package gboat2.base.view.components;
   
   import gboat2.base.bridge.util.json.JsonUtil;
   import gboat2.base.view.GboatViewException;
   
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   
   import org.apache.commons.lang3.StringUtils;
  import org.apache.struts2.components.UIBean;
  import org.apache.struts2.views.annotations.StrutsTag;
  import org.apache.struts2.views.annotations.StrutsTagAttribute;
  
  import com.fasterxml.jackson.databind.node.ObjectNode;
  import com.opensymphony.xwork2.util.ValueStack;
  
  /**
   * <p>
   * 创建拖动元素的目标，使所选元素可拖放（这意味着 {@link Draggable} 拖动可以被拖放接受）。详见
   * <a href="http://www.jqueryui.com/droppable/" target="_blank">jQuery UI Droppable plugin</a>。
   * </p>
   * 
   * @author <a href="mailto:[email protected]">何明旺</a>
   * @since 3.0
   * @date 2014年5月4日
   */
  @StrutsTag(
          name="droppable",
          tldTagClass="gboat2.base.view.jsp.DroppableTag",
          description="创建拖动元素的目标，详见 http://www.jqueryui.com/droppable/")
  public class Droppable extends UIBean{
      
      public static final String TEMPLATE = "droppable.ftl";
  
      protected String accept;
      protected String activeClass;
      protected String addClasses;
      protected String disabled; //xxx
      protected String greedy;
      protected String hoverClass;
      protected String scope;
      protected String tolerance;
  
      protected String onActivateTopics;
      protected String onDeactivateTopics;
      protected String onDropTopics;
      protected String onOutTopics;
      protected String onOverTopics;
  
      public Droppable(ValueStack stack, HttpServletRequest req, HttpServletResponse res) {
          super(stack,req, res);
      }
  
      @Override
      protected String getDefaultTemplate() {
          return TEMPLATE;
      }
      
      @Override
      public void evaluateExtraParams() {
          UIBean component = (UIBean) findAncestor(UIBean.class);
          component.addParameter("droppable", Boolean.TRUE);
          
          Object componentId = component.getParameters().get("id");
          if(componentId == null || StringUtils.isBlank(componentId.toString()))
              throw new GboatViewException("必须为可以通过拖拽调整尺寸的元素设置 id 属性");
          addParameter("componentId", componentId);
          
          ObjectNode options = JsonUtil.generateMapper().createObjectNode();
          if (accept != null)
              options.put("accept", findString(accept));
          
          if (activeClass != null)
              options.put("activeClass", findString(activeClass));
          
          if (addClasses != null)
              options.put("addClasses", (Boolean) findValue(addClasses, Boolean.class));
          
          if (disabled != null)
              options.put("disabled", (Boolean) findValue(disabled, Boolean.class));
          
          if (greedy != null)
              options.put("greedy", (Boolean) findValue(greedy, Boolean.class));
  
          if (hoverClass != null)
              options.put("hoverClass", findString(hoverClass));
  
          if (scope != null)
              options.put("scope", findString(scope));
          
          if (tolerance != null)
              options.put("tolerance", findString(tolerance));
          
          addParameter("options", options);
  
          if (onActivateTopics != null)
              addParameter("onActivateTopics", findString(onActivateTopics));
          
          if (onDeactivateTopics != null)
             addParameter("onDeactivateTopics", findString(onDeactivateTopics));
         
         if (onOverTopics != null)
             addParameter("onOverTopics", findString(onOverTopics));
         
         if (onOutTopics != null)
             addParameter("onOutTopics", findString(onOutTopics));
         
         if (onDropTopics != null)
             addParameter("onDropTopics", findString(onDropTopics));
     }
 
     @StrutsTagAttribute(description = "符合该选择器的拖拽元素可以被接受,如： #myid 或 .myclass，详见 http://api.jqueryui.com/droppable/#option-accept", defaultValue="*")
     public void setAccept(String accept) {
         this.accept = accept;
     }
 
     @StrutsTagAttribute(description = "如果指定了该参数，在被允许的 Draggable 对象填充时，droppable 会被添加上指定的样式，详见 http://api.jqueryui.com/droppable/#option-activeClass")
     public void setActiveClass(String activeClass) {
         this.activeClass = activeClass;
     }
 
