[英]How can I subclass QGraphicsRectItem and QGraphicsEllipseItem in one class?
I'm using Pyside2 and have a UI that uses QGraphicsView and a QGraphicsScene.我正在使用 Pyside2 并且有一个使用 QGraphicsView 和 QGraphicsScene 的 UI。
Right now I have two separate classes that subclass QGraphicsEllipseItem and QGraphicsRectItem like this:现在我有两个独立的类,它们像这样子类化 QGraphicsEllipseItem 和 QGraphicsRectItem:
class MyRectButton(QGraphicsRectItem):
def contextMenuEvent(self, event):
# custom context menu
pass
def custom_method_A(self):
# add a custom method
pass
def custom_method_B(self):
# add a custom method
pass
class MyEllipseButton(QGraphicsEllipseItem):
def contextMenuEvent(self, event):
# custom context menu
pass
def custom_method_A(self):
# add a custom method
pass
def custom_method_B(self):
# add a custom method
pass
Rather than have the redundant methods in both classes I'd like one class that can either be a rectangle or an ellipse like:而不是在两个类中都有冗余方法,我想要一个可以是矩形或椭圆形的类,例如:
class MyButton():
def __init__(self,shape='Ellipse'):
pass
def contextMenuEvent(self, event):
# custom context menu
pass
def custom_method_A(self):
# add a custom method
pass
def custom_method_B(self):
# add a custom method
pass
You can create a class that implements the common functionality and then the buttons inherit from the item and the common class:您可以创建一个实现通用功能的类,然后按钮从项目和通用类继承:
from PyQt5 import QtCore, QtWidgets
class Foo:
def contextMenuEvent(self, event):
print("contextMenuEvent")
def custom_method_A(self):
print("custom_method_A")
def custom_method_B(self):
print("custom_method_B")
class MyRectButton(QtWidgets.QGraphicsRectItem, Foo):
pass
class MyEllipseButton(QtWidgets.QGraphicsEllipseItem, Foo):
pass
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
scene = QtWidgets.QGraphicsScene()
view = QtWidgets.QGraphicsView(scene)
it_rect = MyRectButton(QtCore.QRectF(-50, -30, 100, 100))
it_ellipse = MyEllipseButton(QtCore.QRectF(50, 50, 100, 100))
scene.addItem(it_rect)
scene.addItem(it_ellipse)
for it in (it_rect, it_ellipse):
it.custom_method_A()
it.custom_method_B()
view.resize(640, 480)
view.show()
sys.exit(app.exec_())
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