/**
    * Copyright 2010 The Kuali Foundation Licensed under the
    * Educational Community 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.osedu.org/licenses/ECL-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 org.kuali.student.common.ui.client.widgets.impl;
  
  import org.kuali.student.common.ui.client.util.DebugIdUtils;
  import org.kuali.student.common.ui.client.widgets.KSButtonAbstract;
  
  import com.google.gwt.event.dom.client.ClickHandler;
  import com.google.gwt.event.dom.client.MouseOutHandler;
  import com.google.gwt.event.dom.client.MouseOverHandler;
  import com.google.gwt.event.shared.HandlerRegistration;
  import com.google.gwt.user.client.DOM;
  import com.google.gwt.user.client.ui.Anchor;
  import com.google.gwt.user.client.ui.ComplexPanel;
  import com.google.gwt.user.client.ui.InlineLabel;
  import com.google.gwt.user.client.ui.Widget;
  
  public class KSButtonImpl extends KSButtonAbstract {
  
      private static class SpanPanel extends ComplexPanel {
  
          public SpanPanel() {
              setElement(DOM.createSpan());
          }
  
          /**
           * Adds a new child widget to the panel.
           * 
           * @param w the widget to be added
           */
          @Override
          public void add(Widget w) {
              add(w, getElement());
          }
  
          /**
           * Inserts a widget before the specified index.
           * 
           * @param w the widget to be inserted
           * @param beforeIndex the index before which it will be inserted
           * @throws IndexOutOfBoundsException if <code>beforeIndex</code> is out of range
           */
          public void insert(Widget w, int beforeIndex) {
              insert(w, getElement(), beforeIndex, true);
          }
      }
  
      private SpanPanel panel = new SpanPanel();
      private Anchor anchor;
      private InlineLabel disabledLabel = new InlineLabel();
      private boolean enabled = true;
      private ButtonStyle currentStyle;
  
      public boolean isEnabled() {
          return enabled;
      }
  
      public void setEnabled(boolean enabled) {
          anchor.setEnabled(enabled);
          if (enabled) {
              panel.remove(disabledLabel);
              panel.add(anchor);
          } else {
              panel.remove(anchor);
              panel.add(disabledLabel);
          }
      }
  
      @Override
      public HandlerRegistration addClickHandler(ClickHandler handler) {
          return anchor.addClickHandler(handler);
      }
  
      @Override
      public void setText(String text) {
          anchor.setText(text);
          disabledLabel.setText(text);
      }
  
      @Override
      public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) {
          return anchor.addMouseOverHandler(handler);
      }
  
      @Override
      public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) {
         return anchor.addMouseOutHandler(handler);
     }
 
     @Override
     public void init(String text) {
         init(text, ButtonStyle.PRIMARY);
     }
 
     @Override
     public void init(String text, ButtonStyle style) {
 
         this.currentStyle = style;
         disabledLabel.setText(text);
         anchor = new Anchor();
         if (currentStyle.getStyle() != null) {
             disabledLabel.setStyleName(currentStyle.getStyle());
             anchor.setStyleName(currentStyle.getStyle());
         }
         String disabledStyle = currentStyle.getDisabledStyle();
         if (disabledStyle == null) {
             disabledLabel.addStyleName("disabled");
         } else {
             disabledLabel.setStyleName(disabledStyle);
         }
         anchor.setText(text);
         anchor.setHref("javascript:return false;");
 
         panel.add(anchor);
         anchor.setTabIndex(0);
 
         this.initWidget(panel);
     }
 
     @Override
     public void addStyleName(String style) {
         anchor.addStyleName(style);
         disabledLabel.addStyleName(style);
     }
 
     @Override
     public void removeStyleName(String style) {
         anchor.removeStyleName(style);
         disabledLabel.removeStyleName(style);
     }
 
     @Override
     public void setStyleName(String style) {
         anchor.setStyleName(style);
         disabledLabel.setStyleName(style);
     }
 
     @Override
     public void init() {
         init("", ButtonStyle.PRIMARY);
     }
 
     @Override
     public void init(String text, ClickHandler handler) {
         init(text, ButtonStyle.PRIMARY);
         anchor.addClickHandler(handler);
     }
 
     public void init(String text, ButtonStyle style, ClickHandler handler) {
         init(text, style);
         anchor.addClickHandler(handler);
     }
 
     @Override
     protected void onEnsureDebugId(String baseID) {
         super.onEnsureDebugId(baseID);
         if (anchor != null) {
             anchor.ensureDebugId(DebugIdUtils.createWebDriverSafeDebugId(baseID + "-anchor"));
         }
     }
 
 }