writeInstanceManagerApi method

@override void writeInstanceManagerApi(SwiftOptions generatorOptions, Root root, Indent indent, { required String dartPackageName, })

Writes the implementation of the API for the InstanceManager to indent.

Implementation

@override
void writeInstanceManagerApi(
  SwiftOptions generatorOptions,
  Root root,
  Indent indent, {
  required String dartPackageName,
}) {
  final String instanceManagerApiName =
      '${swiftInstanceManagerClassName(generatorOptions)}Api';

  final String removeStrongReferenceName =
      makeRemoveStrongReferenceChannelName(
    dartPackageName,
  );

  indent.writeScoped('private class $instanceManagerApiName {', '}', () {
    addDocumentationComments(
      indent,
      <String>[' The codec used for serializing messages.'],
      _docCommentSpec,
    );
    indent.writeln(
      'var codec: FlutterStandardMessageCodec { ${_getCodecName(generatorOptions)}.shared }',
    );
    indent.newln();

    addDocumentationComments(
      indent,
      <String>[' Handles sending and receiving messages with Dart.'],
      _docCommentSpec,
    );
    indent.writeln('unowned let binaryMessenger: FlutterBinaryMessenger');
    indent.newln();

    indent.writeScoped(
      'init(binaryMessenger: FlutterBinaryMessenger) {',
      '}',
      () {
        indent.writeln('self.binaryMessenger = binaryMessenger');
      },
    );
    indent.newln();

    addDocumentationComments(
      indent,
      <String>[
        ' Sets up an instance of `$instanceManagerApiName` to handle messages through the `binaryMessenger`.',
      ],
      _docCommentSpec,
    );
    indent.writeScoped(
      'static func setUpMessageHandlers(binaryMessenger: FlutterBinaryMessenger, instanceManager: ${swiftInstanceManagerClassName(generatorOptions)}?) {',
      '}',
      () {
        indent.writeln(
          'let codec = ${_getCodecName(generatorOptions)}.shared',
        );
        const String setHandlerCondition =
            'let instanceManager = instanceManager';
        _writeHostMethodMessageHandler(
          indent,
          name: 'removeStrongReference',
          channelName: removeStrongReferenceName,
          parameters: <Parameter>[
            Parameter(
              name: 'identifier',
              type: const TypeDeclaration(
                baseName: 'int',
                isNullable: false,
              ),
            ),
          ],
          returnType: const TypeDeclaration.voidDeclaration(),
          swiftFunction: 'method(withIdentifier:)',
          setHandlerCondition: setHandlerCondition,
          isAsynchronous: false,
          onCreateCall: (
            List<String> safeArgNames, {
            required String apiVarName,
          }) {
            return 'let _: AnyObject? = try instanceManager.removeInstance(${safeArgNames.single})';
          },
        );
        _writeHostMethodMessageHandler(
          indent,
          name: 'clear',
          channelName: makeClearChannelName(dartPackageName),
          parameters: <Parameter>[],
          returnType: const TypeDeclaration.voidDeclaration(),
          setHandlerCondition: setHandlerCondition,
          swiftFunction: null,
          isAsynchronous: false,
          onCreateCall: (
            List<String> safeArgNames, {
            required String apiVarName,
          }) {
            return 'try instanceManager.removeAllObjects()';
          },
        );
      },
    );
    indent.newln();

    addDocumentationComments(
      indent,
      <String>[
        ' Sends a message to the Dart `InstanceManager` to remove the strong reference of the instance associated with `identifier`.',
      ],
      _docCommentSpec,
    );
    _writeFlutterMethod(
      indent,
      generatorOptions: generatorOptions,
      name: 'removeStrongReference',
      parameters: <Parameter>[
        Parameter(
          name: 'identifier',
          type: const TypeDeclaration(baseName: 'int', isNullable: false),
        )
      ],
      returnType: const TypeDeclaration.voidDeclaration(),
      channelName: removeStrongReferenceName,
      swiftFunction: null,
    );
  });
}