在 Python ToDo-app GUI 中清除文本区域

Question

我已经在 python 中做了一个很酷的小 CLI To-Do 应用程序，现在我正在尝试围绕它构建一个基本的 GUI。主要按钮、字段到位，昨天我已经弄清楚如何将返回字符串从我的 Todo 类重定向到文本区域。 我现在的问题是如何清除文本区域？目前，如果我按下“查看按钮”，它会不断重定向文本而不删除先前的输出。我试图用

创建一个函数

self.text.delete('1.0','end') + 带有字符串输出的函数，但它不起作用。你能给我一些建议吗？提前致谢！

import tkinter as tk
from tkinter import messagebox as mbox
from todo_app import ToDo, arguments
import sys


class ToDoGui:
    def __init__(self, root):
       self.t = ToDo()
       self.root = root
       self.mainframe = tk.Frame(self.root, bg="white")
       self.mainframe.pack(fill=tk.BOTH, expand=True)

       self.build_grid()
       self.build_banner()
       self.build_text_area()
       self.build_buttons()
       sys.stderr = TextRedirector(self.text, "stderr")
       self.entry()


def build_grid(self):
        self.mainframe.columnconfigure(0, weight=1)
        self.mainframe.rowconfigure(0, weight=0)
        self.mainframe.rowconfigure(1, weight=1)
        self.mainframe.rowconfigure(0, weight=0)


def build_banner(self):
    banner = tk.Label(
        self.mainframe,
        bg="orange",
        text="PyKeep",
        fg="green",
        font=('Helvetica', 24)
    )
    banner.grid(
        row=0, column=0,
        sticky='ew',
        padx=10, pady=10
    )

def build_buttons(self):
    buttons_frame = tk.Frame(self.mainframe)
    buttons_frame.grid(row=3, column=0, sticky='nsew',
                                         padx=10, pady=10)
    buttons_frame.columnconfigure(0, weight=1)
    buttons_frame.columnconfigure(1, weight=1)
    buttons_frame.columnconfigure(2, weight=1)
    buttons_frame.columnconfigure(3, weight=1)
    buttons_frame.columnconfigure(4, weight=1)

    self.clear_button = tk.Button(
        buttons_frame,
        text='Clear',
        command=self.text.delete('0.0', tk.END)
    )

    self.view_button= tk.Button(
        buttons_frame,
        text='View list',
        command=self.t.list_view
    )

    self.add_button = tk.Button(
        buttons_frame,
        text='Add task',
        command=None
    )

    self.remove_button = tk.Button(
        buttons_frame,
        text='Remove task',
        command=None
    )

    self.complete_button = tk.Button(
        buttons_frame,
        text='Complete task',
        command=None
    )
    self.clear_button.grid(row=0, column=0, sticky='ew')
    self.view_button.grid(row=0, column=1, sticky='ew')
    self.add_button.grid(row=0, column=2, sticky='ew')
    self.remove_button.grid(row=0, column=3, sticky='ew')
    self.complete_button.grid(row=0, column=4, sticky='ew')

def entry(self):
    entry_field = tk.Entry(self.mainframe, bd=2)
    entry_field.grid(row=1, column=0, sticky='nwse', padx=10, pady=10)
    entry_field.insert(0, 'Enter task OR number of a task')
    entry_field.focus()

def build_text_area(self):
    text_frame = tk.Text(self.mainframe, wrap="word")
    text_frame.grid(row=2, column=0, sticky='nsew',
                                    padx=10, pady=10)

    text_frame.columnconfigure(0, weight=1)
    text_frame.config(state=tk.DISABLED)
    text_frame.tag_configure("stderr", foreground="#b22222")
    self.text = text_frame
    return self.text

class TextRedirector(object):
    def __init__(self, widget, tag="stderr"):
        self.widget = widget
        self.tag = tag

    def write(self, str):
        self.widget.configure(state="normal")
        self.widget.insert("end", str, (self.tag,))
        self.widget.configure(state="disabled")

if __name__ == '__main__':
    root = tk.Tk()
    ToDoGui(root)
    root.mainloop()

Answer 1

您要删除的内容不是Text 的内容。这是你的 Entry 小部件。

def entry(self):
    entry_field = tk.Entry(self.mainframe, bd=2)
    entry_field.grid(row=1, column=0, sticky='nwse', padx=10, pady=10)
    entry_field.insert(0, 'Enter task OR number of a task')
    entry_field.focus()
    self.entry_field= entry_field #make entry widget class' object

#since there is only one row in common Entry, you need to only specify starting index 
self.clear_button = tk.Button(..., command=lambda: self.entry_field.delete(0, tk.END)