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From "Barry Books (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAP5-2099) Update parameters bound to literal: or symbol: from a mixin
Date Tue, 23 Feb 2016 14:17:18 GMT

    [ https://issues.apache.org/jira/browse/TAP5-2099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15158923#comment-15158923
] 

Barry Books commented on TAP5-2099:
-----------------------------------

I'm not sure I understand the scenario you are describing. The example I pasted above

@Parameter(BindingConstants.SYMBOL + ":" + ComponentParameterConstants.GRID_ROWS_PER_PAGE)
private int rowsPerPage;

is from the grid. If I create a mixin

@BindParamter
int rowsPerPage;

void BeginRender() {
rowsperpage = 10;
}

The grid will now use 10 as the rows per page. If you mean something else fork the project
and try it. Keep in mind the sample project I posted only works for literals. The code in
this thread works for symbols which is what the grid uses. I've been running something like
the above code for almost 3 years now and I have not had any problems I think were caused
by it.

> Update parameters bound to literal: or symbol: from a mixin
> -----------------------------------------------------------
>
>                 Key: TAP5-2099
>                 URL: https://issues.apache.org/jira/browse/TAP5-2099
>             Project: Tapestry 5
>          Issue Type: Improvement
>    Affects Versions: 5.3.6, 5.4
>            Reporter: Lance
>              Labels: patch
>         Attachments: TAP52099-1.patch
>
>
> Currently, I cannot update a component component parameter that is initialized with a
literal: or symbol: binding from a mixin. If I try to @BindParameter the param and change
it's value, I get a "Binding %s is read-only" exception (originating from AbstractBinding).
> I propose that literal and symbol bindings are sourced from a PerThreadValue that can
be updated by a mixin.
> My original need for this was to create a "SinglePage" mixin for the Grid component which
would set the rowsPerPage parameter to Integer.MAX_VALUE. I can't currently do this because
by default, the parameter is a symbol: binding.



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