Re: Multiple layout section override ?

Thanks for the ideas.

I have tried the macro solution from your reply, seems great !

the layout file :
<#macro defaultHeader>
defaultHeader here
</#macro>

<#macro defaultFooter>
defaultFooter here
</#macro>

<#macro layout header=defaultHeader footer=defaultFooter>
<@header />
<#nested>
<@footer />
</#macro>

the 'page' file that overrides a header n provide a body as usual:
<#macro overrideHeader>
header overriden
</#macro>

<@layout header=overrideHeader>
body overriden
</@layout>

The output is :
header overriden
body overriden
defaultFooter here

------------------

I have not tried the java directive yet. I would like to clarify some
points before trying it out :

> The layout macro need to push a TemplateHashModel into a stack that's
stored in a custom Environment attribute,
How to do this inside the macro, is it by using #assign directive to store
to the global variable so it can be fetched later from the
TemplateDirectiveModel's Environment via the getGlobalVariable() ?
If yes, how do i assign a 'hash' to a global variable ? And i dont see any
stack in the Environment api doc.

> then call #nested.
This is as simple as providing <#nested> in the macro, correct ?

> Then, @block should capture the content generated inside its body, get
the topmost TemplateHashModel from said
stack, and put the captured content into with block name (like"heading") as
the key.
So, this means that the <#nested> in the layout doesnt produce any output
at all.
And to produce the header, body, footer, i have to loop all the captured
contents stored in the global variable, correct ?
And if this is so, what is the convenient way to provide a default content
for a section that might not be overriden ?

Thank you so much !


On Sat, Mar 9, 2013 at 7:53 AM, Daniel Dekany <[email protected]> wrote:

> Wednesday, March 6, 2013, 2:46:26 PM, Albert Kam wrote:
>
> > I am aware that i can use macros for layouting, for example, a main
> > layout that contains header, left body section, center body section,
> footer.
> >
> > Based on the examples i have googled, like this one here
> >
> http://wendefer.blogspot.com/2007/09/handy-tip-for-layouts-in-freemarker.html
> ,
> > i can use <#nested> in the main layout for dynamic values for other
> > templates that use this main layout macro.
> >
> > But in my case, i would like the other templates to be able to
> > 'override' more than 1 <#nested>, for example, providing the content
> > of left body section -and- center body section (like apache tiles).
> >
> > Is this supported, or maybe is there any other approaches to do this ?
>
> Sadly, there's still no built-in solution for this. I have seen two
> approaches to work this around. First is passing macros to the layout
> macro:
>
>   <#macro myHeading>
>     ...
>   </#macro>
>
>   <#macro myFooter>
>     ...
>   </#macro>
>
>   <@myApp.page heading=myHeading body=myFooter>
>     ... this is the body ...
>   </@myApp.page>
>
> It's kind of noisy though. So I would rather implement this (some
> deeper FreeMarker knowledge is needed):
>
>   <@myApp.page>
>     <@block name="heading">
>       ...
>     </@block>
>     <@block name="body">
>       ...
>     </@block>
>     <@block name="footer">
>       ...
>     </@block>
>   </@myApp.page>
>
> Here @block has to be implemented by you, in Java
> (TemplateDirectiveModel). The layout macro need to push a
> TemplateHashModel into a stack that's stored in a custom Environment
> attribute, then call #nested. Then, @block should capture the content
> generated inside its body, get the topmost TemplateHashModel from said
> stack, and put the captured content into with block name (like
> "heading") as the key.
>
> --
> Best regards,
>  Daniel Dekany
>
>
>
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The past no longer is. The future has not yet come.
Looking deeply at life as it is in the very here and now,
the practitioner dwells in stability and freedom.
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------------------------------------------------------------------------------
Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester  
Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the  
endpoint security space. For insight on selecting the right partner to 
tackle endpoint security challenges, access the full report. 
http://p.sf.net/sfu/symantec-dev2dev

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