from tkinter import * from functools import partial # to prevent unwanted windows import all_constants_v2 as c import conversion_rounding_v2 as cr from datetime import date class Converter: """ Distance conversion tool (km to mi or mi to km) """ def __init__(self): """ Distance converter GUI """ self.all_calculations_list = [] self.distant_frame = Frame(padx=10, pady=10) self.distant_frame.grid() self.distant_heading = Label(self.distant_frame, text="Distance Converter", font=("Arial", "16", "bold") ) self.distant_heading.grid(row=0) instructions = ("Please enter a Distance below and then press " "one of the buttons to convert it from Miles to " "Kilometres or Kilometres to Miles.") self.distant_instructions = Label(self.distant_frame, text=instructions, wraplength=250, width=40, justify="left") self.distant_instructions.grid(row=1) self.distant_entry = Entry(self.distant_frame, font=("Arial", "14") ) self.distant_entry.grid(row=2, padx=10, pady=10) error = "Please enter a number" self.answer_error = Label(self.distant_frame, text=error, fg="#084C99", font=("Arial", "14", "bold")) self.answer_error.grid(row=3) # Conversion, help and history / export buttons self.button_frame = Frame(self.distant_frame) self.button_frame.grid(row=4) # button list (button text | bg colour | command | row | column) button_details_list = [ ["To Miles", "#cc2323", lambda: self.check_distant("Miles", c.ABS_ZERO_Kilometres, c.MAX_NUMBER), 0, 0], ["To Kilometres", "#4076a8", lambda: self.check_distant("Kilometres", c.ABS_ZERO_Miles, c.MAX_NUMBER), 0, 1], ["Help / Info", "#d6d2d2", self.to_help, 1, 0], ["History / Export", "#d6d2d2", self.to_history, 1, 1] ] # list to hold buttons once they have been made self.button_ref_list = [] for item in button_details_list: self.make_button = Button(self.button_frame, text=item[0], bg=item[1], fg="#FFFFFF", font=("Arial", "12", "bold"), width=12, command=item[2]) self.make_button.grid(row=item[3], column=item[4], padx=5, pady=5) self.button_ref_list.append(self.make_button) # retrieve to_help button self.to_help_button = self.button_ref_list[2] # retrieve 'history / export' button and disable it at the start self.to_history_button = self.button_ref_list[3] self.to_history_button.config(state=DISABLED) def check_distant(self, unit, min_distant, max_distant): """ Checks Distance is valid and either invokes calculation function or shows a custom error """ # Retrieve Distance to be converted to_convert = self.distant_entry.get() # Reset label and entry box (if we had an error) self.answer_error.config(fg="#004C99", font=("Arial", "13", "bold")) self.distant_entry.config(bg="#FFFFFF") error = f"Enter a number between {min_distant} - {max_distant}" has_errors = "no" # ✅ FIXED: Proper range checking try: to_convert = float(to_convert) if min_distant <= to_convert <= max_distant: self.convert(unit, to_convert) else: has_errors = "yes" except ValueError: has_errors = "yes" # display the error if necessary if has_errors == "yes": self.answer_error.config(text=error, fg="#9C0000", font=("Arial", "10", "bold")) self.distant_entry.config(bg="#F4CCCC") self.distant_entry.delete(0, END) def convert(self, meas_unit, to_convert): # ✅ FIXED: Properly handle each unit type if meas_unit == "Miles": answer = cr.to_miles(to_convert) answer_statement = f"{to_convert}km is {answer}mi" else: # Kilometres answer = cr.to_kilometres(to_convert) answer_statement = f"{to_convert}mi is {answer}km" # Enable history export button as soon as we have a valid calculation self.to_history_button.config(state=NORMAL) # Update the answer_error label with the result self.answer_error.config(text=answer_statement) # Append the calculation to the history list self.all_calculations_list.append(answer_statement) # Print the list of calculations for debugging purposes print(self.all_calculations_list) def to_help(self): DisplayHelp(self) def to_history(self): HistoryExport(self, self.all_calculations_list) class DisplayHelp: def __init__(self, partner): background = "#ffe6cc" self.help_box = Toplevel() partner.to_help_button.config(state=DISABLED) self.help_box.protocol('WM_DELETE_WINDOW', partial(self.close_help, partner)) self.help_frame = Frame(self.help_box, width=300, height=200) self.help_frame.grid() self.help_heading_label = Label(self.help_frame, text="Help / Info", fg="#242424", font=("Arial", "14", "bold")) self.help_heading_label.grid(row=0) help_text = "To use the program, simply enter the Distance " \ "you wish to convert and then choose to convert " \ "to either Miles or Kilometres.