Tkinter按钮绑定到Enter键立即执行

Question

这些问题的答案：How to pass arguments to a Button command in Tkinter?和{a2}非常感谢。在

但是，当我将按钮绑定到按下Enter键时自动执行，它会立即执行。我的代码是：

from Tkinter import *

import ttk

from timeAttendance_show_DTR_GUI import * 


def employee_toShow(leftFrame,rightFrame):  

        empNumberToShow = '1'
        beginDateToShow = '2014-06-01'
        endDateToShow = '2014-06-31'
        requiredReport='dtr'

        emp = IntVar()  #please don't mind yet other parts as I am still working on them bit by bit.
        ttk.Label(leftFrame, text='Enter Employee Number').pack()
        emp_entry = ttk.Entry(leftFrame, textvariable=emp)
        emp_entry.pack()

        emp_DTR = ttk.Button(leftFrame, text='Calculate', command=lambda: indiv_DTR(rightFrame, empNumberToShow, beginDateToShow, endDateToShow, requiredReport))

        emp_entry.focus()
        emp_DTR.pack()
        root.bind('<Return>', indiv_DTR(rightFrame, empNumberToShow, \
            beginDateToShow, endDateToShow, requiredReport))  # This is where i get the problem


def indiv_DTR(frame, empNumberToShow, beginDateToShow, endDateToShow, requiredReport):

        dtr, absent, frequencyOfLate, frequencyOfUndertime, totalMinutesLate, totalMinutesUndertime, \
            frequencyOfGracePeriod, gracePeriodTotal = initialization(empNumberToShow, beginDateToShow, endDateToShow, requiredReport)

        tree = ttk.Treeview(frame, height=31)
        tree['show'] = 'headings'

        tree["columns"]=('Date', 'Day', 'AmIn', 'AM Out', 'PM In', 'PM Out', 'OT In', 'OT Out', 'Late', 'Early Out', 'Remarks')


        tree.column('Date', width=60)
        tree.column('Day', width=45 )
        tree.column('AmIn', width=50)
        tree.column('AM Out', width=50)
        tree.column('PM In', width=50)
        tree.column('PM Out', width=50)
        tree.column('OT In', width=50)
        tree.column('OT Out', width=50)
        tree.column('Late', width=50)
        tree.column('Early Out', width=65)
        tree.column('Remarks', width = 95)

        tree.heading('Date', text='Date')
        tree.heading("Day", text="Day")
        tree.heading("AmIn", text="AM In")
        tree.heading('AM Out', text='AM Out')
        tree.heading('PM In', text = 'PM In')
        tree.heading('PM Out', text = 'PM Out')
        tree.heading('OT In', text = 'OT In')
        tree.heading('OT Out', text='OT Out')
        tree.heading('Late', text='Late')
        tree.heading('Early Out', text='Early Out')
        tree.heading('Remarks', text='Remarks')

        for i in dtr:
            tree.insert("" , 'end', text= '', \
                values=(i[0],i[1],i[2],i[3],i[4],i[5],i[6],i[7],i[8],i[9], i[10])) 
            tree.pack()

if __name__ == '__main__':

        employee_toShow(leftFrame,rightFrame)
        root.mainloop()

显然，这里只是一个新手（甚至不确定我的代码缩进是否正确）。。。任何帮助都将不胜感激。在

Answer 1

当您为<Return>调用root.bind时，您将把调用indiv_DTR(...)的结果作为参数传递。这相当于：

res = indiv_DTR(rightFrame, empNumberToShow, beginDateToShow, endDateToShow, requiredReport)
root.bind('<Return>', res)

这将使函数已经被执行更清楚。在

要让bind操作真正调用此函数，需要传递方法名。例如：

^{pr2}$

或者，如果需要将某些局部变量捕获为事件处理程序的参数，则可以提供lambda表达式。在

Answer 2

请阅读有关投递minimal code的内容。在

在这种情况下

    root.bind('<Return>', indiv_DTR(rightFrame, empNumberToShow,
              beginDateToShow, endDateToShow, requiredReport))

马上打电话给indiv\u DTR，因为这就是你说要做的！要延迟调用，您需要执行与按钮调用相同的操作：前缀为lambda :。但是，要真正“执行按钮”，这意味着像按下按钮一样调用其回调，您应该使用.invoke方法。在

^{pr2}$

（注意，不要emp_DTR.invoke()）。这样，如果在按钮调用中更改indiv\u DTR参数，则不必记住在bind调用中更改它们。在

第三个选择是首先定义回调

def callback():
    return indiv_DTR(rightFrame, empNumberToShow,
              beginDateToShow, endDateToShow, requiredReport)

然后将callback传递给Button和bind调用。我通常首先定义回调，即使只将它们传递给一个小部件构造函数，除非返回表达式非常短。在