Create/Impl pattern.

Author: ilopX

patterns/mediator/conceptual/components/component1.dart

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+import '../pattern/mediator.dart';
+
+class Component1 extends Component {
+  final sate = 'Cmp1';
+
+  void doOne() {
+    print('call Component1.doOne()');
+    mediator?.notify(this, 'doOne');
+  }
+}

patterns/mediator/conceptual/components/component2.dart

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+import '../pattern/mediator.dart';
+
+class Component2 extends Component {
+  final name = 'Two';
+
+  void doTwo() {
+    print('call Component2.doTwo()');
+    mediator?.notify(this, 'doTwo');
+  }
+}

patterns/mediator/conceptual/concrete_mediator/concrete_mediator.dart

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+import '../components/component1.dart';
+import '../components/component2.dart';
+import '../pattern/mediator.dart';
+
+class ConcreteMediator extends Mediator {
+  final Component1 component1;
+  final Component2 component2;
+
+  ConcreteMediator(this.component1, this.component2) {
+    applyThisMediator(component1);
+    applyThisMediator(component2);
+  }
+
+  @override
+  void notify(Component component, String event) {
+    print('ConcreteMediator.notify(event: "$event")');
+
+    if (component == component1) {
+      reactComponentOne();
+    } else if (component == component2) {
+      reactComponentTwo();
+    }
+  }
+
+  void reactComponentOne() {
+    print('ConcreteMediator.reactComponentOne()');
+    print('use component2.name = "${component2.name}"');
+  }
+
+  void reactComponentTwo() {
+    print('ConcreteMediator.reactComponentTwo()');
+    print('use component1.sate = "${component1.sate}"');
+  }
+}

patterns/mediator/conceptual/main.dart

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+import 'components/component1.dart';
+import 'components/component2.dart';
+import 'concrete_mediator/concrete_mediator.dart';
+
+void main() {
+  final component1 = Component1();
+  final component2 = Component2();
+
+  ConcreteMediator(component1, component2);
+
+  component1.doOne();
+  print('');
+  component2.doTwo();
+}

patterns/mediator/conceptual/pattern/component.dart

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+part of mediator;
+
+class Component {
+  get mediator => _mediator;
+
+  Mediator? _mediator;
+}

patterns/mediator/conceptual/pattern/mediator.dart

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+library mediator;
+
+part 'component.dart';
+
+abstract class Mediator {
+  void notify(Component component, String event);
+
+  void applyThisMediator(Component component) {
+    component._mediator = this;
+  }
+}