Re: [T5] PageLink cannot be disabled?

[Nick Westgate]

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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