如何修改Python Tkinter Entry控件高度实现文本换行避免截断？

问题 #

我有一段能处理任意JSON文件并在GUI中展示键和子键的Python代码，但目前遇到文本内容被截断的问题。我想扩展输入框的高度（2-3行）来完整查看内容，但修改width属性会导致小输入框过度扩展，界面混乱。当前输入框由类似以下代码创建：

globals()[f"dv_{key}_{subkey}"] = tk.Entry(self.root, width=50)

希望修改后输入框支持高度扩展和文本换行，避免内容截断。

附现有代码：

import json
import tkinter as tk

class JsonEditor:
    def __init__(self, root, filename):
        self.root = root
        self.root.title("JSON Editor")
        self.json_data = {}
        self.textboxes = []
        self.filename = filename
        self.read_file()
        self.create_widgets()

    def create_widgets(self):
        # create menu bar
        menubar = tk.Menu(self.root)
        filemenu = tk.Menu(menubar, tearoff=0)
        filemenu.add_command(label="Save", command=self.save_file)
        menubar.add_cascade(label="File", menu=filemenu)
        self.root.config(menu=menubar)

        # create textboxes for JSON keys and values
        row = 0
        for key, value in self.json_data.items():
            if isinstance(value, dict):
                label = tk.Label(self.root, text=key)
                label.grid(row=row, column=0)
                row += 1
                for subkey, subvalue in value.items():
                    sublabel = tk.Label(self.root, text=subkey)
                    sublabel.grid(row=row, column=1)
                    subtextbox = tk.Entry(self.root, width=50)
                    subtextbox.insert(0, subvalue)
                    subtextbox.grid(row=row, column=2)
                    self.textboxes.append((key, subkey, subtextbox))
                    row += 1
            else:
                label = tk.Label(self.root, text=key)
                label.grid(row=row, column=0)
                textbox = tk.Entry(self.root, width=50)
                textbox.insert(0, value)
                textbox.grid(row=row, column=1)
                self.textboxes.append((key, textbox))
                row += 1

        # create submit button
        submit_button = tk.Button(self.root, text="Submit", command=self.save_file)
        submit_button.grid(row=row, column=1)

    def read_file(self):
        with open(self.filename, "r") as f:
            self.json_data = json.load(f)

    def save_file(self):
        for item in self.textboxes:
            if len(item) == 2:
                key, textbox = item
                self.json_data[key] = textbox.get()
            elif len(item) == 3:
                key, subkey, subtextbox = item
                self.json_data[key][subkey] = subtextbox.get()
        with open(self.filename, "w") as f:
            json.dump(self.json_data, f)

root = tk.Tk()

# set the display resolution
root.geometry("800x600")

# set the JSON file path
filename = "C:/orderprepare.json"

# create the editor GUI
editor = JsonEditor(root, filename)

# start the GUI main loop
root.mainloop()

示例JSON文件：

{
    "ShipTo": {
        "CustomerName1": "test test",
        "CustomerName2": "test test",
        "Phone": "000-000-0000dfswerwer",
        "Address1": "test test",
        "Address2": "dfewrwer",
        "City": "Tazewellddsewrer",
        "StateOrProvince": "TNdsfsewr",
        "PostalCode": "82823",
        "Country": "USA"
    },
    "BillTo": {
        "CustomerName1": "test2 test2",
        "CustomerName2": "test2 test2",
        "Address1": "test test",
        "Address2": "dfewrwer",
        "City": "anywhere",
        "StateOrProvince": "TNdsfsewr",
        "PostalCode": "84747",
        "Country": "USA"
    },
    "ItemList": [
        {
            "ItemNumber": "itemxxxx111",
            "BuyerPartNumber": "partxxx1111",
            "Quantity": "7",
            "UnitPrice": "809"
        }
    ]
}

