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

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  • S Offline
    S Offline
    s_z_p
    wrote on last edited by
    #3

    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()
    @

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    • T Offline
      T Offline
      topse
      wrote on last edited by
      #4

      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"?

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      • S Offline
        S Offline
        s_z_p
        wrote on last edited by
        #5

        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

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        • S Offline
          S Offline
          s_z_p
          wrote on last edited by
          #6

          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.

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          • S Offline
            S Offline
            s_z_p
            wrote on last edited by
            #7

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

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #8

              Hi,

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

              Hope it helps

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • S Offline
                S Offline
                s_z_p
                wrote on last edited by
                #9

                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!

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                • S Offline
                  S Offline
                  s_z_p
                  wrote on last edited by
                  #10

                  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'

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #11

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

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • S Offline
                      S Offline
                      s_z_p
                      wrote on last edited by
                      #12

                      @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'.

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                      • S Offline
                        S Offline
                        s_z_p
                        wrote on last edited by
                        #13

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

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #14

                          @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

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                          • S Offline
                            S Offline
                            s_z_p
                            wrote on last edited by
                            #15

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

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                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #16

                              It should be part of your subclass of QAbstractItemModel

                              Interested in AI ? www.idiap.ch
                              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                              • S Offline
                                S Offline
                                s_z_p
                                wrote on last edited by
                                #17

                                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?

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                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #18

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

                                  Interested in AI ? www.idiap.ch
                                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                  • S Offline
                                    S Offline
                                    s_z_p
                                    wrote on last edited by
                                    #19

                                    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?

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                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #20

                                      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 ?

                                      Interested in AI ? www.idiap.ch
                                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                      • S Offline
                                        S Offline
                                        s_z_p
                                        wrote on last edited by
                                        #21

                                        Model view approach is needed for let's say full version of the script.

                                        I think I get your point about string. Let me check that.

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                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #22

                                          The signal will just tell you that the file has changed, it will not reload the content for you. You'll have to parse the file again and update stockdata with what you just read from it

                                          Interested in AI ? www.idiap.ch
                                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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