Qt How to find an object in widgets using positions x () and y ()

Question

I have MainWindow. On MainWindow, I have several Qlabel. Now I need to find QLabel. Using MousePressEvent, I can get the X () and Y () position of the mouse click.

How can I use this coordinate to identify QLabel ??

Is there any function in QT to find an object clicked using the X () and Y () coordinates?

Answer 1

Since QLabel is a subclass of QWidget, you can handle mouse click events in QLabel :: mousePressEvent

virtual void mousePressEvent ( QMouseEvent * ev ) 

But in QMainWindow you can use childAt to get child widgets in x, y

 QWidget * QWidget::childAt ( int x, int y ) const QLabel* label= static_cast<QLabel*>(mainWindow->childAt(x,y)); 

More details: http://doc.qt.io/qt-5/qwidget.html#childAt

Answer 2

In Qt5, this also works.

 QTabBar *widget =(QTabBar*) qApp->widgetAt(QCursor::pos()); 

Answer 3

Use widgetAt function inside QApplication

 QWidget *widget = qApp->widgetAt(x,y); 

which can then be dynamic_cast in QLabel .

Answer 4

Instead of trying to determine which label the mouse coordinates clicked on, you can also use mousePressEvent() labels.

For example, make your own overloaded shortcut class and on mousePressEvent() emit a clicked() signal, which you can then bind to the slot.