学生信息管理系统-修改学生

代码实现

在上一节中的class StudentManagerApp中添加如下方法：

    # 修改学生信息
    def modify_student(self):
        selection = self.tree.selection()
        if not selection:
            messagebox.showwarning("警告", "请选择要修改的学员")
            return

        selected_item = self.tree.item(selection, "values")
        id_, name, age, gender = selected_item

        # 创建一个新的Toplevel窗口
        top = tk.Toplevel(self.root)
        top.title("修改学生")

        # 设置弹窗在主窗口的中间位置
        top.update_idletasks()
        width = 300
        height = 200
        x = (self.root.winfo_width() // 2) - (width // 2) + self.root.winfo_x()
        y = (self.root.winfo_height() // 2) - (height // 2) + self.root.winfo_y()
        top.geometry(f"{width}x{height}+{x}+{y}")

        # 输入框
        tk.Label(top, text="姓名:").grid(row=0, column=0, padx=5, pady=5)
        tk.Label(top, text="年龄:").grid(row=1, column=0, padx=5, pady=5)
        tk.Label(top, text="性别:").grid(row=2, column=0, padx=5, pady=5)

        name_var = tk.StringVar(value=name)
        age_var = tk.IntVar(value=age)
        gender_var = tk.StringVar(value=gender)

        tk.Entry(top, textvariable=name_var).grid(row=0, column=1, padx=5, pady=5)
        tk.Entry(top, textvariable=age_var, validate="key",
                 validatecommand=(top.register(self.validate_age), '%P')).grid(row=1, column=1, padx=5, pady=5)
        tk.Entry(top, textvariable=gender_var).grid(row=2, column=1, padx=5, pady=5)

        # 确定按钮
        def ok():
            if name_var.get() and age_var.get() and gender_var.get():
                new_values = (id_, name_var.get(), age_var.get(), gender_var.get())
                self.tree.item(selection, values=new_values)
                for i, student in enumerate(self.students):
                    if student[0] == id_:
                        self.students[i] = new_values
                        break
                top.destroy()  # 关闭对话框

        tk.Button(top, text="确定", command=ok).grid(row=3, column=0, columnspan=2, pady=10)

添加方法后，需要在“修改学员”按钮上调用此函数

tk.Button(btn_frame, text="修改学员", command=self.modify_student).pack(side=tk.LEFT, padx=(0, 10))