pyqtgraph/SignalProxy.py
2012-03-17 11:48:21 -04:00

101 lines
3.0 KiB
Python

# -*- coding: utf-8 -*-
from Qt import QtCore
from ptime import time
import ThreadsafeTimer
__all__ = ['SignalProxy']
class SignalProxy(QtCore.QObject):
"""Object which collects rapid-fire signals and condenses them
into a single signal. Used, for example, to prevent a SpinBox
from generating multiple signals when the mouse wheel is rolled
over it.
Emits sigDelayed after input signals have stopped for a certain period of time.
"""
sigDelayed = QtCore.Signal(object)
def __init__(self, signal, delay=0.3, slot=None):
"""Initialization arguments:
signal - a bound Signal or pyqtSignal instance
delay - Time (in seconds) to wait for signals to stop before emitting (default 0.3s)
slot - Optional function to connect sigDelayed to.
"""
QtCore.QObject.__init__(self)
signal.connect(self.signalReceived)
self.signal = signal
self.delay = delay
self.args = None
self.timer = ThreadsafeTimer.ThreadsafeTimer()
self.timer.timeout.connect(self.flush)
self.block = False
self.slot = slot
if slot is not None:
self.sigDelayed.connect(slot)
def setDelay(self, delay):
self.delay = delay
def signalReceived(self, *args):
"""Received signal. Cancel previous timer and store args to be forwarded later."""
if self.block:
return
self.args = args
self.timer.stop()
self.timer.start((self.delay*1000)+1)
def flush(self):
"""If there is a signal queued up, send it now."""
if self.args is None or self.block:
return False
#self.emit(self.signal, *self.args)
self.sigDelayed.emit(self.args)
self.args = None
self.timer.stop()
return True
def disconnect(self):
self.block = True
try:
self.signal.disconnect(self.signalReceived)
except:
pass
try:
self.sigDelayed.disconnect(self.slot)
except:
pass
#def proxyConnect(source, signal, slot, delay=0.3):
#"""Connect a signal to a slot with delay. Returns the SignalProxy
#object that was created. Be sure to store this object so it is not
#garbage-collected immediately."""
#sp = SignalProxy(source, signal, delay)
#if source is None:
#sp.connect(sp, QtCore.SIGNAL('signal'), slot)
#else:
#sp.connect(sp, signal, slot)
#return sp
if __name__ == '__main__':
from Qt import QtGui
app = QtGui.QApplication([])
win = QtGui.QMainWindow()
spin = QtGui.QSpinBox()
win.setCentralWidget(spin)
win.show()
def fn(*args):
print "Raw signal:", args
def fn2(*args):
print "Delayed signal:", args
spin.valueChanged.connect(fn)
#proxy = proxyConnect(spin, QtCore.SIGNAL('valueChanged(int)'), fn)
proxy = SignalProxy(spin.valueChanged, delay=0.5, slot=fn2)