reportlab/platypus/doctemplate.py
author rgbecker
Fri, 26 May 2000 10:27:37 +0000
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parent 227 fa5b4d81f471
child 253 cfcf8d555a2c
permissions -rw-r--r--
Fixed infinite recursion bug
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###############################################################################
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#
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#	ReportLab Public License Version 1.0
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#
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#   Except for the change of names the spirit and intention of this
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#   license is the same as that of Python
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#
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#	(C) Copyright ReportLab Inc. 1998-2000.
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#
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#
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# All Rights Reserved
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose and without fee is hereby granted, provided
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# that the above copyright notice appear in all copies and that both that
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# copyright notice and this permission notice appear in supporting
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# documentation, and that the name of ReportLab not be used
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# in advertising or publicity pertaining to distribution of the software
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# without specific, written prior permission. 
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# 
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#
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# Disclaimer
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#
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# ReportLab Inc. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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# SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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# IN NO EVENT SHALL ReportLab BE LIABLE FOR ANY SPECIAL, INDIRECT
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# OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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# PERFORMANCE OF THIS SOFTWARE. 
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#
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###############################################################################
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#	$Log: doctemplate.py,v $
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#	Revision 1.12  2000/05/26 10:27:37  rgbecker
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#	Fixed infinite recursion bug
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#
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#	Revision 1.11  2000/05/17 22:17:38  rgbecker
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#	Renamed BasicFrame to Frame
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#	
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#	Revision 1.10  2000/05/17 16:29:40  rgbecker
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#	Removal of SimpleFrame
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#	
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#	Revision 1.9  2000/05/17 15:37:33  rgbecker
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#	Changes related to removal of SimpleFlowDocument
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#	
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#	Revision 1.8  2000/05/16 16:15:16  rgbecker
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#	Changes related to removal of SimpleFlowDocument
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#	
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#	Revision 1.7  2000/05/16 14:28:55  rgbecker
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#	Fixes/Changes to get testplatypus to work with new framework
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#	
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#	Revision 1.6  2000/05/15 15:07:32  rgbecker
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#	Added drawPage
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#	
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#	Revision 1.5  2000/05/13 08:33:53  rgbecker
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#	fix typo in import
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#	
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#	Revision 1.4  2000/05/12 16:21:02  rgbecker
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#	_donothing explicit import
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#	
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#	Revision 1.3  2000/05/12 14:53:38  rgbecker
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#	Handle splitting error in build
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#	
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#	Revision 1.2  2000/05/12 14:45:31  rgbecker
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#	Single actions only in ActionFlowables
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#	
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#	Revision 1.1  2000/05/12 12:53:33  rgbecker
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#	Initial try at a document template class
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#	
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__version__=''' $Id: doctemplate.py,v 1.12 2000/05/26 10:27:37 rgbecker Exp $ '''
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__doc__="""
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More complicated Document model
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"""
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from layout import *
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from layout import _doNothing
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from types import *
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import sys
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class ActionFlowable(Flowable):
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	'''This Flowable is never drawn, it can be used for data driven controls'''
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	def __init__(self,action=[]):
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		if type(action) not in (ListType, TupleType):
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			action = (action,)
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		self.action = action
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	def wrap(self, availWidth, availHeight):
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		raise NotImplementedError
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	def draw(self):
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		raise NotImplementedError
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	def apply(self,doc):
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		action = self.action[0]
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		args = tuple(self.action[1:])
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		try:
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			apply(getattr(doc,'handle_'+action), args)
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		except AttributeError:
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			raise NotImplementedError, "Can't handle ActionFlowable(%s)" % action
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		except:
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			t, v, None = sys.exc_info()
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			raise t, "%s\n   handle_%s args=%s"%(v,action,args)
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	def __call__(self):
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		return self
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FrameBreak = ActionFlowable('frameEnd')
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PageBegin = ActionFlowable('pageBegin')
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class NextPageTemplate(ActionFlowable):
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	def __init__(self,pt):
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		ActionFlowable.__init__(self,('nextPageTemplate',pt))
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class PageTemplate:
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	"""
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	essentially a list of Frames and an onPage routine to call at the start
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	of a page when this is selected.
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	derived classes can also implement drawPage if they want
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	"""
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	def __init__(self,id=None,frames=[],onPage=None):
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		if type(frames) not in (ListType,TupleType): frames = [frames]
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		assert filter(lambda x: not isinstance(x,Frame), frames)==[], "frames argument error"
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		self.id = id
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		self.frames = frames
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		self.onPage = onPage or _doNothing
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	def drawPage(self,canv,doc):
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		'''	Override this if you want additional functionality or prefer a class
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			based page routine
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		'''
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		pass
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class BaseDocTemplate:
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	"""
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	First attempt at defining a document template class.
