1+ ## tkinter and time modules are inbuilt
2+ from tkinter import *
3+ import time
4+ 5+ def run ():
6+ global root
7+ root = Tk ()
8+ root .title ("Stopwatch APP" )
9+ width = 400
10+ height = 160
11+ screen_width = root .winfo_screenwidth ()
12+ screen_height = root .winfo_screenheight ()
13+ x = (screen_width / 2 ) - (width / 2 )
14+ y = (screen_height / 2 ) - (height / 2 )
15+ root .geometry ("%dx%d+%d+%d" % (width , height , x , y ))
16+ Top = Frame (root )
17+ Top .pack (side = TOP )
18+ stopWatch = StopWatch (root )
19+ stopWatch .pack (side = TOP ,pady = 15 )
20+ Bottom = Frame (root , width = 400 )
21+ Bottom .pack (side = BOTTOM )
22+ Start = Button (Bottom , text = 'Start' , command = stopWatch .Start , width = 20 , height = 2 , bg = "green" )
23+ Start .pack (side = LEFT )
24+ Stop = Button (Bottom , text = 'Stop' , command = stopWatch .Stop , width = 20 , height = 2 , bg = "red" )
25+ Stop .pack (side = LEFT )
26+ Reset = Button (Bottom , text = 'Reset' , command = stopWatch .Reset , width = 15 , height = 2 )
27+ Reset .pack (side = LEFT )
28+ root .config (bg = "black" )
29+ root .mainloop ()
30+ 31+ 32+ class StopWatch (Frame ):
33+ def __init__ (self , parent = None , ** kw ):
34+ '''When object is initialized'''
35+ Frame .__init__ (self , parent , kw )
36+ self .startTime = 0.0
37+ self .nextTime = 0.0
38+ self .onRunning = 0
39+ self .timestr = StringVar ()
40+ self .MakeWidget ()
41+ def Updater (self ):
42+ '''update the time shown'''
43+ self .nextTime = time .time () - self .startTime
44+ self .SetTime (self .nextTime )
45+ self .timer = self .after (1 , self .Updater )
46+ def MakeWidget (self ):
47+ '''make widget for displaying time'''
48+ timeText = Label (self , textvariable = self .timestr , font = ("callibri" , 50 ), fg = "yellow" , bg = "grey" )
49+ self .SetTime (self .nextTime )
50+ timeText .pack (fill = X , expand = NO , pady = 2 , padx = 2 )
51+ def SetTime (self , nextElap ):
52+ '''set time that is to be displayed'''
53+ mins = int (nextElap / 60 )
54+ secs = int (nextElap - mins * 60.0 )
55+ milisecs = int ((nextElap - mins * 60.0 - secs ) * 100 )
56+ self .timestr .set ('%02d:%02d:%02d' % (mins , secs , milisecs ))
57+ def Start (self ):
58+ '''start stopwatch'''
59+ if not self .onRunning :
60+ self .startTime = time .time () - self .nextTime
61+ self .Updater ()
62+ self .onRunning = 1
63+ def Stop (self ):
64+ '''stop stopwatch'''
65+ if self .onRunning :
66+ self .after_cancel (self .timer )
67+ self .nextTime = time .time () - self .startTime
68+ self .SetTime (self .nextTime )
69+ self .onRunning = 0
70+ def Reset (self ):
71+ '''reset stopwatch'''
72+ self .startTime = time .time ()
73+ self .nextTime = 0.0
74+ self .SetTime (self .nextTime )
75+ 76+ 77+ 78+ 79+ 80+ if __name__ == '__main__' :
81+ run ()
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