How to update contents in QMenu?

Coding
1

I have a UI in which it consists of a few QPushButton and a QLineEdit and currently I am having trouble to ‘update’ the contents within this QMenu that was attached onto a QPushButton.
So assumingly, if there are already 2 cameras in my scene, and as I execute my UI, by pressing onto this setCameraBtn I will get the 2 cameras in the list. However, if I create a new camera where the UI is not yet close, how do I make my QMenu to read in the new camera, like a ‘live-update’?

I tried creating another function where it re-read the cameras in scene and retabulate the camLs as well as a connection similar to the one that I have written in the createConnections but it does not seems to be reading in.


camLs = []

class orientCameraUI(QDialog):
    def __init__(self, parent=None):
        ...
        ...

    def initUI(self):
        ...
        ...

    def createConnections(self):
        self.connect(self.orientToCamBtn, SIGNAL('clicked()'), self.orientToCam)
    
    def camMenu(self):
    
        allCams = [cam for cam in cmds.listRelatives(cmds.ls(cameras=1),parent=1) if cam not in ['front','persp','side','top']]
        camLs.extend(allCams)
        
        menu = QMenu("menu", self.setCameraBtn)
        
        for item in camLs:
            menu.addAction(QAction(item, menu))
        self.setCameraBtn.setMenu(menu)
        
        menu.triggered.connect(self._camSelected)
        
    def _camSelected(self, action):
        self.currentCamTxt.setText(action.text())
2

Upon adding in this line in the createConnections(), I have sort of got it to work but there is a “lag” in updating the list.
I have to click twice on the button in order to get it to work, in which this is not effective…

self.connect(self.setCameraBtn, SIGNAL('pressed()'), self.camMenu)
3

Funnily enough, while using ‘clicked()’ as the signal, it does not seems to generate anything, despite I have read from docs that clicked is equivalent to Pressed and Released? Any advices?

4

whatever code finds the cameras and adds them as menu items to your menu, I would put that code in its own function and connect it to the Clicked() signal of the button.

in pseudo code:

    
    def buttonContextMenu(self, position):
        cameraMenu = QtGui.QMenu(self)
        for cam in cmds.ls(type='camera'):
            cameraMenu.addAction(cam)
        cameraMenu.popup(position)
    ...
    myCameraButton.clicked.connect(buttonContextMenu))