第三周课后练习

interface IComponent {
  add(c: IComponent);
  remove(c: IComponent);
  print();
}
abstract class Control implements IComponent {
  add(c: IComponent) {
    throw new Error("Method not implemented.");
  }
  remove(c: IComponent) {
    throw new Error("Method not implemented.");
  }
  abstract print();
}
abstract class Container implements IComponent {
  private _children = new Set<IComponent>();
  add(c: IComponent) {
    this._children.add(c);
  }
  remove(c: IComponent) {
    this._children.delete(c);
  }
  print() {
    this.printSelf();
    this._children.forEach((c) => c.print());
  }
  abstract printSelf();
}
class Form extends Container {
  printSelf() {
    console.log("print WinForm");
  }
}
class Frame extends Container {
  printSelf() {
    console.log("print Frame");
  }
}
class Picture extends Control {
  print() {
    console.log("print Picture");
  }
}
class Button extends Control {
  print() {
    console.log("print Button");
  }
}
class Label extends Control {
  print() {
    console.log("print Label");
  }
}
class CheckBox extends Control {
  print() {
    console.log("print CheckBox");
  }
}
class TextBox extends Control {
  print() {
    console.log("print TextBox");
  }
}
class LinkLabel extends Control {
  print() {
    console.log("print LinkLabel");
  }
}
class PasswordBox extends Control {
  print() {
    console.log("print PasswordBox");
  }
}
function main() {
  let w = new Form();
  w.add(new Picture());
  w.add(new Button());
  w.add(new Button());
  let f = new Frame();
  f.add(new Label());
  f.add(new CheckBox());
  f.add(new TextBox());
  f.add(new Label());
  f.add(new LinkLabel());
  f.add(new Label());
  f.add(new PasswordBox());
  w.add(f);
  w.print();
}
main();