python - 如何在 ReportLab platypus 中使用 BaseDocTemplate 呈现多个页面？

Question

我是 ReportLab 的新手，正在尝试使用 Platypus 生成 PDF，其中每个部分都有不同的页面模板(以及不同的页眉和页脚)。如何在不使用 SimpleDocTemplate 的情况下使用 BaseDocTemplate 执行此操作？

我正在尝试下面的代码，但我无法显示框架的内容，除了我直接在 Canvas 上绘制的第一页。为了简洁起见，我删除了每个 PageTemplate 的额外格式以及页眉和页脚代码。

from reportlab.platypus import (BaseDocTemplate, Paragraph, Spacer,
                            PageBreak, Frame, PageTemplate, NextPageTemplate)
from reportlab.pdfgen import canvas
from reportlab.lib import pagesizes, units, styles, enums

class Report(object):
    def __init__(self, stream, sections):
        self.stream = stream
        self.sections = sections
        w, h = pagesizes.A4
        self._width = w
        self._height = h
        self._story = []
        self._doc = None
        self._canvas = canvas.Canvas(self.stream)
        self._stylesheet = styles.getSampleStyleSheet()

    def generate(self):
        '''Generate the report'''
        self._doc = BaseDocTemplate(self.stream,
                                    pagesize=(self._width, self._height),
                                    showBoundary=True
                                    )
        # Start with the coverpage, then create a new page for each section.
        self.coverpage()
        for i, p in enumerate(self.sections):
            self.render_section(i, p)
        self._doc.build(self._story)
        self._canvas.save()

    def coverpage(self):
        '''Draw the cover page'''
        frame = Frame(0, 0, self._width, self._height)
        self._doc.addPageTemplates(PageTemplate(id='cover', frames=[frame]))
        self._story.append(PageBreak())
        # The cover page just has some drawing on the canvas.
        self._canvas.saveState()
        self._canvas.setFont('Helvetica', 16)
        self._canvas.drawCentredString(self._width / 2.0, self._height - 108,
                                       "This is the first page")
        self._canvas.restoreState()

    def render_section(self, num, text):
        '''Put stuff on the canvas that belong to this section.'''
        frame = Frame(0, 0, self._width, self._height, showBoundary=1)
        self._doc.addPageTemplates(PageTemplate(id='section-%d' % num,
                                                frames=[frame]))
        h1 = self._stylesheet['Heading1']
        h1.alignment = enums.TA_CENTER
        frames = [NextPageTemplate('section-%d' % num),
                  Paragraph(self.sections[num], h1),
                  Spacer(1, units.inch * 0.2),
                  PageBreak()]
        self._story.extend(frames)


if __name__ == '__main__':
    Report('report.pdf', "Why is this not showing?".split(" ")).generate()

Answer 1

你的答案是here .给定链接上的示例代码非常清楚地说明了如何使用 BaseDocTemplate 显示多个框架。