Bạn nên chuyển sang cấp độ tiếp theo và sử dụng DocTemplates. Hình ảnh khá dễ dàng, nhưng việc sử dụng đạn thật sự rất khó - bạn phải xác định kiểu dáng và hơn thế nữa!
tôi sử dụng một tập các lớp như sau:
# -*- coding: utf-8 -*-
from django.utils.encoding import smart_str
from reportlab.lib.colors import Color
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import StyleSheet1, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.pdfgen import canvas
from reportlab.platypus.doctemplate import BaseDocTemplate, PageTemplate, \
_doNothing
from reportlab.platypus.frames import Frame
from reportlab.platypus.paragraph import Paragraph
import copy
import re
from reportlab.platypus.flowables import KeepTogether, Image, PageBreak
from htmlentitydefs import name2codepoint
from atom.http_core import HttpResponse
import tempfile
def htmlentitydecode(s):
return re.sub('&(%s);' % '|'.join(name2codepoint), lambda m: smart_str(unichr(name2codepoint[m.group(1)])), s)
PS = ParagraphStyle
stylesheet = StyleSheet1()
stylesheet.add(PS(name='Normal',
leading=15))
stylesheet.add(PS(name='Bullet',
parent=stylesheet['Normal'],
bulletFontName = 'Symbol',
bulletIndent = 0,
bulletFontSize = 13,
bulletColor = Color(0.93,0,0),
bulletOffsetY = -1.5,
leftIndent = 15.8,
firstLineIndent = 0,
), alias='bu')
stylesheet.add(PS(name='Heading1',
parent=stylesheet['Normal'],
fontSize=18,
spaceAfter=23.5), alias='h1')
stylesheet.add(PS(name='Heading2',
parent=stylesheet['Normal'],
fontSize=14,
spaceAfter=4), alias='h2')
stylesheet.add(PS(name='Heading3',
parent=stylesheet['Normal'],
textColor=Color(0.93,0,0)
), alias='h3')
stylesheet.add(PS(name='Heading4',
parent=stylesheet['Heading3'],
textColor='black'), alias='h4')
BulletStyle = copy.deepcopy(stylesheet["Bullet"])
H1Style = copy.deepcopy(stylesheet["Heading1"])
H2Style = copy.deepcopy(stylesheet["Heading2"])
H3Style = copy.deepcopy(stylesheet["Heading3"])
H4Style = copy.deepcopy(stylesheet["Heading4"])
NormalStyle = copy.deepcopy(stylesheet["Normal"])
top_margin = A4[1] - 1.22*cm
bottom_margin = 1.5*cm
left_margin = 2.8*cm
frame_width = 17.02*cm
right_margin = left_margin + frame_width
frame_height = 22.7*cm
letter_top_margin = 25.0*cm
letter_bottom_margin = 3.0*cm
letter_left_margin = 2.5*cm
letter_right_margin = A4[0] - 2.5*cm
letter_frame_width = A4[0] - 5.0*cm
letter_frame_height = letter_top_margin - letter_bottom_margin
class LetterTemplate(BaseDocTemplate):
_invalidInitArgs = ('pageTemplates',)
def handle_pageBegin(self):
self._handle_pageBegin()
self._handle_nextPageTemplate('First')
def build(self, flowables, onFirstPage=_doNothing, canvasmaker=canvas.Canvas):
self._calc()
frameT = Frame(letter_left_margin, letter_bottom_margin, letter_frame_width, letter_frame_height,
leftPadding=0, bottomPadding=0, rightPadding=0, topPadding=0,
id='normal')
self.addPageTemplates([PageTemplate(id='First',frames=frameT, onPage=onFirstPage, pagesize=self.pagesize)])
if onFirstPage is _doNothing and hasattr(self,'onFirstPage'):
self.pageTemplates[0].beforeDrawPage = self.onFirstPage
BaseDocTemplate.build(self, flowables, canvasmaker=canvasmaker)
class PdfA4Letter(object):
def __init__(self, filename):
self.title = filename
self._keep_together = False
self.elements = []
self._keep_together_elements = []
self.doc = LetterTemplate(filename,showBoundary=False)
self.elements = []
def _process_text(self, txt):
text_elems = []
# avoid us from user added html.
txt = txt.replace('<','⟨').replace('>','⟩')
txt = htmlentitydecode(smart_str(txt).replace('<p>', '').replace('</p>', '<br />'))
# @todo: in some case the reegxp does not work -> hack
txt = txt.replace('target="_blank"', '')
# process text
for part in re.split('<ul>|</ul>|<ol>|</ol>', txt):
part = part.strip()
if part.count('<li>') > 0:
for item in re.split('<li>|</li>', part):
item = item.strip()
if len(item) > 0:
text_elems.append(Paragraph(item, BulletStyle, bulletText=u'•'))
else:
text_elems.append(Paragraph(part, NormalStyle))
return text_elems
def _store_flowable(self, flowable):
if self._keep_together == False:
self.elements.append(flowable)
else:
self._keep_together_elements.append(flowable)
def start_keep_together(self):
self.end_keep_together()
self._keep_together = True
def end_keep_together(self):
self._keep_together = False
if len(self._keep_together_elements) > 0:
e = self._keep_together_elements
self.elements.append(KeepTogether(e))
self._keep_together_elements = []
def newPage(self):
self._store_flowable(PageBreak())
def blankline(self, cnt=1):
self.text(cnt*'<br/>')
def text(self, txt):
for e in self._process_text(txt):
self._store_flowable(e)
def image(self, name, width, height, halign='CENTER'):
im = Image(name, width=width, height=height)
im.hAlign = halign
self._store_flowable(im)
def h1(self, txt, add_to_toc=True):
self.newPage()
self._store_flowable(Paragraph(txt, H1Style))
def h2(self, txt, add_to_toc=True):
self._store_flowable(Paragraph(txt, H2Style))
def h3(self, txt, add_to_toc=False):
self._store_flowable(Paragraph(txt, H3Style))
def h4(self, txt, add_to_toc=False):
self._store_flowable(Paragraph(txt, H4Style))
def _drawPage(self, canvas, doc):
canvas.setSubject('Letter Subject')
canvas.setTitle('Letter Title')
canvas.setAuthor('Me')
def build(self):
# flush elems
self.end_keep_together()
self.doc.build(self.elements, self._drawPage)
Sau đó, bạn có thể xử lý thế hệ pdf theo quan điểm của bạn, như thế này:
def view(request):
file = tempfile.NamedTemporaryFile()
e = PdfA4Letter(file.name)
ref = '/absolute/path/to/image.png'
e.image(ref, width=frame_width, height=10*cm)
e.h1((u'Über Mich'))
e.h3('Next header')
t = """
ascasc<br />
ascascasc<br />
<ul>
<li>sdv1</li>
<li>sdv2</li>
<li>sdv3</li>
</ul>
ascasc<br />
ascasc<br />
"""
e.text(t)
e.blankline(2)
e.end_keep_together()
e.build()
response = HttpResponse(mimetype='application/pdf')
response['Content-Disposition'] = 'attachment; filename=gugus.pdf'
response.write(file.read())
file.close()
return response