\n\n" \ "If you try to convert a Distance that is out of the allowed range, " \ "you will get an error message.\n\n" \ "To see your calculation history and export it to a text file, " \ "please click the 'History / Export' button." self.help_text_label = Label(self.help_frame, text=help_text, wraplength=350, justify="left") self.help_text_label.grid(row=1, padx=10) self.dismiss_button = Button(self.help_frame, font=("Arial", "12", "bold"), text="Dismiss", bg="#CC6600", fg="#FFFFFF", command=partial(self.close_help, partner)) self.dismiss_button.grid(row=2, padx=10, pady=10) for item in [self.help_frame, self.help_heading_label, self.help_text_label]: item.config(bg=background) def close_help(self, partner): partner.to_help_button.config(state=NORMAL) self.help_box.destroy() class HistoryExport: def __init__(self, partner, calculations): self.history_box = Toplevel() partner.to_history_button.config(state=DISABLED) self.history_box.protocol('WM_DELETE_WINDOW', partial(self.close_history, partner)) self.history_frame = Frame(self.history_box) self.history_frame.grid() if len(calculations) <= c.MAX_CALCS: calc_back = "#D5E8D4" calc_amount = "all your" else: calc_back = "#ffe6cc" calc_amount = (f"your recent calculations - " f"showing {c.MAX_CALCS} / {len(calculations)}") recent_intro_txt = (f"Below are {calc_amount} calculations " "(to the nearest Distance).") newest_first_list = list(reversed(calculations)) if len(newest_first_list) <= c.MAX_CALCS: newest_first_string = "\n".join(newest_first_list) else: newest_first_string = "\n".join(newest_first_list[:c.MAX_CALCS]) export_instruction_txt = ("Please push to save your calculations in " "a file. If the filename already exists, it will be replaced.") history_labels_list = [ ["History / Export", ("Arial", "16", "bold"), None], [recent_intro_txt, ("Arial", "11",), None], [newest_first_string, ("Arial", "14"), calc_back], [export_instruction_txt, ("Arial", "11"), None], ] history_label_ref = [] for count, item in enumerate(history_labels_list): make_label = Label(self.history_box, text=item[0], font=item[1], bg=item[2], wraplength=300, justify="left", pady=10, padx=20) make_label.grid(row=count) history_label_ref.append(make_label) self.export_filename_label = history_label_ref[3] self.history_button_frame = Frame(self.history_box) self.history_button_frame.grid(row=4) button_details_list = [ ["Export", "#004C99", lambda: self.export_data(calculations), 0, 0], ["Close", "#666666", partial(self.close_history, partner), 0, 1], ] for btn in button_details_list: self.make_button = Button(self.history_button_frame, font=("Arial", "12", "bold"), text=btn[0], bg=btn[1], fg="#FFFFFF", width=12, command=btn[2]) self.make_button.grid(row=btn[3], column=btn[4], padx=10, pady=10) def export_data(self, calculations): today = date.today() day = today.strftime("%d") month = today.strftime("%m") year = today.strftime("%Y") file_name = f"Distances_{year}_{month}_{day}" success_string = f"Export Successful! The file is called {file_name}.txt" self.export_filename_label.config(bg="#009900", text=success_string, font=("Arial", "12", "bold")) with open(f"{file_name}.txt", "w") as text_file: text_file.write("***** Distance Calculations ******\n") text_file.write(f"Generated: {day}/{month}/{year}\n\n") text_file.write("Here is your calculation history (oldest to newest)...\n") for item in calculations: text_file.write(item + "\n") def close_history(self, partner): partner.to_history_button.config(state=NORMAL) self.history_box.destroy() # main routine if __name__ == "__main__": root = Tk() root.title("Distance Converter") Converter() root.mainloop()