[PyQt] connect and "TypeError: argument 1 of QObject.connect()
has an invalid type"
Jason H
scorp1us at yahoo.com
Mon Oct 19 23:21:57 BST 2009
Easy. Items aren't QObjects.
You need to use QGraphicsObject from Qt 4.6, QGraphicsWidget for 4.5, or make your own proxy for graphics Items.
----- Original Message ----
From: Thierry Leurent <thierry.leurent at asgardian.be>
To: pyqt at riverbankcomputing.com
Sent: Mon, October 19, 2009 5:17:47 PM
Subject: [PyQt] connect and "TypeError: argument 1 of QObject.connect() has an invalid type"
Hello,
I'm working on small application that will display the map of a network.
The main window have a QListWidget and a QGraphicScene. I create a number of
object (hosts) in each main widget. When I select an hosts in the
QGraphicScene, I would like select the host in the QListWidget too.
I try different solution to implement signal but that don't work.
I have this kind of message :
File "./ANetworkMapper.py", line 240, in addItem
self.connect(item, QtCore.SIGNAL("hostSelected"),self.hostSelected)
TypeError: argument 1 of QObject.connect() has an invalid type
Thanks
Thierry
the code
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# testdraw.py
import sys
from PyQt4 import QtCore, QtGui
class MainWindow(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self, parent)
self.setGeometry(300, 300, 1000, 550)
self.setWindowTitle(self.tr("Asgardian.be's Network Mapper"))
self.setupActions()
self.setupMenus()
self.setupFrame()
self.statusbar = self.statusBar()
self.connect(self, QtCore.SIGNAL("messageToStatusbar(QString)"),
self.statusbar, QtCore.SLOT("showMessage(QString)"))
self.emit(QtCore.SIGNAL("messageToStatusbar(QString)"), "On the road again")
self.LoadNetworkMap()
def setupFrame(self):
frame = QtGui.QFrame()
self.networkmap = NetworkMapScene(self)
self.networkmap.setSceneRect(QtCore.QRectF(0, 0, 5000, 5000))
self.hostsList = NodesList()
#QtCore.QObject.connect(a, QtCore.SIGNAL("QtSig()"), pyFunction)
#QtCore.QObject.connect(a, QtCore.SIGNAL("QtSig()"), pyClass.pyMethod)
#QtCore.QObject.connect(a, QtCore.SIGNAL("QtSig()"), QtCore.SLOT("QtSlot()"))
#QtCore.QObject.connect(a, QtCore.SIGNAL("PySig()"), QtCore.SLOT("QtSlot()"))
#QtCore.QObject.connect(a, QtCore.SIGNAL("PySig"), pyFunction)
self.connect(self.hostsList,
QtCore.SIGNAL("itemClicked(QListWidgetItem*)"),self.listItemClicked)
self.connect(self.networkmap,
QtCore.SIGNAL("hostSelected"),self.hostSelected)
layout = QtGui.QHBoxLayout(frame)
layout.addWidget(self.hostsList)
self.view = QtGui.QGraphicsView(self.networkmap)
self.view.setRenderHints(QtGui.QPainter.Antialiasing)
layout.addWidget(self.view)
self.setCentralWidget(frame)
def about(self):
QtGui.QMessageBox.about(self, ("About ANetworkMapper"),
("The <b>Asgerdian.be's Network Mapper</b> is build to
help you to make the map of your network."))
def setupActions(self):
aboutAction = QtGui.QAction("A&bout", self)
aboutAction.setShortcut("Ctrl+B")
self.connect(aboutAction, QtCore.SIGNAL("triggered()"),
self.about)
self.aboutAction = aboutAction
def setupMenus(self):
fileMenu = self.menuBar().addMenu(self.tr("&File"))
exitAction = fileMenu.addAction(self.tr("E&xit"))
exitAction.setShortcut(QtGui.QKeySequence(self.tr("Ctrl+Q")))
self.connect(exitAction, QtCore.SIGNAL("triggered()"), QtGui.qApp,
QtCore.SLOT("quit()"))
self.aboutMenu = self.menuBar().addMenu("&Help")
self.aboutMenu.addAction(self.aboutAction)
def LoadNetworkMap(self):
ServerOne=NetworkHost("ServerOne",["Dell", "PowerEdge1900", "Server",
"Debian", "5.0"] ,200,150,None,self.networkmap)
ServerOne.add2List(self.hostsList)
self.networkmap.addItem(ServerOne)
#self.networkmap(ServerOne, QtCore.SIGNAL("hostSelected"),self.hostSelected)
#ServerOne.setPixmap(str("./images/debian.png"))
ServerTwo=NetworkHost("ServerTwo",["Dell", "PowerEdge2600", "Server",
"RedHat", "5.3"] ,50,100,None,self.networkmap)
ServerTwo.add2List(self.hostsList)
self.networkmap.addItem(ServerTwo)
ServerThree=NetworkHost("ServerThree",["Dell", "PowerEdge2600", "Server",
"Debian", "Sid"] ,100,150,None,self.networkmap)
ServerThree.add2List(self.hostsList)
self.networkmap.addItem(ServerThree)
ServerFour=NetworkHost("ServerFour",["HP", "Proliant", "Server", "Windows",
"2003"] ,50,200,None,self.networkmap)
ServerFour.add2List(self.hostsList)
self.networkmap.addItem(ServerFour)
ServerFive=NetworkHost("ServerFive",["HP", "Proliant", "Server", "Windows",
"2003"] ,1500,2000,None,self.networkmap)
ServerFive.add2List(self.hostsList)
self.networkmap.addItem(ServerFive)
self.view.show()
for networkthostitem in self.networkmap.items():
X=networkthostitem.x()
Y=networkthostitem.y()
print X, " ", Y, " ", networkthostitem.toolTip()
print "\n"
def listItemClicked(self,listItem):
viewHorizontalScrollBar=self.view.horizontalScrollBar()
visibleLeft=viewHorizontalScrollBar.value()
viewVerticalScrollBar=self.view.verticalScrollBar()
visibleTop=viewVerticalScrollBar.value()
viewViewport=self.view.viewport()
viewViewportRect=viewViewport.rect()
viewViewportRectBottomRight=viewViewportRect.bottomRight()
visibleLength=viewViewportRectBottomRight.x()
visibleHeigth=viewViewportRectBottomRight.y()
for networkthostitem in self.networkmap.items():
if (listItem.text() == networkthostitem.getName()):
print " ", networkthostitem.getName(), "\n"
print " ", networkthostitem.isVisible(), "\n"
networkthostitem.setFocus()
networkthostitem.setSelected(True)
if (networkthostitem.x() <= visibleLeft) or (networkthostitem.x() >=
(visibleLeft + visibleLength)) or (networkthostitem.y() <= visibleTop) or
(networkthostitem.y() >= (visibleTop + visibleHeigth)):
networkthostitem.ensureVisible(0,0,200,200)
else:
networkthostitem.setSelected(False )
def hostSelected(self):
print "hostslected\n"
class NodesList(QtGui.QListWidget):
def __init__(self, parent=None):
QtGui.QListWidget.__init__(self, parent)
self.setDragEnabled(True)
self.setViewMode(QtGui.QListView.ListMode)
self.setMovement(QtGui.QListView.Snap)
self.setAcceptDrops(True)
self.setDropIndicatorShown(True)
def setCurrentItem(self,host):
QtGui.QListWidget.setCurrentItem(self,host)
class NetworkHost(QtGui.QGraphicsPixmapItem):
HostName=""
HostProducer=""
HostModel=""
HostType=""
HostOS=""
HostOSVersion=""
