從檢查按鈕檢索屬性 - Tkinter，檢查按鈕，python

Question

我正在嘗試制作一個待辦事項程序。 每個Task都有一些屬性，其中一個是基於某些用戶輸入的值。 當您添加新任務時，有一個選項可以檢查新任務可能與之相關的所有現有任務（例如，新任務可能是洗碗，而現有任務之一是為其購買 soap - 所以它們以某種方式相關）。

如果它澄清了任何事情，這是一張圖片：

假設我檢查了 3 個框/現有任務。 我想檢索與每個選中的任務按鈕關聯的每個值屬性（代碼中的val_var ）。 然后，所有檢查的任務值的總和將成為當前添加的新任務的屬性連接性。

但是，我不確定如何“獲取”已檢查按鈕的所有檢查按鈕值，即使這很可能是一個微不足道的問題。

簡化代碼：

from tkinter import Tk, Frame, Button, Entry, Label, Canvas, OptionMenu, Toplevel, Checkbutton
import tkinter.messagebox 


task_list = []
task_types = ['Sparetime', 'School', 'Work']

class Task:
    def __init__(self, n, h, v,):
        self.name = n
        self.hours = h
        self.value = v
        #self.connectivity = c


def show_tasks():
    task = task_list[-1]

    print('\n')
    print('Value:')
    print(task.value)


def open_add_task():
    taskwin = Toplevel(root)
    taskwin.focus_force()
    
    #Name
    titlelabel = Label(taskwin, text='Title task concisely:', font=('Roboto',11,'bold')).grid(column=1, row=0)
    name_entry = Entry(taskwin, width=40, justify='center')
    name_entry.grid(column=1, row=1)

    #HOURS(required)
    hourlabel = Label(taskwin, text='Whole hours \n required', font=('Roboto',10)).grid(column=1, row=16)
    hour_entry = Entry(taskwin, width=4, justify='center')
    hour_entry.grid(column=1, row=17)

    #CONNECTIVITY
    C_lab = Label(taskwin,text="Check tasks this task is related to").grid(column=1, row=18)
    placement=19
    for task in task_list:
        Checkbutton(taskwin, text=(task.name)).grid(column=1, row=placement, sticky="w")
        placement+=1

    def add_task():
        if name_entry.get() != '': 

            val_var = (int(hour_entry.get())/10)
                
            task_list.append(Task(name_entry.get(), hour_entry.get(), val_var))
            show_tasks()
            listbox_tasks.insert(tkinter.END, name_entry.get())
            name_entry.delete(0, tkinter.END)
            taskwin.destroy()
        else:
            tkinter.messagebox.showwarning(title='Whoops', message='You must enter a task')

        
    Add_button = Button(taskwin, text='Add', font=('Roboto',10), command=add_task).grid(column=2, row=placement, sticky="e")
    placement+=1
    

root = Tk()

task_frame = Frame()
# Create UI
your_tasks_label = Label(root, text='THESE ARE YOUR TASKS:', font=('Roboto',10, 'bold'), justify='center')
your_tasks_label.pack()

listbox_tasks = tkinter.Listbox(root, height=10, width=50, font=('Roboto',10), justify='center')
listbox_tasks.pack()

#BUTTONS
New_Task_Button = Button(root, text='New Task', width=42, command=open_add_task)
New_Task_Button.pack()

root.mainloop()

Answer 1

您可以使用列表來保存 tkinter DoubleVar ，它在每個任務的Checkbutton中使用，其value作為onvalue選項。 然后您可以對DoubleVar列表中的所有值求和以獲得connectivity 。

以下是基於您的代碼的修改示例：

from tkinter import Tk, Frame, Button, Entry, Label, Canvas, OptionMenu, Toplevel, Checkbutton, DoubleVar
import tkinter.messagebox


task_list = []
task_types = ['Sparetime', 'School', 'Work']

class Task:
    def __init__(self, n, h, v, c): # enable the "connectivity"
        self.name = n
        self.hours = h
        self.value = v
        self.connectivity = c

    # added to show the task details
    def __str__(self):
        return f"{self.name}: hours={self.hours}, value={self.value}, connectivity={self.connectivity}"


def show_tasks():
    task = task_list[-1]
    print(task)  # show the task details


def open_add_task():
    taskwin = Toplevel(root)
    taskwin.focus_force()

    #Name
    titlelabel = Label(taskwin, text='Title task concisely:', font=('Roboto',11,'bold')).grid(column=1, row=0)
    name_entry = Entry(taskwin, width=40, justify='center')
    name_entry.grid(column=1, row=1)

    #HOURS(required)
    hourlabel = Label(taskwin, text='Whole hours \n required', font=('Roboto',10)).grid(column=1, row=16)
    hour_entry = Entry(taskwin, width=4, justify='center')
    hour_entry.grid(column=1, row=17)

    #CONNECTIVITY
    C_lab = Label(taskwin,text="Check tasks this task is related to").grid(column=1, row=18)
    placement=19
    vars = [] # list to hold the DoubleVar used by Checkbutton
    for task in task_list:
        # add a DoubleVar to the list
        vars.append(DoubleVar())
        # use the task.value as the "onvalue" option
        Checkbutton(taskwin, text=task.name, variable=vars[-1], onvalue=task.value, offvalue=0).grid(column=1, row=placement, sticky="w")
        placement+=1

    def add_task():
        if name_entry.get() != '':

            val_var = (int(hour_entry.get())/10)
            # calculate the "connectivity" of the new task
            connectivity = sum(v.get() for v in vars)

            task_list.append(Task(name_entry.get(), hour_entry.get(), val_var, connectivity))
            show_tasks()
            listbox_tasks.insert(tkinter.END, name_entry.get())
            name_entry.delete(0, tkinter.END)
            taskwin.destroy()
        else:
            tkinter.messagebox.showwarning(title='Whoops', message='You must enter a task')


    Add_button = Button(taskwin, text='Add', font=('Roboto',10), command=add_task).grid(column=2, row=placement, sticky="e")
    placement+=1


root = Tk()

task_frame = Frame()
# Create UI
your_tasks_label = Label(root, text='THESE ARE YOUR TASKS:', font=('Roboto',10, 'bold'), justify='center')
your_tasks_label.pack()

listbox_tasks = tkinter.Listbox(root, height=10, width=50, font=('Roboto',10), justify='center')
listbox_tasks.pack()

#BUTTONS
New_Task_Button = Button(root, text='New Task', width=42, command=open_add_task)
New_Task_Button.pack()

root.mainloop()