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

c++, qlineedit, qt

Solution

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

Ex:

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

Problem

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

Original source