7629bca34d
- converted most old-style signals into new-style for PySide compatibility (beware: API changes) - removed ObjectWorkaround, now just using QGraphicsWidget - performance enhancements, particularly in ROI.getArrayRegion - numerous bugfixes
78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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from PyQt4 import QtCore
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from ptime import time
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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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"""Initialization arguments:
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source - Any QObject that will emit signal, or None if signal is new style
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signal - Output of QtCore.SIGNAL(...), or obj.signal for new style
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delay - Time (in seconds) to wait for signals to stop before emitting (default 0.3s)"""
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QtCore.QObject.__init__(self)
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if source is None:
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signal.connect(self.signalReceived)
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self.signal = QtCore.SIGNAL('signal')
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else:
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source.connect(source, signal, self.signalReceived)
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self.signal = signal
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self.delay = delay
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self.args = None
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self.timer = QtCore.QTimer()
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self.timer.timeout.connect(self.flush)
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self.block = False
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def setDelay(self, delay):
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self.delay = delay
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def signalReceived(self, *args):
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"""Received signal. Cancel previous timer and store args to be forwarded later."""
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if self.block:
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return
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self.args = args
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self.timer.stop()
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self.timer.start((self.delay*1000)+1)
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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 or self.block:
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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 disconnect(self):
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self.block = True
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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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if source is None:
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sp.connect(sp, QtCore.SIGNAL('signal'), slot)
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else:
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sp.connect(sp, signal, slot)
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return sp
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if __name__ == '__main__':
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from PyQt4 import QtGui
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app = QtGui.QApplication([])
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win = QtGui.QMainWindow()
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spin = QtGui.QSpinBox()
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win.setCentralWidget(spin)
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win.show()
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def fn(*args):
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print "Got signal:", args
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proxy = proxyConnect(spin, QtCore.SIGNAL('valueChanged(int)'), fn)
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