[solved]QAbstractListModel - update data in table view [linux]

[s_z_p]

How to update/refresh a data when my app is running. Data in ‘file.txt’ is changing, how to display this changes ?
I don’t want to shutdown and restart my app.

@ class StockListModel(QtCore.QAbstractListModel):

    def __init__(self, stockdata = [], parent = None):
        QtCore.QAbstractListModel.__init__(self, parent)            
        self.__stockdata = stockdata            
 
    def rowCount(self, parent):
        return len(self.__stockdata)
 
    def data(self, index, role):        
        if role == QtCore.Qt.DisplayRole:
            row = index.row()
            value = self.__stockdata[row]
 
            return value
 
if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    app.setStyle("plastique")
 
    tableView = QtGui.QTableView()      
    tableView.show()
 
    a = os.popen("cat /home/user/file.txt")
    a = a.read()
    time_variable = QtCore.QString("%s"%a)       # how to refresh when app is running ?
 
    model = StockListModel([time_variable])
 
    tableView.setModel(model)
    sys.exit(app.exec_())

@

[topse]

Reset Model and add repopulate data?

[s_z_p]

Should reset looks like that?, if yes how can I repopulate data?
Code below begins in the line 16.

@def resetItems(self,model):
self.beginResetModel()
self.model = model
self.endResetModel()
@

[topse]

Have you made yourself acquaint with Signals and Slots?

When is your "resetItems" being called? I am not familiar with the Python Implementation of Qt -- maybe you should use "setModel"?

[s_z_p]

I am just a beginner in Qt.
Perhaps instead of "model" I shoud reset "stockdata" (add to the line 6):

@
def resetItems(self,stockdata):
self.beginResetModel()
self.__stockdata = stockdata
self.endResetModel()
@

I took the example from this website:
http://www.nullege.com/codes/show/src@o@m@omg-0.3.1@omg@models@simplelistmodel.py/42/PyQt4.QtCore.QAbstractListModel.beginResetModel/python

[s_z_p]

There is something like " self.dataChanged.emit(index, index, ())" but I haven't found how to use reset and signal together to refresh my view yet.

[s_z_p]

somebody? any idea how?
Is it possible to refresh QAbstractListModel getting data from file at all?

[SGaist]

Hi,

You could use a QFileSystemWatcher so you get the information that the file has been modified and re-read it.

Hope it helps

[s_z_p]

I use QFileSystemWatcher like that:
@
file_check = QtCore.QFileSystemWatcher(['/home/user/file.txt'])
file_check.fileChanged.connect(resetItems)@

"resetItems" looks like that:

@def resetItems(self,stockdata):
self.beginResetModel()
self.stockdata = stockdata
self.endResetModel()@

it looks fine but when I run script I got the error:

TypeError: resetItems() takes exactly 2 arguments (1 given)

Could it be mistake in QFileSystemWatcher syntax?

thx for reply!

[s_z_p]

Or problem is related how I reset model:

@ def resetItems(self):
self.beginResetModel()
self.__stockdata = stockdata
self.endResetModel()@

Error:
AttributeError: 'QString' object has no attribute 'beginResetModel'

[SGaist]

It looks like you are mixing several things here. Why did you change your class base type ?

[s_z_p]

@SGaist what do you mean by changing my class base type?, are you talking about 'stockdata' vs '__stockdata' ?
What I understand, my app is running, 'QWatcher' checks if the source file hasn't been changed if yes it runs 'resetItems'.

[s_z_p]

I checked and QWatcher works fine. Problem is related to function resetItems but I haven't found solution.. any idea?

[SGaist]

@AttributeError: ‘QString’ object has no attribute ‘beginResetModel’@

means that you are trying to call beginResetModel on a QString class, which is wrong.

stockdata and __stockdata don't seem to represent the same thing, you should use more meaningful names for your variables to make your code easier to understand

[s_z_p]

how then resetItems has to look like? in this particular case. thx

[SGaist]

It should be part of your subclass of QAbstractItemModel

[s_z_p]

what you have written means that this is wrong ?

@class StockListModel(QtCore.QAbstractListModel):
def init(self, stockdata = [], parent = None):
QtCore.QAbstractListModel.init(self, parent)
self.stockdata = stockdata

    def getItems(self):
       return stockdata

#resetItems:
def resetItems(self,stockdata):
self.beginResetModel()
self.stockdata = stockdata
self.endResetModel()

    def rowCount(self, parent):
        return len(self.stockdata)
        
    def data(self, index, role):        
        if role == QtCore.Qt.DisplayRole:
            row = index.row()
            value = self.stockdata[row]
            return value
            
    file_check = QtCore.QFileSystemWatcher(['/home/user/Desktop/plik.txt'])
    file_check.fileChanged.connect(resetItems)

if name == 'main':
app = QtGui.QApplication(sys.argv)
app.setStyle("plastique")

    tableView = QtGui.QTableView()      
    tableView.show()
 
    a = os.popen("cat /home/user/Desktop/plik.txt")
    a = a.read()
    time_variable = QtCore.QString("%s"%a)
 
    model = StockListModel([time_variable])
 
    tableView.setModel(model)
    sys.exit(app.exec_())@

and instead of QtCore.QAbstractListModel i should use QtCore.QAbstractItemModel ? or add aditional subclass?

[SGaist]

Shouldn't stockdata be a list ? If so, your connection doesn't make sense

[s_z_p]

Yes it is a list but I didn't paste the whole code. There is only one cell in this code. What do you mean "connection doesn't make sense", which part?

[SGaist]

fileChanged gives you the path of the file that changed, not it's content, so basically you are replacing your list by a string.

Also, why are you using the model/view approach if you only have one entry ?