Python QSignalTransition子类从未接收到自定义PyQt信号
正在尝试学习PyQt5Python QSignalTransition子类从未接收到自定义PyQt信号,python,python-3.x,pyqt,pyqt5,qstatemachine,Python,Python 3.x,Pyqt,Pyqt5,Qstatemachine,正在尝试学习PyQt5QStateMachine,其转换派生自为PySide编写的QSignalTransition。为了使用PyQt,我刚刚更改了信号的定义,以及它在QSignalTransition初始值设定项中的引用方式。这是完整的代码: from PyQt5.QtCore import QObject, pyqtSignal, QSignalTransition, QCoreApplication, QStateMachine, QState, QFinalState class F
QStateMachine
,其转换派生自为PySide编写的QSignalTransition
。为了使用PyQt,我刚刚更改了信号的定义,以及它在QSignalTransition
初始值设定项中的引用方式。这是完整的代码:
from PyQt5.QtCore import QObject, pyqtSignal, QSignalTransition, QCoreApplication, QStateMachine, QState, QFinalState
class Factorial(QObject):
xChanged = pyqtSignal(int)
def __init__(self):
super(Factorial, self).__init__()
self.xval = -1
self.facval = 1
def getX(self):
return self.xval
def setX(self, x):
if self.xval == x:
return
self.xval = x
self.xChanged.emit(x)
x = property(int, getX, setX)
def getFact(self):
return self.facval
def setFact(self, fac):
self.facval = fac
fac = property(int, getFact, setFact)
class FactorialLoopTransition(QSignalTransition):
def __init__(self, fact):
super(FactorialLoopTransition, self).__init__(fact.xChanged[int])
self.fact = fact
def eventTest(self, e):
if not super(FactorialLoopTransition, self).eventTest(e):
return False
return e.arguments()[0] > 1
def onTransition(self, e):
x = e.arguments()[0]
fac = self.fact.fac
self.fact.fac = x * fac
self.fact.x = x - 1
class FactorialDoneTransition(QSignalTransition):
def __init__(self, fact):
super(FactorialDoneTransition, self).__init__(fact.xChanged[int])
self.fact = fact
def eventTest(self, e):
if not super(FactorialDoneTransition, self).eventTest(e):
return False
return e.arguments()[0] <= 1
def onTransition(self, e):
print(self.fact.fac)
if __name__ == '__main__':
import sys
app = QCoreApplication(sys.argv)
factorial = Factorial()
machine = QStateMachine()
compute = QState(machine)
compute.assignProperty(factorial, 'fac', 1)
compute.assignProperty(factorial, 'x', 6)
compute.addTransition(FactorialLoopTransition(factorial))
done = QFinalState(machine)
doneTransition = FactorialDoneTransition(factorial)
doneTransition.setTargetState(done)
compute.addTransition(doneTransition)
machine.setInitialState(compute)
machine.finished.connect(app.quit)
machine.start()
sys.exit(app.exec_())
从PyQt5.QtCore导入QObject、pyqtSignal、QSignalTransition、QCoreApplication、QStateMachine、QState、QFinalState
类阶乘(QObject):
xChanged=pyqtSignal(int)
定义初始化(自):
超级(阶乘,自).\uuuu init\uuuuu()
self.xval=-1
self.facval=1
def getX(自我):
返回self.xval
def setX(自身,x):
如果self.xval==x:
返回
self.xval=x
self.xChanged.emit(x)
x=属性(int、getX、setX)
def getFact(self):
返回自我传真
def setFact(自身、fac):
self.facval=fac
fac=属性(int、getFact、setFact)
类FactorialLoopTransition(QSignalTransition):
定义初始(自我、事实):
super(FactorialLoopTransition,self)。\uuuu init\uuuu(fact.xChanged[int])
事实
def事件测试(自我,e):
如果不是超级(FactorialLoopTransition,self).eventTest(e):
返回错误
返回e.arguments()[0]>1
定义转换(self,e):
x=e.参数()[0]
fac=self.fact.fac
self.fact.fac=x*fac
self.fact.x=x-1
类别FactorialDomainTransition(QSignalTransition):
定义初始(自我、事实):
super(FactorialDoneTransition,self)。\uuuuu init\uuuu(fact.xChanged[int])
事实
def事件测试(自我,e):
如果不是超级(FactorialDoneTransition,self)。事件测试(e):
返回错误
返回e.arguments()[0]该方法需要一个Q_属性,在PySide/PySide2 equals属性的情况下(这与python本机提供的属性不同),在PyQt4/PyQt5的情况下,必须使用该属性,这就是错误的原因,因此解决方案将替换为以下内容:
from PyQt5.QtCore import QObject, pyqtSignal, QSignalTransition, QCoreApplication, QStateMachine, QState, QFinalState, pyqtProperty
class Factorial(QObject):
xChanged = pyqtSignal(int)
def __init__(self):
super(Factorial, self).__init__()
self.xval = -1
self.facval = 1
def getX(self):
return self.xval
def setX(self, x):
if self.xval == x:
return
self.xval = x
self.xChanged.emit(x)
x = pyqtProperty(int, getX, setX) # <---
def getFact(self):
return self.facval
def setFact(self, fac):
self.facval = fac
fac = pyqtProperty(int, getFact, setFact) # <---
# ...
来自PyQt5.QtCore导入QObject、pyqtSignal、QSignalTransition、QCoreApplication、QStateMachine、QState、QFinalState、pyqtProperty
类阶乘(QObject):
xChanged=pyqtSignal(int)
定义初始化(自):
超级(阶乘,自).\uuuu init\uuuuu()
self.xval=-1
self.facval=1
def getX(自我):
返回self.xval
def setX(自身,x):
如果self.xval==x:
返回
self.xval=x
self.xChanged.emit(x)
x=pyqtProperty(int,getX,setX)#感谢您的完美解释,这正是解决方案。我不明白为什么这会导致发送类型不正确的事件。@分钟问题是,如果没有传递正确的值,状态机将启动但从未完成,因此从未发出QStateMachine finished信号,因此也没有调用关闭应用程序的app.quit()。实际上,我发现发送的第一个事件不是SignalEvent
,即使代码是正确的。所以,在修正之前,没有其他事件被发送,因为x的值从未改变。
from PyQt5.QtCore import QObject, pyqtSignal, QSignalTransition, QCoreApplication, QStateMachine, QState, QFinalState, pyqtProperty
class Factorial(QObject):
xChanged = pyqtSignal(int)
def __init__(self):
super(Factorial, self).__init__()
self.xval = -1
self.facval = 1
def getX(self):
return self.xval
def setX(self, x):
if self.xval == x:
return
self.xval = x
self.xChanged.emit(x)
x = pyqtProperty(int, getX, setX) # <---
def getFact(self):
return self.facval
def setFact(self, fac):
self.facval = fac
fac = pyqtProperty(int, getFact, setFact) # <---
# ...