<![CDATA[QComboBox confusion]]>I am trying to implement a zoom select with QComboBox. Lets assume there are the following items in the combo box:
25% -> should lead to a signal setZoom(25)
50% -> should lead to a signal setZoom(50)
100% -> should lead to a signal setZoom(100)

So far, so good. Now comes the challenge: The combo should be editable. When the user types 80 <ENTER>, a signal setZoom(80) should be emitted and the text in the combo should be set to "80%", but NO new item should be added to the drop down menu.

I have fiddled with different events of QComboBox and the QLineEdit inside but I can't see how to do this. Any hints?

Cheers,

Eddy

]]>https://forum.qt.io/topic/45056/qcombobox-confusionRSS for NodeMon, 16 Mar 2026 11:42:51 GMTWed, 20 Aug 2014 09:53:49 GMT60<![CDATA[Reply to QComboBox confusion on Wed, 20 Aug 2014 11:06:06 GMT]]>Something like this should work:
@
ui->comboBox->setEditable(true);
ui->comboBox->setInsertPolicy(QComboBox::NoInsert);

connect(ui->comboBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
[=](int index){
emit setZoom(getZoomFromText(ui->comboBox->itemText(index)));
});

connect(ui->comboBox->lineEdit(), &QLineEdit::returnPressed,
={
emit setZoom(getZoomFromText(ui->comboBox->lineEdit()->text()));
});
@

Edit ups, too slow :)

]]>https://forum.qt.io/post/240547https://forum.qt.io/post/240547Wed, 20 Aug 2014 11:06:06 GMT<![CDATA[Reply to QComboBox confusion on Wed, 20 Aug 2014 10:56:54 GMT]]>Hi,

Did you try setting "insertPolicy":http://qt-project.org/doc/qt-4.8/qcombobox.html#insertPolicy-prop to QComboBox::NoInsert ?

]]>https://forum.qt.io/post/240546https://forum.qt.io/post/240546Wed, 20 Aug 2014 10:56:54 GMT