ReportLab: Flowable too large on page 1 in frame 'normal' of template 'First'
I build PDF using ReportLab. My program has a MyDocTemplate(SimpleDocTemplate)
class with two methods: beforePage(self)
and afterPage(self)
which add hea开发者_StackOverflowder and footer (as PNG image) on every page. There is also a MyDocStyle
class which describe ParagraphStyle
.
Main method looks like this:
TITLE = Paragraph(Title, MyDocStyle.h1)
TO = Paragraph(To, MyDocStyle.h2)
FROM = Paragraph(From, MyDocStyle.h2)
SUBJECT = Paragraph(Subject, MyDocStyle.h2)
LONG_PARAGRAPH = Paragraph(Text, MyDocStyle.h3)
...
Elements = [TITLE, TO, FROM, SUBJECT, LONG_PARAGRAPH, ...]
doc = MyDocTemplete('output.pdf', pagesize=A4,
leftMargin=2*cm, rightMargin=2*cm,
topMargin=4*cm, bottomMargin=4*cm)
doc.build(Elements)
Data comes from CSV files and GUI. From time to time (depends on data length) I receive an error:
Flowable <Spacer at 0x2631120 frame=normal>...(1 x 5.66929133858) too large
on page 1 in frame 'normal'(469.88976378 x 603.118110236) of template 'First'
This exception stop my program. For short Paragraphs I set in MyDocStyle
class h2.keepWithNext = 1
however it's not perfect solution. ReportLab split correctly long paragraph if end of paragraph does not "coincide" with end of page (text area).
How can I deal with it?
This error occurs when ReportLab try to split a Spacer over two pages. It seems that the only way to workaround this issue is wrap your Spacer into a KeepTogether element:
elements.append(KeepTogether(Spacer(width, height)))
Solved. Don't use Spacer
(e.g. Spacer(1, 0.2*cm)
) as a separator for Paragraph
. Instead, define spaceBefore
and spaceAfter
in ParagraphStyle
, for example:
ParagraphStyle(name = 'Normal',
fontName = "Verdana",
fontSize = 11,
leading = 15,
alignment = TA_JUSTIFY,
allowOrphans = 0,
spaceBefore = 20,
spaceAfter = 20,
wordWrap = 1)
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