如何使文本（一个字母）填写 tkinter 按钮？

Question

我正在尝试完成一个井字游戏。游戏中的每个图块都是一个带有字母“x”或“o”的按钮。但我似乎无法让字母填满框架。当我更改字体大小时，按钮会膨胀。如果我在设置字体大小后尝试设置图块高度/重量，它似乎没有任何效果。

有没有办法简单地将“x”展开以填充它所在的按钮？

class TicTacToeBoard(Frame):
    def __init__(self, parent=None, game=None):
        Frame.__init__(self, parent)
        # We are controlling the gui through an external game class.
        self.game = game
        self.symbol = game.sym()

        mainframe = ttk.Frame(root, padding=(12, 12, 12, 12))
        mainframe.grid(column=0, row=0, sticky=(N, W, E, S))

        # This is how we change the tile a player plays on.
        self.strVars = [StringVar() for x in range(9)]

        # Setup the button tiles 
        self.buttons = []
        for i, s in enumerate(self.strVars):
            func = (lambda i=i: self.btn_press(i))

            b = Button(mainframe, textvariable=s, font='size, 35', command=func)
            b.config(height=5, width=10)
            self.buttons.append(b)

        # Add each tile to the grid
        for x in range(3):
            for y in range(3):
                self.buttons.pop(0).grid(row=x, column=y)

Answer 1

我想说没有办法让字符自动填充整个按钮的空间。考虑Canvas 对象而不是Buttons。在那里，您可以轻松地绘制一个 X（两条线）和一个 O（圆），并完全控制画布边缘和标志之间的大小和空间。让 UI 中的字段成为自己的类也许更有意义。

from functools import partial
from itertools import cycle
import tkinter as tk


class FieldUI(tk.Canvas):

    def __init__(self, parent, size, variable):
        tk.Canvas.__init__(self, parent, width=size, height=size)
        self.size = size
        self.variable = variable
        self.variable.trace('w', self.update_display)
        self.update_display()

    def update_display(self, *_args):
        self.delete(tk.ALL)
        value = self.variable.get()
        if value == 'x':
            self.create_line(5, 5, self.size - 5, self.size - 5, width=4)
            self.create_line(self.size - 5, 5, 5, self.size - 5, width=4)
        elif value == 'o':
            self.create_oval(5, 5, self.size - 5, self.size - 5, width=4)
        elif value != '':
            raise ValueError("only 'x', 'o', and '' allowed")


class GameUI(tk.Frame):

    def __init__(self, parent):
        tk.Frame.__init__(self, parent, background='black')
        self.symbols = cycle('xo')
        self.field_vars = [tk.StringVar() for _ in range(9)]
        for i, field_var in enumerate(self.field_vars):
            field_ui = FieldUI(self, 50, field_var)
            field_ui.bind('<Button-1>', partial(self.on_click, i))
            column, row = divmod(i, 3)
            field_ui.grid(row=row, column=column, padx=1, pady=1)

    def on_click(self, field_index, _event=None):
        field_var = self.field_vars[field_index]
        if not field_var.get():
            field_var.set(next(self.symbols))


def main():
    root = tk.Tk()
    game_ui = GameUI(root)
    game_ui.pack()
    root.mainloop()


if __name__ == '__main__':
    main()