243 lines
10 KiB
Objective-C
Executable File
243 lines
10 KiB
Objective-C
Executable File
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_FLUTTERENGINE_H_
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#define FLUTTER_FLUTTERENGINE_H_
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#import <Foundation/Foundation.h>
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#import <UIKit/UIKit.h>
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#include "FlutterBinaryMessenger.h"
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#include "FlutterDartProject.h"
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#include "FlutterMacros.h"
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#include "FlutterPlugin.h"
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#include "FlutterTexture.h"
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@class FlutterViewController;
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/**
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* The FlutterEngine class coordinates a single instance of execution for a
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* `FlutterDartProject`. It may have zero or one `FlutterViewController` at a
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* time, which can be specified via `-setViewController:`.
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* `FlutterViewController`'s `initWithEngine` initializer will automatically call
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* `-setViewController:` for itself.
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*
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* A FlutterEngine can be created independently of a `FlutterViewController` for
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* headless execution. It can also persist across the lifespan of multiple
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* `FlutterViewController` instances to maintain state and/or asynchronous tasks
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* (such as downloading a large file).
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*
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* Alternatively, you can simply create a new `FlutterViewController` with only a
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* `FlutterDartProject`. That `FlutterViewController` will internally manage its
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* own instance of a FlutterEngine, but will not guarantee survival of the engine
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* beyond the life of the ViewController.
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*
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* A newly initialized FlutterEngine will not actually run a Dart Isolate until
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* either `-runWithEntrypoint:` or `-runWithEntrypoint:libraryURI` is invoked.
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* One of these methods must be invoked before calling `-setViewController:`.
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*/
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FLUTTER_EXPORT
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@interface FlutterEngine
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: NSObject <FlutterBinaryMessenger, FlutterTextureRegistry, FlutterPluginRegistry>
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/**
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* Initialize this FlutterEngine with a `FlutterDartProject`.
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*
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* If the FlutterDartProject is not specified, the FlutterEngine will attempt to locate
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* the project in a default location (the flutter_assets folder in the iOS application
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* bundle).
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*
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* A newly initialized engine will not run the `FlutterDartProject` until either
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* `-runWithEntrypoint:` or `-runWithEntrypoint:libraryURI:` is called.
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*
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* FlutterEngine created with this method will have allowHeadlessExecution set to `YES`.
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* This means that the engine will continue to run regardless of whether a `FlutterViewController`
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* is attached to it or not, until `-destroyContext:` is called or the process finishes.
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*
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* @param labelPrefix The label prefix used to identify threads for this instance. Should
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* be unique across FlutterEngine instances, and is used in instrumentation to label
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* the threads used by this FlutterEngine.
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* @param projectOrNil The `FlutterDartProject` to run.
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*/
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- (instancetype)initWithName:(NSString*)labelPrefix project:(FlutterDartProject*)projectOrNil;
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/**
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* Initialize this FlutterEngine with a `FlutterDartProject`.
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*
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* If the FlutterDartProject is not specified, the FlutterEngine will attempt to locate
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* the project in a default location (the flutter_assets folder in the iOS application
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* bundle).
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*
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* A newly initialized engine will not run the `FlutterDartProject` until either
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* `-runWithEntrypoint:` or `-runWithEntrypoint:libraryURI:` is called.
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*
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* @param labelPrefix The label prefix used to identify threads for this instance. Should
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* be unique across FlutterEngine instances, and is used in instrumentation to label
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* the threads used by this FlutterEngine.
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* @param projectOrNil The `FlutterDartProject` to run.
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* @param allowHeadlessExecution Whether or not to allow this instance to continue
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* running after passing a nil `FlutterViewController` to `-setViewController:`.
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*/
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- (instancetype)initWithName:(NSString*)labelPrefix
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project:(FlutterDartProject*)projectOrNil
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allowHeadlessExecution:(BOOL)allowHeadlessExecution NS_DESIGNATED_INITIALIZER;
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/**
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* The default initializer is not available for this object.
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* Callers must use `-[FlutterEngine initWithName:project:]`.
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*/
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- (instancetype)init NS_UNAVAILABLE;
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+ (instancetype)new NS_UNAVAILABLE;
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/**
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* Runs a Dart program on an Isolate from the main Dart library (i.e. the library that
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* contains `main()`).
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*
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* The first call to this method will create a new Isolate. Subsequent calls will return
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* immediately.
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*
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* @param entrypoint The name of a top-level function from the same Dart
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* library that contains the app's main() function. If this is nil, it will
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* default to `main()`. If it is not the app's main() function, that function
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* must be decorated with `@pragma(vm:entry-point)` to ensure the method is not
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* tree-shaken by the Dart compiler.
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* @return YES if the call succeeds in creating and running a Flutter Engine instance; NO otherwise.
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*/
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- (BOOL)runWithEntrypoint:(NSString*)entrypoint;
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/**
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* Runs a Dart program on an Isolate using the specified entrypoint and Dart library,
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* which may not be the same as the library containing the Dart program's `main()` function.
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*
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* The first call to this method will create a new Isolate. Subsequent calls will return
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* immediately.
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*
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* @param entrypoint The name of a top-level function from a Dart library. If nil, this will
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* default to `main()`. If it is not the app's main() function, that function
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* must be decorated with `@pragma(vm:entry-point)` to ensure the method is not
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* tree-shaken by the Dart compiler.
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* @param uri The URI of the Dart library which contains the entrypoint method. IF nil,
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* this will default to the same library as the `main()` function in the Dart program.
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* @return YES if the call succeeds in creating and running a Flutter Engine instance; NO otherwise.
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*/
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- (BOOL)runWithEntrypoint:(NSString*)entrypoint libraryURI:(NSString*)uri;
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/**
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* Destroy running context for an engine.
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*
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* This method can be used to force the FlutterEngine object to release all resources.
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* After sending this message, the object will be in an unusable state until it is deallocated.
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* Accessing properties or sending messages to it will result in undefined behavior or runtime
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* errors.
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*/
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- (void)destroyContext;
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/**
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* Ensures that Flutter will generate a semantics tree.
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*
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* This is enabled by default if certain accessibility services are turned on by
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* the user, or when using a Simulator. This method allows a user to turn
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* semantics on when they would not ordinarily be generated and the performance
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* overhead is not a concern, e.g. for UI testing. Note that semantics should
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* never be programmatically turned off, as it would potentially disable
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* accessibility services an end user has requested.
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*
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* This method must only be called after launching the engine via
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* `-runWithEntrypoint:` or `-runWithEntryPoint:libraryURI`.
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*
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* Although this method returns synchronously, it does not guarantee that a
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* semantics tree is actually available when the method returns. It
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* synchronously ensures that the next frame the Flutter framework creates will
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* have a semantics tree.
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*
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* You can subscribe to semantics updates via `NSNotificationCenter` by adding
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* an observer for the name `FlutterSemanticsUpdateNotification`. The `object`
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* parameter will be the `FlutterViewController` associated with the semantics
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* update. This will asynchronously fire after a semantics tree has actually
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* built (which may be some time after the frame has been rendered).
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*/
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- (void)ensureSemanticsEnabled;
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/**
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* Sets the `FlutterViewController` for this instance. The FlutterEngine must be
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* running (e.g. a successful call to `-runWithEntrypoint:` or `-runWithEntrypoint:libraryURI`)
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* before calling this method. Callers may pass nil to remove the viewController
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* and have the engine run headless in the current process.
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*
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* A FlutterEngine can only have one `FlutterViewController` at a time. If there is
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* already a `FlutterViewController` associated with this instance, this method will replace
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* the engine's current viewController with the newly specified one.
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*
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* Setting the viewController will signal the engine to start animations and drawing, and unsetting
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* it will signal the engine to stop animations and drawing. However, neither will impact the state
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* of the Dart program's execution.
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*/
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@property(nonatomic, weak) FlutterViewController* viewController;
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/**
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* The `FlutterMethodChannel` used for localization related platform messages, such as
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* setting the locale.
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*/
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@property(nonatomic, readonly) FlutterMethodChannel* localizationChannel;
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/**
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* The `FlutterMethodChannel` used for navigation related platform messages.
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*
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* @see [Navigation
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* Channel](https://docs.flutter.io/flutter/services/SystemChannels/navigation-constant.html)
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* @see [Navigator Widget](https://docs.flutter.io/flutter/widgets/Navigator-class.html)
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*/
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@property(nonatomic, readonly) FlutterMethodChannel* navigationChannel;
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/**
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* The `FlutterMethodChannel` used for core platform messages, such as
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* information about the screen orientation.
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*/
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@property(nonatomic, readonly) FlutterMethodChannel* platformChannel;
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/**
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* The `FlutterMethodChannel` used to communicate text input events to the
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* Dart Isolate.
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*
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* @see [Text Input
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* Channel](https://docs.flutter.io/flutter/services/SystemChannels/textInput-constant.html)
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*/
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@property(nonatomic, readonly) FlutterMethodChannel* textInputChannel;
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/**
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* The `FlutterBasicMessageChannel` used to communicate app lifecycle events
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* to the Dart Isolate.
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*
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* @see [Lifecycle
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* Channel](https://docs.flutter.io/flutter/services/SystemChannels/lifecycle-constant.html)
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*/
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@property(nonatomic, readonly) FlutterBasicMessageChannel* lifecycleChannel;
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/**
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* The `FlutterBasicMessageChannel` used for communicating system events, such as
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* memory pressure events.
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*
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* @see [System
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* Channel](https://docs.flutter.io/flutter/services/SystemChannels/system-constant.html)
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*/
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@property(nonatomic, readonly) FlutterBasicMessageChannel* systemChannel;
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/**
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* The `FlutterBasicMessageChannel` used for communicating user settings such as
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* clock format and text scale.
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*/
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@property(nonatomic, readonly) FlutterBasicMessageChannel* settingsChannel;
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/**
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* The `NSURL` of the observatory for the service isolate.
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*
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* This is only set in debug and profile runtime modes, and only after the
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* observatory service is ready. In release mode or before the observatory has
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* started, it returns `nil`.
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*/
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@property(nonatomic, readonly) NSURL* observatoryUrl;
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@end
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#endif // FLUTTER_FLUTTERENGINE_H_
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