将tkinter小部件绑定到包含args的函数-Lambda的使用 [英] Bind a tkinter widget to a function containing args - Use of Lambda

问题描述

有一个列表:

liste_physical_activity.insert(1, pa1)
liste_physical_activity.insert(2, pa2)
liste_physical_activity.bind('<<ListboxSelect>>',  CurSelet_physical_activity)
liste_physical_activity.pack()

链接到以下功能:

def CurSelet_physical_activity(event, window_mother):
     # stuff

即使使用lambda也不起作用:

Even with using lambda it doesn't work:

<<ListboxSelect>>', lambda event, 
window_mother=main_window  CurSelet_physical_activity (event, window_mother))

问题在于main_window是在另一个file.py中创建的，因此他不知道.

The problem is that the main_window has been created in another file.py, so he doesn't know it.

我该如何解决?

编辑引用问题:

main.py

from Energy_Requirement import*
main_window =Tk()
bouton_energy_requirement= Button(main_window, text="Estimation of energy requirement", command=lambda:energy_requirement(main_window))
bouton_energy_requirement.pack()

file1.py

def energy_requirement(window_mother):
    pa1="NRC"
    pa2="Kornfeld"     
    window5=Toplevel(window_mother)
    liste_physical_activity = Listbox(window5,width=80, height=5)
    liste_physical_activity.insert(1, pa1)
    liste_physical_activity.insert(2, pa2)
    liste_physical_activity.bind('<<ListboxSelect>>',  CurSelet_physical_activity)
    liste_physical_activity.pack()

def CurSelet_physical_activity(event):
    global liste_physical_activity
    value=str(liste_physical_activity.get(liste_physical_activity.curselection()))

    if value==pa1:
       ER=1
       label = Label(main_window, text="Energy Requirement (kcal ME/day)")
       label.pack()
       show_ER=StringVar()
       show_ER.set(ER)
       entree_ER = Entry(main_window,textvariable=show_ER,width=30)
       entree_ER.pack()


    if value==pa2:
       ER=2
       label = Label(main_window, text=" Energy Requirement (kcal ME/day)")
       label.pack()
       show_ER=StringVar()
       show_ER.set(ER)
       entree_ER = Entry(main_window,textvariable=show_ER,width=30)
       entree_ER.pack()

推荐答案

energy_requirement正在传递对main_window的引用，因此您要做的就是在绑定中传递该值.这应该起作用:

energy_requirement is being passed a reference to main_window, so all you need to do is pass that value along in the binding. This should work:

def energy_requirement(window_mother):
    ...
    liste_physical_activity.bind('<<ListboxSelect>>',  
        lambda event, mw=window_mother: CurSelet_physical_activity(event, mw))

然后，您需要修改CurSelet_physical_activity以接受此附加参数:

You'll then need to modify CurSelet_physical_activity to accept this additional parameter:

def CurSelet_physical_activity(event, main_window):
    ...

    if value==pa1:
       ER=1
       label = Label(main_window, text="Energy Requirement (kcal ME/day)")
       ...

看起来您在CurSelet_physical_activity中的任何地方都不使用event，因此您可以根据需要从绑定和函数的参数列表中删除它.

It doesn't look like you use event anywhere in CurSelet_physical_activity, so you can remove that from the binding and from the parameter list of the function if you want.

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