[PySide] QListView - make tab key behave like enter key

[Cristián Maureira-Fredes]

Hello Frank,

You can try to use an event filter to intercept the key press events.
https://doc.qt.io/qt-5/qobject.html#installEventFilter

Other option could be to re-implement the keyPressedEvent
https://doc.qt.io/qt-5/qlineedit.html#keyPressEvent

Cheers

________________________________________
From: PySide <pyside-bounces at qt-project.org> on behalf of Frank Rueter | OHUfx <frank at ohufx.com>
Sent: Tuesday, March 19, 2019 06:35
To: pyside at qt-project.org; interest at qt-project.org
Subject: [PySide] QListView - make tab key behave like enter key

Hi all,

I have a simple QListView in which I would like to edit items by clicking into empty space, typing, then hitting either enter or tab.
I’d like the tab Key_Tab event to behave exactly like Key_Enter event, but it’s a bit stubborn.
When I hit tab while editing an item (i.e. editor is open), the first item in the list is selected.

I noticed that when hitting the tab key in an open editor only a QtCore.QEvent.ShortcutOverride is triggered.
It looks like I can simply react to that in my situation though I’m not sure if that is wise?!
If I do, how would I manually emit an event that looks like a Key_Enter event?

Otherwise, how can I avoid above behaviour for the tab key and make it behave like a regular key (I assume it’s trying to change focus in the focus chain but don’t know how to make it stop)?

Here is some example code to show my problem.

Cheers,
frank

class AddresseeDelegate(QtWidgets.QItemDelegate):
    is_valid = QtCore.Signal()
    is_not_valid = QtCore.Signal(QtCore.QModelIndex)

    def __init__(self, users=[], groups=[], parent=None):
        super(AddresseeDelegate, self).__init__(parent)
        self.valid_item_texts = [u['name'] for u in users] + [g['code'] for g in groups]

    def createEditor(self, parent, option, index):
        self.editor = QtWidgets.QLineEdit(parent)
        self.editor.setMinimumWidth(100)
        completer = QtWidgets.QCompleter(self.valid_item_texts)
        completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
        completer.setCompletionMode(QtWidgets.QCompleter.InlineCompletion)
        self.editor.setCompleter(completer)
        self.editor.editingFinished.connect(lambda: self.validate_text(index))
        return self.editor

    def setModelData(self, editor, model, index):
        model.setData(index, editor.text())

    def validate_text(self, index=None):
        if self.editor.text() in self.valid_item_texts:
            # valid input
            self.commitData.emit(self.editor)
            self.closeEditor.emit(self.editor)
            self.is_valid.emit()
        else:
            # invalid input
            self.closeEditor.emit(self.editor)
            self.is_not_valid.emit(index)

class AddresseeListView(QtWidgets.QListView):
    def __init__(self, users=[], groups=[], parent=None):
        '''Simple addressee widget.'''
        super(AddresseeListView, self).__init__(parent)
        self.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers)
        self.setFlow(QtWidgets.QListView.LeftToRight)
        self.setResizeMode(QtWidgets.QListView.ResizeMode.Adjust)
        self.setSpacing(10)
        self.setViewMode(QtWidgets.QListView.IconMode)
        #self.setWrapping(True)

        # delegate
        delegate = AddresseeDelegate(users, groups)
        self.setItemDelegate(delegate)
        delegate.is_not_valid.connect(self.delete_invalid_index)

        # model
        model = QtGui.QStandardItemModel()
        #model = Model()
        self.setModel(model)

    def event(self, event):
        if event.type() == QtCore.QEvent.ShortcutOverride:
            # need to emit a  Key_Enter event here
            event.accept()
        return super(AddresseeListView, self).event(event)

    def mousePressEvent(self, event):
        self.add_and_edit()

    def add_and_edit(self):
        '''Add a new row and open editor'''
        print 'adding row'
        new_item = QtGui.QStandardItem('')
        self.model().appendRow(new_item)
        self.edit(self.model().indexFromItem(new_item))

    def delete_invalid_index(self, index):
        '''Remove invalid entry'''
        self.model().removeRow(index.row())

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    users = [{'name':'aa'}, {'name':'bb'}]
    groups = [{'code':'cc'}, {'code':'dd'}]
    w = AddresseeListView(users, groups)
    w.show()
    w.raise_()
    app.exec_()


​
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