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firestarsdog
29 lines
845 B
Python
29 lines
845 B
Python
"""Reversible reveal progress for the display-only source panel."""
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OPEN_SECONDS = 0.18
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CLOSE_SECONDS = 0.14
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class DrawerMotion:
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def __init__(self):
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self.reset()
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def reset(self) -> None:
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self.progress = 0.0
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self._open = False
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self._start_progress = 0.0
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self._start_time = 0.0
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def update(self, opened: bool, now: float) -> None:
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# Sample the old transition first so a second tap reverses without jumping.
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target = float(self._open)
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if self.progress != target:
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duration = OPEN_SECONDS if self._open else CLOSE_SECONDS
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phase = min(1.0, max(0.0, (now - self._start_time) / duration))
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self.progress = target + (self._start_progress - target) * (1 - phase) ** 4
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if opened != self._open:
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self._open = opened
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self._start_progress = self.progress
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self._start_time = now
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