如何使用回调对多个tkinter CheckButton进行更改

#!/usr/bin/env python3 from tkinter import * import tkinter as tk #------------------------------------------------------------------------------- # myCheckButton: CheckButton containing state, that can be identified # in action(command) procedure # Parameters: # userdata: User defined, for example index of a database table row related to the CB # action : command to execute when clicked. Replaces command variable because # command does not provide the event information when called. Event # information is needed to get the checkbox data within action. class myCheckButton(tk.Checkbutton): def __init__(self, parent, userdata, action, *args, **kwargs): # state holds the state of the CB (False = unchecked, True = checked) self.state = BooleanVar(value=False) # add the state variable to tk.Ckeckbutton args kwargs['variable'] = self.state # init tk.Checkbutton super().__init__(parent, *args, **kwargs) # bind action to myCheckButton using <Button-1> (left mouse button) self.bind('<Button-1>', action) # store userdata for usage in the action procedure self.userdata = userdata #------------------------------------------------------------------------------- def onCbClicked(event): # get the calling widget containing all data we need to know sender = event.widget # get the status of CB. "not" because action runs before status change status = not sender.state.get() # do something by using text, status and/or user defined variable if status == True: print("CB(" + sender["text"] + "): Data " + str(sender.userdata) + " is checked") else: print("CB(" + sender["text"] + "): Data " + str(sender.userdata) + " is unchecked") #------------------------------------------------------------------------------- # Main window defs root = tk.Tk() root.title("myCheckButton") root.geometry('300x60') # 1st instance of myCheckButton mycb1 = myCheckButton(root, text="Test A", userdata=1, action=onCbClicked) mycb1.grid(row=0, column=0) # 2nd instance of myCheckButton mycb2 = myCheckButton(root, text="Test B", userdata=2, action=onCbClicked) mycb2.grid(row=1, column=0) # just for example: Set state of mycb2 to true mycb2.state.set(True) root.mainloop()

#!/usr/bin/env python3 from tkinter import * import tkinter as tk #------------------------------------------------------------------------------- # myCheckButton: CheckButton containing state, that can be identified # in action(command) procedure # Parameters: # instName: Name of the CB instance to use in onCbChange # userdata: User defined, for example index of a database table row related to the CB # action : command to execute when status changes. class myCheckButton(tk.Checkbutton): def __init__(self, parent, instName, userdata, action, *args, **kwargs): # state holds the state of the CB (False = unchecked, True = checked) # the name of the internal variable is set to the instance name of this class. self.state = BooleanVar(value=False, name=instName) # Trace the state variable to call action procedure when it changes. self.state.trace("w", action) # add the state variable to tk.Ckeckbutton args kwargs['variable'] = self.state # init tk.Checkbutton super().__init__(parent, *args, **kwargs) # store userdata for usage in the action procedure self.userdata = userdata #------------------------------------------------------------------------------- def onCbChange(*args): # get the calling widget containing all data we need to know from *args. # This requires the name of the traced variable is the same as name of the widget instance. sender = eval(args[0]) # get the status of CB. status = sender.state.get() # do something by using text, status and/or user defined variable if status == True: print("CB(" + sender["text"] + "): Data " + str(sender.userdata) + " is checked") else: print("CB(" + sender["text"] + "): Data " + str(sender.userdata) + " is unchecked") #------------------------------------------------------------------------------- # Main window defs root = tk.Tk() root.title("myCheckButton") root.geometry('300x60') # 1st instance of myCheckButton mycb1 = myCheckButton(root, text="Test A", instName="mycb1", userdata=1, action=onCbChange) mycb1.grid(row=0, column=0) # 2nd instance of myCheckButton mycb2 = myCheckButton(root, text="Test B", instName="mycb2", userdata=2, action=onCbChange) mycb2.grid(row=1, column=0) # just for example: Set state of mycb2 to true mycb2.state.set(True) root.mainloop()

class myCheckButton(tk.Checkbutton): def __init__(self, parent, userdata, action, *args, **kwargs): # state holds the state of the CB (False = unchecked, True = checked) self.state = BooleanVar(value=False) # add the state variable to tk.Ckeckbutton args kwargs['variable'] = self.state # init tk.Checkbutton super().__init__(parent, *args, **kwargs) # bind action to myCheckButton using <Button-1> (left mouse button) self.bind('<Button-1>', action) # store userdata for usage in the action procedure self.userdata = userdata # store action self.action = action # add widget property self.widget = self def set(self, status): # only when status changes: if status != self.state.get(): # callback before status change self.action(self) # change status self.state.set(status)

#!/usr/bin/env python3 from tkinter import * import tkinter as tk #------------------------------------------------------------------------------- # myCheckButton: CheckButton containing state, that can be identified # in action(command) procedure # Parameters: # userdata: User defined, for example index of a database table row related to the CB class myCheckButton(tk.Checkbutton): def __init__(self, parent, userdata, *args, **kwargs): # state holds the state of the CB (False = unchecked, True = checked) self.state = BooleanVar(value=False) # add the state variable to tk.Ckeckbutton args kwargs['variable'] = self.state # init tk.Checkbutton super().__init__(parent, *args, **kwargs) # store userdata for usage in the action procedure self.userdata = userdata def set(self, status): # only when status changes: if status != self.state.get(): if status == True: self.deselect() else: self.select() self.invoke() #------------------------------------------------------------------------------- def onCbClicked(sender): # get the status of CB. status = sender.state.get() # do something by using text, status and/or user defined variable if status == True: print("CB(" + sender["text"] + "): Data " + str(sender.userdata) + " is checked") else: print("CB(" + sender["text"] + "): Data " + str(sender.userdata) + " is unchecked") #------------------------------------------------------------------------------- # Main window defs root = tk.Tk() root.title("myCheckButton") root.geometry('300x60') # 1st instance of myCheckButton mycb1 = myCheckButton(root, text="Test A", userdata=1, command=lambda: onCbClicked(mycb1)) mycb1.grid(row=0, column=0) # 2nd instance of myCheckButton mycb2 = myCheckButton(root, text="Test B", userdata=2, command=lambda: onCbClicked(mycb2)) mycb2.grid(row=1, column=0) # just for example: Set state of mycb2 to test status change callback mycb2.set(True) root.mainloop()

1条回答

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1楼 · 发布于 2024-10-01 07:20:35

我还是有点困惑，但这是你想要的吗：

from tkinter import Tk, Checkbutton


root = Tk()

c = Checkbutton(root, text='Apple')
c.pack()
c.bind('<Button-1>', lambda e: print(e.widget))

root.mainloop()

使用类似的函数模拟用户与复选框的交互（选中用于选择，取消选中用于取消选择）

def check():
    c.deselect()
    c.invoke()
    

def uncheck():
    c.select()
    c.invoke()

你只需要找到一种调用这些函数的方法

完整的代码示例：

from tkinter import Tk, Checkbutton, Button, IntVar


def toggle(widget):
    state = var.get()
    if state == 0:
        print('off')
    if state == 1:
        print('on')
    print(widget)


def check():
    c.deselect()
    c.invoke()


def uncheck():
    c.select()
    c.invoke()


root = Tk()

var = IntVar()

c = Checkbutton(root, text='Apple', variable=var, command=lambda: toggle(c))
c.pack()

Button(root, text='On', command=check).pack()
Button(root, text='Off', command=uncheck).pack()

root.mainloop()

请注意，仅使用.select/.deselect时，使用按钮会触发checkbox命令，但不会这样做

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