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оаав ирыыва
Asked:2020-03-11 03:30:34 +0000 UTC2020-03-11 03:30:34 +0000 UTC

如何使文本小部件单行

  • 772

这是一个示例来源：

import tkinter as Tk
from tkinter import messagebox

root = Tk.Tk()

c = Tk.Canvas(root)
c.place(x=-5,y=-5)

class Element_Text():
    def __init__(self, number_place, url_name):
        self.name = Tk.Text(c, bg="white", font=("Calibri", 10));
        self.name.insert("1.0", str(url_name))
        self.name.place(x=33, y=25 + 25 * number_place, height=20, width=128)
    def del_element(self):
        self.name.destroy()
    def get_val(self):
        return self.name.get("1.0", Tk.END)


element_text_1 = Element_Text(1,"vk.com")
element_text_2 = Element_Text(3,"ok.com")

root.mainloop()

如何使 Text 小部件在小部件结束之前具有最大文本长度，超过限制时抛出错误：

messagebox.showerror("Ошибка!", "Максимальное кол-во символов превышено")

或者做不同的事情。使用不允许您将文本换行到另一行的函数或参数，但该怎么做？！

python

1 个回答

  1. Best Answer

    一个更简单的选择是改用它Entry（Text无需调整小部件的高度）

    from tkinter import messagebox, Entry, Tk, StringVar, END, Canvas

root = Tk()

c = Canvas(root)
c.place(x=-5, y=-5)


class Element_Text():
    def __init__(self, number_place):
        self.name = Entry(c, bg="white", font=("Calibri", 10), width=20)
        self.name.place(x=33, y=25 + 25 * number_place)
        self.name.bind("<KeyPress>", self.a)


    def a(self, event):
        if len(self.name.get()) >= 20:
            self.name.delete(20, END)
            messagebox.showerror("Ошибка!", "Максимальное кол-во символов превышено")


element_text_1 = Element_Text(1)
element_text_2 = Element_Text(3)

root.mainloop()

    或如@insolor 所建议的那样（这本质上是更正确的答案）

    from tkinter import messagebox, Entry, Tk, StringVar, END


def callback(sv):
    if len(e.get()) >= 20:
        e.delete(20, END)
        messagebox.showerror("Ошибка!", "Максимальное кол-во символов превышено")


root = Tk()
sv = StringVar()
sv.trace("w", lambda name, index, mode, sv=sv: callback(sv))
e = Entry(root, textvariable=sv, width=20)
e.pack()
root.mainloop()
    • 1

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