<?xml version="1.0" encoding="UTF-8"?>
<section>
  <sectioninfo>
    <keywordset>
      <keyword>rich:dropSupport</keyword>

      <keyword>HtmlDropSupport</keyword>
    </keywordset>
  </sectioninfo>

  <section>
    <table>
      <title>Component identification parameters</title>

      <tgroup cols="2">
        <thead>
          <row>
            <entry>Name</entry>

            <entry>Value</entry>
          </row>
        </thead>

        <tbody>
          <row>
            <entry>component-type</entry>

            <entry>org.richfaces.DropSupport</entry>
          </row>

          <row>
            <entry>component-class</entry>

            <entry>org.richfaces.component.html.HtmlDropSupport</entry>
          </row>

          <row>
            <entry>component-family</entry>

            <entry>org.richfaces.DropSupport</entry>
          </row>

          <row>
            <entry>renderer-type</entry>

            <entry>org.richfaces.DropSupportRenderer</entry>
          </row>

          <row>
            <entry>tag-class</entry>

            <entry>org.richfaces.taglib.DropSupportTag</entry>
          </row>
        </tbody>
      </tgroup>
    </table>
  </section>

  <section>
    <title>Creating the Component with a Page Tag</title>

    <para>This simple example shows how to make a panel component a potential drop target for
      drag-and-drop operations using "text" elements as the dragged items.</para>

    <para>
      <emphasis role="bold">Example:</emphasis>
    </para>
    <programlisting role="XML"><![CDATA[...
    <rich:panel>
        <rich:dropSupport acceptedTypes="text"/>
    </rich:panel>
...
]]></programlisting>
  </section>

  <section>
    <title>Creating the Component Dynamically Using Java</title>


    <para>
      <emphasis role="bold">Example:</emphasis>
    </para>
    <programlisting role="JAVA"><![CDATA[import org.richfaces.component.html.HtmlDropSupport;
...
HtmlDropSupport myDragZone = new HtmlDropSupport();
...
]]></programlisting>
  </section>

  <section>
    <title>Details of Usage</title>

    <para>As shown in the example, the key attribute for <emphasis role="bold">
        <property>&lt;rich:dropSupport&gt;</property>
      </emphasis> is <emphasis>
        <property>"acceptedTypes"</property>
      </emphasis>. This attribute defines the types of draggable items that can be dropped onto the
      designated drop zone.</para>

    <para>The second most important attribute for <emphasis role="bold">
        <property>&lt;rich:dropSupport&gt;</property>
      </emphasis> is <emphasis>
        <property>"typeMapping"</property>
      </emphasis>. This attribute maps a specific type among the acceptable types for draggable
      items to a specific <emphasis role="bold">
        <property>&lt;rich:dndParam&gt;</property>
      </emphasis> child element under <emphasis role="bold">
        <property>&lt;rich:dropSupport&gt;</property>
      </emphasis>.</para>


    <para>
      <emphasis role="bold">Example:</emphasis> </para>
   
    <programlisting role="XML"><![CDATA[...
    <rich:dropSupport acceptedTypes="[iconsDragged, textDragged]" typeMapping="{iconsDragged: DropIcon}"> 
        <rich:dndParam name="DropIcon">
            <h:graphicImage value="/images/drop-icon.png"/>
		</rich:dndParam>
...
]]></programlisting>

    <para>In this example, dropping a draggable item of an <emphasis><property>&quot;iconsDragged&quot;</property></emphasis> type
      will trigger the use a parameter named <emphasis><property>&quot;DropIcon&quot;</property></emphasis> in the event processing
      after a drop event. (Also, an Ajax request is sent, and the action and dropListener defined
      for the component are called.)</para>

    <para>Here is an example of moving records between tables. The example describes all the pieces
      for drag-and-drop. (To get extra information on these components, read the sections for these
      components.)</para>

    <para>As draggable items, this table contains a list of such items designated as being of type
      "text":</para>


