Mouse pointer position when a label is activated - c++

Question

When an object of QLabel sub class is actived, how can one find if the mouse pointer is on the label and get its position if it is?
QWidegt::event() can check the event type of QEvent::WindowActivate, but it provides no information about mouse pointer position.
UPDATE
According to comment by #Mathias Schmid , I create the following code. It verifies itself that both focusInEvent and focusOutEvent can happen. However, I still cannot get the mouse pointer position. Maybe I am missing the part of "bind enable/disable of mouse tracking to focus in and out events", or something else.
#include "mainwindow.h"
#include <QApplication>
#include <QtWidgets>
#include <QtCore>
class MyLabel : public QLabel
{
public:
MyLabel(QWidget*parent = nullptr) : QLabel(parent)
{
setMouseTracking(true);
setFocusPolicy(Qt::FocusPolicy::StrongFocus);
}
protected:
virtual void focusInEvent(QFocusEvent *ev) override
{
(void)ev;
this->setText(__PRETTY_FUNCTION__);
}
virtual void focusOutEvent(QFocusEvent *ev) override
{
(void)ev;
this->setText(__PRETTY_FUNCTION__);
}
virtual void mouseMoveEvent(QMouseEvent *ev) override
{
this->setText(QString::number(ev->pos().x()) +", " +QString::number(ev->pos().y()));
QLabel::mouseMoveEvent(ev);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MyLabel w;
w.setFixedSize(400, 300);
w.show();
return a.exec();
}
Update 2: solution
Thanks to #Mathias Schmid, the final solution is to use static function QCursor::pos() in focusInEvent().
#include "mainwindow.h"
#include <QApplication>
#include <QtWidgets>
#include <QtCore>
#include <QCursor>
class MyLabel : public QLabel
{
public:
MyLabel(QWidget*parent = nullptr) : QLabel(parent)
{
setMouseTracking(true);
setFocusPolicy(Qt::FocusPolicy::StrongFocus);
}
protected:
virtual void focusInEvent(QFocusEvent *ev) override
{
(void)ev;
QPoint pos = QCursor::pos();
QString msg = QString(__PRETTY_FUNCTION__) + ": \n" + QString::number(pos.x()) + ", " + QString::number(pos.y());
QPoint posLocal = this->mapFromGlobal(pos);
if(this->rect().contains(posLocal))
msg += "\nLocal pos: " + QString::number(posLocal.x()) + ", " + QString::number(posLocal.y());
this->setText(msg);
QLabel::focusInEvent(ev);
}
virtual void focusOutEvent(QFocusEvent *ev) override
{
(void)ev;
this->setText(QString(__PRETTY_FUNCTION__));
QLabel::focusOutEvent(ev);
}
virtual void mouseMoveEvent(QMouseEvent *ev) override
{
this->setText(QString::number(ev->pos().x()) +", " +QString::number(ev->pos().y()));
QLabel::mouseMoveEvent(ev);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MyLabel w;
w.setFixedSize(450, 300);
w.show();
return a.exec();
}

Answer 1

To check if mouse cursor is on custom widget derived from QLabel at time when it gets focus just override focusInEvent() and handle mouse cursor position check there.
MyLabel.h
class MyLabel: public QLabel
{
Q_OBJECT
public:
MyLabel(QWidget *parent = nullptr);
~MyLabel();
protected:
virtual void focusInEvent(QFocusEvent *event) override;
};
MyLabel.cpp
MyLabel::MyLabel(QWidget *parent)
: QLabel(parent)
{
setFocusPolicy(Qt::StrongFocus);
}
MyLabel::~MyLabel()
{
}
void MyLabel::focusInEvent(QFocusEvent *event)
{
if (event) {
const QPoint cursorPos = QCursor::pos();
if (rect().contains(mapFromGlobal(cursorPos))) {
// TODO: Add desired action
}
QLabel::focusInEvent(event);
}
}