from tkinter import * from functools import partial # To prevent unwanted windows import all_constants as c from datetime import date class Converter: """ Length conversion tool (inches to centimeters or centimeters to inches) """ def __init__(self): """ Length converter GUI """ self.all_calculations_list = ['10.0 inches is 25.4 cm', '20.0 inches is 50.8 cm', '30.0 inches is 76.2 cm', '40.0 inches is 101.6 cm', '50.0 inches is 127.0 cm', 'This is a test'] self.length_frame = Frame(padx=10, pady=10) self.length_frame.grid() self.to_history_button = Button(self.length_frame, text="History/ Info", bg="#CC6600", fg="#FFFFFF", font=("Arial", "14", "bold"), width=12, command=self.to_history) self.to_history_button.grid(row=1, padx=5, pady=5) def to_history(self): """ Opens help dialogue box and disables help button (so that users can't create multiple help boxes). """ HistoryExport(self, self.all_calculations_list) class HistoryExport: """ Displays history dialogue box """ def __init__(self, partner, calculations): self.history_box = Toplevel() # disable help button partner.to_history_button.config(state=DISABLED) # If users press cross at top, closes help and # 'releases' help button self.history_box.protocol('WM_DELETE_WINDOW', partial(self.close_history, partner)) self.history_frame = Frame(self.history_box) self.history_frame.grid() # background colour and text for calculations area if len(calculations) <= c.MAX_CALCS: calc_back = "#D5E804" calc_amount = "all your" else: calc_back = "#ffe6cc" calc_amount = (f"your recent calculations - " f"showing {c.MAX_CALCS} / {len(calculations)}") # strings for 'long' labels... recent_intro_txt = (f"Below are {calc_amount} calculations " "(to the nearest decimal).") # create string from calculations list (newest calculations first) newest_first_string = "" newest_first_list = list(reversed(calculations)) if len(newest_first_list) <= c.MAX_CALCS: for item in newest_first_list: newest_first_string += item + "\n" newest_first_string += newest_first_list[-1] # if we have more than five items... else: for item in newest_first_list[:c.MAX_CALCS-1]: newest_first_string += item + "\n" newest_first_string += newest_first_list[c.MAX_CALCS-1] export_instruction_txt = ("Please push to save your calculations in " "file. If the filename already exists, it will be overwritten") # label list (label text | format | bg) 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) # retrieve export instruction label so that we can # configure it to show the filename if the user exports the file self.export_filename_label = history_label_ref[3] # make frame to hold buttons (two columns) self.hist_button_frame = Frame(self.history_box) self.hist_button_frame.grid(row=4) button_ref_list = [] # button list (button text | bg colour | command | row | column) 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.hist_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): # **** Get current date for heading and filename **** today = date.today() # get day, month, and year as individual strings day = today.strftime("%d") month = today.strftime("%m") year = today.strftime("%Y") file_name = f"lengths_{year}_{month}_{day}" # edit label so users know that their export has been done success_string = ("Export Successful! The file is called " f"{file_name}.txt") self.export_filename_label.config(fg="#009900", text=success_string, font=("Arial", "12", "bold")) # write data to text file write_to = f"{file_name}.txt" with open(write_to, "w") as text_file: text_file.write("***** Length Calculations ******\n") text_file.write(f"Generated: {day}/{month}/{year}\n\n") text_file.write("Here is your calculation history (oldest to newest)...\n") # write the item to file for item in calculations: text_file.write(item) text_file.write("\n") def close_history(self, partner): """ Closes history dialogue box (and enables help button) """ # Put history button back to normal... partner.to_history_button.config(state=NORMAL) self.history_box.destroy() # main routine if __name__ == "__main__": root = Tk() root.title("Length Converter") Converter() root.mainloop()