Splitting tables with repeated ROWBACKGROUNDS

"Axel P. Kielhorn" <[email protected]> Sat, 21 Mar 2020 11:54:38 +0100

Newsgroups	gmane.comp.python.reportlab.user
Message-ID	<[email protected]>

Hello!

I have some data that I want to put into a table, but it doesn’t fit into one row.
Therefore I split it into two rows and use ROWBACKGROUNDS to group the rows.

This works great until I have to split the table.
(Well reportlab splits the table for me.)

Sometimes, depending on the start position on the page, a table break will occur inside a double row.
This means the grouping on the following page is wrong.

Is there a way to influence the table break?
(Every second (or nth) row)

An alternative would be to SPAN the first column, hoping the table won’t break a SPAN.
But this means I have to track my data and add a TABLESTYLE for each double row.

Right now I simply throw my data at the table and hope for the best.

Please find included an example of what I’m doing right now.

Greetings
Axel

rl-ecm.py (text/x-python-script, 3.2 KB)

from reportlab.platypus import SimpleDocTemplate, Table
from reportlab.platypus.tables import TableStyle
from reportlab.rl_config import defaultPageSize
from reportlab.lib.units import mm
from reportlab.lib import colors
from reportlab.pdfgen import canvas

Data = [
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e"),
    ("Line1a", "Line1e"),
    ("Line1a", "Line1e"),
    ("Line2a", "Line2e"),
    ("Line2a", "Line2e")
]

Elements = []

# Abwechselnd 2 weiß / 2 grau
TableBaseStyleD = TableStyle([('ROWBACKGROUNDS', (0, 0), (-1, -1),
                               [colors.white, colors.white,
                                colors.lightgrey, colors.lightgrey])])

# Abwechselnd 2 weiß / 2 grau Schrift 9 pt mit Trennlinien
TableStyleLD = TableStyle(TableBaseStyleD.getCommands())
TableStyleLD.add('LINEBEFORE', (1, 0), (-1, -1), 1, colors.darkgrey)
TableStyleLD.add('BOTTOMPADDING', (0, 0), (-1, -1), 2)  # 3
TableStyleLD.add('TOPPADDING', (0, 0), (-1, -1), 2)  # 3
TableStyleLD.add('FONTSIZE', (0, 0), (-1, -1), 9)
TableStyleLD.add('LEADING', (0, 0), (-1, -1), 10)

# Header
bdata = [["Anfang", "Ende"]]
bdata.append(["", ""])

# Data
for line in Data:
    an, en = line
    bdata.append([an, en])

bt = Table(bdata, repeatRows=2)
bt.setStyle(TableStyleLD)

Elements.append(bt)

PAGE_WIDTH = defaultPageSize[0]  # ist A4
PAGE_HEIGHT = defaultPageSize[1]  # ist A4
TOP_MARGIN = 30 * mm
BOTTOM_MARGIN = 40 * mm


def myFirstPage(canvas, doc):
    canvas.saveState()
    canvas.setStrokeColor(colors.red)
    canvas.line(250, BOTTOM_MARGIN, 250, PAGE_HEIGHT - TOP_MARGIN)
    canvas.restoreState()


doc = SimpleDocTemplate("testpdf.pdf",
                        title="Title",
                        author="Author",
                        # keywords=PDFKeywords,
                        topMargin=TOP_MARGIN,
                        leftMargin=20 * mm,
                        rightMargin=20 * mm,
                        # showBoundary = 1,
                        bottomMargin=BOTTOM_MARGIN
                        )
doc.build(Elements, onFirstPage=myFirstPage, onLaterPages=myFirstPage,
          canvasmaker=canvas.Canvas)