62 lines
1.9 KiB
Python
62 lines
1.9 KiB
Python
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# -*- coding: utf-8 -*-
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from PyQt4 import QtCore
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from ptime import time
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def proxyConnect(source, signal, slot, delay=0.3):
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"""Connect a signal to a slot with delay. Returns the SignalProxy
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object that was created. Be sure to store this object so it is not
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garbage-collected immediately."""
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sp = SignalProxy(source, signal, delay)
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sp.connect(sp, signal, slot)
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return sp
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class SignalProxy(QtCore.QObject):
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"""Object which collects rapid-fire signals and condenses them
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into a single signal. Used, for example, to prevent a SpinBox
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from generating multiple signals when the mouse wheel is rolled
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over it."""
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def __init__(self, source, signal, delay=0.3):
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QtCore.QObject.__init__(self)
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source.connect(source, signal, self.signal)
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self.delay = delay
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self.waitUntil = 0
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self.args = None
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self.timers = 0
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self.signal = signal
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def setDelay(self, delay):
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self.delay = delay
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def flush(self):
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"""If there is a signal queued up, send it now."""
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if self.args is None:
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return False
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self.emit(self.signal, *self.args)
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self.args = None
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return True
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def signal(self, *args):
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"""Received signal, queue to be forwarded later."""
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self.waitUntil = time() + self.delay
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self.args = args
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self.timers += 1
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QtCore.QTimer.singleShot((self.delay*1000)+1, self.tryEmit)
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def tryEmit(self):
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"""Emit signal if it has been long enougn since receiving the last signal."""
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if self.args is None:
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return False
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self.timers -= 1
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t = time()
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if t >= self.waitUntil:
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return self.flush()
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else:
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if self.timers == 0:
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self.timers += 1
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QtCore.QTimer.singleShot((self.waitUntil - t) * 1000, self.tryEmit)
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return True
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