Question

我按下按钮时尝试执行Tkinter ttk按钮方法，这意味着我希望方法在按下按钮时继续执行，在我释放按钮时停止，但我不能相当明白。这是代码。

from tkinter import *
from tkinter import ttk

class stuff (object):

    def __init__(self, master):

        master.title("Grid Master")
        master.frame_1 = ttk.Frame(master)
        master.frame_1.pack()
        master.configure(background = "#FFFFFF")

        self.button = ttk.Button(master, text = 'Press', command = self.callback)
        self.button.pack()

    def callback(self):
        print ("Hello world")


def main():
    root = Tk()
    loop = stuff(root)
    root.mainloop()

if __name__ == '__main__':
    main()

您可以在代码中看到该方法仅打印"Hello world"并且我希望此函数执行并继续，打印Hello world直到我释放按钮。

Answer 1

您可以使用root.after()重复计划作业以执行所需任务。请注意，我已将按钮事件更改为在按下按钮时激活，并在释放按钮时终止“之后”作业。

try:
    from tkinter import *
    from tkinter import ttk
except ImportError:
    # Python 2, probably
    from Tkinter import *
    import ttk

class stuff (object):
    def __init__(self, master):
        self._master = master
        master.title("Grid Master")
        master.frame_1 = ttk.Frame(master)
        master.frame_1.pack()
        master.configure(background = "#FFFFFF")

        self.button = ttk.Button(master, text = 'Press')
        self.button.bind("<Button-1>", self.button_pressed)
        self.button.bind("<ButtonRelease-1>", self.button_released)
        self.button.pack()

        self.hello_world_frequency = 1    # milliseconds 

    def hello_world(self):
        print ("Hello world")
        self._job = self._master.after(self.hello_world_frequency, self.hello_world)

    def button_pressed(self, event):
        print ("Button down")
        self.hello_world()

    def button_released(self, event):
        print ("Button released")
        self._master.after_cancel(self._job)


def main():
    root = Tk()
    loop = stuff(root)
    root.mainloop()

if __name__ == '__main__':
    main()

Answer 2

您可以创建一个自定义的重复ttk按钮类，该类继承自ttk.Button，但添加了基本的重复功能。

试试这个。你可以像

一样使用它

self.button = RepeatButton(master, text='Press', command=self.callback)

您可以设置repeatdelay和repeatinterval参数，默认为300和100。

class RepeatButton(ttk.Button):
    def __init__(self, *args, **kwargs):

        self.callback = kwargs.pop('command', None)
        self.repeatinterval = kwargs.pop('repeatinterval', 100)
        self.repeatdelay = kwargs.pop('repeatdelay', 300)

        ttk.Button.__init__(self, *args, **kwargs)

        if self.callback:
            self.bind('<ButtonPress-1>', self.click)
            self.bind('<ButtonRelease-1>', self.release)

    def click(self, event=None):
        self.callback()
        self.after_id = self.after(self.repeatdelay, self.repeat)

    def repeat(self):
        self.callback()
        self.after_id = self.after(self.repeatinterval, self.repeat)

    def release(self, event=None):
        self.after_cancel(self.after_id)

执行按钮方法

2 个答案: