Reportlab标题超出了可流动的表

Question

我正在尝试创建一个标题，该标题将出现在我使用Reportlab生成的PDF文档的每个页面上。 我想要实现的是拥有一个由表组成的标题。

我有一个方法可以像这样创建标题：

    def make_header(self, canvas, doc):
    small_size = '8'
    big_size= '10'
    paragraphs = {}
    canvas.saveState()
    for key, name in (('doc_type', 'Document type'), ('owner', 'Owner'),
                      ('classification', 'Classification'),
                      ('document_nr', 'Document Number'),
                      ('date', 'Date'),
                      ('revision', 'Revision'),
                      ('title', 'Title')):
        t = self.header_info[key] if self.header_info[key] else ''
        paragraphs[key] = [Paragraph('<font size={}>{}</font>'.format(small_size, name), style=styles['Normal']),
                         Paragraph('<font size={}>{}</font>'.format(big_size, t), style=styles['Normal'])]

    im = self.scale_image("image.jpg", 10*cm)

    page = [Paragraph('<font size={}>{}</font>'.format(small_size, 'Page'), style=styles['Normal']),
            Paragraph('<font size={}>{}</font>'.format(big_size, doc.page), style=styles['Normal'])]

    t = Table([[im, paragraphs['doc_type'], paragraphs['owner'], paragraphs['date']],
               ['', paragraphs['classification'], paragraphs['document_nr'], paragraphs['revision']],
               ['', paragraphs['title'],'', page]])

    t.setStyle([('SPAN', (0,0), (0,2)),
                ('SPAN', (1,2), (2,2)),
                ('ALIGN', (0,0), (0,0), 'CENTER'),
                ('VALIGN', (0,0), (0,0), 'MIDDLE'),
                ('VALIGN', (1,0), (-1,-1), 'TOP')])
    self.table_grid(t)
    t.wrapOn(canvas, self.width-50, self.height)
    t.drawOn(canvas, *self.coord(10,10, mm))
    canvas.restoreState()

然后执行以下操作：

def build(self):
    t = Paragraph('test', style=styles['Normal'])
    self.doc.build([t], onFirstPage=self.make_header)

我文档中唯一显示的是“test”字符串，但不是标题。 我已经通过在make_header函数中使用print进行了测试，因此我知道它被调用并运行。

我找不到什么遗失，所以请帮助我朝正确的方向发展。

Answer 1

您好，您的问题与缺少的元素有点混淆。我认为问题在于你如何使用wrapOn和drawOn。这是我的黑客版本，至少做了一些事情;有关reportlab的更多帮助和讨论，您可以在用户列表https://pairlist2.pair.net/mailman/listinfo/reportlab-users

中询问

from reportlab.platypus import Spacer, SimpleDocTemplate, Table, TableStyle
from reportlab.platypus.paragraph import Paragraph
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib import colors
from reportlab.lib.units import inch

styles = getSampleStyleSheet()
class Test:
    header_info = dict(
            doc_type='MMMMM',
            )
    def make_header(self, canvas, doc):
        small_size = '8'
        big_size= '10'
        paragraphs = {}
        canvas.saveState()
        pageWidth, pageHeight = canvas._pagesize

        for key, name in (('doc_type', 'Document type'), ('owner', 'Owner'),
                          ('classification', 'Classification'),
                          ('document_nr', 'Document Number'),
                          ('date', 'Date'),
                          ('revision', 'Revision'),
                          ('title', 'Title')):
            t = self.header_info.get(key,'')
            paragraphs[key] = [Paragraph('<font size={}>{}</font>'.format(small_size, name), style=styles['Normal']),
                             Paragraph('<font size={}>{}</font>'.format(big_size, t), style=styles['Normal'])]

        #im = self.scale_image("image.jpg", 10*cm)

        page = [Paragraph('<font size={}>{}</font>'.format(small_size, 'Page'), style=styles['Normal']),
                Paragraph('<font size={}>{}</font>'.format(big_size, doc.page), style=styles['Normal'])]

        t = Table([['im', paragraphs['doc_type'], paragraphs['owner'], paragraphs['date']],
                   ['', paragraphs['classification'], paragraphs['document_nr'], paragraphs['revision']],
                   ['', paragraphs['title'],'', page]],
                    style=[('SPAN', (0,0), (0,2)),
                    ('SPAN', (1,2), (2,2)),
                    ('ALIGN', (0,0), (0,0), 'CENTER'),
                    ('VALIGN', (0,0), (0,0), 'MIDDLE'),
                    ('VALIGN', (1,0), (-1,-1), 'TOP'),
                    ('INNERGRID', (0,0), (-1,-1), 0.25, colors.black),
                    ('BOX', (0,0), (-1,-1), 2, colors.black),
                    ])

        #self.table_grid(t)
        w,h = t.wrapOn(canvas, pageWidth-20, pageHeight-20)
        t.drawOn(canvas, 10, pageHeight-h-10)
        canvas.restoreState()


    def __init__(self):
        self.doc = SimpleDocTemplate('stackoverflow-48184260.pdf')

    def build(self):
        t = Paragraph('test', style=styles['Normal'])
        self.doc.build([t], onFirstPage=self.make_header)

if __name__=='__main__':
    test = Test()
    test.build()