TkInter keypress, keyrelease events

Question

I understood that the Tk keypress and keyrelease events were supposed only to fire when the key was actually pressed or released?

However with the following simple c

Answer 1

Well, this is a bit late now, but I have a solution that works. It's not great, but it does not require os.system overwriting system settings, which is nice.

Basically, I make a class that records the timing of key presses. I say that a key is down when it has been pressed in the last short amount of time (here, .1ms). To get a press, it is easy enough: if the key is not registered as pressed, trigger the event. For releases, the logic is harder: if there is a suspected release event, set a timer for a short time (here, .1s) and then check to make sure the key is not down.

Once you have validated a press or release, call the on_key_press or on_key_release methods in your code. As for those, just implement them the way you originally wanted them

I know this is not perfect, but I hope it helps!!

Here is the code:

Where you are initializing keypress events:

key_tracker = KeyTracker()
window.bind_all('', key_tracker.report_key_press)
window.bind_all('', key_tracker.report_key_release)
key_tracker.track('space')

Here is my custom KeyTracker class:

class KeyTracker():
    key = ''
    last_press_time = 0
    last_release_time = 0

    def track(self, key):
        self.key = key

    def is_pressed(self):
        return time.time() - self.last_press_time < .1

    def report_key_press(self, event):
        if event.keysym == self.key:
            if not self.is_pressed():
                on_key_press(event)
            self.last_press_time = time.time()

    def report_key_release(self, event):
        if event.keysym == self.key:
            timer = threading.Timer(.1, self.report_key_release_callback, args=[event])
            timer.start()

    def report_key_release_callback(self, event):
        if not self.is_pressed():
            on_key_release(event)
        self.last_release_time = time.time()