X=0
Y=0
PixmapItem=None
ListWidgetItem=None
HostsList=None
def __init__(self, name, hostinformations,x, y, parent=None, scene=None):
QtGui.QGraphicsPixmapItem.__init__(self, parent, scene)
self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, True)
self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, True)
self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
self.HostName=name
self.HostProducer=hostinformations[0]
self.HostModel=hostinformations[1]
self.HostType=hostinformations[2]
self.HostOS=hostinformations[3]
self.HostOSVersion=hostinformations[4]
self.setToolTip(self.HostName)
self.X=x
self.Y=y
self.setPos(x,y)
self.PixmapItem=QtGui.QPixmap()
self.PixmapItem.load(self.choosePixmap(self.HostProducer, self.HostModel,
self.HostType, self.HostOS, self.HostOSVersion))
QtGui.QGraphicsPixmapItem.setPixmap(self,self.PixmapItem)
def x(self):
return self.X
def y(self):
return self.Y
def setPixmap (self,PixmapFile):
self.PixmapItem.load(str(PixmapFile))
QtGui.QGraphicsPixmapItem.setPixmap(self,self.PixmapItem)
def choosePixmap(self, HostProducer, HostModel, HostType, HostOS,
HostOSVersion):
if HostOS=="Debian":
return(str("./images/debian.png"))
elif HostOS=="RedHat":
return(str("./images/redhat.png"))
elif HostOS=="Windows":
return(str("./images/windows.png"))
else:
return(str("./images/qt-logo.png"))
def add2List(self, hostslist):
self.ListWidgetItem=QtGui.QListWidgetItem(self.HostName, hostslist)
def setFocusInList(self, hostsList):
QtGui.QListWidget.setCurrentItem(hostsList,self.ListWidgetItem)
def mousePressEvent(self, mouseEvent):
print "NetworkHost :mousePressEvent\n"
print "--- ", self.getName(),"\n"
self.scene.setListSelectedItem(self.getName())
self.emit(QtCore.SIGNAL("hostSelected"))
#self.emit(SIGNAL("hostSelected"))
#self.emit(QtCore.SIGNAL("hostSelected(QGraphicsPixmapItem*)"), self)
#if (mouseEvent.button() != QtCore.Qt.LeftButton):
# return
QtGui.QGraphicsPixmapItem.mousePressEvent(self, mouseEvent)
def getName(self):
return self.HostName
class NetworkMapScene(QtGui.QGraphicsScene):
InsertItem, InsertLine, InsertText, MoveItem = range(4)
def __init__(self, itemMenu, parent=None):
QtGui.QGraphicsScene.__init__(self, parent)
self.myItemMenu = itemMenu
self.myMode = self.MoveItem
self.line = None
self.textItem = None
self.myItemColor = QtCore.Qt.white
self.myTextColor = QtCore.Qt.black
self.myLineColor = QtCore.Qt.black
self.myFont = QtGui.QFont()
def addItem(self, item):
print "---- ", item, "\n"
print "---- ", item.getName(),"\n"
self.connect(item, QtCore.SIGNAL("hostSelected"),self.hostSelected)
QtGui.QGraphicsScene.addItem (self, item)
def setListSelectedItem(self, itemName):
print "setListSelectedItem ", itemName,"\n"
def mousePressEvent(self, mouseEvent):
print "NetworkMapScene :mousePressEvent\n"
for networkthostitem in self.items():
print ">> ",networkthostitem.getName()," ",networkthostitem.isSelected(),"
",networkthostitem.hasFocus(),"\n"
#if (networkthostitem.isSelected() == True):
#print "-- ",networkthostitem.getName(),"\n"
self.emit(QtCore.SIGNAL("hostSelected"))
#if (mouseEvent.button() != QtCore.Qt.LeftButton):
# return
QtGui.QGraphicsScene.mousePressEvent(self, mouseEvent)
def hostSelected(self):
print "NetworkMapScene :hostSelected\n"
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
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