[reportlab-users] Subclassing BaseDocTemplate

[Robin Becker]

Robin Becker wrote:
> Nicholas Wieland wrote:
> 
>> Hi *, I want to subclass BaseDocTemplate as suggested in this list, to 
>> use handle_pageBegin and similar methods.
>>  
>>  
>>
> 
> Your approach to subclassing is incorrect. You need to call your base 
> methods eg
> untested translation of your original with beforePage substituted for 
> handle_pageBegin
> 
> NB we have only one fixed arg in __init__ so *args went. Also I changed 
> the forwarding of kwds in the base class __init__. We need to add self 
> explicitly as the first argument.
> 
> class IReportDocTemplate(BaseDocTemplate):
>   def __init__ (self, ptf_data,**kwds):
>     BaseDocTemplate.__init__(self,
>       filename = ptf_data ['ptf_code'] + '_' + str (ptf_data 
> ['reference_date']).replace ('/', ''),
>       **kwds)
>     self.dossier_number = ptf_data ['dossier_number']
>     self.reference_date = ptf_data ['reference_date']
> 
>   def beforePage(self):
>     BaseDoctemplate.beforePage(self)
>     self.canv.saveState ()
>     logo = Image.open (_product_home + "/images/logompsam.gif")
>     self.canv.drawInlineImage (logo, 6, defaultPageSize [1] - 30, width 
> = 100, height = 25)


>     canvas.setFont('Tahoma', 12)
>     canvas.drawCentredString (defaultPageSize [0] // 2, defaultPageSize 
> [1] - 25,
>       "Dossier n.: " + self.dossier_number)


obviously the above should really be self.canv which I just noticed.

>     y, m, d = str (self.reference_date).split ("/")
>     d = datetime.date (int (y), int (m), int (d))
>     self.canv.drawCentredString (defaultPageSize [0] - 60, 
> defaultPageSize [1] - 25,
>       d.strftime ("%B %d, %Y"))
>     self.canv.restoreState ()
> 
>   def build (self, flowables):
>     self._calc()
>     self.build(self, flowables)
> 
> 
......


-- 
Robin Becker