report_builder.py 文件源码

def set_header_footer(self, canvas, doc):
        """
        Set header and footer on each page; default is NO header and footer with
        a page no.
        """
        # Save canvas
        canvas.saveState()
        page_num = canvas.getPageNumber()
        # Header
        if self.page_header:
            header = Paragraph(self.page_header, self.styles['page_header'])
            w, h = header.wrap(doc.width, doc.topMargin)
            header.drawOn(canvas, doc.leftMargin, doc.height + doc.topMargin - h)
        # Footer
        _footer = self.page_footer or "Pg. %s" % page_num
        footer = Paragraph(_footer, self.styles['page_footer'])
        w, h = footer.wrap(doc.width, doc.bottomMargin)
        footer.drawOn(canvas, doc.leftMargin, h)
        # Release the canvas
        canvas.restoreState()