How to pick point with out key press in pyvista

I am using pyvista to visualize stl file. To get point information, i used below code to achieve this

import pyvista as pv

p = pv.Plotter()

mesh = pv.read(filename)

p.add_mesh(mesh) 

def callback(x, y) :return

p.enable_point_picking(callback=callback) 

p.show()

I could pick point by keeping cursor on point and press key 'P'.

I want this function without key press by clicking on mouse. is it possible?

I got one solution for this action. as pyvista is base from vtk, i used vtk function and it is working fine. if anyone found better solution, please post.

mouse=pv._vtk.vtkInteractorStyleTrackballCamera()
mouse.SetDefaultRenderer(plotter.ren_win.GetRenderers().GetFirstRenderer())
plotter.SetInteractorStyle(mouse)

def clicked(m,event):
    try:
        modifiers = QApplication.keyboardModifiers()
        if modifiers==QtCore.Qt.ControlModifier:pass
        else:
            clickPos = m.GetInteractor().GetEventPosition()
            picker = pv._vtk.vtkPointPicker()
            picker.Pick(clickPos[0], clickPos[1],0, m.GetDefaultRenderer())
            actor=picker.GetActor()
            if actor!=None:print(actor)
            m.OnLeftButtonDown()
    except Exception as e:print(e)
mouse.AddObserver("LeftButtonPressEvent", clicked)

Thanks biomode. i edited my code as per your suggestion. it looks better

def clicked(event):
    picker = pv._vtk.vtkPropPicker()
    picker.PickProp(event[0], event[1],plotter.ren_win.GetRenderers().GetFirstRenderer())
    actor=picker.GetActor()
    if actor!=None:print(actor)
plotter.track_click_position(callback=clicked,side='left', viewport=True)