Hi,

I have the following code:

Qt Code: 
  1. import sys
  2. from functools import partial
  3. from typing import Optional
  4.  
  5. from PyQt5 import QtCore
  7.     Qt
  10.  
  11.  
  12. class MyModel(QAbstractTableModel):
  13.  
  14.     def __init__(self, parent: Optional[QObject] = None) -> None:
  15.         super().__init__(parent=parent)
  16.  
  17.         self.headers = ['Nummer', 'Name', 'Gemeinde']
  18.         self.data = [
  19.             ('010006', 'Alt Duvenstedt', 'Alt Duvenstedt'),
  20.             ('010010', 'Altenhof', 'Altenhof'),
  21.             ('010012', 'Altwickenbeck (Neuw)', 'Neuwittenbeck'),
  22.             ('010021', 'Bargstedt', 'Bargstedt'),
  23.             ('010023', 'Barkelsby', 'Barkelsby'),
  24.             ('010024', 'Basdorf (Rie)', 'Rieseby'),
  25.         ]
  26.  
  27.     def headerData(self, section: int, orientation: Qt.Orientation, role: int = ...):
  28.         if orientation == Qt.Horizontal and role == Qt.DisplayRole:
  29.             return self.headers[section]
  30.  
  31.     def columnCount(self, parent: QModelIndex = ...) -> int:
  32.         return len(self.headers)
  33.  
  34.     def rowCount(self, parent: QModelIndex = ...) -> int:
  35.         return len(self.data)
  36.  
  37.     def data(self, index: QModelIndex, role: int = ...):
  38.         if role == Qt.DisplayRole:
  39.             return self.data[index.row()][index.column()]
  40.         return QVariant()
  41.  
  42.  
  43. class MyCombobox(QComboBox):
  44.  
  45.     def __init__(self, parent: Optional[QWidget] = None) -> None:
  46.         super().__init__(parent=parent)
  47.  
  48.         self.setFocusPolicy(Qt.StrongFocus)
  49.         # self.setEditable(True)
  50.  
  51.         # self.filterModel = QSortFilterProxyModel(self)
  52.         # self.filterModel.setFilterCaseSensitivity(Qt.CaseInsensitive)
  53.  
  54.         self.tableView = QTableView(self)
  55.         self.setView(self.tableView)
  56.         self.tableView.setSelectionMode(QAbstractItemView.SingleSelection)
  57.         self.tableView.setSelectionBehavior(QAbstractItemView.SelectRows)
  58.         self.tableView.setSortingEnabled(True)
  59.         self.tableView.setAutoScroll(False)
  60.         self.tableView.horizontalHeader().setStretchLastSection(True)
  61.         self.tableView.verticalHeader().hide()
  62.  
  63.         # self.completer = QCompleter(self)
  64.         # self.completer.setCompletionMode(QCompleter.UnfilteredPopupCompletion)
  65.         # self.completer.setPopup(self.tableView)
  66.         # self.completer.setModel(self.filterModel)
  67.         # self.setCompleter(self.completer)
  68.  
  69.         # self.lineEdit().textEdited.connect(self.filterModel.setFilterFixedString)
  70.         # self.completer.activated.connect(self.onCompleterActivated)
  71.  
  72.     def setModel(self, model: QtCore.QAbstractItemModel) -> None:
  73.         super().setModel(model)
  74.         # self.filterModel.setSourceModel(model)
  75.         # self.completer.setModel(self.filterModel)
  76.  
  77.         self.tableView.resizeColumnsToContents()
  78.         self.tableView.resizeRowsToContents()
  79.         self.tableView.setMinimumWidth(self.tableView.horizontalHeader().length())
  80.         self.setMinimumWidth(100)
  81.  
  82.     def setModelColumn(self, column):
  83.         super().setModelColumn(column)
  84.         # self.filterModel.setFilterKeyColumn(column)
  85.         # self.completer.setCompletionColumn(column)
  86.  
  87.     # def onCompleterActivated(self, text):
  88.     #     if text:
  89.     #         index = self.findText(str(text))
  90.     #         self.setCurrentIndex(index)
  91.  
  92.  
  93. def setModelIndex(index: int, target: QComboBox):
  94.     target.blockSignals(True)
  95.     target.setCurrentIndex(index)
  96.     target.blockSignals(False)
  97.  
  98.  
  99. if __name__ == '__main__':
  100.     app = QApplication(sys.argv)
  101.  
  102.     model = MyModel()
  103.     sortModel = QSortFilterProxyModel()
  104.     sortModel.setFilterCaseSensitivity(Qt.CaseInsensitive)
  105.     sortModel.sort(1, Qt.AscendingOrder)
  106.     sortModel.setSourceModel(model)
  107.  
  108.     combobox = MyCombobox()
  109.     combobox.setModel(sortModel)
  110.     combobox.setModelColumn(0)
  111.  
  112.     combobox2 = MyCombobox()
  113.     combobox2.setModel(sortModel)
  114.     combobox2.setModelColumn(1)
  115.  
  116.     combobox.currentIndexChanged.connect(partial(setModelIndex, target=combobox2))
  117.     combobox2.currentIndexChanged.connect(partial(setModelIndex, target=combobox))
  118.  
  119.     widget = QWidget()
  120.     layout = QHBoxLayout()
  121.     layout.addWidget(QLabel('Nummer'))
  122.     layout.addWidget(combobox)
  123.     layout.addWidget(QLabel('Name'))
  124.     layout.addWidget(combobox2)
  125.     layout.addStretch(10)
  126.  
  127.     widget.setWindowTitle('Synchronized comboboxes with shared model')
  128.     widget.setFixedWidth(500)
  129.     widget.setLayout(layout)
  130.     widget.show()
  131.  
  132.     sys.exit(app.exec_())
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I have a model which is shared between two comboboxes.
If I select an entry in one combobox, the other combobox should be updated accordingly.
This works fine when the combobox is not set editable.

As soon as I set it editable (uncommenting the code), I am unable to fill the combobox correctly.

There a several issues I don't understand:

  1. The tableview can not be used twice (I guess I have to duplicate the code and create two instances of a tableview, one for the combobox itself and one for the completer?)
  2. If I select something in the tableview of the combobox, the lineedit is not updated
  3. If I connect the textEdited signal of the lineedit and try to change the index "manually", the changes still are not reflected in the combobox.


I removed all completer code as well and only wanted to have an editable combobox with a tableview, but this does not work as well. Only if I set editable to False I have a working combobox again (selecting something in the tableview will set the index and display the correct text).

What am I doing wrong? I can't figure out what the problem is.

The code above should be a working example with two synched readonly comboboxes.
I just want to add autocompletion / filtering to both of them, because this tableview will contain thousands of items later on.