解决方案 #

tkinter的Entry控件是单行输入组件，无法支持多行显示和高度调整，需要替换为Text控件，它支持多行文本、高度设置和自动换行。具体修改步骤如下：

• 替换Entry为Text控件：创建输入框时，用tk.Text代替tk.Entry，设置height参数为2或3，同时开启wrap=tk.WORD实现按单词自动换行，保持width=50避免界面混乱。
• 调整文本插入方式：Text控件的插入方法是insert(tk.END, 内容)，而非Entry的insert(0, 内容)。
• 修改数据读取逻辑：Text控件获取内容用get("1.0", tk.END).strip()，其中"1.0"表示第一行第一个字符，tk.END表示末尾，strip()用于移除自动添加的换行符。

修改后的完整代码：

import json
import tkinter as tk

class JsonEditor:
    def __init__(self, root, filename):
        self.root = root
        self.root.title("JSON Editor")
        self.json_data = {}
        self.textboxes = []
        self.filename = filename
        self.read_file()
        self.create_widgets()

    def create_widgets(self):
        # 创建菜单栏
        menubar = tk.Menu(self.root)
        filemenu = tk.Menu(menubar, tearoff=0)
        filemenu.add_command(label="Save", command=self.save_file)
        menubar.add_cascade(label="File", menu=filemenu)
        self.root.config(menu=menubar)

        # 创建JSON键值对应的文本框
        row = 0
        for key, value in self.json_data.items():
            if isinstance(value, dict):
                label = tk.Label(self.root, text=key)
                label.grid(row=row, column=0, sticky="nw")
                row += 1
                for subkey, subvalue in value.items():
                    sublabel = tk.Label(self.root, text=subkey)
                    sublabel.grid(row=row, column=1, sticky="nw")
                    # 替换为Text控件，设置高度2行，按单词换行
                    subtextbox = tk.Text(self.root, width=50, height=2, wrap=tk.WORD)
                    subtextbox.insert(tk.END, subvalue)
                    subtextbox.grid(row=row, column=2, sticky="nsew")
                    self.textboxes.append((key, subkey, subtextbox))
                    row += 1
            else:
                label = tk.Label(self.root, text=key)
                label.grid(row=row, column=0, sticky="nw")
                # 替换为Text控件，设置高度2行，按单词换行
                textbox = tk.Text(self.root, width=50, height=2, wrap=tk.WORD)
                textbox.insert(tk.END, value)
                textbox.grid(row=row, column=1, sticky="nsew")
                self.textboxes.append((key, textbox))
                row += 1

        # 创建提交按钮
        submit_button = tk.Button(self.root, text="Submit", command=self.save_file)
        submit_button.grid(row=row, column=1)

        # 让网格列自动适应窗口宽度（可选优化）
        self.root.grid_columnconfigure(2, weight=1)
        self.root.grid_columnconfigure(1, weight=1)

    def read_file(self):
        with open(self.filename, "r") as f:
            self.json_data = json.load(f)

    def save_file(self):
        for item in self.textboxes:
            if len(item) == 2:
                key, textbox = item
                # 获取Text内容并移除末尾换行符
                self.json_data[key] = textbox.get("1.0", tk.END).strip()
            elif len(item) == 3:
                key, subkey, subtextbox = item
                self.json_data[key][subkey] = subtextbox.get("1.0", tk.END).strip()
        with open(self.filename, "w") as f:
            json.dump(self.json_data, f, indent=4)  # 添加indent让保存的JSON更美观

root = tk.Tk()

# 设置窗口大小
root.geometry("800x600")

# 设置JSON文件路径
filename = "C:/orderprepare.json"

# 创建编辑器GUI
editor = JsonEditor(root, filename)

# 启动GUI主循环
root.mainloop()

额外优化：添加了sticky="nw"让标签和文本框左上角对齐，grid_columnconfigure让列自动适应窗口宽度，保存JSON时添加indent=4保持格式化。

内容的提问来源于stack exchange，提问作者Alex Co