RE: [T5] PageLink cannot be disabled?

[Kolesnikov, Alexander GNI]

Thanks a lot guys!

-----Original Message-----
From: Nick Westgate [mailto:[EMAIL PROTECTED] 
Sent: 05 September 2007 10:37
To: Tapestry users
Subject: Re: [T5] PageLink cannot be disabled?


Put this in your components directory and it will override Tapestry's
PageLink component unless your classes import the corelib type.

(I'll submit a JIRA.)

Cheers,
Nick.


// Copyright 2007 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License"); //
you may not use this file except in compliance with the License. // You
may obtain a copy of the License at // //
http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, //
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package yourapp.components;

import java.util.List;

import org.apache.tapestry.ClientElement;
import org.apache.tapestry.ComponentResources;
import org.apache.tapestry.Link;
import org.apache.tapestry.MarkupWriter;
import org.apache.tapestry.PageRenderSupport;
import org.apache.tapestry.annotations.Environmental;
import org.apache.tapestry.annotations.Inject;
import org.apache.tapestry.annotations.Parameter;
import org.apache.tapestry.annotations.SupportsInformalParameters;

/**
  * Generates a render request link to some other page in the
application. If an activation
  * context is supplied (as the context parameter), then the context
values will be encoded into
  * the URL. If no context is supplied, then the target page itself will
supply the context via a
  * passivate event.
  * <p>
  * Pages are not required to have an activation context. When a page
does have an activation
  * context, the value typically represents the identity of some object
displayed or otherwise
  * manipulated by the page.
  */
@SupportsInformalParameters
public class PageLink implements ClientElement
{
     /** The logical name of the page to link to. */
     @Parameter(required = true, defaultPrefix = "literal")
     private String _page;

     @Inject
     private ComponentResources _resources;

     @Environmental
     private PageRenderSupport _support;

     /**
      * If true, then then no link element is rendered (and no informal
parameters as well). The
      * body is, however, still rendered.
      */
     @Parameter("false")
     private boolean _disabled;

     private String _clientId;

     /**
      * If provided, this is the activation context for the target page
(the information will be
      * encoded into the URL). If not provided, then the target page
will provide its own
      * activation context.
      */
     @Parameter
     private List _context;

     private final Object[] _emptyContext = new Object[0];

     void beginRender(MarkupWriter writer)
     {
         if (_disabled) return;

         _clientId = _support.allocateClientId(_resources.getId());

         Object[] activationContext = _context != null ?
_context.toArray() : _emptyContext;

         Link link = _resources.createPageLink(_page,
_resources.isBound("context"),
             activationContext);

         writer.element("a", "href", link, "id", _clientId);

         _resources.renderInformalParameters(writer);
     }

     void afterRender(MarkupWriter writer)
     {
         if (_disabled) return;

         writer.end(); // <a>
     }

     public String getClientId()
     {
         return _clientId;
     }
}


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