     @StrutsTagAttribute(description = "如果设置为false, 可以防止 ui-droppable 类在进行时添加. 这可能会使在初始化数百个元素执行.droppable()时使性能得到理想的优化。详见 http://api.jqueryui.com/droppable/#option-addClasses", type="Boolean", defaultValue = "true")
     public void setAddClasses(String addClasses) {
         this.addClasses = addClasses;
     }
 
     @StrutsTagAttribute(description = "如果设置为 true将禁止拖放，详见 http://api.jqueryui.com/droppable/#option-disabled", type="Boolean", defaultValue = "false")
     public void setDisabled(String disabled) {
         this.disabled = disabled;
     }
 
     @StrutsTagAttribute(description = "默认情况下，当一个元素被放到嵌套的放置（droppable）对象时，每个放置（droppable）对象都将接收到这个元素。 然而，当设置这个选项为 true 时，任何父级的放置（droppable）对象不会接收元素。详见 http://api.jqueryui.com/droppable/#option-greedy", type="Boolean", defaultValue = "false")
     public void setGreedy(String greedy) {
         this.greedy = greedy;
     }
 
     @StrutsTagAttribute(description = "如果设置了该参数,将在一个被允许的拖动元素悬停在放置（droppable）对象上时，向放置（droppable）对象添加一个指定的样式，详见 http://api.jqueryui.com/droppable/#option-hoverClass")
     public void setHoverClass(String hoverClass) {
         this.hoverClass = hoverClass;
     }
 
     @StrutsTagAttribute(description = "用来设置拖动（draggle）元素和放置（droppable）对象的集合, 除了droppable中的accept属性指定的元素外, 和放置（droppable）对象相同集合的放置（droppable）对象也被允许添加到放置（droppable）对象中，详见 http://api.jqueryui.com/droppable/#option-scope", defaultValue="default")
     public void setScope(String scope) {
         this.scope = scope;
     }
 
     @StrutsTagAttribute(description = "指定使用那种模式来测试一个拖动(draggable)元素 over 一个放置（droppable）对象。可选值：fit、intersect、pointer、 touch，详见 http://api.jqueryui.com/droppable/#option-tolerance", defaultValue="intersect")
     public void setTolerance(String tolerance) {
         this.tolerance = tolerance;
     }
 
     @StrutsTagAttribute(description = "这个事件会在任何允许的draggable对象开始拖动时触发。它可以用来在你想让droppable对象在可以被填充的时'亮起来'的时候，详见 http://api.jqueryui.com/droppable/#event-activate")
     public void setOnActivateTopics(String onActivateTopics) {
         this.onActivateTopics = onActivateTopics;
     }
 
     @StrutsTagAttribute(description = "此事件会在任何允许的draggable对象停止拖动时触发，详见 http://api.jqueryui.com/droppable/#event-deactivate")
     public void setOnDeactivateTopics(String onDeactivateTopics) {
         this.onDeactivateTopics = onDeactivateTopics;
     }
 
     @StrutsTagAttribute(description = "这个事件会在一个允许的拖动（draggable）元素填充进这个放置（droppable）对象时触发（基于tolerance选项）。详见 http://api.jqueryui.com/droppable/#event-drop")
     public void setOnDropTopics(String onDropTopics) {
         this.onDropTopics = onDropTopics;
     }
 
     @StrutsTagAttribute(description = "此事件会在一个允许的拖动（draggable）元素离开这个放置（droppable）对象时触发（基于tolerance选项）。详见 http://api.jqueryui.com/droppable/#event-out")
     public void setOnOutTopics(String onOutTopics) {
         this.onOutTopics = onOutTopics;
     }
 
     @StrutsTagAttribute(description = "此事件会在一个允许的拖动（draggable）元素经过这个放置（droppable）对象时触发（基于tolerance选项）。详见 http://api.jqueryui.com/droppable/#event-over")
     public void setOnOverTopics(String onOverTopics) {
         this.onOverTopics = onOverTopics;
     }
 }