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	The basic idea is simple.
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	0)	The document has a list of data associated with it
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		this data should derive from flowables. We'll have
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		special classes like PageBreak, FrameBreak to do things
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		like forcing a page end etc.
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	1)	The document has one or more page templates.
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	2)	Each page template has one or more frames.
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	3)	The document class provides base methods for handling the
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		story events and some reasonable methods for getting the
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		story flowables into the frames.
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	4)	The document instances can override the base handler routines.
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	"""
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	def __init__(self, filename, pagesize=DEFAULT_PAGE_SIZE, pageTemplates=[], showBoundary=0,
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				leftMargin=inch, rightMargin=inch, topMargin=inch, bottomMargin=inch,
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				allowSplitting=1):
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		self.pageTemplates = []
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		self.addPageTemplates(pageTemplates)
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		self.filename = filename
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		self.showBoundary = showBoundary
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		self.leftMargin =  leftMargin
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		self.bottomMargin = bottomMargin
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		self.rightMargin = pagesize[0] - rightMargin
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		self.topMargin = pagesize[1] - topMargin
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		self.width = self.rightMargin - self.leftMargin
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		self.height = self.topMargin - self.bottomMargin
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		self.pagesize = pagesize
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		self.allowSplitting = allowSplitting
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		self._pageBreakQuick = 1
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	def clean_hanging(self):
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		'handle internal postponed actions'
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		while len(self._hanging):
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			self.handle_flowable(self._hanging)
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	def addPageTemplates(self,pageTemplates):
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		'add one or a sequence of pageTamplates'
197
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		if type(pageTemplates) not in (ListType,TupleType):
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			pageTemplates = [pageTemplates]
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		assert filter(lambda x: not isinstance(x,PageTemplate), pageTemplates)==[], "pageTemplates argument error"
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		for t in pageTemplates:
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			self.pageTemplates.append(t)
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	def handle_documentBegin(self):
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		'''Hook actions at beginning of document'''
197
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		self._hanging = [PageBegin]
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		self.pageTemplate = self.pageTemplates[0]
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		self.page = 0
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	def handle_pageBegin(self):
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		'''Perform actions required at beginning of page.
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		shouldn't normally be called directly'''
197
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		self.page = self.page + 1
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		self.pageTemplate.drawPage(self.canv,self)
197
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		self.pageTemplate.onPage(self.canv,self)
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		if hasattr(self,'_nextFrameIndex'):
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			del self._nextFrameIndex
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		self.frame = self.pageTemplate.frames[0]
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		self.handle_frameBegin()
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	def handle_pageEnd(self):
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		'''	show the current page
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			check the next page template
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			hang a page begin
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		'''
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		self.canv.showPage()
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		if hasattr(self,'_nextPageTemplateIndex'):
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			self.pageTemplate = self.pageTemplates[self._nextPageTemplateIndex]
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			del self._nextPageTemplateIndex
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		self._hanging.append(PageBegin)
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	def handle_pageBreak(self):
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		'''some might choose not to end all the frames'''
218
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   213
		if self._pageBreakQuick:
197
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			self.handle_pageEnd()
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		else:
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			n = len(self._hanging)
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			while len(self._hanging)==n:
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				self.handle_frameEnd()
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	def handle_frameBegin(self,*args):
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diff changeset
   221
		'''What to do at the beginning of a page'''
197
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		self.frame._reset()
218
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diff changeset
   223
		if self.showBoundary or self.frame.showBoundary:
226
a9acb67cdef7 Removal of SimpleFrame
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			self.frame.drawBoundary(self.canv)
197
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	def handle_frameEnd(self):
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		'''	Handles the semantics of the end of a frame. This includes the selection of
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			the next frame or if this is the last frame then invoke pageEnd.
