from tkinter import *
import tkinter.font as tkFont # 导入了一个字体

class Screensaver():
 txt_1 = [] # 用来储存实例对象
 i = 1 # 用于后期判断是否更新单词表
 def __init__(self):
 self.win = Tk() # 基于tkiner中的Tk()方法实例个对象
 self.ft = tkFont.Font(family='Fixdsys', size=30, weight=tkFont.BOLD) # 修改字体的方法
 self.width = self.win.winfo_screenwidth() # 获取屏幕大小
 self.height= self.win.winfo_screenheight()
 
 self.win.overrideredirect(1) # 全屏设置
 self.win.attributes('-alpha',0.3) # 以参数alpha的方式设置透明度


 # 绑定事件
 self.win.bind('<Any-Button>',self.exit_screensaver) # 单击鼠标即弹出
 self.canvas=Canvas(self.win,width=self.width,height=self.height,bg='#00FFFF')
 self.canvas.pack()

 self.win.mainloop()

 def exit_screensaver(self,event): # 这里必须要个参数event
 self.win.destroy()

Screensaver() # 实例化

class Text_screen():
 list_box = [i for i in range(20,1080,50)] # 22 个个数，分别代表屏幕的高度位置
 i = 0 # 用来在高度上取值
 def __init__(self,canvas,ft,width,height,text_1):
 self.canvas = canvas
 self.ft = ft
 self.text_1 = text_1
 self.x_pos = width
 self.x_move = -1
 self.create_text()

 def create_text(self): # 创建方法
 self.x1 = self.x_pos-100
 self.item = self.canvas.create_text(self.x1,self.list_box[Text_screen.i],text=self.text_1,font=self.ft,fill='red',anchor=NW)
 if Text_screen.i == len(Text_screen.list_box)-1:
  Text_screen.i = 0
 else: Text_screen.i += 1

 def move_text(self): # 移动文字
 self.canvas.move(self.item, self.x_move,0)
 self.x1 += self.x_move

 def birth_list(self): #生成文字，
 i = randint(0,2064)
 self.str_text = linecache.getlines('six.txt')[i:i+21] # 这里需要导入模块：linecache，并且这里的文件是单词文本，要注意它的编码格式。
 if self.i == 1:
  for my_text in self.str_text:
  txt = Text_screen(self.canvas,self.ft,self.width,self.height,my_text)
  self.list_.append(txt)
 else: pass
 def exit_screensaver(self,event): # 这里必须要个参数event
 self.win.destroy()

 def run_screensaver(self): # 循环体 ，不断更新屏幕内容
 if self.i == 1:
  for emumt in self.list_:
  emumt.move_text()
  if emumt.x1<= -30:
   emumt
   self.i = -1
   self.delect()
   self.list_ =[]
   self.birth_list()
   for my_text in self.str_text:
   txt = Text_screen(self.canvas,self.ft,self.width,self.height,my_text)
   self.list_.append(txt)
   break
 else:
  self.i *= -1
 self.canvas.after(1,self.run_screensaver) # 第一个参数是间隔事件吧？第二个是调用函数

 def delect(self):# 不断的删除屏幕对象
 for em in self.list_:
  self.canvas.delete(em.item)