mapcanvas.py

        if self.mShowTitles and self.mShow:
            painter.setPen(Qt.blue);
            painter.setFont(QFont("Arial", 30))

            for canvas, t in self.mCanvasExtents.items():
                ext, geom = t
                ULpx = self.toCanvasCoordinates(ext.center())
                txt = canvas.windowTitle()
                painter.drawLine(0, 0, 200, 200);
                painter.drawText(ULpx,  txt)


    def setShow(self, b):
        assert isinstance(b, bool)
        self.mShow = b

    def setShowTitles(self, b):
        assert isinstance(b, bool)
        self.mShowTitles = b