QTextEdit. How to select text manually?

Question

There are functions like textEdit->textCursor()->selectionStart() and textEdit->textCursor()->selectionEnd(), but there are no function

Answer 1

I encountered a similar problem. In Windows 10, there might be a bug of 'drag/move'. We use QT_NO_DRAGANDDROP as a compiler option, which makes text selection in QTextEdit not work anymore.

Solution:

void QTextEditEx::mouseMoveEvent(QMouseEvent *event)
{
    QTextEdit::mouseMoveEvent(event);
    if (event->buttons() & Qt::LeftButton)
    {
        QTextCursor cursor = textCursor();
        QTextCursor endCursor = cursorForPosition(event->pos()); // key point
        cursor.setPosition(pos, QTextCursor::MoveAnchor);
        cursor.setPosition(endCursor.position(), QTextCursor::KeepAnchor);
        setTextCursor(cursor);
    }
}

void QTextEditEx::mousePressEvent(QMouseEvent *event)
{
    QTextEdit::mousePressEvent(event);
    if (event->buttons() & Qt::LeftButton)
    {
        QTextCursor cursor = cursorForPosition(event->pos());
        // int pos; member variable
        pos = cursor.position();
        cursor.clearSelection();
        setTextCursor(cursor);
    }
}

reference:

1. Two existing answers

2. QTextEdit: get word under the mouse pointer?