在 PDF 页面上拆分 ReportLab 表(并排)? [英] Splitting ReportLab table across PDF page (side by side)?

问题描述

下面的代码创建了一个很好的测试表，其中包含 99 行数据和一个在每个分页符处重复的标题.桌子很窄，所以我想弄清楚如何将它拆分，以便在第一页的左侧有 1-37 行，在第一页的右侧有 38-74 行，以及第二页左侧的第 75-99 行.我称之为在页面上拆分表格"，但可能有更好的名称来说明我正在尝试做的事情，所以我希望我已经准确地描述了它.

The code below creates a nice test table with 99 rows of data and a header that gets repeated at each page break. The table is quite narrow so I am trying to figure out how to make it split so that it has rows 1-37 on the left hand side of the first page, rows 38-74 on the right hand side of the first page, and rows 75-99 on the left hand side of the second page. I've called this "splitting a table across a page" but there may be a better name for what I am trying to do so I hope I have described it accurately.

from reportlab.platypus import SimpleDocTemplate, Table, TableStyle, Paragraph, Frame, Spacer
from reportlab.lib import colors
from reportlab.lib.units import cm
from reportlab.lib.pagesizes import A3, A4, landscape, portrait
from reportlab.lib.styles import ParagraphStyle, getSampleStyleSheet
from reportlab.lib.enums import TA_LEFT, TA_RIGHT, TA_CENTER, TA_JUSTIFY
from reportlab.pdfgen import canvas

pdfReportPages = "C:\\Temp\\test.pdf"
doc = SimpleDocTemplate(pdfReportPages, pagesize=A4)

# container for the "Flowable" objects
elements = []
styles=getSampleStyleSheet()
styleN = styles["Normal"]

# Make heading for each column and start data list
column1Heading = "COL ONE"
column2Heading = "COL TWO"
# Assemble data for each column using simple loop to append it into data list
data = [[column1Heading,column2Heading]]
for i in range(1,100):
    data.append(["Col 1 Row " + str(i),"Col 2 Row " + str(i)])

tableThatSplitsOverPages = Table(data, [2.5 * cm, 2.5 * cm], repeatRows=1)
tableThatSplitsOverPages.hAlign = 'LEFT'
tblStyle = TableStyle([('TEXTCOLOR',(0,0),(-1,-1),colors.black),
                       ('VALIGN',(0,0),(-1,-1),'TOP'),
                       ('LINEBELOW',(0,0),(-1,-1),1,colors.black),
                       ('BOX',(0,0),(-1,-1),1,colors.black),
                       ('BOX',(0,0),(0,-1),1,colors.black)])
tblStyle.add('BACKGROUND',(0,0),(1,0),colors.lightblue)
tblStyle.add('BACKGROUND',(0,1),(-1,-1),colors.white)
tableThatSplitsOverPages.setStyle(tblStyle)
elements.append(tableThatSplitsOverPages)

doc.build(elements)

推荐答案

如果您知道页面上的确切行数，您可以使用此函数来模拟两列.这样表格仍然会自动流过多个页面，您不必担心 PageTemplates.

If you know the exact number of rows on the page you can use this function to simulate two columns. That way the the table still automatically flows over multiple pages and you don't have to worry about PageTemplates.

def columnize(data, interval):
    ret = []
    for i in range(0, len(data), interval * 2):
        for j in range(min(interval, len(data) - i)):
            ret.append(data[i + j] + (data[i + j + interval] if i + j + interval < len(data) else []))
    return ret

在您的示例中使用:

data = columnize(data, 75)
tableThatSplitsOverPages = Table(data, [2.5 * cm, 2.5 * cm], repeatRows=1)

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