PySide newbie question

farcat

In QAbstractItemModel documentation is says that you have to emit a dataChanged signal after changes via SetData. How do i do that in python?

Cheers, Lars

raaghuu

In PySide, all signals reside in a seperate class... Ex -
@

This creates a blank window which closes upon mouse-click.

import sys
from PySide import QtGui, QtCore

class Communicate(QtCore.QObject) :
mySignal = QtCore.Signal() #signal made

other signals here

class AClass(QtGui.QWidget) :
def init(self) :
super(AClass, self).init()
self.initUI()

def initUI(self) :
    self.c = Communicate() #create instance of the signals' class
    self.c.mySignal.connect(self.close) #connect the 'mySignal' signal to QWidget's 'close' method

Setting up the window

    self.setGeometry(300,300,290,150)
    self.setWindowTitle('Emit Signal')
    self.show()

def mousePressEvent(self,event) :
    self.c.mySignal.emit() # reimplement 'mousePressEvent' to emit 'mySignal'

Boilerplate required to run the application

def main() :
app = QtGui.QApplication(sys.argv)
ex = AClass()
sys.exit(app.exec_())

if name == 'main' :
main()

@

farcat

Thanks for the quick reply,

i saw similar examples, but where does this dataChanged(index, index) predefined method (function?) fit in?

Cheers, Lars

raaghuu

@
class MyItemModel(QtCore.QAbstractItemModel) :

other code here

def setData(self, index, value[, role = Qt.EditRole]) :

#   code for setting your data

    self.dataChanged.emit(topLeft, bottomRight) //... emit the data changed signal

@
basically the signal is used as a notification when the data changes

[EDIT] - syntax for signal emitting corrected

farcat

I must be missing something; i tried you example as follows:

@
def setData(self, index, value, role):
if index.isValid() and index.column() == 0 and role == QtCore.Qt.EditRole:
index.internalPointer().name = value
self.dataChanged[index, index].emit() #only the one cell changes
@

But i am still getting an error:

Traceback (most recent call last):
File "D:\Documents\Code\Eclipse\workspace\FlowWare_1\design\Models.py", line 84, in setData
self.dataChanged[index, index].emit()
IndexError: Signature dataChanged() not found for signal: dataChanged

What am i missing?

Cheers, Lars

raaghuu

Hey, my bad there...
@self.dataChanged[index, index].emit()@
is wrong... this syntax is for connecting it with a slot( dataChanged[index, index].connect(...) )

change it to
@self.dataChanged.emit(index, index)@
and see if it works

P.S. i might still be a little wrong as i am not quite experienced in PySide and Python yet... still learning...

farcat

Yes, that was it, thanks a lot.

I am still confused, and start on the tutorial again.