[PySide] QCombobox : Signal not emitted

[Serge K.]

Ok, I see. Thank you really much for this information.

Indeed, I want to add the clicking behavior for selecting an option.
Highlighted was a quick test to see if it was working. I am surprised that
keyboard events are implemented and not mouseEvents.

If I add an eventFilter to my QCombobox for catching MouseButtonRelease
event, how can I get the clicked option? Or Do you have an easier way to do
that Cristian?

self.cb.view().installEventFilter(self)
self.cb.view().viewport().installEventFilter(self)

def eventFilter(self, widget, event):
    if event.type() == QEvent.MouseButtonRelease:
        print("--eventFilter() mouse_clicked on " + str(widget.objectName()))
        my_idx =
        self.cb.setCurrentIndex(my_idx)
        return False
    return False




On Tue, Apr 10, 2018 at 10:33 AM, Cristián Maureira-Fredes <
Cristian.Maureira-Fredes at qt.io> wrote:

> Hello Serge,
>
> I was using my keyboard to navigate the QComboBox options,
> because hovering the options with the mouse just call the
> highlighted slot.
>
> If you want to do something on highlighted, you can add for example the
> following:
>
> def highlighted(self, i):
>     print("Highlighted: ", i)
>     self.cb.setCurrentIndex(i)
>
> In that way, when you move the mouse over the options,
> the  currentIndexChanged signal will be emitted.
>
> I don't know if you want a special behavior on this actions,
> but remember to play around with mouseEvents if you want
> to add clicking behavior.
>
> I'm Running Linux, Python 3.6.4 + PySide2 5.9
>
> Cheers
>
> ________________________________________
> From: Serge K. <skab12 at gmail.com>
> Sent: 10 April 2018 16:11:19
> To: Cristián Maureira-Fredes
> Cc: pyside at qt-project.org
> Subject: Re: [PySide] QCombobox : Signal not emitted
>
> Thanks Cristian,
>
> This is the desired behavior but I do not get this result... That is
> really weird... Can you tell me what is your environment?
>
> Me : windows 10 + anaconda python 3.6.4 + pyside2==5.9.0a1
>
>
> On Apr 10, 2018 3:09 AM, "Cristián Maureira-Fredes" <
> Cristian.Maureira-Fredes at qt.io<mailto:Cristian.Maureira-Fredes at qt.io>>
> wrote:
> Hello Serge,
>
> After executing your script, I get the following output:
> https://pastebin.com/2L3VYR0n
> I do get the output from `selectionchange` and `highlighted`,
> is this not the desire behavior?
>
> Cheers
>
> ________________________________________
> From: PySide <pyside-bounces+cristian.maureira-fredes=qt.io at qt-project.org
> <mailto:qt.io at qt-project.org>> on behalf of Serge K. <skab12 at gmail.com
> <mailto:skab12 at gmail.com>>
> Sent: 09 April 2018 22:46:32
> To: pyside at qt-project.org<mailto:pyside at qt-project.org>
> Subject: [PySide] QCombobox : Signal not emitted
>
>
> Hi Everyone,
>
> After setting a custom model on QCombobox, I do not receive anymore
> currentIndexChanged signal from my QCombobox (look below as an example) Did
> I do something wrong?
>
>
> from PySide2.QtCore import *
> from PySide2.QtGui import *
> from PySide2.QtWidgets import *
>
>
> class CustomModel(QAbstractListModel):
>     """ Protocol model """
>
>     def __init__(self, *args, **kwargs):
>         super(CustomModel, self).__init__(*args, **kwargs)
>
>         self._protocol_list = []
>
>     def add_protocol(self, data, row=0):
>         if not row:
>             row = len(self._protocol_list)
>
>         self.beginInsertRows(QModelIndex(), row, row)
>         self._protocol_list.insert(row, data)
>         self.endInsertRows()
>         return self.index(len(self._protocol_list) - 1)
>
>     def remove_protocol(self, item):
>         for row, data in enumerate(self._protocol_list):
>             if data.name.lower() == item.name.lower():
>                 self.beginRemoveRows(QModelIndex(), row, row)
>                 self._protocol_list.pop(row)
>                 self.endRemoveRows()
>
>     def rowCount(self, parent=QModelIndex()):
>         if parent.isValid():
>             return 0
>         return len(self._protocol_list)
>
>
>     def insertRows(self, row, count, index=QModelIndex()):
>         self.beginInsertRows(QModelIndex(), row, row + count - 1)
>
>         for j in range(row, row + count):
>             self._protocol_list.insert(j, None)
>
>         self.endInsertRows()
>         return True
>
>     def removeRows(self, row, count, index=QModelIndex()):
>         self.beginRemoveRows(QModelIndex(), row, row + count - 1)
>
>         for j in range(row, row + count)[::-1]:
>             self._protocol_list.pop(j)
>
>         self.endRemoveRows()
>         return True
>
>     def headerData(self, section, orientation, role=Qt.EditRole):
>         return None
>
>     def data(self, index, role=Qt.DisplayRole):
>         if not index.isValid():
>             return None
>
>         current_protocol = self._protocol_list[index.row()]
>
>         if role == Qt.DisplayRole or role == Qt.EditRole:
>             return current_protocol[0]
>
>         return None
>
>     def setData(self, index, value, role=Qt.EditRole):
>         if role != Qt.EditRole:
>             return True
>
>         if index.isValid() and 0 <= index.row() < len(self._protocol_list):
>             current_protocol = self._protocol_list[index.row()]
>             if index.column() == 0:
>                 current_protocol[0] =  value
>
>                 self.dataChanged.emit(index, index)
>                 return True
>
>         return False
>
>     def flags(self, index):
>         if index.isValid():
>             return Qt.ItemFlags(Qt.ItemIsEnabled | Qt.ItemIsEditable)
>         return QAbstractListModel.flags(index)
>
>
> class combodemo(QWidget):
>     def __init__(self, parent=None):
>         super(combodemo, self).__init__(parent)
>
>         layout = QHBoxLayout()
>         self.cb = QComboBox()
>         self.model = CustomModel()
>         self.cb.setModel(self.model)
>         self.cb.setModelColumn(0)
>         self.model.add_protocol(("c", "A"))
>         self.model.add_protocol(("c++", "B"))
>         self.model.add_protocol(("Java", "C"))
>         self.model.add_protocol(("C#", "D"))
>         self.model.add_protocol(("Python", "E"))
>
>         self.cb.currentIndexChanged.connect(self.selectionchange)
>         self.cb.highlighted.connect(self.highlighted)
>
>         layout.addWidget(self.cb)
>         self.setLayout(layout)
>         self.setWindowTitle("combo box demo")
>
>     def highlighted(self, i):
>         print("Highlighted: ", i)
>
>     def selectionchange(self, i):
>         print("Items in the list are :")
>
>         for count in range(self.cb.count()):
>             print(self.cb.itemText(count))
>         print("Current index", i, "selection changed ",
> self.cb.currentText())
>
>
>
> def main():
>     app = QApplication(sys.argv)
>     ex = combodemo()
>     ex.show()
>     sys.exit(app.exec_())
>
>
> if __name__ == '__main__':
>     main()
>
>
>
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