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		'''
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		if hasattr(self,'_nextFrameIndex'):
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   231
			frame = self.pageTemplate.frames[self._nextFrameIndex]
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			del self._nextFrameIndex
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diff changeset
   233
			self.handle_frameBegin()
197
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   234
		elif hasattr(self.frame,'lastFrame') or self.frame is self.pageTemplate.frames[-1]:
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			self.handle_pageEnd()
218
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diff changeset
   236
			self.frame = None
197
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		else:
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			f = self.frame
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			self.frame = self.pageTemplate.frames[self.pageTemplate.frames.index(f) + 1]
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			self.handle_frameBegin()
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	def handle_nextPageTemplate(self,pt):
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   243
		'''On endPage chenge to the page template with name or index pt'''
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   244
		if type(pt) is StringType:
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   245
			for t in self.pageTemplates:
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   246
				if t.id == pt:
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					self._nextPageTemplateIndex = self.pageTemplates.index(t)
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   248
					return
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   249
			raise ValueError, "can't find template('%s')"%pt
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   250
		elif type(pt) is IntType:
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   251
			self._nextPageTemplateIndex = pt
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   252
		else:
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			raise TypeError, "argument pt should be string or integer"
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   254
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   255
	def handle_nextFrame(self,fx):
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   256
		'''On endFrame chenge to the frame with name or index fx'''
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   257
		if type(fx) is StringType:
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   258
			for f in self.pageTemplate.frames:
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   259
				if f.id == fx:
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   260
					self._nextFrameIndex = self.pageTemplate.frames.index(f)
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   261
					return
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   262
			raise ValueError, "can't find frame('%s')"%fx
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   263
		elif type(fx) is IntType:
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   264
			self._nextFrameIndex = fx
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   265
		else:
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   266
			raise TypeError, "argument fx should be string or integer"
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   267
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   268
	def handle_currentFrame(self,fx):
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   269
		'''chenge to the frame with name or index fx'''
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   270
		if type(fx) is StringType:
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   271
			for f in self.pageTemplate.frames:
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   272
				if f.id == fx:
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   273
					self._nextFrameIndex = self.pageTemplate.frames.index(f)
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   274
					return
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   275
			raise ValueError, "can't find frame('%s')"%fx
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   276
		elif type(fx) is IntType:
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   277
			self._nextFrameIndex = fx
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   278
		else:
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   279
			raise TypeError, "argument fx should be string or integer"
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   280
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   281
	def handle_flowable(self,flowables):
218
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   282
		'''try to handle one flowable from the front of list flowables.'''
197
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   283
		f = flowables[0]
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   284
		del flowables[0]
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   285
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   286
		if isinstance(f,PageBreak):
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   287
			self.handle_pageBreak()
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   288
		elif isinstance(f,ActionFlowable):
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   289
			f.apply(self)
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   290
		else:
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   291
			#general case we have to do something
218
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diff changeset
   292
			if not self.frame.add(f, self.canv, trySplit=self.allowSplitting):
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   293
				if self.allowSplitting:
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   294
					# see if this is a splittable thing
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   295
					S = self.frame.split(f)
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   296
					n = len(S)
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   297
				else:
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   298
					n = 0
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diff changeset
   299
197
b8ca098f5ec7 Initial try at a document template class
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   300
				if n:
200
74da573e661f Handle splitting error in build
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diff changeset
   301
					if not self.frame.add(S[0], self.canv, trySplit=0):
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   302
						raise "LayoutError", "splitting error"
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diff changeset
   303
					del S[0]
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diff changeset
   304
					for f in xrange(n-1):
197
b8ca098f5ec7 Initial try at a document template class
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   305
						flowables.insert(f,S[f])	# put split flowables back on the list
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   306
				else:
249
1d9ea4f00348 Fixed infinite recursion bug
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diff changeset
   307
					if hasattr(f,'postponed'):
1d9ea4f00348 Fixed infinite recursion bug
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diff changeset
   308
						raise "LayoutError", "Flowable too large"
1d9ea4f00348 Fixed infinite recursion bug
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diff changeset
   309
					f.postponed = 1
197
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   310
					flowables.insert(0,f)			# put the flowable back
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   311
					self.handle_frameEnd()
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   312
204
b19c3cae893a _donothing explicit import
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diff changeset
   313
	#these are provided so that deriving classes can refer to them
197
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   314
	_handle_documentBegin = handle_documentBegin
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   315
	_handle_pageBegin = handle_pageBegin
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   316
	_handle_pageEnd = handle_pageEnd
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   317
	_handle_frameBegin = handle_frameBegin
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   318
	_handle_frameEnd = handle_frameEnd
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   319
	_handle_flowable = handle_flowable
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   320
	_handle_nextPageTemplate = handle_nextPageTemplate
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   321
	_handle_currentFrame = handle_currentFrame
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   322
	_handle_nextFrame = handle_nextFrame
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diff changeset
   323
218
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   324
	def _startBuild(self):
197
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   325
		self.canv = canvas.Canvas(self.filename)
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   326
		self.handle_documentBegin()
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diff changeset
   327
218
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diff changeset
   328
	def _endBuild(self):
