How to change the text of a QLineEdit when the user click on the QLineEdit in Qt?

Question

I have a QLineEdit with the text "Search contents..." .

1. I would like when QLineEdit has the focus or when the cursor go inside the text that the text is set to an empty string. [This works: I have no problem, I used the cursorPositionChanged signal of QLineEdit ].

2. I would like also when the QLineEdit leaves the focus and if the text is empty that the text of the QLineEdit is set to "Search contents..." . [I don't know how to do that].

Answer 1

QLineEdit的placeholderText属性正是您所需要的。