极客时间第 0 期架构师训练营第三周作业

package main
import (
	"fmt"
)
// interface
type Widget interface {
	Draw()
}
type BaseWidget struct {
	WidgetType string
	text       string
	subWidgets []Widget
}
// 添加子组件
func (w *BaseWidget) Add(widget Widget) {
	w.subWidgets = append(w.subWidgets, widget)
}
// 移除子组件
func (w *BaseWidget) Remove(idx int) {
	// todo: 检查idx的有效性
	// todo: 空间回收
	w.subWidgets[idx] = nil
}
// draw
func (w *BaseWidget) Draw() {
  fmt.Println("draw:", w.WidgetType, w.text) // todo:按不同类型调用不同算法
	for _, w := range w.subWidgets {
		if w == nil {
			continue
		}
		w.Draw()
	}
}
func main() {
	winform := BaseWidget{WidgetType: "WinForm", text: "Windown窗口"}
	picture := BaseWidget{WidgetType: "Picture", text: "logo图片"}
	buttonLogin := BaseWidget{WidgetType: "Button", text: "登录"}
	buttonReg := BaseWidget{WidgetType: "Button", text: "注册"}
	frame := BaseWidget{WidgetType: "Frame", text: "Frame1"}
	label1 := BaseWidget{WidgetType: "Lable", text: "用户名"}
	textbox := BaseWidget{WidgetType: "TextBox", text: "文本框"}
	label2 := BaseWidget{WidgetType: "Lable", text: "用户名"}
	passwdBox := BaseWidget{WidgetType: "PasswdBox", text: "密码框"}
	checkBox := BaseWidget{WidgetType: "CheckBox", text: "复选框"}
	text := BaseWidget{WidgetType: "Text", text: "记住用户名"}
	linkLable := BaseWidget{WidgetType: "LinkLable", text: "忘记密码"}
	winform.Add(&picture)
	winform.Add(&buttonLogin)
	winform.Add(&buttonReg)
	winform.Add(&frame)
	frame.Add(&label1)
	frame.Add(&textbox)
	frame.Add(&label2)
	frame.Add(&passwdBox)
	frame.Add(&checkBox)
	frame.Add(&text)
	frame.Add(&linkLable)
	winform.Draw()
}