问题
How can I get the traced values from a Tkinter Spinbox in the below modified code (https://stackoverflow.com/a/59326732/7681357) into a variable so I can then use it as a timestamp?
I have added the print to get a visual confirmation that the change is actually being traced but when I added
b = tk.Button(text='get', command=App(root).trace_varhour)
b.pack()
just before the root.mainloop() it returned 13 which is the default value and not the traced.
import tkinter as tk
class App(tk.Frame):
def __init__(self, parent):
super().__init__(parent)
self.hourstr = tk.StringVar(self, '13')
self.hour = tk.Spinbox(self, from_=13, to=23, wrap=True, textvariable=self.hourstr, width=2, state='readonly')
self.minstr = tk.StringVar(self, '30')
self.min = tk.Spinbox(self, from_=0, to=59, wrap=True, textvariable=self.minstr, width=2)
self.secstr = tk.StringVar(self, '00')
self.sec = tk.Spinbox(self, from_=0, to=59, wrap=True,textvariable=self.secstr, width=2)
self.last_valueSec = ''
self.last_value = ''
self.last_valuehour = ''
self.hourstr.trace('w', self.trace_varhour)
self.minstr.trace('w', self.trace_var)
self.secstr.trace('w', self.trace_varsec)
self.hour.grid()
self.min.grid(row=0, column=1)
self.sec.grid(row=0, column=2)
def trace_varhour(self, *args):
self.last_valuehour = self.hourstr.get()
print(self.last_valuehour)
return self.last_valuehour
def trace_var(self, *args):
self.last_value = self.minstr.get()
# return self.last_value
def trace_varsec(self, *args):
self.last_valueSec = self.secstr.get()
# return self.last_valueSec
root = tk.Tk()
App(root).pack()
b = tk.Button(text='get', command=App(root).trace_varhour)
b.pack()
root.mainloop()
回答1:
I found the solution to my problem, after a lot of trial and error, for anyone that it might help:
import tkinter as tk
class App(tk.Frame):
def __init__(self, parent):
super().__init__(parent)
self.hourstr = tk.StringVar(self, '13')
self.hour = tk.Spinbox(self, from_=13, to=23, wrap=True, textvariable=self.hourstr, width=2, state='readonly')
self.minstr = tk.StringVar(self, '30')
self.min = tk.Spinbox(self, from_=0, to=59, wrap=True, textvariable=self.minstr, width=2)
self.secstr = tk.StringVar(self, '00')
self.sec = tk.Spinbox(self, from_=0, to=59, wrap=True,textvariable=self.secstr, width=2)
self.last_valueSec = ''
self.last_value = ''
self.last_valuehour = ''
self.hourstr.trace('w', self.trace_varhour)
self.minstr.trace('w', self.trace_var)
self.secstr.trace('w', self.trace_varsec)
self.hour.grid()
self.min.grid(row=0, column=1)
self.sec.grid(row=0, column=2)
def trace_varhour(self, *args):
self.last_valuehour = self.hourstr.get()
def trace_var(self, *args):
self.last_value = self.minstr.get()
def trace_varsec(self, *args):
self.last_valueSec = self.secstr.get()
root = tk.Tk()
app = App(root)
app.pack()
def get_time():
get_time = app.last_valuehour + ":" + app.last_value + ":" + app.last_valueSec
print(get_time)
b = tk.Button(text='get', command=get_time)
b.pack()
root.mainloop()
来源：https://stackoverflow.com/questions/63088681/tkinter-spinbox-how-can-i-get-traced-values-into-a-variable