如何知道框架的结尾以创建一个新的reportlab [英] how to know the end of a frame to create a new one reportlab

问题描述

我使用reportlab构建了一个pdf文件，以便更好地控制页面(颜色，填充，返回行...).我创建了一个框架.

I built a pdf using reportlab, to have more controle one the page (colors- padding- return to line...) I created a frame.

问题在于，我的文本来自数据库，需要多个页面.

the issue is that, my text is coming from a database and it need more than one page.

我想知道如何辨别页面/框架的结尾，我应该为其余文本创建一个新的结尾.

I want to know how to tell that its the end of the page/frame and I should create a new one for the rest of text.

import MySQLdb
import pprint
import sys
import csv
from datetime import *
from reportlab.pdfgen import canvas
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.lib.pagesizes import landscape, letter, A4
from reportlab.lib.units import cm, inch
from reportlab.platypus import Image, Paragraph, Frame, KeepInFrame

styles = getSampleStyleSheet()
styleN = styles['Normal']
styleH = styles['Heading1']
story = []


pdf_file_name = 'report_.pdf'
c = canvas.Canvas(pdf_file_name)
f = Frame(0.5*inch, inch, 7*inch, 10.5*inch, showBoundary=1)

story.append(Paragraph("<font size='12' face='times' color='blue'>>SOME TEXT!</font>",styleN))
story.append(Paragraph("<font size='10' face='times'>SOME TEXT</font>", styleN) )
story.append( Paragraph('MORE TEXT HERE', styleN ) )

f.addFromList(story,c)
del story [:]
c.save()

推荐答案

根据reportlab API，您不应直接使用Frame，而应使用诸如Paragraph之类的Flowable和它将为您创建和操作框架.例如，您应该使用代替f.addFromList(story,c)

According to the reportlab API, you should not be using a Frame directly, rather you should be using a Flowable such as Paragraph instead and that will create and manipulate the Frames for you. For example, instead of f.addFromList(story,c) you ought to use

for p in story:
    while f.add(p, c) == 0:
        f.split(p, c)
        f = Frame(0.5*inch, inch, 7*inch, 10.5*inch, showBoundary=1)

这样，f.add成功返回1，当它不能容纳p时返回0，这种情况发生时，我们使用f.split尽可能多地从p提取到填充 f，而不是用新的框架替换f.

This way, f.add will return 1 on success and 0 when it can't fit p into it, when that happens we use f.split to extract as much as possible from p to fill up f than replace f with a new Frame.

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