RemoveAllObservers do not work

Support
1

I want to remove all observers in interactor, but it do not work. My code is:


from PyQt5.QtWidgets import *
import sys, os
import vtk
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor

def mouseMoveEvent(iren, event):
    print('move')

class MyWin(QWidget):
    def __init__(self):
        super().__init__()

        layout = QVBoxLayout()
        self.setLayout(layout)

        self.vtkWidget = QVTKRenderWindowInteractor()
        layout.addWidget(self.vtkWidget)
        self.ren = vtk.vtkRenderer()
        self.vtkWidget.GetRenderWindow().AddRenderer(self.ren)

        interactor = self.vtkWidget.GetRenderWindow().GetInteractor()
        interactor.Initialize()
        interactor.RemoveAllObservers()
        interactor.AddObserver('MouseMoveEvent', mouseMoveEvent)
        interactor.Start()

        self.imageViewer = vtk.vtkImageViewer2()
        self.imageViewer.SetupInteractor(interactor)
        self.imageViewer.SetRenderWindow(self.vtkWidget.GetRenderWindow())

        img = vtk.vtkDICOMImageReader()
        img.SetFileName('C:\\Users\\MLoong\\Desktop\\dicom_data\\Chang Cheng\\TOF\\IM_0174')
        img.Update()

        self.imageViewer.SetInputData(img.GetOutput())
        self.imageViewer.Render()




if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MyWin()
    window.show()
    app.exec_()

Is there anything wrong with my code?

2

Hi,
Could you please be more specific and explain what do you get, what do you expect and what you think is not working here?
J.

3

Very sorry for the unclearing question. I want to remove all observers and implement myself observers. I hope interactor.RemoveAllObservers() can remove all observers. If it work, nothing will happen for zoom in and pan operation (press left/right mouse and move). However, I find that the image still zoom in when I press the left mouse and move.

Also, the following code works:

        self.vtkWidget = QVTKRenderWindowInteractor()
        layout.addWidget(self.vtkWidget)
        self.ren = vtk.vtkRenderer()
        self.vtkWidget.GetRenderWindow().AddRenderer(self.ren)

        interactor = self.vtkWidget.GetRenderWindow().GetInteractor()
        interactor.Initialize()
        

        self.imageViewer = vtk.vtkImageViewer2()
        self.imageViewer.SetupInteractor(interactor)
        self.imageViewer.SetRenderWindow(self.vtkWidget.GetRenderWindow())

        img = vtk.vtkDICOMImageReader()
        img.SetFileName('C:\\Users\\MLoong\\Desktop\\dicom_data\\Chang Cheng\\TOF\\IM_0174')
        img.Update()

        self.imageViewer.SetInputData(img.GetOutput())
        self.imageViewer.Render()

        interactor.RemoveAllObservers()
        interactor.AddObserver('MouseMoveEvent', mouseMoveEvent)
        interactor.Start()

However, I need to firstly create interactor the myself observer, and then (click a button) create the imageviewer. So, is there any method to RemoveAllObservers before imageViewer.SetupInteractor(interactor) ?