I want to create an editable QComboBox which filters results according to the search query and updates the dropdown entries accordingly.
After reading How do I Filter the PyQt QCombobox Items based on the text input? I tried to implement something similar in C++.
But I can't store anything inside the QComboBox now. Even after adding new entries through addItem() the total count remains 0.
What is the reason for this and how do I insert entries inside the QComboBox with QSortFilterProxyModel?
Here is the relevant snippet of the code:
SearchBox = new QComboBox(this);
SearchBox->setEditable(true);
// Try adding a few entries and check if they persist after changing the model
SearchBox->addItem(QString("hi"));
SearchBox->addItem(QString("bye"));
int count = SearchBox->count(); // count = 2
ProxyModel = new QSortFilterProxyModel;
ProxyModel->setSourceModel(SearchBox->model());
ProxyModel->setFilterCaseSensitivity(Qt::CaseSensitivity::CaseInsensitive);
SearchBox->setModel(ProxyModel);
// Check count again
count = SearchBox->count(); // count = 0 <- Why?
// Try adding new entries
SearchBox->addItem(QString("Hi again"));
count = SearchBox->count(); // count = 0 .. So new entries don't get stored
Completer = new QCompleter(ProxyModel,this);
Completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
SearchBox->setCompleter(Completer);
QObject::connect(SearchBox->lineEdit(), SIGNAL(textChanged(const QString)), ProxyModel, SLOT(setFilterFixedString(const QString)));
QObject::connect(Completer, SIGNAL(activated(const QString &)), this, SLOT(onCompleterActivated(const QString &)));