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<!-- **************************************************************************
#
# Copyright  (c) 2004-2010 Oracle Corporation.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Eclipse Public License v1.0
# which accompanies this distribution, and is available at
# http://www.eclipse.org/legal/epl-v10.html
#
# Contributors: 
#
#    Kohsuke Kawaguchi, Alan Harder
#        
#
#************************************************************************** --> 


<?jelly escape-by-default='true'?>
<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
  <st:documentation> <![CDATA[]
    Repeatable blocks used to present UI where the user can configure multiple entries
    of the same kind (see the Java installations configuration in the system config.)

    This tag works like <j:forEach> and repeatedly evaluate the body so that
    initially all the items get their own copy. This tag also evaluate the body
    once more with var=null to create a 'master copy', which is the template entry
    used when a new copy is inserted.

    h1. HTML structure
      this tag mainly produces the nested DIVs with CSS classes as follows:

      {noformat}
      <div class="repeated-container">   // container for the whole thing
        <div class="repeated-chunk">
          ... copy 1 ...
        <div class="repeated-chunk">
          ... copy 2 ...
        ...
      {noformat}

      The 'repeated-chunk' DIVs will also have additional CSS classes that represent
      their positions among siblings:

        first : first chunk among the siblings
        last  : last chunk among the siblings
        middle: neither first nor last
        only  : it is the only chunk (automatically get first and last at the same time)

    h1. Usage Note
      The caller of this tag should define a button to add a new copy and delete
      the current copy. Such buttons should have 'repeatable-add' CSS class and
      'repeatable-delete' CSS class respectively (it can have other CSS classes),
      so that their event handlers get properly wired up.

      The positional CSS classes on 'repeated-chunk' DIVs (as explained above)
      can be used to control the visibility of such buttons. For example, this allows
      you to hide 'delete' button if there's only one item, or only show 'add' button
      on the last row. There are a few CSS classes already defined in style.css
      for this purpose.
  ]]>
    <st:attribute name="var">
      variable that receives the item of the current iteration.
      Accessible from the body. Required unless @field is given.
    </st:attribute>
    <st:attribute name="varStatus">
      Status variable that indicates the loop status.
    </st:attribute>
    <st:attribute name="name">
      name used in the structured form submission. Defaults to the same name as @var.
    </st:attribute>
    <st:attribute name="field">
      Used for the data binding.
    </st:attribute>
    <st:attribute name="items">
      The item collection to loop over. Required unless @field is given. 
    </st:attribute>
    <st:attribute name="noAddButton">
      true if the default 'add' button (that adds a new copy) shouldn't be displayed.
      When you use this attribute,
    </st:attribute>
    <st:attribute name="add">
      If specified, this text will replace the standard "Add" text.
    </st:attribute>
    <st:attribute name="minimum">
      At least provide this number of copies initially.
      minimum="1" is useful to make sure there's always at least one entry for the user to fill in.
    </st:attribute>
    <st:attribute name="header">
      For each item, add this header.
      This also activates drag&amp;drop (where the header is a grip).
    </st:attribute>
    <st:attributeConstraints expr="((var,items,name?)|field),varStatus?,noAddButton?,add?,minimum?,header?"/>
  </st:documentation>


  <!--
    If bi-directional binding, fill in the rest of attributes automatically
  -->
  <j:choose>
    <j:when test="${attrs.field!=null}">
      <j:set var="name" value="${field}"/>
      <j:set var="var" value="instance"/>
      <j:set var="items" value="${instance[name]}"/>

      <!-- and expose update descriptor to the body of this tag -->
      <j:set var="descriptor" value="${descriptor.getPropertyType(instance,field).itemTypeDescriptor}" />
    </j:when>
    <j:otherwise>
      <j:set var="name" value="${attrs.name?:attrs.var}"/>
      <j:set var="items" value="${attrs.items}"/>
    </j:otherwise>
  </j:choose>

  <div class="repeated-container${!empty(header)?' with-drag-drop':''}">
    <!-- The first DIV is the master copy. -->
    <div class="repeated-chunk to-be-removed" name="${name}">
      <j:if test="${!empty(header)}"><div class="dd-handle">${header}</div></j:if>
      <j:scope>
        <j:set var="${var}" value="${null}"/>
        <d:invokeBody />
      </j:scope>
    </div>
    <!-- then populate them for each item -->
    <j:forEach var="loop" varStatus="loopStatus" items="${items}">
      <div class="repeated-chunk" name="${name}">
        <j:set var="${var}" value="${loop}" />
        <j:if test="${!empty(header)}"><div class="dd-handle">${header}</div></j:if>
        <d:invokeBody />
      </div>
    </j:forEach>
    <j:remove var="${var}" />

    <j:if test="${minimum &gt; 0}">
      <j:forEach begin="${h.size2(items)}" end="${minimum-1}" var="i">
        <j:set var="${var}" value="${null}" />
        <div class="repeated-chunk" name="${name}">
          <j:if test="${!empty(header)}"><div class="dd-handle">${header}</div></j:if>
          <d:invokeBody />
        </div>
      </j:forEach>
    </j:if>

    <div class="repeatable-insertion-point" />
    <j:if test="${!attrs.noAddButton}">
      <input type="button" value="${attrs.add?:'%Add'}" class="repeatable-add" />
    </j:if>
  </div>
</j:jelly>

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