PyQt5 连接不起作用:在此上下文中无法将项目转换为 PyQt5.QtCore.QObject
PyQt5 connection doesn't work: item cannot be converted to PyQt5.QtCore.QObject in this context
我正在尝试连接来自已创建对象的信号,但出现错误。这是我的代码的简化版本:
class OverviewWindow(QMainWindow):
def __init__(self, projectClusters, users, contributorDict, userLastRevPerProj):
QMainWindow.__init__(self)
# Code....
def createUserNodes(self):
userNodes = {}
nodeSpread = 50
yPos = -400
nodeSpan = nodeSpread + 100
width = (len(self.usersFilt) - 1) * nodeSpan
xPos = 0 - (width / 2)
for user in self.usersFilt:
newItem = NodeItem(xPos, yPos, self.nodeDiameter, user, True)
newItem.nodeDoubleClicked.connect(self.dc)
userNodes[user] = newItem
self.graphicsScene.addItem(newItem)
xPos += nodeSpan
return userNodes
@pyqtSlot(str)
def dc(self, text):
print(text)
class NodeItem(QGraphicsItem):
nodeDoubleClicked = pyqtSignal(str)
def __init__(self, xPos, yPos, diameter, text, isUserNode):
super(NodeItem, self).__init__()
# Code...
def mouseDoubleClickEvent(self, event):
self.nodeDoubleClicked.emit(self.texts)
当尝试 运行 时,它给我这个错误:
line 84, in createUserNodes
newItem.nodeDoubleClicked[str].connect(self.dc)
TypeError: NodeItem cannot be converted to PyQt5.QtCore.QObject in this context
我不知道这意味着什么或如何解决它。
QGraphicsItem
不继承自 QObject
,因此不可能从 QGraphicsItem
的实例发出信号。您可以通过继承 QGraphicsObject
而不是 QGraphicsItem
来解决此问题:http://doc.qt.io/qt-5/qgraphicsobject.html.
我正在尝试连接来自已创建对象的信号,但出现错误。这是我的代码的简化版本:
class OverviewWindow(QMainWindow):
def __init__(self, projectClusters, users, contributorDict, userLastRevPerProj):
QMainWindow.__init__(self)
# Code....
def createUserNodes(self):
userNodes = {}
nodeSpread = 50
yPos = -400
nodeSpan = nodeSpread + 100
width = (len(self.usersFilt) - 1) * nodeSpan
xPos = 0 - (width / 2)
for user in self.usersFilt:
newItem = NodeItem(xPos, yPos, self.nodeDiameter, user, True)
newItem.nodeDoubleClicked.connect(self.dc)
userNodes[user] = newItem
self.graphicsScene.addItem(newItem)
xPos += nodeSpan
return userNodes
@pyqtSlot(str)
def dc(self, text):
print(text)
class NodeItem(QGraphicsItem):
nodeDoubleClicked = pyqtSignal(str)
def __init__(self, xPos, yPos, diameter, text, isUserNode):
super(NodeItem, self).__init__()
# Code...
def mouseDoubleClickEvent(self, event):
self.nodeDoubleClicked.emit(self.texts)
当尝试 运行 时,它给我这个错误:
line 84, in createUserNodes
newItem.nodeDoubleClicked[str].connect(self.dc)
TypeError: NodeItem cannot be converted to PyQt5.QtCore.QObject in this context
我不知道这意味着什么或如何解决它。
QGraphicsItem
不继承自 QObject
,因此不可能从 QGraphicsItem
的实例发出信号。您可以通过继承 QGraphicsObject
而不是 QGraphicsItem
来解决此问题:http://doc.qt.io/qt-5/qgraphicsobject.html.