QLineEdit not clear when I selected an item after get focus in second time

[Kaguro]

Hi Guys!
Sorry for the long title but I couldn't compress my problem title :(
I have a QLineEdit with QCompleter and I have a couple of main goals:

• When I Select the correct text from QCompleter ( with keyboard OR mouse click ) then hide the completer listview CLEAR the QLineEdit. ( I will deal with the selected text elsewhere and it does not affect this )

• When I type in QLineEdit and hit enter, select the first item from ListView, the listview hide and clear the QLineEdit.

But which is very strange to me and I really don't understand: First time my solution works. But when i click on another widget (fe: to a QPushButton) so LineEdit lose focus, and i click back to the lineedit (get focus again) it breaks, and when it should clear the lineedit, the selected element from QCompleter remains in it (it only disappears if I press an extra enter). here is my class from QLineEdit:

searchbar_tetelek::searchbar_tetelek(QWidget *parent):m_parent(parent)
{
    this->installEventFilter(this);
    this->setMaxLength(45);
    this->setObjectName("itemsearchb");
    this->setSizePolicy(QSizePolicy::Preferred,QSizePolicy::Preferred);
    this->setAlignment(Qt::AlignVCenter);

    font.setItalic(true);
    font.setPointSize(10);
    font.setBold(true);
    this->setFont(font);

    this->setPlaceholderText("Search");
    this->setFrame(false);

    connect(this, &QLineEdit::textChanged, [=]() {
        if(this->text().isEmpty())
        {
            font.setItalic(true);
            this->setFont(font);
        }
        else
        {
            font.setItalic(false);
            this->setFont(font);
        }
    });
    this->adjustSize();

    this->view = new QListView;
    this->completer = new QCompleter;

    completer->setCaseSensitivity(Qt::CaseInsensitive);
    completer->setFilterMode(Qt::MatchContains);
    completer->setPopup(view);
    completer->setCompletionMode(QCompleter::PopupCompletion);
    connect(this,&QLineEdit::returnPressed,[=]{Entered(); });
    this->setCompleter(completer);
    this->setContentsMargins(0,0,0,0);

    QHBoxLayout *hMain = new QHBoxLayout(this);
    ClickableLabel *tutu = new ClickableLabel();
    tutu->setPixmap(QIcon(":/RES/ico_1base_multiply.svg").pixmap(16,16));
    tutu->setFixedWidth(40);
    tutu->setAlignment(Qt::AlignCenter);
    tutu->setObjectName("searchside");
    tutu->setStyleSheet("#searchside{border-left:0.09em solid rgb(249, 249, 249);background:transparent;} QLineEdit[text=\"\"]{font-style: italic;color:red;}");
    connect(tutu,&ClickableLabel::clicked, [=]{this->setFocus();this->setText("");});
    connect(completer, SIGNAL(activated(const QString&)),this, SLOT(clear()),Qt::QueuedConnection);
    tutu->setCursor(Qt::PointingHandCursor);
    hMain->setAlignment(Qt::AlignRight);
    hMain->addWidget(tutu);
}

void searchbar_tetelek::SetItems(QStringList itemList)
{
    this->items = itemList;
    completer->setModel( new QStringListModel(items) );
}

void searchbar_tetelek::Entered()
{
    if(view->isVisible())
    {
        if(view->currentIndex().row()==-1)
        {
            view->setCurrentIndex(view->model()->index(0,0));
        }
    }
    else if(this->text()=="")
    {
        completer->setCompletionPrefix("");
        completer->complete();
    }
}

void searchbar_tetelek::showEvent(QShowEvent *)
{
    this->setFocus();
}

bool searchbar_tetelek::eventFilter(QObject *sender, QEvent *event)
{
    if(sender == this)
    {
        QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);

        if( keyEvent->key() == Qt::Key_Escape)
        {   
            this->setText("");
            return true;
        }
        else
            return false;

    }
    return QWidget::eventFilter(sender,event);
}

And the implementation:
(the AddtoBill function is just do something with the selected text)

this->searchTetelek = new searchbar_tetelek(this);
connect(searchTetelek,&QLineEdit::returnPressed,[=] {SearchAdd();});
connect(searchTetelek->view,&QListView::clicked,[=] {SearchAdd();});

void mywidgetv2::SearchAdd()
{
    QString string = searchTetelek->view->currentIndex().data().toString();

    for(int i = 0;i < itemGroups->count();i++)
    {
        for(int j=0;j<itemGroups->at(i).items.count();j++)
        {
            if(itemGroups->at(i).items.at(j).CIKNEV == string)
            {
                AddtoBill(itemGroups->at(i).items.at(j),true,Newpc);
                searchTetelek->view->setCurrentIndex(searchTetelek->view->model()->index(-1,0));
                searchTetelek->setText("");
                return;
            }
        }
    }
    searchTetelek->setText("");
}

I dont know where are my mistakes. Thank you for your help!

[Axel Spoerl]

@Kaguro
While I understand the approach, I believe shoehorning that into a QCompleter is risky business. As I the name indicates, the completer wants to complete the line edit.
If that behaviour is unwanted, it’s maybe better to instantiate a QListView with a suitable model, display it over the line edit when a fitting key is hit and then implement what’s needed.

[Kaguro]

@Axel-Spoerl said in QLineEdit not clear when I selected an item after get focus in second time:

While I understand the approach, I believe shoehorning that into a QCompleter is risky business. As I the name indicates, the completer wants to complete the line edit.
If that behaviour is unwanted, it’s maybe better to instantiate a QListView with a suitable model, display it over the line edit when a fitting key is hit and then implement what’s needed.

Okay thanks for your answer! But I don't understand why it works fine when it first gets focus, but then it doesn't for the rest. Why could this be? Because I would be happy if I could avoid this problem and then I would be ready. Any idea why this might be? Thanks your answer again!

[Axel Spoerl]

@Kaguro
It's a bit hard to tell, what the a QCompleterand a corresponding QLineEditdo, if their connection is intercepted. There is a bug which we currently work on, which has to do with focus setting on a completer. Maybe it's related. You could follow it up, it's gonna be merged soon.