我使用reportlab从动态数据自动生成pdf报告。由于内容有时太大而无法以纵向显示,因此我试图切换到横向显示大型内容。Reportlab:如何在纵向和横向之间切换?
这里是我的报告生成是如何工作的:
主要功能:
doc = DocTemplate(...) //Doctemplate is a customed BaseDocTemplate class
array = []
some_data= "Here is some data displayed in portrait"
array.append(Paragraph(some_data))
large_data = "this data is too large to be displayed in portrait"
array.append(Paragraph(large_data))
... // Some more data is added after this
doc.build(array, canvasmaker=NumberedCanvas)
我所寻找的是一种方法,能够从纵向每一步切换到横向,因为我不不知道显示它所需的页面数量。我对reportlab还是一个新东西,甚至有点用python,所以我没有看到我怎样才能正确使用reportlab(PageTemplates,flowables)提供的解决方案,因为我在最后构建了整个文档。
这里是我的其他有用的类这种情况:
class DocTemplate(BaseDocTemplate,):
def __init__(self, filename, **kw):
apply(BaseDocTemplate.__init__, (self, filename), kw)
f = Frame(2.6*cm, 2.8*cm, 16*cm, 22.7*cm, id='f')
pt = PageTemplate('RectPage', [f], onPage=beforeDrawPage, onPageEnd=afterDrawPage)
//beforeDrawPage and afterDrawPage fill the headers of the page (that also need to be in landscape)
self.addPageTemplates(pt)
我想我会添加其他页面模板或框架,但我不明白我怎么可以从一个数据中切换到另追加阶段。
class NumberedCanvas(canvas.Canvas):
def __init__(self, *args, **kwargs):
canvas.Canvas.__init__(self, *args, **kwargs)
self._saved_page_states = []
def showPage(self):
self._saved_page_states.append(dict(self.__dict__))
self._startPage()
def save(self):
"""add page info to each page (page x of y)"""
num_pages = len(self._saved_page_states)
for state in self._saved_page_states:
self.__dict__.update(state)
self.draw_page_number(num_pages)
canvas.Canvas.showPage(self)
self.setTitle("Title")
canvas.Canvas.save(self)
self._doc.SaveToFile(self._filename, self)
def draw_page_number(self, page_count):
self.setFont("Helvetica", 11)
self.drawRightString(18.5*cm, 26.8*cm,
"PAGE %d/%d" % (self._pageNumber, page_count))
我希望我没有忘记什么要清楚。
非常感谢提前。
'array'就是'story' – TNT 2014-08-29 15:55:53