[reportlab-users] Trying to implement "See page X"

[Robin Becker]

Roberto Alsina wrote:

> And it's almost there, but I am doing something wrong :-)

> 

> Here's my approach: In some cases, instead of a regular paragraph, create a 

> DelayedParagraph wrapper around Paragraph, which is an IndexingFlowable and 

> gets notified of bookmarks.

> 

> Then, in DelayedParagraph.notify, "fix" the text by replacing references to 

> bookmarks with the corresponding page numbers.

> 

> Example: 

> 

> 	'Go see A title (Page %(a-title)s)'%{'a-title': 2}

> 

> And it works like a charm... unless the bookmark is *after* the 

> DelayedParagraph, in which case it just gets drawn before the text is "fixed".

> 

> I though that by returning False to isSatisfied(), the delayedParagraph would 

> not get drawn, then force another build pass, fix the references, then draw 

> it, but I am obviously mistaking.

> 

> I can't use onDraw like the table of contents does because I need to put the 

> page number in the paragraph textflow, and that means I can't just "save the 

> space" for it.

> 

> Sadly since this is in rst2pdf extracting a small example is not trivial, I 

> hope my description is useful...

> 

> Here is my DelayedParagraph class: 

> 

> http://pastebin.com/f60b5f7e9

> 

In general there's no obvious way to do both forward and backward links single pass

However, it should be possible to do this with multi-pass without any delay at 
all. What's required is that the variables that are being referenced in the draw 
method have stabilized. Are you using multibuild?


-- 
Robin Becker