是否可以在 paint() 方法中绘制 QGraphicsItem ？

Question

我正在创建 QGraphicsItem 的子类，这个子类有不同的地方可供用户点击。我的想法是为每个单击的组件创建一个替换为 mousePressEvent 的 QGraphicsItem 的子类。问题是如何将这个组件合并到 QGraphicItem 的子类中。

这是我正在尝试的代码，但我不知道如何在 paint 方法中显示所有组件。

# -*- 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)

Answer 1

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)

是否可以在 paint() 方法中绘制 QGraphicsItem ？

Is it possible to paint a QGraphicsItem inside the paint() method?

python

qt

pyqt

qt4

pyside