如何将“ this”从ClassA传递到ClassB？

Question

I am trying to create a global class with multiple modules inside it. I am rewriting the code from Javascript to Dart.

Javascript

import ModuleA from './modules/a'
import ModuleB from './modules/b'
import ModuleC from './modules/c'

class Parent {
  constructor() {
    this.moduleA = new ModuleA(this)
    this.moduleB = new ModuleB(this)
    this.moduleC = new ModuleC(this)
  }
}

Dart

import 'modules/a.dart';
import 'modules/b.dart';
import 'modules/c.dart';

class Parent {
  ModuleA moduleA = ModuleA(parent: Parent());
  ModuleB moduleB = ModuleB(parent: Parent());
  ModuleC moduleC = ModuleC(parent: Parent());
}

After build I get this error:

[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Stack Overflow

Answer 1

Your Dart class should have a constructor that initializes the members and passes this when constructing the members:

import 'modules/a.dart';
import 'modules/b.dart';
import 'modules/c.dart';

class Parent {
  Parent() {
    moduleA = ModuleA(parent: this);
    moduleB = ModuleB(parent: this);
    moduleC = ModuleC(parent: this);
  }

  ModuleA moduleA;
  ModuleB moduleB;
  ModuleC moduleC;
}

Answer 2

you're not quite using classes right, please go to this link for an explanation

import ModuleA from './modules/a'
import ModuleB from './modules/b'
import ModuleC from './modules/c'

class Parent {
  constructor(){
    this.moduleA = new ModuleA(this);
    this.moduleB = new ModuleB(this);
    this.moduleC = new ModuleC(this);
  }
}```