package main
import (
	"fmt"
)
type IComponent interface {
	Print()
}
// root class
type Composite struct {
	Name string
	List []IComponent
}
func NewComposite(name string) *Composite {
	var list []IComponent
	return &Composite{
		name,
		list,
	}
}
func (c *Composite) Add(ic IComponent) {
	c.List = append(c.List, ic)
}
func (c *Composite) Print() {
	// print leader
	fmt.Printf("print %s\n", c.Name)
	// print follower
	for _, cc := range c.List {
		cc.Print()
	}
}
// leaf class
type Picture struct {
	Composite
}
func (m *Picture) Print() {
	fmt.Printf("print Picture(%s)\n", m.Name)
}
type Button struct {
	Composite
}
func (m *Button) Print() {
	fmt.Printf("print Button(%s)\n", m.Name)
}
type Label struct {
	Composite
}
func (m *Label) Print() {
	fmt.Printf("print Label(%s)\n", m.Name)
}
type TextBox struct {
	Composite
}
func (m *TextBox) Print() {
	fmt.Printf("print TextBox(%s)\n", m.Name)
}
type PasswordBox struct {
	Composite
}
func (m *PasswordBox) Print() {
	fmt.Printf("print PasswordBox(%s)\n", m.Name)
}
type CheckBox struct {
	Composite
}
func (m *CheckBox) Print() {
	fmt.Printf("print CheckBox(%s)\n", m.Name)
}
type LinkLabel struct {
	Composite
}
func (m *LinkLabel) Print() {
	fmt.Printf("print LinkLabel(%s)\n", m.Name)
}
func main() {
	winform := NewComposite("WinForm(WINDOW窗口)")
	picture := Picture{Composite{"LOGO图片", nil}}
	button1 := Button{Composite{"登陆", nil}}
	button2 := Button{Composite{"注册", nil}}
	frame1 := NewComposite("Frame(FRAME1)")
	label1 := Label{Composite{"用户名", nil}}
	textbox1 := TextBox{Composite{"文本框", nil}}
	label2 := Label{Composite{"密码", nil}}
	passwordbox := PasswordBox{Composite{"密码框", nil}}
	checkbox := CheckBox{Composite{"复选框", nil}}
	textbox2 := TextBox{Composite{"记住用户名", nil}}
	linklabel := LinkLabel{Composite{"忘记密码", nil}}
	frame1.Add(&label1)
	frame1.Add(&textbox1)
	frame1.Add(&label2)
	frame1.Add(&passwordbox)
	frame1.Add(&checkbox)
	frame1.Add(&textbox2)
	frame1.Add(&linklabel)
	winform.Add(&picture)
	winform.Add(&button1)
	winform.Add(&button2)
	winform.Add(frame1)
	winform.Print()
}