def test_signal_connection(qapp):
# Create a signal and attach our listener
sig = Signal(name='my_signal', value=1)
register_signal(sig)
widget = WritableWidget()
listener = widget.channels()[0]
sig_conn = SignalConnection(listener, 'my_signal')
sig_conn.add_listener(listener)
# Check that our widget receives the initial value
qapp.processEvents()
assert widget._write_access
assert widget._connected
assert widget.value == 1
# Check that we can push values back to the signal which in turn causes the
# internal value at the widget to update
widget.send_value_signal[int].emit(2)
qapp.processEvents()
qapp.processEvents() # Must be called twice. Multiple rounds of signals
assert sig.get() == 2
assert widget.value == 2
# Try changing types
qapp.processEvents()
qapp.processEvents() # Must be called twice. Multiple rounds of signals
sig_conn.remove_listener(listener)
# Check that our signal is disconnected completely and maintains the same
# value as the signal updates in the background
sig.put(3)
qapp.processEvents()
assert widget.value == 2
widget.send_value_signal.emit(1)
qapp.processEvents()
assert sig.get() == 3
def test_signal_connection(qapp, qtbot):
# Create a signal and attach our listener
sig = Signal(name='my_signal', value=1)
register_signal(sig)
widget = PyDMLineEdit()
qtbot.addWidget(widget)
widget.channel = 'sig://my_signal'
listener = widget.channels()[0]
# If PyDMChannel can not connect, we need to connect it ourselves
# In PyDM > 1.5.0 this will not be neccesary as the widget will be
# connected after we set the channel name
if not hasattr(listener, 'connect'):
pydm.utilities.establish_widget_connections(widget)
# Check that our widget receives the initial value
qapp.processEvents()
assert widget._write_access
assert widget._connected
assert widget.value == 1
# Check that we can push values back to the signal which in turn causes the
# internal value at the widget to update
widget.send_value_signal[int].emit(2)
qapp.processEvents()
qapp.processEvents() # Must be called twice. Multiple rounds of signals
assert sig.get() == 2
assert widget.value == 2
# Try changing types
qapp.processEvents()
qapp.processEvents() # Must be called twice. Multiple rounds of signals
# In PyDM > 1.5.0 we will not need the application to disconnect the
# widget, but until then we have to check for the attribute
if hasattr(listener, 'disconnect'):
listener.disconnect()
else:
qapp.close_widget_connections(widget)
# Check that our signal is disconnected completely and maintains the same
# value as the signal updates in the background
sig.put(3)
qapp.processEvents()
assert widget.value == 2
widget.send_value_signal.emit(1)
qapp.processEvents()
assert sig.get() == 3
def sim_signal():
sim_sig = Signal(name='tst_this_2')
sim_sig.put(3.14)
register_signal(sim_sig)
return sim_sig
