Question

我真的不知道怎么做按钮绑定，因为我之前从未尝试过，但我确实有一个按钮绑定代码，我的问题是，我无法将工作按钮绑定代码合并到我的计算器代码中它使用一个类。我需要做些什么来完成这项工作？

这是我有的按钮绑定代码：

  { 'choices' : [{'Form_id' : 11065,'Fields' : [{'ReflectionField_id' : 283860}],'Name' : 'B'}] }

这是我的实际计算器代码：

from functools import partial
from tkinter import *

root = Tk()

def key(event):
    print ("pressed", repr(event.char))
    if event.char.isdigit():
        append_digit(event.char)
    elif event.char in ('\x08', '\x7f'):
        backspace()

def callback(event):
    frame.focus_set()
    print ("clicked at", event.x, event.y)

frame = Frame(root, width=100, height=100)
frame.bind("<Key>", key)
frame.bind("<Button-1>", callback)
frame.pack()

current = IntVar(0)
label = Label(frame, textvariable=current)
label.pack()

def button_callback(i):
    print ("clicked button {}".format(i))
    append_digit(i)

def append_digit(digit):
    current.set(current.get() * 10 + int(digit))

def backspace():
    current.set(current.get() // 10)

for i in '1234567890':
    Button(frame, text=i, command=partial(button_callback, i)).pack()
Button(frame, text='C', command=backspace).pack()

frame.focus_set()
root.mainloop()

Answer 1

你的按钮绑定（回调）都是正确的。

问题在于您的self.results条目 -

self.results = Entry(display, textvariable=numbers, width=31, fg="snow", bg="snow", font="Verdana")

您已将字体颜色和背景颜色设置为相同颜色，因此即使数字显示在您的计算器中，它们也不可见。将字体颜色（fg）更改为其他内容，例如黑色等 -

self.results = Entry(display, textvariable=numbers, width=31, fg="black", bg="snow", font="Verdana")

对于实际需要，在问题中不清楚，即绑定键盘键。您放置的按钮/操作员绑定脚本的主要部分是 -

frame.bind("<Key>", key)

并且

def key(event):
    print ("pressed", repr(event.char))
    if event.char.isdigit():
        append_digit(event.char)
    elif event.char in ('\x08', '\x7f'):
        backspace()

你可以简单地将它们添加到你的班级（以及其他一些小的改进） -

from tkinter import *
from functools import partial
from tkinter import messagebox
root = Tk()
root.title("Calculator")
root.geometry("317x145")

menubar = Menu(root)

class Calculator(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        master.bind("<Key>", self.key)
        display = Frame(root, bd=0, width=1000, height=1000, relief=SUNKEN)
        buttons = Frame(root, bd=0, width=7, height=1, relief=GROOVE)
        display.grid(column=0, row=0, padx=0, pady=0)
        buttons.grid(column=0, row=1, padx=1)
        numbers = StringVar()
        self.results = Entry(display, textvariable=numbers, width=31, fg="black", bg="snow", font="Verdana")
        self.results.pack()
        self.results.grid(column=0, row=0)

        numbers=["7", "4", "1", "8", "5", "2", "9", "6", "3"]
        for i in range(9):
            n=numbers[i]
            Button(buttons, bg="snow", text=n, width=7, height=1, command=self.show_up(n), relief=RAISED).grid(row=i%3, column=i//3)
        Clear = Button(buttons, bg="snow", text="C", width=7, height=1, command=self.clear, relief=RAISED)
        Clear.grid(padx=2, pady=2, column=3, row=0)
        Equals = Button(buttons, bg="snow", text="=", width=7, height=1, command=self.equals, relief=RAISED)
        Equals.grid(padx=2, pady=2, column=4, row=3)
        All_clear = Button(buttons, bg="snow", text="AC", width=7, height=1, command=self.all_clear, relief=RAISED)
        All_clear.grid(padx=2, pady=2, column=4, row=0)
        Bracket_one = Button(buttons, bg="snow", text="(", width=7, height=1, command=self.bracket_one, relief=RAISED)
        Bracket_one.grid(padx=2, pady=2, column=2, row=3)
        Bracket_two = Button(buttons, bg="snow", text=")", width=7, height=1, command=self.bracket_two, relief=RAISED)
        Bracket_two.grid(padx=2, pady=2, column=3, row=3)
        Zero = Button(buttons, bg="snow", text="0", width=7, height=1, command=self.zero, relief=RAISED)
        Zero.grid(padx=2, pady=2, column=0, row=3)
        Decimal_point = Button(buttons, bg="snow", text=".", width=7, height=1, command=self.decimal_point, relief=RAISED)
        Decimal_point.grid(padx=2, pady=2, column=1, row=3)
        Multiplication = Button(buttons, bg="red", text="x", width=7, height=1, command=self.multiplication, relief=RAISED)
        Multiplication.grid(padx=2, pady=2, column=3, row=1)
        Division = Button(buttons, bg="powder blue", text="/", width=7, height=1, command=self.division, relief=RAISED)
        Division.grid(padx=2, pady=2, column=4, row=1)
        Addition = Button(buttons, bg="yellow", text="+", width=7, height=1, command=self.addition, relief=RAISED)
        Addition.grid(padx=2, pady=2, column=3, row=2)
        Subtraction = Button(buttons, bg="green", text="-", width=7, height=1, command=self.subtraction, relief=RAISED)
        Subtraction.grid(padx=2, pady=2, column=4, row=2)

    def key(self, event):
        if event.char.isdigit():
            self.results.insert(END, event.char)
        elif event.char in ('\x08', '\x7f'):
            self.clear()

    def show_up(self, x):
        return lambda: self.results.insert(END, x)

    def equals(self):
        try:
            result = eval(self.results.get())
        except:
            result = "Error"
        self.all_clear()
        self.results.insert(0, result)
    def zero(self):
        self.results.insert(END, "0")
    def bracket_one(self):
        self.results.insert(END, "(")
    def bracket_two(self):
        self.results.insert(END, ")")
    def all_clear(self):
        self.results.delete(0, END)
    def clear(self):
        self.results.delete(len(self.results.get()) - 1)
    def multiplication(self):
        self.results.insert(END, "*")
    def division(self):
        self.results.insert(END, "/")
    def addition(self):
        self.results.insert(END, "+")
    def subtraction(self):
        self.results.insert(END, "-")
    def decimal_point(self):
        self.results.insert(END, ".")    

if __name__ == '__main__':
    Calculator(root)
    root.config(menu=menubar)
    root.mainloop()

绑定数字和操作员按钮到计算器按钮

1 个答案: