mpl_canvas.py

import matplotlib
from matplotlib.figure import Figure

# Import Qt and matplotlib modules
try:
    from PyQt5.QtWidgets import QSizePolicy
    from PyQt5.QtGui import QPalette
    matplotlib.use("Qt5Agg")
    from matplotlib.backends.backend_qt5agg import (FigureCanvasQTAgg
                                                    as FigureCanvas)
except ImportError:
    from PyQt4.QtGui import QPalette, QSizePolicy
    matplotlib.use("Qt4Agg")
    from matplotlib.backends.backend_qt4agg import (FigureCanvasQTAgg
                                                    as FigureCanvas)


class MplCanvas(FigureCanvas):

    def __init__(self, parent=None):
        fig = Figure()
        super(MplCanvas, self).__init__(fig)
        self.setParent(parent)
        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        self.updateGeometry()

    def setParent(self, parent):
        super(MplCanvas, self).setParent(parent)
        if parent:
            color = parent.palette().brush(QPalette.Window).color()
            self.figure.set_facecolor("#%X%X%X" % (color.red(),
                                                   color.green(),
                                                   color.blue()))