TKinter ComboBox 变量问题答案

【问题标题】：TKinter ComboBox Variable IssueTKinter ComboBox 变量问题
【发布时间】：2022-10-23 00:38:51
【问题描述】：

我正在尝试使用 tkinter，更具体地说是 customtkinter，来创建一个组合框，并在第一个组合框中有一个变量来确定另一个组合框的选项是什么。我认为语法可能有点不同，因为它是 customtkinter 而不是标准的。看看是否有人可以看看我的代码。

这是该课程的一个片段：

# ---------------- HP Pool Option --------------#
        #HP pool values
        #Low
        hp_low_options = ["Random",
                        "5","10","15","20",
                        "25","30","35","40",
                        "45","50","55","60",
                        "65","70","75","80",
                        "85","90","95","100",
                        ]
        #Medium                
        hp_medium_options = ["Random",
                        "105","110","115","120",
                        "125","130","135","140",
                        "145","150","155","160",
                        "165","170","175","180",
                        "185","190","195","200",
                        ]
        #Large
        hp_high_options = ["Random",
                        "205","210","215","220",
                        "225","230","235","240",
                        "245","250","255","260",
                        "265","270","275","280",
                        "285","290","295","300",
                        ]
        #Extreme
        hp_extreme_options = ["Random",
                        "325","350","375","400",
                        "425","450","475","500",
                        "525","550","575","600",
                        "625","650","675","700",
                        "725","750","775","800",
                        ]

        #Create first combobox for pool type
        hp_pool_label = customtkinter.CTkLabel(master=self.frame_left, text="HP Option")
        hp_pool_label.grid(row=5,column=0)
        current_hp_pool = StringVar() #initialize variable
        hp_pool_combobox = customtkinter.CTkComboBox(master=self.frame_left, 
                                                    variable=current_hp_pool, #set variable in combobox
                                                    values=("Random",
                                                            "Low HP Pool", 
                                                            "Medium HP Pool", 
                                                            "High HP Pool", 
                                                            "Extreme HP Pool"))
        hp_pool_combobox.grid(row=5, column=1)

            #This is where the problems start I think 

            hp_pool_combobox.set("Random")  
            hp_pool_combobox.setvar("Test", current_hp_pool)
            current_hp_pool = hp_pool_combobox.current_value

            if current_hp_pool == "Random":
                hp_pool_selected = (hp_low_options,
                                    hp_medium_options,
                                    hp_high_options,
                                    hp_extreme_options)
            elif current_hp_pool == "Low HP Pool":
                hp_pool_selected = hp_low_options
            elif current_hp_pool == "Medium HP Pool":
                hp_pool_selected = hp_medium_options
            elif current_hp_pool == "High HP Pool":
                hp_pool_selected = hp_high_options
            elif current_hp_pool == "Extreme HP Pool":
                hp_pool_selected = hp_extreme_options
            
            hp_value_combobox = customtkinter.CTkComboBox(master=self.frame_left, values=hp_pool_selected)
            hp_value_combobox.grid(row=5, column=2)
            hp_value_combobox.set("Random")

I think creating an even of some sort is the answer so when the new option is selected the event triggers and changes the second combobox options.感谢您的时间和精力！

【问题讨论】：

GUI 不像 input() 那样工作 - 小部件不会等待您的选择，但它们只会通知 mainloop 它必须在窗口中显示的内容。 mainloop 之前的所有代码都会在你看到窗口之前执行。当您更改选项时，您必须分配将运行功能的事件 - 此功能应更新其他小部件。
如果你使用StringVar()、IntVar() 等，那么你必须使用.get() 来获得价值——即。 if current_hp_pool.get() == "Random":
当您在Combobox github.com/TomSchimansky/CustomTkinter/wiki/CTkComboBox 中选择某些内容时，似乎这个Combobox 有comman=function_name（如Button）运行function_name()

标签： python tkinter combobox customtkinter

【解决方案1】：

一种方法是设置CTkCombobox 的command 选项，并根据回调内第一个组合框的选定值更新第二个组合框。

下面是一个例子：

import customtkinter as ctk

options = {
    'Low': ('5', '10'),
    'Medium': ('15', '20'),
    'High': ('25', '30'),
    'Extreme': ('35', '40')
}

def on_combo1_selected(value):
    values = ('Random',)
    if value == 'Random':
        for v in options.values():
            values += v
    else:
        values += options[value]
    combo2.configure(values=values)
    combo2.set('')

root = ctk.CTk()

var1 = ctk.StringVar()
combo1 = ctk.CTkComboBox(root, variable=var1, values=('Random',)+tuple(options.keys()), command=on_combo1_selected)
combo1.pack()

var2 = ctk.StringVar()
combo2 = ctk.CTkComboBox(root, variable=var2)
combo2.pack()

root.mainloop()

您可以将逻辑应用于您的代码。

【讨论】：