Qt (C++): Add background text in line edit

Question

I want to be able to add a line of (grey) text that when you type in the line edit, goes away. So the text is not actually there, it is just displayed.

For example:
Before I type something, the grey background text is there:
https://i.stack.imgur.com/2U955.png

After I type something, the text goes away, replaced by the text entered:
https://i.stack.imgur.com/JXVAQ.png

Answer 1

void QLineEdit::setPlaceholderText( const QString & ) is what you are looking for:

Ex:

ui->lineEdit->setPlaceholderText(QString("Type here"));