在更改qlistwidget中的行后使用matplotlib绘图

Question

我想在点击行后绘制图表。传输信号，但不绘制图表。但如果我从self.hist()调用绘图函数（MyPlot.__init__），则会绘制图表。

我用这个作为例子，但它没有帮助。 How to embed matplotib in pyqt - for Dummies

import sys
from PyQt4 import QtGui
from PyQt4 import QtCore
from PyQt4.QtCore import QCoreApplication, Qt
from PyQt4.QtGui import QListWidget, QListWidgetItem, QApplication, QMessageBox
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QT as NavigationToolbar
from matplotlib.figure import Figure
import sqlite3
matplotlib.style.use('ggplot')
import pandas as pd
import numpy as np

# my plotting functions are in this class
class Myplot(FigureCanvas):
    def __init__(self, parent=None):
        self.fig = Figure()
        FigureCanvas.__init__(self, self.fig)
        #self.hist()    

#this and next functions should plot
    def compute_initial_figure(self):
        self.axes = self.fig.add_subplot(1,1,1)
        self.axes.hold(False)
        self.axes.plot(np.random.rand(400))
        self.draw()
    def hist(self):
        tm = pd.Series(np.random.randn(500), index=pd.date_range('1/1/2005', periods=500))
        self.axes = self.fig.add_subplot(1,1,1)
        self.axes.hold(False)
        tm = tm.cumsum()
        self.axes.plot(tm)
        self.draw()

#list with rows. I want to draw charts after clicking on them
class Panel (QtGui.QListWidget):
    def __init__(self, parent=None):
        QtGui.QListWidget.__init__(self)
        self.row1 = "COMMISSIONS & FEES"
        self.addItem(self.row1)
        row2 = "NET LIQUIDATING VALUE"
        self.addItem(row2)
        self.setFixedWidth(200)
        self.itemClicked.connect(self.Clicked)

#this function sends signal to the plotting functions
    def Clicked(self):
        mplot=Myplot()
        index=self.currentRow()
        if index == 0:
            print '0000'
            mplot.compute_initial_figure()
        if index == 1:
            print '1111'
            mplot.hist()

class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.initUI()

    def initUI(self):
        #menu
        exitAction = QtGui.QAction(QtGui.QIcon('Stuff/exit.png'), '&Exit', self)        
        exitAction.setShortcut('Ctrl+Q')
        exitAction.setStatusTip('Exit application')
        exitAction.triggered.connect(QtGui.qApp.quit)

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('&File')        

        self.statusBar().showMessage('Ready')
        self.showMaximized()
        self.setMinimumSize(600, 400)
        self.setWindowTitle('ESPA')
        self.setWindowIcon(QtGui.QIcon('Stuff/icon.png.'))

        #setup window widgets
        self.main_widget= QtGui.QWidget(self)
        #lines up widgets horizontally
        layout = QtGui.QHBoxLayout(self.main_widget)
        mp=Myplot(self.main_widget)
        p=Panel(self.main_widget)
        layout.addWidget(p)
        layout.addWidget(mp)
        self.main_widget.setFocus()

        self.setCentralWidget(self.main_widget)

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec_())