Mega Code Archive

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()