import tkinter as tk
from tkinter import ttk
from tkinter.messagebox import showerror
class TemperatureConverter:
@staticmethod
def fahrenheit_to_celsius(f, format=True):
result = (f - 32) * 5/9
if format:
return f'{f} Fahrenheit = {result:.2f} Celsius'
return result
@staticmethod
def celsius_to_fahrenheit(c, format=True):
result = c * 9/5 + 32
if format:
return f'{c} Celsius = {result:.2f} Fahrenheit'
return result
class ConverterFrame(ttk.Frame):
def __init__(self, container, unit_from, converter):
super().__init__(container)
self.unit_from = unit_from
self.converter = converter
# field options
options = {'padx': 5, 'pady': 0}
# temperature label
self.temperature_label = ttk.Label(self, text=self.unit_from)
self.temperature_label.grid(column=0, row=0, sticky='w', **options)
# temperature entry
self.temperature = tk.StringVar()
self.temperature_entry = ttk.Entry(self, textvariable=self.temperature)
self.temperature_entry.grid(column=1, row=0, sticky='w', **options)
self.temperature_entry.focus()
# button
self.convert_button = ttk.Button(self, text='Convert')
self.convert_button.grid(column=2, row=0, sticky='w', **options)
self.convert_button.configure(command=self.convert)
# result label
self.result_label = ttk.Label(self)
self.result_label.grid(row=1, columnspan=3, **options)
# add padding to the frame and show it
self.grid(column=0, row=0, padx=5, pady=5, sticky="nsew")
def convert(self, event=None):
""" Handle button click event
input_value = float(self.temperature.get())
result = self.converter(input_value)
self.result_label.config(text=result)
except ValueError as error:
showerror(title='Error', message=error)
def reset(self):
self.temperature_entry.delete(0, "end")
self.result_label.text = ''
class ControlFrame(ttk.LabelFrame):
def __init__(self, container):
super().__init__(container)
self['text'] = 'Options'
# radio buttons
self.selected_value = tk.IntVar()
ttk.Radiobutton(
self,
text='F to C',
value=0,
variable=self.selected_value,
command=self.change_frame).grid(column=0, row=0, padx=5, pady=5)
ttk.Radiobutton(
self,
text='C to F',
value=1,
variable=self.selected_value,
command=self.change_frame).grid(column=1, row=0, padx=5, pady=5)
self.grid(column=0, row=1, padx=5, pady=5, sticky='ew')
# initialize frames
self.frames = {}
self.frames[0] = ConverterFrame(
container,
'Fahrenheit',
TemperatureConverter.fahrenheit_to_celsius)
self.frames[1] = ConverterFrame(
container,
'Celsius',
TemperatureConverter.celsius_to_fahrenheit)
self.change_frame()
def change_frame(self):
frame = self.frames[self.selected_value.get()]
frame.reset()
frame.tkraise()
class App(tk.Tk):
def __init__(self):
super().__init__()
self.title('Temperature Converter')
self.geometry('480x240')
self.resizable(False, False)
if __name__ == "__main__":
app = App()
ControlFrame(app)
app.mainloop()
运行结果如下：
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