QGraphicsScene on a QMainWindow

Question

Python还是新手，所以我试图让QGraphicsScene在QMainWindow中。 现在我编码的方式是会出现两个窗口，但我只希望一个窗口与QMainWindow"内部"的QGraphicsScene一起出现。 这是我的代码：

import sys
from PyQt4 import QtGui, QtCore
class MyView(QtGui.QGraphicsView):
    def __init__(self):
        QtGui.QGraphicsView.__init__(self)
        self.scene = QtGui.QGraphicsScene(self)
        self.item = QtGui.QGraphicsRectItem(300,400,100,100)
        self.scene.addItem(self.item)
        self.setScene(self.scene)
class Window(QtGui.QMainWindow):
    def __init__(self):
        #This initializes the main window or form
        super(Window,self).__init__()
        self.setGeometry(50,50,900,700)
        self.setWindowTitle("Pre-Alignment system")
def run():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    view = MyView()
    view.show()
    sys.exit(app.exec_())
run()

非常感谢！

Answer 1

Qt（和其他GUI工具包）相信育儿。在另一个窗口中有一个窗口或小部件，设置其父级。请注意，您应该在外部调用显示。

import sys
from PyQt4 import QtGui, QtCore
class MyView(QtGui.QGraphicsView):
    def __init__(self, parent=None):
        QtGui.QGraphicsView.__init__(self, parent=parent)
        self.scene = QtGui.QGraphicsScene(self)
        self.item = QtGui.QGraphicsRectItem(300,400,100,100)
        self.scene.addItem(self.item)
        self.setScene(self.scene)
class Window(QtGui.QMainWindow):
    def __init__(self, parent=None):
        #This initializes the main window or form
        super(Window,self).__init__(parent=parent)
        self.setGeometry(50,50,900,700)
        self.setWindowTitle("Pre-Alignment system")
def run():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    view = MyView(GUI)
    GUI.show()
    sys.exit(app.exec_())
run()

Answer 2

你必须在QMainWindow中创建你的QGraphicsScene（就像你想要它出现一样）

然后，总的来说，您只创建一个Window实例并显示它。

class Window(QtGui.QMainWindow):
    def __init__(self):
        #This initializes the main window or form
        super(Window,self).__init__()
        self.setGeometry(50,50,900,700)
        self.setWindowTitle("Pre-Alignment system")
        #create the view
        self.view=MyView()
        self.setCentralWidget(self.view)
if __name__=='__main__':
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    GUI.show()
    sys.exit(app.exec_())