A calculator
from Tkinter import *
import Pmw, string
class SLabel(Frame):
""" SLabel defines a 2-sided label within a Frame. The
left hand label has blue letters the right has white letters """
def __init__(self, master, leftl, rightl):
Frame.__init__(self, master, bg='gray40')
self.pack(side=LEFT, expand=YES, fill=BOTH)
Label(self, text=leftl, fg='steelblue1',
font=("arial", 6, "bold"), width=5, bg='gray40').pack(
side=LEFT, expand=YES, fill=BOTH)
Label(self, text=rightl, fg='white',
font=("arial", 6, "bold"), width=1, bg='gray40').pack(
side=RIGHT, expand=YES, fill=BOTH)
class Key(Button):
def __init__(self, master, font=('arial', 8, 'bold'),
fg='white',width=5, borderwidth=5, **kw):
kw['font'] = font
kw['fg'] = fg
kw['width'] = width
kw['borderwidth'] = borderwidth
apply(Button.__init__, (self, master), kw)
self.pack(side=LEFT, expand=NO, fill=NONE)
class Calculator(Frame):
def __init__(self, parent=None):
Frame.__init__(self, bg='gray40')
self.pack(expand=YES, fill=BOTH)
self.master.title('Tkinter Toolkit TT-42')
self.master.iconname('Tk-42')
self.calc = Evaluator() # This is our evaluator
self.buildCalculator() # Build the widgets
# This is an incomplete dictionary - a good exercise!
self.actionDict = {'second': self.doThis, 'mode': self.doThis,
'delete': self.doThis, 'alpha': self.doThis,
'stat': self.doThis, 'math': self.doThis,
'matrix': self.doThis, 'program': self.doThis,
'vars': self.doThis, 'clear': self.clearall,
'sin': self.doThis, 'cos': self.doThis,
'tan': self.doThis, 'up': self.doThis,
'X1': self.doThis, 'X2': self.doThis,
'log': self.doThis, 'ln': self.doThis,
'store': self.doThis, 'off': self.turnoff,
'neg': self.doThis, 'enter': self.doEnter,
}
self.current = ""
def doThis(self,action):
print '"%s" has not been implemented' % action
def turnoff(self, *args):
self.quit()
def clearall(self, *args):
self.current = ""
self.display.component('text').delete(1.0, END)
def doEnter(self, *args):
result = self.calc.runpython(self.current)
if result:
self.display.insert(END, '\n')
self.display.insert(END, '%s\n' % result, 'ans')
self.current = ""
def doKeypress(self, event):
key = event.char
if not key in ['\b']:
self.current = self.current + event.char
if key == '\b':
self.current = self.current[:-1]
def keyAction(self, key):
self.display.insert(END, key)
self.current = self.current + key
def evalAction(self, action):
try:
self.actionDict[action](action)
except KeyError:
pass
def buildCalculator(self):
FUN = 1 # Designates a Function
KEY = 0 # Designates a Key
KC1 = 'gray30' # Dark Keys
KC2 = 'gray50' # Light Keys
KC3 = 'steelblue1' # Light Blue Key
KC4 = 'steelblue' # Dark Blue Key
keys = [
[('2nd', '', '', KC3, FUN, 'second'), # Row 1
('Mode', 'Quit', '', KC1, FUN, 'mode'),
('Del', 'Ins', '', KC1, FUN, 'delete'),
('Alpha','Lock', '', KC2, FUN, 'alpha'),
('Stat', 'List', '', KC1, FUN, 'stat')],
[('Math', 'Test', 'A', KC1, FUN, 'math'), # Row 2
('Mtrx', 'Angle','B', KC1, FUN, 'matrix'),
('Prgm', 'Draw', 'C', KC1, FUN, 'program'),
('Vars', 'YVars','', KC1, FUN, 'vars'),
('Clr', '', '', KC1, FUN, 'clear')],
[('X-1', 'Abs', 'D', KC1, FUN, 'X1'), # Row 3
('Sin', 'Sin-1','E', KC1, FUN, 'sin'),
('Cos', 'Cos-1','F', KC1, FUN, 'cos'),
('Tan', 'Tan-1','G', KC1, FUN, 'tan'),
('^', 'PI', 'H', KC1, FUN, 'up')],
[('X2', 'Root', 'I', KC1, FUN, 'X2'), # Row 4
(',', 'EE', 'J', KC1, KEY, ','),
('(', '{', 'K', KC1, KEY, '('),
(')', '}', 'L', KC1, KEY, ')'),
('/', '', 'M', KC4, KEY, '/')],
[('Log', '10x', 'N', KC1, FUN, 'log'), # Row 5
('7', 'Un-1', 'O', KC2, KEY, '7'),
('8', 'Vn-1', 'P', KC2, KEY, '8'),
('9', 'n', 'Q', KC2, KEY, '9'),
('X', '[', 'R', KC4, KEY, '*')],
[('Ln', 'ex', 'S', KC1, FUN, 'ln'), # Row 6
('4', 'L4', 'T', KC2, KEY, '4'),
('5', 'L5', 'U', KC2, KEY, '5'),
('6', 'L6', 'V', KC2, KEY, '6'),
('-', ']', 'W', KC4, KEY, '-')],
[('STO', 'RCL', 'X', KC1, FUN, 'store'), # Row 7
('1', 'L1', 'Y', KC2, KEY, '1'),
('2', 'L2', 'Z', KC2, KEY, '2'),
('3', 'L3', '', KC2, KEY, '3'),
('+', 'MEM', '"', KC4, KEY, '+')],
[('Off', '', '', KC1, FUN, 'off'), # Row 8
('0', '', '', KC2, KEY, '0'),
('.', ':', '', KC2, KEY, '.'),
('(-)', 'ANS', '?', KC2, FUN, 'neg'),
('Enter','Entry','', KC4, FUN, 'enter')]]
self.display = Pmw.ScrolledText(self, hscrollmode='dynamic',
vscrollmode='dynamic', hull_relief='sunken',
hull_background='gray40', hull_borderwidth=10,
text_background='honeydew4', text_width=16,
text_foreground='black', text_height=6,
text_padx=10, text_pady=10, text_relief='groove',
text_font=('arial', 12, 'bold'))
self.display.pack(side=TOP, expand=YES, fill=BOTH)
self.display.tag_config('ans', foreground='white')
self.display.component('text').bind('<Key>', self.doKeypress)
self.display.component('text').bind('<Return>', self.doEnter)
for row in keys:
rowa = Frame(self, bg='gray40')
rowb = Frame(self, bg='gray40')
for p1, p2, p3, color, ktype, func in row:
if ktype == FUN:
a = lambda s=self, a=func: s.evalAction(a)
else:
a = lambda s=self, k=func: s.keyAction(k)
SLabel(rowa, p2, p3)
Key(rowb, text=p1, bg=color, command=a)
rowa.pack(side=TOP, expand=YES, fill=BOTH)
rowb.pack(side=TOP, expand=YES, fill=BOTH)
class Evaluator:
def __init__(self):
self.myNameSpace = {}
self.runpython("from math import *")
def runpython(self, code):
try:
return 'eval(code, self.myNameSpace, self.myNameSpace)'
except SyntaxError:
try:
exec code in self.myNameSpace, self.myNameSpace
except:
return 'Error'
Calculator().mainloop()
Related examples in the same category
