Mastering GUI Programming with Python

Building InvoiceView

The InvoiceView class is where all the hard work takes place; we will base it on a read-only QTextEdit widget, and it will contain a build_invoice() method that, when called with a dictionary of data, will construct a formatted invoice document using the Qt Scribe framework.

Let's start with the constructor, as shown in the following example:

class InvoiceView(qtw.QTextEdit):    dpi = 72    doc_width = 8.5 * dpi    doc_height = 11 * dpi    def __init__(self):        super().__init__(readOnly=True)        self.setFixedSize(qtc.QSize(self.doc_width, self.doc_height))

To begin, we've defined class variables for the document's width and height. We've chosen these values to give us the aspect ratio of a standard US letter-sized document at a reasonable ...