformViewsController

All Implemented Interfaces:

PlatformViewsAccessibilityDelegate

public class PlatformViewsController
extends Object
implements PlatformViewsAccessibilityDelegate

Manages platform views.

Each FlutterEngine or FlutterPluginRegistry has a single platform views controller. A platform views controller can be attached to at most one Flutter view.

Constructor Summary

Constructors

Constructor	Description
PlatformViewsController()

Method Summary

Modifier and Type	Method	Description
void	attach(Context context, TextureRegistry textureRegistry, DartExecutor dartExecutor)	Attaches this platform views controller to its input and output channels.
void	attachAccessibilityBridge(AccessibilityBridge accessibilityBridge)	Attaches an accessibility bridge for this platform views accessibility delegate.
void	attachTextInputPlugin(TextInputPlugin textInputPlugin)	Attaches this controller to a text input plugin.
void	attachToFlutterRenderer(FlutterRenderer flutterRenderer)
void	attachToView(FlutterView newFlutterView)	Attaches the controller to a FlutterView.
boolean	checkInputConnectionProxy(View view)	Returns true if Flutter should perform input connection proxying for the view.
FlutterOverlaySurface	createOverlaySurface()	Creates an overlay surface while the Flutter view is rendered by FlutterImageView.
FlutterOverlaySurface	createOverlaySurface(FlutterImageView imageView)	Creates and tracks the overlay surface.
void	destroyOverlaySurfaces()	Destroys the overlay surfaces and removes them from the view hierarchy.
void	detach()	Detaches this platform views controller.
void	detachAccessibilityBridge()	Detaches the current accessibility bridge.
void	detachFromView()	Detaches the controller from FlutterView.
void	detachTextInputPlugin()	Detaches this controller from the currently attached text input plugin.
View	getPlatformViewById(int viewId)	Returns the root of the view hierarchy for the platform view with the requested id, or null if there is no corresponding view.
PlatformViewRegistry	getRegistry()
void	onAttachedToJNI()	Invoked when the FlutterEngine that owns this PlatformViewsController attaches to JNI.
void	onBeginFrame()
void	onDetachedFromJNI()	Invoked when the FlutterEngine that owns this PlatformViewsController detaches from JNI.
void	onDisplayOverlaySurface(int id, int x, int y, int width, int height)	Called when an overlay surface is displayed in the current frame.
void	onDisplayPlatformView(int viewId, int x, int y, int width, int height, int viewWidth, int viewHeight, FlutterMutatorsStack mutatorsStack)	Called when a platform view id displayed in the current frame.
void	onEndFrame()	Called by FlutterJNI when the Flutter frame was submitted.
void	onPreEngineRestart()
void	setSoftwareRendering(boolean useSoftwareRendering)	Sets whether Flutter uses software rendering.
MotionEvent	toMotionEvent(float density, PlatformViewsChannel.PlatformViewTouch touch, boolean usingVirtualDiplay)
boolean	usesVirtualDisplay(int id)	Returns true if the platform view uses virtual displays.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PlatformViewsController

public PlatformViewsController()

Method Detail

toMotionEvent

public MotionEvent toMotionEvent(float density,
                                 PlatformViewsChannel.PlatformViewTouch touch,
                                 boolean usingVirtualDiplay)

attach

public void attach(@Nullable
                   Context context,
                   @NonNull
                   TextureRegistry textureRegistry,
                   @NonNull
                   DartExecutor dartExecutor)

Attaches this platform views controller to its input and output channels.

Parameters:

context - The base context that will be passed to embedded views created by this controller. This should be the context of the Activity hosting the Flutter application.

textureRegistry - The texture registry which provides the output textures into which the embedded views will be rendered.

dartExecutor - The dart execution context, which is used to set up a system channel.

setSoftwareRendering

public void setSoftwareRendering(boolean useSoftwareRendering)

Sets whether Flutter uses software rendering.

When software rendering is used, no GL context is available on the raster thread. When this is set to true, there's no Flutter composition of Android views and Flutter widgets since GL textures cannot be used.

Software rendering is only used for testing in emulators, and it should never be set to true in a production environment.

Parameters:

useSoftwareRendering - Whether software rendering is used.

detach

@UiThread
public void detach()

Detaches this platform views controller.

This is typically called when a Flutter applications moves to run in the background, or is destroyed. After calling this the platform views controller will no longer listen to it's previous messenger, and will not maintain references to the texture registry, context, and messenger passed to the previous attach call.

attachToView

public void attachToView(@NonNull
                         FlutterView newFlutterView)

Attaches the controller to a FlutterView.

When FlutterFragment is used, this method is called after the device rotates since the FlutterView is recreated after a rotation.

detachFromView

public void detachFromView()

Detaches the controller from FlutterView.

