Can I sort a QPainter to be drawn on top on other widgets in PyQt4? - sorting

Question

I'm doing a basic node editor with PyQt4. However I'm stuck with this: The lines linking nodes are drawn behind of the widgets when it should be in the reverse order.
Is there a way to force this or should I restart from scratch and try another approach?
The attacahed code should work and give you 2 nodes that you can move. The line linking them is drawn behind of everything instead of on top.
Thank you
from PyQt4 import QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtCore import Qt
import sys
class Connector():
def __init__(self, name="", id=id, data=None, connected=None, isInput=True, index=-1, parent=None):
self.id = id
self.name = name
self.data = data
self.parent = parent
self.isConnected = not connected
self.connectedTo = connected
self.isInput = isInput
self.index = index
self.width = 16
self.height = 16
self.upperMargin = 30
def getAbsPosition(self):
return QPoint(self.parent.pos().x()+self.getPosition().x(), self.parent.pos().y() + self.getPosition().y())
def getPosition(self):
if self.parent:
if self.isInput:
deltaX = 0 + self.width / 2
else:
deltaX = self.parent.width() - self.width
deltaY = self.upperMargin + (self.index * self.height*2)
pos = QPoint(deltaX, deltaY)
else:
pos = QPoint(0, 0)
return pos
class Node(QLineEdit ):
def __init__(self,parent=None, name=""):
QLineEdit.__init__(self,parent)
self.size = QSize(200, 300)
self.setText(name)
self.resize(self.size.width(), self.size.height())
self.connectors = []
self.createInputConnector()
self.createOutputConnector()
def getConnectors(self):
return self.connectors
def getNewConnectorIndex(self):
indexInputs = 0
indexOutputs = 0
for connector in self.connectors:
if connector.isInput:
indexInputs += 1
else:
indexOutputs += 1
return indexInputs, indexOutputs
def createConnector(self, name, isInput, index):
newConnector = Connector(name=name, isInput=isInput, index=index, parent=self)
self.connectors.append(newConnector)
return newConnector
def createInputConnector(self, name=""):
index, ignore = self.getNewConnectorIndex()
newConnector = self.createConnector(name, isInput=True, index=index)
return newConnector
def createOutputConnector(self, name=""):
ignore, index = self.getNewConnectorIndex()
newConnector = self.createConnector(name, isInput=False, index=index)
return newConnector
def paintEvent(self, event):
painter = QPainter()
painter.begin(self)
painter.path = QPainterPath()
# disabling next line "solves" the problem but not really.
painter.setBrush(QColor(122, 163, 39))
painter.path.addRoundRect(2,2, self.size.width()-6,self.size.height()-6,20,15)
painter.drawPath(painter.path)
for connector in self.connectors:
pos = connector.getPosition()
cx = pos.x()
cy = pos.y()
cw = connector.width
ch = connector.height
painter.drawEllipse(cx, cy, cw, ch)
painter.end()
def mousePressEvent(self, event):
self.__mousePressPos = None
self.__mouseMovePos = None
if event.button() == Qt.LeftButton:
self.__mousePressPos = event.globalPos()
self.__mouseMovePos = event.globalPos()
super(Node, self).mousePressEvent(event)
def mouseMoveEvent(self, event):
if event.buttons() == Qt.LeftButton:
currPos = self.mapToGlobal(self.pos())
globalPos = event.globalPos()
diff = globalPos - self.__mouseMovePos
newPos = self.mapFromGlobal(currPos + diff)
self.move(newPos)
self.__mouseMovePos = globalPos
super(Node, self).mouseMoveEvent(event)
def mouseReleaseEvent(self, event):
if self.__mousePressPos is not None:
moved = event.globalPos() - self.__mousePressPos
if moved.manhattanLength() > 3:
event.ignore()
return
super(Node, self).mouseReleaseEvent(event)
class Window(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self.resize(640,480)
self.entry1 = Node(self, "NODE1")
self.entry2 = Node(self, "NODE2")
def paintEvent(self, e):
qp = QtGui.QPainter()
qp.begin(self)
qp.setClipping(False)
self.doDrawing(qp)
qp.end()
self.update()
def doDrawing(self, qp):
p1 = self.entry1.getConnectors()[0].getAbsPosition()
p2 = self.entry2.getConnectors()[0].getAbsPosition()
qp.drawLine(p1.x(),p1.y(), p2.x(), p2.y())
if __name__=="__main__":
app=QApplication(sys.argv)
win=Window()
win.show()
sys.exit(app.exec_())