如何让同胞窗户接受事件？

Question

我写了一个简单的窗口，当qlineedit中的光标中，我想要qgraphicsRectitem，qgraphicsscene，， qgraphicsView和qwidget也接受qkeyevent或myEvent（自定义事件）。我不知道这样做，有人有很好的方法吗？

代码样本

from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *

class MyEvent(QEvent):
    Type = QEvent.registerEventType()
    def __init__(self):
        super().__init__(MyEvent.Type)
        self._data = "test"

class Item(QGraphicsRectItem):
    def __init__(self):
        super().__init__()
        self.setRect(0 ,0,  100, 100)
        self.setBrush(Qt.red)
        self.setFlags(QGraphicsItem.ItemIsFocusable)

    def keyPressEvent(self, event: QKeyEvent) -> None:
        print("Item KeyPress", event.key())
        return super().keyPressEvent(event)

class Scene(QGraphicsScene):
    def keyPressEvent(self, event: QKeyEvent) -> None:
        print("Scene KeyPress", event.key())
        return super().keyPressEvent(event)

class View(QGraphicsView):
    def keyPressEvent(self, event: QKeyEvent) -> None:
        print("View KeyPress", "do something work here", event.key())
        return super().keyPressEvent(event)

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        lay = QVBoxLayout()
        view = View()
        scene = Scene()
        scene.addItem(Item())
        view.setScene(scene)
        lay.addWidget(view)
        lay.addWidget(QLineEdit("Cursor In here, post Enter Event to QGraphicsView"))
        self.setLayout(lay)
        self.show()

        self.view = view

    def keyPressEvent(self, e: QKeyEvent) -> None:
        print("QWidget KeyPress", e.key())

        # myEvent = MyEvent()
        # QApplication.postEvent(myEvent)
        return super().keyPressEvent(e)

app = QApplication([])
m = MainWindow()
app.exec()

让其他项目还如何获得活动？