When FlutterFragment is used, this method is called when the device rotates since the FlutterView is detached from the fragment. The next time the fragment needs to be displayed, a new Flutter view is created, so attachToView is called again.

attachAccessibilityBridge

public void attachAccessibilityBridge(@NonNull
                                      AccessibilityBridge accessibilityBridge)

Description copied from interface: PlatformViewsAccessibilityDelegate

Attaches an accessibility bridge for this platform views accessibility delegate.

Accessibility events originating in platform views belonging to this delegate will be delegated to this accessibility bridge.

Specified by:

attachAccessibilityBridge in interface PlatformViewsAccessibilityDelegate

detachAccessibilityBridge

public void detachAccessibilityBridge()

Description copied from interface: PlatformViewsAccessibilityDelegate

Detaches the current accessibility bridge.

Any accessibility events sent by platform views belonging to this delegate will be ignored until a new accessibility bridge is attached.

Specified by:

detachAccessibilityBridge in interface PlatformViewsAccessibilityDelegate

attachTextInputPlugin

public void attachTextInputPlugin(@NonNull
                                  TextInputPlugin textInputPlugin)

Attaches this controller to a text input plugin.

While a text input plugin is available, the platform views controller interacts with it to facilitate delegation of text input connections to platform views.

A platform views controller should be attached to a text input plugin whenever it is possible for the Flutter framework to receive text input.

detachTextInputPlugin

public void detachTextInputPlugin()

Detaches this controller from the currently attached text input plugin.

checkInputConnectionProxy

public boolean checkInputConnectionProxy(@Nullable
                                         View view)

Returns true if Flutter should perform input connection proxying for the view.

If the view is a platform view managed by this platform views controller returns true. Else if the view was created in a platform view's VD, delegates the decision to the platform view's View.checkInputConnectionProxy(View) method. Else returns false.

getRegistry

public PlatformViewRegistry getRegistry()

onAttachedToJNI

public void onAttachedToJNI()

Invoked when the FlutterEngine that owns this PlatformViewsController attaches to JNI.

onDetachedFromJNI

public void onDetachedFromJNI()

Invoked when the FlutterEngine that owns this PlatformViewsController detaches from JNI.

onPreEngineRestart

public void onPreEngineRestart()

getPlatformViewById

@Nullable
public View getPlatformViewById(int viewId)

Description copied from interface: PlatformViewsAccessibilityDelegate

Returns the root of the view hierarchy for the platform view with the requested id, or null if there is no corresponding view.

Specified by:

getPlatformViewById in interface PlatformViewsAccessibilityDelegate

usesVirtualDisplay

public boolean usesVirtualDisplay(int id)

Description copied from interface: PlatformViewsAccessibilityDelegate

Returns true if the platform view uses virtual displays.

Specified by:

usesVirtualDisplay in interface PlatformViewsAccessibilityDelegate

attachToFlutterRenderer

public void attachToFlutterRenderer(@NonNull
                                    FlutterRenderer flutterRenderer)

onDisplayPlatformView

public void onDisplayPlatformView(int viewId,
                                  int x,
                                  int y,
                                  int width,
                                  int height,
                                  int viewWidth,
                                  int viewHeight,
                                  @NonNull
                                  FlutterMutatorsStack mutatorsStack)

Called when a platform view id displayed in the current frame.

Parameters:

viewId - The ID of the platform view.

x - The left position relative to FlutterView.

y - The top position relative to FlutterView.

width - The width of the platform view.

height - The height of the platform view.

viewWidth - The original width of the platform view before applying the mutator stack.

viewHeight - The original height of the platform view before applying the mutator stack.

mutatorsStack - The mutator stack. This member is not intended for public use, and is only visible for testing.

onDisplayOverlaySurface

public void onDisplayOverlaySurface(int id,
                                    int x,
                                    int y,
                                    int width,
                                    int height)

Called when an overlay surface is displayed in the current frame.

Parameters:

id - The ID of the surface.

x - The left position relative to FlutterView.

y - The top position relative to FlutterView.

width - The width of the surface.

height - The height of the surface. This member is not intended for public use, and is only visible for testing.

onBeginFrame

public void onBeginFrame()

onEndFrame

public void onEndFrame()

Called by FlutterJNI when the Flutter frame was submitted.

This member is not intended for public use, and is only visible for testing.

createOverlaySurface

@NonNull
public FlutterOverlaySurface createOverlaySurface(@NonNull
                                                  FlutterImageView imageView)

Creates and tracks the overlay surface.

Parameters:

imageView - The surface that displays the overlay.

Returns:

Wrapper object that provides the layer id and the surface. This member is not intended for public use, and is only visible for testing.

createOverlaySurface

@NonNull
public FlutterOverlaySurface createOverlaySurface()

Creates an overlay surface while the Flutter view is rendered by FlutterImageView.

This method is invoked by FlutterJNI only.

This member is not intended for public use, and is only visible for testing.

destroyOverlaySurfaces

public void destroyOverlaySurfaces()

Destroys the overlay surfaces and removes them from the view hierarchy.

This method is used only internally by FlutterJNI.