how to add an action to QtCore.Qt.DefaultContextMenu on Qdoublespinbox on right cilck?

Question

I have developed a fairly complex GUI tool using the Qt Designer.

For more details about the tool see: https://github.com/3fon3fonov/trifon

I have defined m

Answer 1

As we want to add a QAction to the default context menu we first overwrite the contextMenuEvent event and use a QTimer to call a function that filters the toplevels and get the QMenu that is displayed and there we add the QAction:

doublespinbox.py

from PyQt5 import QtCore, QtWidgets

class DoubleSpinBox(QtWidgets.QDoubleSpinBox):
    minimize_signal = QtCore.pyqtSignal()

    def __init__(self, *args, **kwargs):
        super(DoubleSpinBox, self).__init__(*args, **kwargs)
        self.setContextMenuPolicy(QtCore.Qt.DefaultContextMenu)

    def contextMenuEvent(self, event):
        QtCore.QTimer.singleShot(0, self.add_actions)
        super(DoubleSpinBox, self).contextMenuEvent(event)

    @QtCore.pyqtSlot()
    def add_actions(self):
        for w in QtWidgets.QApplication.topLevelWidgets():
            if isinstance(w, QtWidgets.QMenu) and w.objectName() == "qt_edit_menu":
                w.addSeparator()
                minimize_action = w.addAction("minimize this parameter")
                minimize_action.triggered.connect(self.minimize_signal)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = DoubleSpinBox()
    w.show()
    sys.exit(app.exec_())

---

To use DoubleSpinBox in Qt Designer, first place doublespinbox.py next to your .ui:

├── ..
├── rvmod_gui.ui
├── doublespinbox.py   
├── ...

then you must promote the widget to do so right click on the QDoubleSpinBox and select the option "Promote to ..." by adding the following to the dialog:

Then click on the Add button and then the Promote button.

For the other QDoubleSpinBox, right click and select the new Promote To option where the DoubleSpinBox option is.

---

You can find an example here