How to scroll to the specified line in QPlainTextEdit?

Question

Assuming I have a line number in the variable ln.

int ln=25;

When I pass ln to QPlainTextEdit, the scrollbar will scroll to the line 25 in QPlainTextEdit.

How to implement this feature? Could anybody give me some advice? I would be very grateful

Answer 1

Use QPlaintextEdit::document to get the QTextDocument.

Use QTextDocument::findBlockByLineNumber to get QTextBlock of a specific line number. Remember though, it starts from line 0, not line 1.

Then create a QTextCursor using this QTextBlock and set it to your QPlainTextEdit.

int ln=25;
QTextCursor cursor(p_textEdit->document()->findBlockByLineNumber(ln-1)); // ln-1 because line number starts from 0
p_textEdit->setTextCursor(cursor);