Python 是否可以在paint（）方法内绘制QGraphicsItem？

我正在创建QGraphicsItem的一个子类，这个子类有不同的地方供用户点击。 我的想法是，单击每个组件，创建一个替换了MousePresseEvent的QGraphicsItem子类。问题是如何将此组件合并到QGraphicItem的子类中

下面是我正在尝试的代码，但我不知道如何显示paint方法中的所有组件

# -*- coding: utf-8 -*-
from PySide import QtGui, QtCore

class GraphicItemMain(QtGui.QGraphicsItem):
    
    def __init__(self, x, y):
        super(GraphicItemMain, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 100, 100)

    def paint(self, painter, option, widget):
        textComponent = GraphicItemTextClicked(5+self.x, 5+self.y)
        ellipseComponent = GraphicItemEllipseClicked(5+self.x, 50+self.y)
        # How do I print this components?

class GraphicItemTextClicked(QtGui.QGraphicsItem):
    
    def __init__(self, x, y):
        super(GraphicItemTextClicked, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y

    def mousePressEvent(self, event):
        #Do something
        QtGui.QGraphicsItem.mousePressEvent(self, event)

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 80, 30)

    def paint(self, painter, option, widget):
        painter.setPen(QtGui.QPen(QtGui.QColor(255, 0, 0), 1))
        font = QtGui.QFont()
        font.setPointSize(12)
        painter.setFont(font)
        painter.drawText(QtCore.QPointF(3+self.x, self.y), "Same Text")

class GraphicItemEllipseClicked(QtGui.QGraphicsItem):
    
    def __init__(self, x, y):
        super(GraphicItemEllipseClicked, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y

    def mousePressEvent(self, event):
        #Do other thing
        QtGui.QGraphicsItem.mousePressEvent(self, event)

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 25, 25)

    def paint(self, painter, option, widget):
        painter.setPen(QtGui.QPen(QtGui.QColor(0, 255, 0), 1))
        painter.drawEllipse(self.x, self.y, 25, 25)   
        

---

感谢@SimonHibbs，解决方案是在init方法上调用textComponent.setParentItem（self）和ellipseComponent.setParentItem（self）

解决方案：

from PySide import QtGui, QtCore

class GraphicItemMain(QtGui.QGraphicsItem):

    def __init__(self, x, y):
        super(GraphicItemMain, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y
        textComponent = GraphicItemTextClicked(5+self.x, 5+self.y)
        textComponent.setParentItem(self)
        ellipseComponent = GraphicItemEllipseClicked(5+self.x, 50+self.y)
        ellipseComponent.setParentItem(self)

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 100, 100)

    def paint(self, painter, option, widget):
        # Paint samething

class GraphicItemTextClicked(QtGui.QGraphicsItem):

    def __init__(self, x, y):
        super(GraphicItemTextClicked, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y

    def mousePressEvent(self, event):
        # Do something
        QtGui.QGraphicsItem.mousePressEvent(self, event)

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 80, 30)

    def paint(self, painter, option, widget):
        painter.setPen(QtGui.QPen(QtGui.QColor(255, 0, 0), 1))
        font = QtGui.QFont()
        font.setPointSize(12)
        painter.setFont(font)
        painter.drawText(QtCore.QPointF(3+self.x, self.y), "Same Text")

class GraphicItemEllipseClicked(QtGui.QGraphicsItem):

    def __init__(self, x, y):
        super(GraphicItemEllipseClicked, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y

    def mousePressEvent(self, event):
        # Do other thing
        QtGui.QGraphicsItem.mousePressEvent(self, event)

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 25, 25)

    def paint(self, painter, option, widget):
        painter.setPen(QtGui.QPen(QtGui.QColor(0, 255, 0), 1))
        painter.drawEllipse(self.x, self.y, 25, 25)

---

感谢@SimonHibbs，解决方案是在init方法上调用textComponent.setParentItem（self）和ellipseComponent.setParentItem（self）

解决方案：

from PySide import QtGui, QtCore

class GraphicItemMain(QtGui.QGraphicsItem):

    def __init__(self, x, y):
        super(GraphicItemMain, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y
        textComponent = GraphicItemTextClicked(5+self.x, 5+self.y)
        textComponent.setParentItem(self)
        ellipseComponent = GraphicItemEllipseClicked(5+self.x, 50+self.y)
        ellipseComponent.setParentItem(self)

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 100, 100)

    def paint(self, painter, option, widget):
        # Paint samething

class GraphicItemTextClicked(QtGui.QGraphicsItem):

    def __init__(self, x, y):
        super(GraphicItemTextClicked, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y

    def mousePressEvent(self, event):
        # Do something
        QtGui.QGraphicsItem.mousePressEvent(self, event)

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 80, 30)

    def paint(self, painter, option, widget):
        painter.setPen(QtGui.QPen(QtGui.QColor(255, 0, 0), 1))
        font = QtGui.QFont()
        font.setPointSize(12)
        painter.setFont(font)
        painter.drawText(QtCore.QPointF(3+self.x, self.y), "Same Text")

class GraphicItemEllipseClicked(QtGui.QGraphicsItem):

    def __init__(self, x, y):
        super(GraphicItemEllipseClicked, self).__init__()
        self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
        self.setFlag(QtGui.QGraphicsItem.ItemIsFocusable, True)
        self.setAcceptsHoverEvents(True)
        self.x = x
        self.y = y

    def mousePressEvent(self, event):
        # Do other thing
        QtGui.QGraphicsItem.mousePressEvent(self, event)

    def boundingRect(self):
        return QtCore.QRectF(self.x, self.y, 25, 25)

    def paint(self, painter, option, widget):
        painter.setPen(QtGui.QPen(QtGui.QColor(0, 255, 0), 1))
        painter.drawEllipse(self.x, self.y, 25, 25)

---

您能更好地解释一下吗？您不需要在父QGraphicsItem paint方法中执行任何操作来显示子对象。这是在他们自己的绘制方法中处理的。将子项添加到父项的_init__方法中，而不是在paint方法中。否则每次调用paint（）时都会再次添加新的子项。感谢@SimonHibbs，解决方案是在init方法上调用textComponent.setParentItem（self）和ellipseComponent.setParentItem（self）。您能更好地解释一下吗？您不需要在父QGraphicsItem paint方法中执行任何操作来显示子项。这是在他们自己的绘制方法中处理的。将子项添加到父项的_init__方法中，而不是在paint方法中。否则每次调用paint（）时都会再次添加新的子项。感谢@SimonHibbs，解决方案是在init方法上调用textComponent.setParentItem（self）和ellipseComponent.setParentItem（self）。