Python: Tkinter聊天应用程序-我想在消息周围画气泡

import tkinter as tk

class MessageBubble(tk.Canvas):
    def __init__(self, parent, text, from_user=True):
        super().__init__(parent, bg="white", highlightthickness=0)
        self.from_user = from_user

        self.message_text = text
        self.create_widgets()

    def create_widgets(self):
        # 获取文本宽度和高度
        text_width = self.measure_text_width(self.message_text)
        text_height = self.measure_text_height(self.message_text)

        # 根据文本大小调整控件大小
        self.config(width=text_width + 20, height=text_height + 20)

        # 绘制气泡背景
        bubble_color = "lightblue" if self.from_user else "lightgreen"
        self.create_polygon(
            10, 10,
            text_width + 10, 10,
            text_width + 10, text_height + 10,
            10, text_height + 10,
            fill=bubble_color
        )

        # 绘制文本
        self.create_text(15, 15, anchor="nw", text=self.message_text)

    def measure_text_width(self, text):
        # 根据文本内容计算宽度
        return len(text) * 8

    def measure_text_height(self, text):
        # 根据文本内容计算高度
        return 20

# 创建聊天应用程序窗口
window = tk.Tk()

# 添加聊天消息
message1 = MessageBubble(window, "Hello, how are you?")
message1.pack()

message2 = MessageBubble(window, "I'm fine, thank you!")
message2.pack()

# 运行窗口主循环
window.mainloop()