References in document all point to Page 1 after adding page numbering footer

[Oliver Angelil]

Hi all

Thanks for this great piece of software.

After adding a FooterCanvas class to add page numbering, and passing it into doc.multiBuild, all hyperlink references in the contents page point to Page 1. 

Code:

from datetime import datetime

from reportlab.pdfgen import canvas

from reportlab.platypus.doctemplate import PageTemplate, BaseDocTemplate

from reportlab.platypus.frames import Frame

from reportlab.lib.units import cm, mm

from reportlab.platypus import Paragraph, Spacer, PageBreak

from reportlab.platypus.tableofcontents import TableOfContents

from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle

from reportlab.lib import colors

from reportlab.lib.pagesizes import LETTER

class FooterCanvas(canvas.Canvas):

def __init__(self, *args, **kwargs):

canvas.Canvas.__init__(self, *args, **kwargs)

self.pages = []

def showPage(self):

self.pages.append(dict(self.__dict__))

self._startPage()

def save(self):

page_count = len(self.pages)

for page in self.pages:

self.__dict__.update(page)

if (self._pageNumber > 1):

self.draw_canvas(page_count)

canvas.Canvas.showPage(self)

canvas.Canvas.save(self)

def draw_canvas(self, page_count):

page = f"Page {self._pageNumber} of {page_count}"

x = 128

self.saveState()

self.setStrokeColorRGB(0, 0, 0)

self.setLineWidth(0.5)

self.line(66, 78, LETTER[0] - 66, 78)

self.setFont('Helvetica', 10)

self.drawString(LETTER[0]-x, 65, page)

self.restoreState()

class MyDocTemplate(BaseDocTemplate):

def __init__(self, filename, **kw):

self.allowSplitting = 0

BaseDocTemplate.__init__(self, filename, **kw)

template = PageTemplate('normal', [Frame(2.5*cm, 2.5*cm, 15*cm, 25*cm, id='F1')])

self.addPageTemplates(template)

def afterFlowable(self, flowable):

"Registers TOC entries."

if flowable.__class__.__name__ == 'Paragraph':

text = flowable.getPlainText()

style = flowable.style.name

if style == 'Heading1':

self.notify('TOCEntry', (0, text, self.page))

if style == 'Heading2':

key = 'h2-%s' % self.seq.nextf('heading2')

self.canv.bookmarkPage(key)

self.notify('TOCEntry', (1, text, self.page, key))

if style == 'Heading3':

key = 'h3-%s' % self.seq.nextf('heading3')

self.canv.bookmarkPage(key)

self.notify('TOCEntry', (2, text, self.page, key))

timestamp_now = datetime.now().strftime("%Y-%m-%dT%H_%M_%S")

date_now = datetime.now().strftime("%d.%m.%Y")

doc = MyDocTemplate(

filename=f"/Volumes/sf_feature_branch_oliver/frlo/pdfs/FRLO_PL02_{timestamp_now}.pdf",

author="Oliver Angelil"

)

# Define styles

styles = getSampleStyleSheet()

content = []

# Add title to the PDF

title = Paragraph(text="FRLO Line 22", style=styles["Title"])

content.append(title)

content.append(Spacer(width=0 * cm, height=15 * cm))

content.append(Paragraph(text="Authors", style=styles['h4']))

for author in ["Oliver Angelil", "Emile Kelkboom", "Tim D'haese"]:

author_para = Paragraph(author, styles["Italic"])

content.append(author_para)

content.append(Spacer(width=0 * cm, height=4 * cm))

date_para = Paragraph(

text=f"Document Compiled on {date_now}",

style=ParagraphStyle(name='centered_date', parent=styles["h4"], alignment=1)

)

content.append(date_para)

# Add a table of contents

content.append(PageBreak())

#content.append(Paragraph('<a name="MYANCHOR"/><font color="white">here</font>', style=styles['Heading6']))

toc = TableOfContents()

toc.levelStyles = [

toc.getLevelStyle(0),

ParagraphStyle(name='blue_hyperlinks', parent=toc.getLevelStyle(1), textColor=colors.blue),

ParagraphStyle(name='blue_hyperlinks', parent=toc.getLevelStyle(2), textColor=colors.blue)

]

content.append(toc)

content.append(PageBreak())

content.append(Paragraph(text="This is an h1 heading", style=styles['Heading1']))

content.append(Paragraph(text="This is an h2 heading", style=styles['Heading2']))

content.append(PageBreak())

content.append(Paragraph(text="This is an h3 heading", style=styles['Heading3']))

content.append(PageBreak())

content.append(Paragraph(text="This is an h2 heading", style=styles['Heading2']))

content.append(Paragraph(text="This is an h3 heading", style=styles['Heading3']))

doc.multiBuild(story=content, canvasmaker=FooterCanvas)

Thank you very much in advance,

Oliver