class Singleton {
public:
  static Singleton& getInstance() {
    static Singleton instance;
    return instance;
  }
  void show(){
    std::cout << "Singleton\n";
  }
private:
  Singleton() = default;
  ~Singleton() = default;
  Singleton(const Singleton& instance) = delete;
  Singleton& operator=(const Singleton& instance) = delete;
};

#include <iostream>
#include <vector>
class Component {
public:
  Component(const std::string& name): _name(name){};
  virtual void draw() = 0;
  virtual ~Component() = default;
protected:
  std::string _name;
};
class Container : public Component {
public:
  Container(const std::string& name): Component(name){};
  void addComponent(Component& com) {_comList.push_back(&com);};
  virtual void draw();
  ~Container() = default;
private:
  std::vector<Component*> _comList;
};
void Container::draw() {
  for (auto& item : _comList) {
    item->draw();
  }
}
class WinForm : public Container{
public:
  WinForm(const std::string name): Container(name){};
  virtual void draw();
  ~WinForm() = default;
};
void WinForm::draw() {
  std::cout << "WinForm (" << _name << ")\n";
  Container::draw();
}
class Frame : public Container{
public:
  Frame(const std::string name): Container(name){};
  virtual void draw();
  ~Frame() = default;
};
void Frame::draw() {
  std::cout << "Frame (" << _name << ")\n";
  Container::draw();
}
class Picture : public Component {
public:
  Picture(const std::string& name) : Component(name){};
  virtual void draw() {std::cout << "Picture (" << _name << ")\n";};
  ~Picture() = default;
};
class Button : public Component {
public:
  Button(const std::string& name) : Component(name){};
  virtual void draw() {std::cout << "Button (" << _name << ")\n";};
  ~Button() = default;
};
class Label : public Component {
public:
  Label(const std::string& name) : Component(name){};
  virtual void draw() {std::cout << "Label (" << _name << ")\n";};
  ~Label() = default;
};
class LinkLabel : public Component {
public:
  LinkLabel(const std::string& name) : Component(name){};
  virtual void draw() {std::cout << "LinkLabel (" << _name << ")\n";};
  ~LinkLabel() = default;
};
class TextBox : public Component {
public:
  TextBox(const std::string& name) : Component(name){};
  virtual void draw() {std::cout << "TextBox (" << _name << ")\n";};
  ~TextBox() = default;
};
class PasswordBox : public Component {
public:
  PasswordBox(const std::string& name) : Component(name){};
  virtual void draw() {std::cout << "PasswordBox (" << _name << ")\n";};
  ~PasswordBox() = default;
};
class CheckBox : public Component {
public:
  CheckBox(const std::string& name) : Component(name){};
  virtual void draw() {std::cout << "CheckBox (" << _name << ")\n";};
  ~CheckBox() = default;
};
int main(){
    WinForm win = WinForm("Window窗口");
    Picture pic = Picture("Logo圖片");
    Button btn1 = Button("登錄");
    Button btn2 = Button("註冊");
    Frame frame = Frame("Frame1");
    Label label1 = Label("用戶名");
    TextBox textB1 = TextBox("文本框");
    Label label2 = Label("密碼");
    PasswordBox passB = PasswordBox("密碼框");
    CheckBox checkB = CheckBox("複選框");
    Label label3 = Label("記住用戶名");
    LinkLabel link = LinkLabel("忘記密碼");
    win.addComponent(pic);
    win.addComponent(btn1);
    win.addComponent(btn2);
    win.addComponent(frame);
    frame.addComponent(label1);
    frame.addComponent(textB1);
    frame.addComponent(label2);
    frame.addComponent(passB);
    frame.addComponent(checkB);
    frame.addComponent(label3);
    frame.addComponent(link);
    win.draw();
}