python哨兵循环_Python：deadloop之非模态交互界面（模态循环）（哨兵循环）

deadloop之非模态交互界面(模态循环)(哨兵循环)

通过无限循环，条件退出，实现多模态的交互界面

主要功能1：通过键盘按键g\w\r\b进行界面颜色改变，按q退出

主要功能2：点击界面某处生成输入框，回车使输入框内的文字固定在界面

当等待一个特殊的键入时可用，(以return为例)

while win.getkey() != 'Return':

pass

#我的菜鸡简略版本

from graphics import *

win = GraphWin('Click and Type', 500, 500)

while True:

keyout = win.checkKey()

if keyout == 'q':

break

elif keyout == 'r':

win.setBackground('pink')

elif keyout == 'w':

win.setBackground('white')

elif keyout == 'b':

win.setBackground('lightblue')

elif keyout == 'g':

win.setBackground('lightgray')

pt = win.checkMouse()

if pt:

entry = Entry(pt, 5)

entry.draw(win)

while True:

key = win.checkKey()

if key == 'Return':

break

elif key:print(key)

entry.undraw()

text = entry.getText()

Text(pt, text).draw(win)

# 教材版本(不同功能函数定义调用)

# event_loop2.py --- color-changing window

from graphics import *

def handleKey(k, win):

if k == 'r':

win.setBackground('pink')

elif k == 'w':

win.setBackground('white')

elif k == 'g':

win.setBackground('lightgray')

elif k == 'b':

win.setBackground('lightblue')

def handleClick(pt, win):

# create an Entry for user to type in

entry = Entry(pt, 10)

entry.draw(win)

# Go modal: loop until user types key

while True:

key = win.getKey()

if key == 'Return': break

else:print(key)

# undraw the entry and create and draw Text.

entry.undraw()

typed = entry.getText()

Text(pt, typed).draw(win)

# clear (ignore) ang mouse click that occurred during text entry

win.checkMouse()

def main():

win = GraphWin('Click and Type', 500, 500)

# Event loop: handle presses and mouse clicks until the user

# press the 'q' key.

while True:

key = win.checkKey()

if key == 'q': # loop exit

break

if key:

handleKey(key, win)

pt = win.checkMouse()

if pt:

handleClick(pt, win)

win.close()

main()

运行效果：

总结

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