打印图形的PyQt滚动区域未更新

Question

我是PyQt4的新手，正在尝试构建用于创建电路的GUI。我使用SchemDraw创建电路图，然后将其绘制到FigureCanvas，这是GUI的一部分。很好用。我还创建了一个按钮，将一个组件添加到电路中。这也是可行的。不幸的是，保存电路的滚动区域没有更新大小/滚动条，因此电路变得比滚动区域大，因此没有正确显示。你知道吗

我添加了两个屏幕截图来显示行为：

初始情况

添加一些组件后的情况

我想要的是能够向左滚动，如果电路变宽。 有人有主意吗？你知道吗

我的代码：

import sys
from PyQt4 import QtGui

from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4agg import FigureManagerQT as Fig
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QT as NavigationToolbar
from matplotlib.figure import Figure
import PyQt4.QtCore as QtCore

import SchemDraw as schem
import SchemDraw.elements as e


class Window(QtGui.QApplication):
    def __init__(self, sys_argv):
        super(Window, self).__init__(sys_argv)

        screen_resolution = self.desktop().screenGeometry()
        width, height = screen_resolution.width(), screen_resolution.height()


        self.main_window = QtGui.QMainWindow()
        self.main_window.setWindowTitle('App')
        self.main_window.showMaximized()


        # set the layout
        containerMain = QtGui.QWidget()
        containerMain.setStyleSheet("background-color:lightGrey;")
        mainLayout = QtGui.QVBoxLayout(containerMain)

        containerGraph = QtGui.QWidget()
        containerGraph.setStyleSheet("background-color:lightGrey ;")
        graphLayout = QtGui.QVBoxLayout(containerGraph)


        containerCircuit = QtGui.QWidget()
        containerCircuit.setFixedWidth(width * 0.7)
        containerCircuit.setFixedHeight(height * 0.45)

        circuitLayout = QtGui.QVBoxLayout(containerCircuit)

        containerInput = QtGui.QWidget()
        containerInput.setStyleSheet("background-color:lightGrey ;")
        inputLayout = QtGui.QVBoxLayout(containerInput)

        containerUpperLayout = QtGui.QWidget()
        containerUpperLayout.setStyleSheet("background-color:lightGrey;")
        upperLayout = QtGui.QHBoxLayout(containerUpperLayout)

        containerLowerLayout = QtGui.QWidget()
        containerLowerLayout.setStyleSheet("background-color:lightGrey ;")
        lowerLayout = QtGui.QHBoxLayout(containerLowerLayout)


        #----------------------------Graph-Layout----------------------------#

        self.figure = Figure()

        self.canvas = FigureCanvas(self.figure)

        graphLayout.addWidget(self.canvas)

        #----------------------------Circuit-Layout----------------------------#
        self.circuitDrawing = schem.Drawing()  
        self.circuitDrawing.push()

        self.circuitFigure = Figure()
        self.circuitCanvas = FigureCanvas(self.circuitFigure)
        self.drawCircuit()

        self.scrollArea = QtGui.QScrollArea()
        self.scrollArea.setWidget(self.circuitCanvas)


        buttonDummy1 = QtGui.QPushButton('Add Element to Circuit')
        buttonDummy2 = QtGui.QPushButton('Button')
        buttonDummy1.clicked.connect(self.drawCircuit)


        circuitLayout.addWidget(self.scrollArea)

        circuitLayout.addWidget(buttonDummy1)
        circuitLayout.addWidget(buttonDummy2)


        #----------------------------Input-Layout----------------------------#

        buttonDummy3 = QtGui.QPushButton('Button')
        buttonDummy3.setFixedSize(50,50)
        buttonDummy4 = QtGui.QPushButton('Button')
        buttonDummy4.setFixedSize(50,50)

        inputLayout.addWidget(buttonDummy3)
        inputLayout.addWidget(buttonDummy4)

        inputLayout.setContentsMargins(50,50,50,50)


        #----------------------------Main-Layout----------------------------# 

        upperLayout.addWidget(containerCircuit)
        upperLayout.addWidget(containerInput)


        lowerLayout.addWidget(containerGraph)

        mainLayout.addWidget(containerUpperLayout)
        mainLayout.addWidget(containerLowerLayout)       

        self.main_window.setCentralWidget(containerMain)


    def drawCircuit(self):
        self.circuitDrawing.add(e.RBOX)

        ax = self.circuitFigure.add_subplot(111)

        # discards the old graph
        ax.clear()

        # plot data
        self.circuitDrawing.draw(ax = ax)
        # refresh canvas
        self.circuitCanvas.draw()  


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)

    main = Window(sys.argv)

    sys.exit(app.exec_())

更新信息： 如果我加上一行self.scrollArea.setWidgetResizable可调整大小（对），图形占据了孔区域，但是水平滚动的滚动条也没有出现。你知道吗

如果我将固定大小设置为自行电路板，我得到一个水平滚动条，但它不会更新，如果电路越来越大。你知道吗