51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
# SPDX-FileCopyrightText: 2020 Jeff Epler for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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# The MIT License (MIT)
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#
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# Copyright (c) 2020 Jeff Epler for Adafruit Industries LLC
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""
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Make a key (button) repeat when held down
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"""
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import time
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class KeyRepeat:
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"""Track the state of a button and, while it is held, output a press every
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'rate' seconds"""
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def __init__(self, getter, rate=0.5):
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self.getter = getter
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self.rate_ns = round(rate * 1e9)
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self.next = -1
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@property
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def value(self):
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"""True when a button is first pressed, or once every 'rate' seconds
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thereafter"""
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state = self.getter()
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if not state:
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self.next = -1
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return False
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now = time.monotonic_ns()
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if state and now > self.next:
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self.next = now + self.rate_ns
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return True
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return False
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