😂 How do you move a parent QGraphicsObject precisely by moving its child?

[enjoysmath]

The default is that the movements in the parent move the child because the child is in the parent's local coordinates always.

I want the reverse of this.

I know I can get it working with a position_changed signal, but I wanted to try it now with a sceneEventFilter. It's not working

Insert obvious, naive code that listens for GraphicsSceneMousePress -and- GraphicsSceneMouseMove in event.type() to no avail.

What is the canonical way to accomplish this?

I would add that, the children in question are always within the parent's bounding rect.

[enjoysmath]

from PyQt5.QtWidgets import (QGraphicsObject, QMainWindow, QGraphicsTextItem, 
                             QApplication, QGraphicsScene, QGraphicsView)

class A(QGraphicsObject):
    def __init__(self):
        super().__init__()
        #self.setFiltersChildEvents(True)
        
    def boundingRect(self):
        return self.childrenBoundingRect()
    
    def paint(self, painter, option, widget):
        painter.drawRect(self.boundingRect())
        
    
class B(A):
    def __init__(self, text):
        super().__init__()
        self.text = QGraphicsTextItem(text)
        self.text.setParentItem(self)
        #self.text.installSceneEventFilter(self)
        
class C(A):
    def __init__(self, text):
        super().__init__()
        self.b = B(text)
        self.b.setParentItem(self)
        self.setFlags(self.ItemIsMovable)
        
if __name__ == '__main__':
    import sys
    app = QApplication([])
    
    wind = QMainWindow()
    wind.show()
    
    view = QGraphicsView()
    scene = QGraphicsScene()
    view.setScene(scene)
    wind.setCentralWidget(view)
    
    c = C('See?')
    scene.addItem(c)
    
    sys.exit(app.exec_())

Here's the min example code, but it works... so...

Any idea why this minimal example should work as I have described? What is causing it to work?

[enjoysmath]

K got it to work in my code now. Thanks, newbleets!