197
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   329
		if self._hanging!=[] and self._hanging[-1] is PageBegin:
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diff changeset
   330
			del self._hanging[-1]
b8ca098f5ec7 Initial try at a document template class
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parents:
diff changeset
   331
			self.clean_hanging()
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   332
		else:
b8ca098f5ec7 Initial try at a document template class
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diff changeset
   333
			self.clean_hanging()
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parents:
diff changeset
   334
			self.handle_pageBreak()
b8ca098f5ec7 Initial try at a document template class
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diff changeset
   335
b8ca098f5ec7 Initial try at a document template class
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   336
		self.canv.save()
b8ca098f5ec7 Initial try at a document template class
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   337
		del self.frame, self.pageTemplate
218
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   338
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   339
	def build(self, flowables):
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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diff changeset
   340
		assert filter(lambda x: not isinstance(x,Flowable), flowables)==[], "flowables argument error"
274db2129c04 Fixes/Changes to get testplatypus to work with new framework
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		self._startBuild()
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   342
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		while len(flowables):
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			self.clean_hanging()
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			self.handle_flowable(flowables)
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		self._endBuild()
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   348
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class SimpleDocTemplate(BaseDocTemplate):
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	def handle_pageBegin(self):
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		self._handle_pageBegin()
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		self._handle_nextPageTemplate('Later')
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   353
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	def build(self,flowables,onFirstPage=_doNothing, onLaterPages=_doNothing):
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		frameT = Frame(self.leftMargin, self.bottomMargin, self.width, self.height, id='normal')
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		self.addPageTemplates([PageTemplate(id='First',frames=frameT, onPage=onFirstPage),
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						PageTemplate(id='Later',frames=frameT, onPage=onLaterPages)])
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		if onFirstPage is _doNothing and hasattr(self,'onFirstPage'):
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			self.pageTemplates[0].drawPage = self.onFirstPage
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		if onLaterPages is _doNothing and hasattr(self,'onLaterPages'):
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			self.pageTemplates[1].drawPage = self.onLaterPages
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		BaseDocTemplate.build(self,flowables)
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   363
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if __name__ == '__main__':
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	##########################################################
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	##
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	##	 testing
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	##
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	##########################################################
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	def randomText():
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		#this may or may not be appropriate in your company
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		from random import randint, choice
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   373
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		RANDOMWORDS = ['strategic','direction','proactive',
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		'reengineering','forecast','resources',
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		'forward-thinking','profit','growth','doubletalk',
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		'venture capital','IPO']
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   378
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		sentences = 5
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		output = ""
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		for sentenceno in range(randint(1,5)):
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			output = output + 'Blah'
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			for wordno in range(randint(10,25)):
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				if randint(0,4)==0:
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					word = choice(RANDOMWORDS)
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				else:
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					word = 'blah'
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				output = output + ' ' +word
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			output = output+'.'
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		return output
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   391
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   392
	def myFirstPage(canvas, doc):
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		canvas.saveState()
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		canvas.setStrokeColor(red)
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		canvas.setLineWidth(5)
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		canvas.line(66,72,66,PAGE_HEIGHT-72)
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   397
		canvas.setFont('Times-Bold',24)
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   398
		canvas.drawString(108, PAGE_HEIGHT-108, "PLATYPUS")
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   399
		canvas.setFont('Times-Roman',12)
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		canvas.drawString(4 * inch, 0.75 * inch, "First Page")
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		canvas.restoreState()
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   402
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   403
	def myLaterPages(canvas, doc):
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   404
		canvas.saveState()
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   405
		canvas.setStrokeColor(red)
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   406
		canvas.setLineWidth(5)
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   407
		canvas.line(66,72,66,PAGE_HEIGHT-72)
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   408
		canvas.setFont('Times-Roman',12)
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   409
		canvas.drawString(4 * inch, 0.75 * inch, "Page %d" % doc.page)
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   410
		canvas.restoreState()
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   411
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   412
	def run():
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   413
		objects_to_draw = []
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   414
		from reportlab.lib.styles import ParagraphStyle
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   415
		from paragraph import Paragraph
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   416
		from doctemplate import SimpleDocTemplate
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   417
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   418
		#need a style
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   419
		normal = ParagraphStyle('normal')
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   420
		normal.firstLineIndent = 18
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   421
		normal.spaceBefore = 6
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   422
		import random
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   423
		for i in range(15):
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   424
			height = 0.5 + (2*random.random())
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   425
			box = XBox(6 * inch, height * inch, 'Box Number %d' % i)
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   426
			objects_to_draw.append(box)
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   427
			para = Paragraph(randomText(), normal)
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   428
			objects_to_draw.append(para)
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   429
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   430
		SimpleDocTemplate('doctemplate.pdf',DEFAULT_PAGE_SIZE).build(objects_to_draw,
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   431
			onFirstPage=myFirstPage,onLaterPages=myLaterPages)
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   432
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   433
	run()