is it possible to "update" a QTextCursor? - c++

Question

In a QTextEdit object, let's say I want to know the character's position under the mouse cursor.
I can write...
void MyQTextEditObject::mousePressEvent(QMouseEvent* mouse_event) {
mycursor = this->textCursor();
qDebug() << "pos=" << mycursor.position();
}
... it works (the mouse position changes from 0 to the last index of the last character) but the mousePressEvent() method creates a new cursor every time an event occurs. It bothers me since I don't know the "cost" of such a creation.
So, why not create a cursor attribute and use it in mousePressEvent() ?
Something like :
class MyQTextEditObject : public QTextEdit {
Q_OBJECT
public:
// [...]
QTextCursor cursor;
}
MyQTextEditObject::MyQTextEditObject(QWidget* parent) : QTextEdit(parent) {
// [...]
this->cursor = this->textCursor();
}
void MyQTextEditObject::mousePressEvent(QMouseEvent* mouse_event) {
qDebug() << "pos=" << this->cursor.position();
}
But the position doesn't change anymore, as if it was fixed. So, is there a way to somehow update the cursor ? Or is the cost of repeated creation of a QTextCursor insignificant ?
update : writing something like...
mycursor= this->cursorForPosition(mouse_event->pos());
... creates a new cursor and seems to be the equivalent to :
mycursor= this->textCursor();

Answer 1

In your first example, instead of
mycursor = this->textCursor();
qDebug() << "pos=" << mycursor.position();
why do not you call it directly as?
qDebug() << "pos=" << this->textCursor().position();
Because in python
self.textCursor().position()
works.
Also, I am not sure but in your second example maybe you need to set the "cursor" as "textCursor" again with setTextCursor().
void MyQTextEditObject::mousePressEvent(QMouseEvent* mouse_event) {
this->setTextCursor(cursor)
qDebug() << "pos=" << this->cursor.position();
}