# Qt sizeHint

Dear List

I am a really newbie in Python, Matlibplot and Qt but I am still making huge progress in my project.

I am now stuck trying to make a custom widget for Qt Desginer using matplotlib to display a Latex formula. I would like the Latex label to provide Qt with the correct size, with enough space to fit the text and nothing else.

I know from Qt that I should re implement the sizeHint method but I don’t know how to get the minimum size.

I tried the get_window_extent() but I need a renderer for that.

Any idea?

This is what I have so far

from PyQt4 import QtGui
from PyQt4 import QtCore
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class MplCanvas(FigureCanvas):

def __init__(self):
self.fig = Figure(linewidth=0)
FigureCanvas.__init__(self, self.fig)
self._text = r'$\alpha > \beta$'
self._g = self.fig.suptitle(self._text)

FigureCanvas.setSizePolicy(self,
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)

def sizeHint(self):

print(self._g.get_window_extent())

return QtCore.QSize(something1, something2)


class Plot2D(QtGui.QWidget):
def init(self, parent = None):

    QtGui.QWidget.__init__(self, parent)
self.canvas = MplCanvas()
self.vbl = QtGui.QVBoxLayout()

import sys