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calculator.py
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calculator.py
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from tkinter import *
from tkinter import ttk
from tkinter import font
from themes import *
from SmartButton import SmartButton
"""
TKINTER NICE DOCUMENTATION:
https://tkdocs.com/tutorial/firstexample.html
"""
class Calculator:
def __init__(self, name: str):
self.root = Tk()
self.root.title(name)
self.root.rowconfigure(0, weight=1)
self.root.rowconfigure(1, weight=2)
self.root.rowconfigure(2, weight=5)
self.root.columnconfigure(0, weight=1)
self.root.geometry('350x400+650+200')
# global variables
self.newinput = False
self.division_error = False
self.fontlist = fontlist
self.font = StringVar()
self.font.trace_add('write', self.set_font)
self.theme = StringVar()
self.theme.trace_add('write', self.apply_theme)
# set styles
self.root.configure(background='#FEB7FF')
self.style = ttk.Style()
self.style.configure('TLabel', font=(self.font.get(), 20), background='#FEB7FF', foreground='#B5FFFE')
self.style.configure('TButton', font=(self.font.get(), 15), background='red', foreground='#B5FFFE')
# dict with number buttons and corresponding position (tuples)
self.numberslayout = {
'7': (0,0), '8': (0,1), '9': (0,2),
'4': (1,0), '5': (1,1), '6': (1,2),
'1': (2,0), '2': (2,1), '3': (2,2),
'0': (3,1)
}
# dict with operations buttons and corresponding positions (tuples)
self.operationslayout = {
'+': (0,3),
'-': (1,3),
'*': (2,3),
'/': (3,3),
}
self.set_menu()
self.set_minidisplay()
self.set_display()
self.keyboard()
self.root.mainloop()
def set_menu(self):
menubar = Menu(self.root)
self.root.configure(menu=menubar)
# options menu
options_menu = Menu(menubar, tearoff=False)
menubar.add_cascade(menu=options_menu, label='Options')
# themes menu
themes_menu = Menu(options_menu, tearoff=False)
options_menu.add_cascade(menu=themes_menu, label='Themes')
for theme in sorted(themes_list):
themes_menu.add_radiobutton(label=theme, value=theme, variable=self.theme)
# font menu
font_menu = Menu(options_menu, tearoff=False)
options_menu.add_cascade(menu=font_menu, label='Fonts')
for fontname in sorted(self.fontlist):
font_menu.add_radiobutton(label=fontname, value=fontname, variable=self.font)
def apply_theme(self):
print('hello')
def set_minidisplay(self):
labelframe = ttk.Frame(self.root)
labelframe.grid(row=0, column=0, sticky='E', padx=25, pady=10)
self.minidisplay = ttk.Label(labelframe)
self.minidisplay.grid(row=0, column=0)
# create minitext variable
self.minitext = StringVar()
self.minidisplay['textvariable'] = self.minitext
def set_display(self):
displayframe = ttk.Frame(self.root)
displayframe.grid(row=1, column=0, sticky='E', padx=25, pady=10)
self.display = ttk.Label(displayframe)
self.display.grid(row=0, column=0)
self.newinput = True
# create global text variable which will be displayed and updated
self.text = StringVar()
self.display['textvariable'] = self.text
def keyboard(self):
kframe = ttk.Frame(self.root, padding=(3,3,3,3))
kframe.grid(row=2, column=0, sticky='WENS', padx=10, pady=10)
kframe.rowconfigure(list(range(4)), weight=1)
kframe.columnconfigure(list(range(5)), weight=1)
# put horizontal line
separator = ttk.Separator(kframe, orient='horizontal')
separator.place(y=-5, relwidth=1, relheight=1)
# numbers
for n, pos in self.numberslayout.items():
SmartButton(kframe, lambda x = n: self.add_to_display(x), pos, text=n)
# decimal
SmartButton(kframe, self.make_decimal, (3,0), text='.')
# negative
SmartButton(kframe, self.negative, (3,2), text='(-)')
# operations
for symbol, pos in self.operationslayout.items():
SmartButton(kframe, lambda x = symbol: self.operation(x), pos, text=symbol)
# compute
SmartButton(kframe, self.compute, (2,4), span=(2,1), text='=')
# cancel
SmartButton(kframe, self.ac, (0,4), text='AC')
SmartButton(kframe, self.delete, (1,4), text='DEL')
"""
Command functions
"""
def add_to_display(self, char: str):
if self.newinput:
self.text.set('')
current = self.text.get()
self.text.set(current + char)
self.newinput = False
def make_decimal(self):
current = self.text.get()
itemlist = current.split(' ')
if '.' not in itemlist[-1]:
self.text.set(current + '.')
def negative(self):
current = self.text.get()
if current == '':
self.text.set('-')
def operation(self, symbol: str):
current = self.text.get()
self.text.set(current + ' ' + symbol + ' ')
self.newinput = False
def ac(self):
self.minitext.set('')
self.text.set('')
def delete(self):
current = self.text.get()
if current[-1].isnumeric():
current = current[:-1]
else:
while not current[-1].isnumeric():
current = current[:-1]
self.text.set(current)
"""
Functions to evaluate expression
"""
def compute(self) -> None:
expression = self.text.get()
expression = expression.split(' ')
expression = self.convert_to_float(expression)
expression = self.multiply_divide(expression)
if not self.division_error:
result = self.add_subtract(expression)
self.show_result(result)
else:
self.minitext.set('')
self.text.set('error!')
self.newinput = True
def multiply_divide(self, expression: list) -> list:
templist = []
templist.append(expression[0])
for i in range(int((len(expression) - 1)/2)):
main = templist[-1]
block = expression[1+2*i:3+2*i] # takes every pair of two entries after the first element
operand = block[0]
number = block[1]
if operand == '*':
tempres = main * number
templist[-1] = tempres
elif operand == '/':
if number != 0:
tempres = main / number
templist[-1] = tempres
else:
self.division_error = True
pass
else:
templist.append(operand)
templist.append(number)
return templist
def add_subtract(self, expression: list) -> float:
result = expression[0]
for i in range(int((len(expression) - 1)/2)):
block = expression[1+2*i:3+2*i] # takes every pair of two entries after the first element
operand = block[0]
number = block[1]
if operand == '+':
result += number
elif operand == '-':
result -= number
else:
continue
return result
def show_result(self, number: float):
self.minitext.set(self.text.get() + ' ' + '=') # update minidisplay
if number.is_integer():
self.text.set(int(number))
else:
self.text.set(round(number, 5))
def convert_to_float(self, strlist) -> list:
floatlist = []
for x in strlist:
try:
floatlist.append(float(x))
except:
floatlist.append(x)
return floatlist
"""
Functions to evaluate errors
"""
###
"""
Styling functions
"""
def set_font(self, *args):
f = self.font.get()
self.style.configure('TLabel', font=(f, 20))
self.style.configure('TButton', font=(f, 15))
if __name__ == '__main__':
Calculator('calculator')
# for fontname in font.families():
# print(fontname)