    <para>
      <emphasis role="bold">Example:</emphasis></para>
    
    <programlisting role="XML"><![CDATA[...
    <rich:dataTable value="#{capitalsBean.capitals}" var="caps">
        <f:facet name="caption">Capitals List</f:facet>
        <h:column>
        <a4j:outputPanel>
            <rich:dragSupport dragIndicator=":form:ind" dragType="text">
                <a4j:actionParam value="#{caps.name}" name="name"/>
            </rich:dragSupport>
            <h:outputText value="#{caps.name}"/> 
        </a4j:outputPanel>
        </h:column>
    </rich:dataTable>
...
]]></programlisting>

    <para>As a drop zone, this panel will accept draggable items of type "text" and then rerender an
      element with the ID of "box":</para>


    <para>
      <emphasis role="bold">Example:</emphasis> </para>
   
    <programlisting role="XML"><![CDATA[...
    <rich:panel style="width:100px;height:100px;">
        <f:facet name="header">Drop Zone</f:facet>
        <rich:dropSupport acceptedTypes="text" reRender="box" 
                        dropListener="#{capitalsBean.addCapital2}"/>
    </rich:panel>
...
]]></programlisting>

    <para>As a part of the page that can be updated in a partial page update, this table has an ID
      of "box":</para>


    <para>
      <emphasis role="bold">Example:</emphasis>
    </para>
    <programlisting role="XML"><![CDATA[...
    <rich:dataTable value="#{capitalsBean.capitals2}" var="cap2" id="box">
        <f:facet name="caption">Capitals chosen</f:facet>
        <h:column>
            <h:outputText value="#{cap2.name}"/>
        </h:column>
    </rich:dataTable>
...]]></programlisting>

    <para>And finally, as a listener, this listener will implement the dropped element:</para>


    <para>
      <emphasis role="bold">Example:</emphasis>
    </para>
    <programlisting role="JAVA"><![CDATA[...
    public void addCapital2(DropEvent event) {
        FacesContext context = FacesContext.getCurrentInstance();
        Capital cap = new Capital();
        cap.setName(context.getExternalContext().getRequestParameterMap().get("name").toString());
        capitals2.add(cap);
    }
...
]]></programlisting>

    <para>Here is the result after a few drops of items from the first table:</para>

    <figure>
      <title>Results of drop actions</title>

      <mediaobject>
        <imageobject>
          <imagedata fileref="images/dropSupport2.png"/>
        </imageobject>
      </mediaobject>
    </figure>

    <para>In this example, items are dragged element-by-element from the rendered list in the first
      table and dropped on a panel in the middle. After each drop, a drop event is generated and a
      common Ajax request is performed that renders results in the third table.</para>

    <para>As with every Ajax action component, <emphasis role="bold">
        <property>&lt;rich:dropSupport&gt;</property>
      </emphasis> has all the common attributes (<emphasis><property>"timeout"</property>,</emphasis>
      <emphasis><property>"limitToList"</property>,</emphasis>
      <emphasis><property>"reRender"</property>,</emphasis> etc.) for Ajax request customization.</para>

    <para>Finally, the component has the following extra attributes for event processing on the
      client:</para>

    <itemizedlist>
      <listitem>ondragenter</listitem>

      <listitem>ondragexit</listitem>

      <listitem>ondrop</listitem>

      <listitem>ondropend</listitem>
    </itemizedlist>

    <para>Developers can use their own custom JavaScript functions to handle these events.</para>

  </section>

  <section>
    <title>Look-and-Feel Customization</title>

    <para><emphasis role="bold">
      <property>&lt;rich:dropSupport&gt;</property>
    </emphasis> has no skin parameters and custom <property>style classes</property>, as the
      component isn&apos;t visual.</para>
  </section>
  <section>
    <title>Relevant Resources Links</title>
    <para>
      <ulink url="http://livedemo.exadel.com/richfaces-demo/richfaces/dragSupport.jsf?c=dropSupport"
        >Here</ulink> you can see the example of <emphasis role="bold"
        ><property>&lt;rich:dropSupport&gt;</property></emphasis> usage and sources for the given example.
    </para>
  </section>

</section>
