pyside6的QGraphicsView体系，当鼠标位于不同的物体，显示不同的右键菜单

代码：

# 设置样本图片的QGraphicsView模型
from PySide6.QtCore import Qt, QRectF, QObject
from PySide6.QtGui import QPainter, QPen, QColor, QAction, QMouseEvent
from PySide6.QtWidgets import QGraphicsView, QGraphicsScene, QGraphicsPixmapItem, QGraphicsRectItem, QMenu, QWidget, \QVBoxLayout, QFrame, QSizePolicy# 矩形方框（QGraphicsRectItem）模型
class MyRectItem(QGraphicsRectItem, QObject):def __init__(self, *args):QGraphicsRectItem.__init__(self, *args)QObject.__init__(self)  # 使用父辈的QObject的构造函数，利用它的信号槽机制self.menu = QMenu()  # 创建菜单对象# 启用鼠标跟踪，以便在没有按下鼠标按钮时也能接收鼠标移动事件self.setAcceptHoverEvents(True)self.setMenu()  # 设置菜单def setMenu(self):"""设置菜单"""action = QAction("方框菜单", self)  # 创建菜单项self.menu.addAction(action)  # 将菜单项添加到菜单中# def contextMenuEvent(self, event):   # 它也可以拥有自己的右键事件响应#     """鼠标右键菜单"""#     self.menu.exec(event.screenPos())  # 在鼠标位置显示菜单# 设置QGraphicsView模型
class MyView(QGraphicsView):def __init__(self, parent=None, autoScale=True):super().__init__(parent)self.autoScale = autoScale  # 自动缩放标志，是否全画幅显示self.image_item = QGraphicsPixmapItem()  # 创建图片对象self.set_scene()  # 设置场景self.set_menu()  # 设置菜单def set_scene(self):"""设置场景"""self.scene = QGraphicsScene()  # 创建窗口场景# 设置渲染提示self.setRenderHint(QPainter.Antialiasing)  # 开启抗锯齿self.setRenderHint(QPainter.SmoothPixmapTransform)  # 开启平滑缩放# 设置缩放锚点self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)  # 转换时以鼠标为中心self.setResizeAnchor(QGraphicsView.AnchorUnderMouse)  # 缩放时以鼠标为中心self.setScene(self.scene)  # 将场景应用到视窗中# 处理滚轮事件以实现缩放def wheelEvent(self, event):"""处理滚轮事件以实现缩放"""factor = 1.001 ** event.angleDelta().y()  # 滚轮每滚动一格，缩放比例变化self.scale(factor, factor)def set_menu(self):"""设置菜单"""self.menu = QMenu(self)  # 创建菜单对象action = QAction("视图菜单", self)  # 创建菜单项self.menu.addAction(action)  # 将菜单项添加到菜单中self.image_item.menu = QMenu(self)  # 创建菜单对象action = QAction("图片菜单", self)  # 创建菜单项self.image_item.menu.addAction(action)  # 将菜单项添加到菜单中# 设置图像文件def set_image(self, pixmap):self.scene.clear()  # 清空场景self.scene_rect = QRectF(0, 0, pixmap.width(), pixmap.height())  # 设置场景范围self.image_item.setPixmap(pixmap)  # 创建图片对象self.scene.addItem(self.image_item)  # 将图片对象添加到场景中self.setAlignment(Qt.AlignmentFlag.AlignCenter)  # 设置视图对齐方式if self.autoScale:self.fitInView(self.image_item, Qt.AspectRatioMode.KeepAspectRatio)  # 设置视图适应图片，全幅显示def contextMenuEvent(self, event):"""鼠标右键菜单"""item = self.itemAt(event.pos())  # 获取鼠标位置处的图形项if item is None:  # 如果鼠标位置没有图形项self.menu.exec(event.globalPos())  # 在鼠标位置显示菜单else:try:item.menu.exec(event.globalPos())  # 在鼠标位置显示菜单except AttributeError:passif __name__ == "__main__":import sysfrom PySide6.QtWidgets import QApplicationfrom PySide6.QtGui import QPixmapapp = QApplication(sys.argv)widget = QWidget()  # 创建窗口对象widget.resize(800, 600)  # 设置窗口大小widget.layout = QVBoxLayout(widget)  # 创建垂直布局对象widget.view = MyView(widget)  # 创建MyView对象widget.layout.addWidget(widget.view)  # 将视图添加到布局中pixmap = QPixmap("flower.jpg")  # 创建QPixmap对象widget.show()  # 显示窗口widget.view.set_image(pixmap)  # 设置图像文件widget.view.scene.addItem(MyRectItem(100,100,100,100))  # 添加矩形框widget.view.scene.addItem(MyRectItem(300, 300, 100, 100))  # 添加矩形框sys.exit(app.exec())  # 进入程序的主循环，并通过exit()函数确保主循环安全结束

或者：

import sys
from PySide6.QtWidgets import QApplication, QGraphicsView, QGraphicsScene, QGraphicsRectItem, QGraphicsPixmapItem, QMenu
from PySide6.QtGui import QPixmap, QActionclass CustomGraphicsView(QGraphicsView):def __init__(self):super().__init__()scene = QGraphicsScene()# 添加图片pixmap = QPixmap("flower.jpg")pixmap_item = QGraphicsPixmapItem(pixmap)scene.addItem(pixmap_item)# 添加两个方框rect_item1 = QGraphicsRectItem(100, 100, 50, 50)rect_item2 = QGraphicsRectItem(200, 200, 50, 50)scene.addItem(rect_item1)scene.addItem(rect_item2)self.setScene(scene)def contextMenuEvent(self, event):item = self.itemAt(event.pos())if item:menu = QMenu(self)if isinstance(item, QGraphicsPixmapItem):action = QAction("图片右键菜单选项", self)menu.addAction(action)elif isinstance(item, QGraphicsRectItem):action = QAction("方框右键菜单选项", self)menu.addAction(action)menu.exec(event.globalPos())if __name__ == '__main__':app = QApplication(sys.argv)view = CustomGraphicsView()view.show()sys.exit(app.exec())