doctemplate.py 文件源码

def build(self,flowables,onFirstPage=_doNothing, onLaterPages=_doNothing, canvasmaker=canvas.Canvas):
        """build the document using the flowables.  Annotate the first page using the onFirstPage
               function and later pages using the onLaterPages function.  The onXXX pages should follow
               the signature

                  def myOnFirstPage(canvas, document):
                      # do annotations and modify the document
                      ...

               The functions can do things like draw logos, page numbers,
               footers, etcetera. They can use external variables to vary
               the look (for example providing page numbering or section names).
        """
        self._calc()    #in case we changed margins sizes etc
        frameT = Frame(self.leftMargin, self.bottomMargin, self.width, self.height, id='normal')
        self.addPageTemplates([PageTemplate(id='First',frames=frameT, onPage=onFirstPage,pagesize=self.pagesize),
                        PageTemplate(id='Later',frames=frameT, onPage=onLaterPages,pagesize=self.pagesize)])
        if onFirstPage is _doNothing and hasattr(self,'onFirstPage'):
            self.pageTemplates[0].beforeDrawPage = self.onFirstPage
        if onLaterPages is _doNothing and hasattr(self,'onLaterPages'):
            self.pageTemplates[1].beforeDrawPage = self.onLaterPages
        BaseDocTemplate.build(self,flowables, canvasmaker=canvasmaker)