QlineEdit selectAll doesn't work?

Question

I use folowing code. In it lineEdit->selectAll() works called by pushButton and only at first launch called by eventFilter. Although label->setText works all time propperly. Why?

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->lineEdit->installEventFilter(this);
}

void Widget::on_pushButton_clicked()
{
    ui->lineEdit->selectAll();
}

bool Widget::eventFilter(QObject *object, QEvent *event)
{
    if (object == ui->lineEdit && event->type() == QEvent::FocusIn )
    {
        ui->lineEdit->selectAll();
        ui->label->setText("Focused!");
        return false;
    }
    if (object == ui->lineEdit && event->type() == QEvent::FocusOut )
    {
        ui->label->setText("unFucused!");
        return false;
    }
    return false;
}

UPD: Did what Ilya recomended. Still have same problem.

void myLine::focusInEvent(QFocusEvent* event)
{
    setText("Focused!");
    selectAll();
}

void myLine::focusOutEvent(QFocusEvent* event)
{
    setText("UnFocused!");
}

Why are you not using the focusInEvent / focusOutEvent of `QWidget` ? — Ilya, Feb 26 '16 at 14:22
Is it (using the focusInEvent) possible if i created `QLineEdit` by designer? — Shatodor, Feb 26 '16 at 14:37
I should add this:`void lineedit::focusInEvent(QFocusEvent* event) { ui->lineEdit->selectAll(); QLineEdit::focusInEvent(event); }` ? But where in code? — Shatodor, Feb 26 '16 at 14:47
No, adding that code in widget.cpp makes warning `'lineedit' has not been declared`. — Shatodor, Feb 26 '16 at 14:57
Ah OK, your question is "how do I subclass my lineEdit", is it ? — Ilya, Feb 26 '16 at 15:05
Rather "how do I subclass my lineEdit created by disigner?". — Shatodor, Feb 26 '16 at 15:11

score 6 · Accepted Answer · edited May 23 '17 at 11:45

6

Found answer here Select text of QLineEdit on focus

Instead ui->lineEdit->selectAll() should use QTimer::singleShot(0,ui->lineEdit,SLOT(selectAll())), because mousePressEvent trigers right after focusInEvent so text selected in focusInEvent unselects by mousePressEvent.

edited May 23 '17 at 11:45

Community

1
1

answered Mar 01 '16 at 14:46

Shatodor

91
1
7

Thanks, that clears up things to me too. Can I make any assumptions on the order of events triggering? – so.very.tired Dec 21 '18 at 08:32

score 0 · Answer 2 · answered Feb 26 '16 at 15:18

Not really answering the question, but there's a more "standard" way of customizing these events.

Create a QLineEdit subclass and define your own focusInEvent / focusOutEvent handlers.
If you're using the UI Designer, promote your lineEdit to your subclass (right-click > "Promote to").

score -1 · Answer 3 · answered Feb 26 '16 at 13:53

Because you use eventFilter in a wrong way:

bool Widget::eventFilter(QObject *object, QEvent *event)
{
    if (object == ui->lineEdit && event->type() == QEvent::FocusIn )
    {
        ui->lineEdit->selectAll();
        ui->label->setText("Focused!");
    }
    if (object == ui->lineEdit && event->type() == QEvent::FocusOut )
    {
        ui->label->setText("unFucused!");
    }
    return QWidget::eventFilter(object, event);
}

QlineEdit selectAll doesn't work?

3 Answers3