#!/usr/bin/env python3 # MIT License # # Copyright (c) 2022 Eugenio Parodi # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in all # copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. from math import factorial import TermTk as ttk from TermTk.TTkCore.signal import pyTTkSlot # Create a root object (it is a widget that represent the terminal) root = ttk.TTk() # Create a window and attach it to the root (parent=root) calculatorWin = ttk.TTkWindow(parent=root, pos=(1,1), size=(30,17), title="My first Calculator") # Create a grid layout and set it as default for the window winLayout = ttk.TTkGridLayout() calculatorWin.setLayout(winLayout) # Define the Label and attach it to the grid layout at # Position (Row/Col) (0,0) and (Row/Col)Span (1,4) # I force the Max Height to 1 in order to avoid this widget to resize vertically resLabel = ttk.TTkLabel(text="Results", maxHeight=1) winLayout.addWidget(resLabel, 0,0, 1,4) # Define the Numeric Buttons and attach them to the grid layout btn1 = ttk.TTkButton(border=True, text="1") btn2 = ttk.TTkButton(border=True, text="2") btn3 = ttk.TTkButton(border=True, text="3") btn4 = ttk.TTkButton(border=True, text="4") btn5 = ttk.TTkButton(border=True, text="5") btn6 = ttk.TTkButton(border=True, text="6") btn7 = ttk.TTkButton(border=True, text="7") btn8 = ttk.TTkButton(border=True, text="8") btn9 = ttk.TTkButton(border=True, text="9") winLayout.addWidget(btn1, 1,0) # Colspan/Rowspan are defaulted to 1 if not specified winLayout.addWidget(btn2, 1,1) winLayout.addWidget(btn3, 1,2) winLayout.addWidget(btn4, 2,0) winLayout.addWidget(btn5, 2,1) winLayout.addWidget(btn6, 2,2) winLayout.addWidget(btn7, 3,0) winLayout.addWidget(btn8, 3,1) winLayout.addWidget(btn9, 3,2) # Adding the "0" button on the bottom which alignment is # Position (Row/Col) (4,0) (Row/Col)span (1,2) # Just to show off I am using another way to attach it to the grid layout winLayout.addWidget(btn0:=ttk.TTkButton(border=True, text="0"), 4,0, 1,2) # Define the 2 algebraic buttons winLayout.addWidget(btnAdd:=ttk.TTkButton(border=True, text="+"), 1,3) winLayout.addWidget(btnSub:=ttk.TTkButton(border=True, text="-"), 2,3) # The Enter "=" button (2 rows wide) winLayout.addWidget(btnRes:=ttk.TTkButton(border=True, text="="), 3,3, 2,1) # Last but not least an extrabutton just for fun winLayout.addWidget(mysteryButton:=ttk.TTkButton(border=True, text="?"), 4,2) # I am defining a simlpe structure that can be used to store # the mathematical elements of the formulae mathElements = {'a':0, 'b':0, 'operation':None} # This is a simple callback that I can use to store the numbers # I didn't include extra logic because out of the scope of this tutorial def setFactor(value): if mathElements['operation'] is None: mathElements['a'] = mathElements['a']*10+value # Display the value in the label resLabel.setText(f"{mathElements['a']}") else: mathElements['b'] = mathElements['b']*10+value # Display the value in the label resLabel.setText(f"{mathElements['b']}") # I am using a lambda function to redirect the click event to the # proper "setFactor" callback, this is due to the fact that the # "clicked" signal does not return any object or information that # can be used to identify which button has been pressed # different approaches are possible, i.e. create a separate function # for each button btn0.clicked.connect(lambda : setFactor(0)) btn1.clicked.connect(lambda : setFactor(1)) btn2.clicked.connect(lambda : setFactor(2)) btn3.clicked.connect(lambda : setFactor(3)) btn4.clicked.connect(lambda : setFactor(4)) btn5.clicked.connect(lambda : setFactor(5)) btn6.clicked.connect(lambda : setFactor(6)) btn7.clicked.connect(lambda : setFactor(7)) btn8.clicked.connect(lambda : setFactor(8)) btn9.clicked.connect(lambda : setFactor(9)) # Define 2 slots to handle the Add and Sub operations @pyTTkSlot() def setOperationAdd(): mathElements['operation'] = "ADD" @pyTTkSlot() def setOperationSub(): mathElements['operation'] = "SUB" # Connect them to the clicked signal of the buttons btnAdd.clicked.connect(setOperationAdd) btnSub.clicked.connect(setOperationSub) # Same for the "=" button @pyTTkSlot() def executeOperation(): if mathElements['operation'] is not None: if mathElements['operation'] == "ADD": res = mathElements['a'] + mathElements['b'] resLabel.setText(f"{mathElements['a']} + {mathElements['b']} = {res}") else: # "SUB" Routine res = mathElements['a'] - mathElements['b'] resLabel.setText(f"{mathElements['a']} - {mathElements['b']} = {res}") # reset the values mathElements['a'] = res mathElements['b'] = 0 mathElements['operation'] = None btnRes.clicked.connect(executeOperation) @pyTTkSlot() def showAboytWindow(): # I am using the overlay helper to show the # About window on top of the screen # it will be closed once the focus is lost ttk.TTkHelper.overlay(mysteryButton, ttk.TTkAbout(), -2, -1) mysteryButton.clicked.connect(showAboytWindow) # Start the Main loop root.mainloop()