QLineEdit - Delete text when inserting another one

Oreonan

Hi,
I have a modal window with a QComboBox editable.
When I past a text to this combo, I want to delete old text and replace it by newest.
I tried this:
connect(ui.mediafileComboBox->lineEdit(), &QLineEdit::textEdited, this, &MyModal::slotTxtChange);

void MyModal::slotTxtChange(const QString &text)
{
ui.myCombo->lineEdit()->clear();
ui.myCombo->lineEdit()->setText(text);
}
But I have to past 2 times my text to this code take effect.
Have you an idea?
Thanks.

SGaist

Hi,

Do you mean that you would like the whole original text to be selected when the line edit gets the focus so you can just past over it ?

Oreonan

No, because if I do this, there introduce an accessibility issue on Linux. It's why I want to use signals and slots.
But right, select text when combo gets focus is working.

SGaist

Which accessibility issue ?

Oreonan

I've an history of latest lines in my combo, on Linux if I select text of current line, Orca has some difficulties to read lines.

SGaist

From the looks of it, you can't override paste.
Maybe an event filter on the QShortCutEvent might do the trick when dealing with the Paste shortcut.

Oreonan

Do you mean something like this?
void myModal::keyPressEvent(QKeyEvent* e)
{
ui.myCombo->lineEdit()::keyPressEvent(e);

if(e->matches(QKeySequence::Paste))
{
    slotTxtChange();
}

}
But how I can retrieve content to past to my function to delete current text and insert the newest?

SGaist

I would just call clear followed by paste.

Oreonan

QLineEdit has no function named paste, right?
Should I integrate another class?

SGaist

Sure it does: QLineEdit::paste

Oreonan

Oh yes sorry.
So I made the following:
void myModal::keyPressEvent(QKeyEvent* e)
{
if(e->matches(QKeySequence::Paste))
{
ui.myCombo->lineEdit()->clear();
ui.myCombo->lineEdit()->paste();
}
}
But I get the following error:
error: invalid use of incomplete type 'class QKeyEvent'
if(e->matches(QKeySequence::Paste))
^~
sorry I'm not very good at handling QKeyEvent

SGaist

You did not include the corresponding header.

Oreonan

Oh, yes, right.
Latest thing, now it's working, but all other keys are without any effect.
What should I add to let QT use other keys as expected?

SGaist

Call the base class implementation for all the other cases.

Oreonan

Oh it was note latest thing :), so now I have this line added after my condition:
QLineEdit::keyPressEvent(e);
but I give the following error:
error: cannot call member function 'virtual void QLineEdit::keyPressEvent(QKeyEvent*)' without object

SGaist

You cannot call the base class implementation of a different class.

Note that I suggested to use an event filter not to override the keyPressEvent of a different class.

Oreonan

OK I understood. So I made this:
bool myModal::eventFilter(QObject *object, QEvent *event)
{
if (object == ui.myCombo->lineEdit() && event->type() == QEvent::KeyPress) {
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
if (keyEvent->matches(QKeySequence::Paste))
{
ui.myCombo->lineEdit()->clear();
ui.myCombo->lineEdit()->paste();
return true;
} else
return false;
}
return false;
}

but I still have to press CTRL+V twice to have this code works as expected :(

SGaist

What if you just call clear and then return false ?

Oreonan

I found. It's working without the ->lineEdit() after ui.myCombo.
Thanks for your help.