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package com.googlecode.gwt.test.utils;

import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.ui.UIObject;
import com.googlecode.gwt.test.internal.utils.JsoProperties;

/**
 * Classe which provides utilies on GWT DOM stuff.
 * 
 * @author Gael Lazzari
 * 
 */
public class GwtDomUtils {

   /**
    * Gets all of the element's style names, as a space-separated list.
    * 
    * @param elem the element whose style is to be retrieved
    * @return the objects's space-separated style names
    */
   public static String getStyleName(Element element) {
      return element.getPropertyString("className");
   }

   /**
    * Gets the element's primary style name.
    * 
    * @param elem the element whose primary style name is to be retrieved
    * @return the element's primary style name
    */
   public static String getStylePrimaryName(Element elem) {
      // copied from protected static UiObject method
      String fullClassName = getStyleName(elem);

      // The primary style name is always the first token of the full CSS class
      // name. There can be no leading whitespace in the class name, so it's not
      // necessary to trim() it.
      int spaceIdx = fullClassName.indexOf(' ');
      if (spaceIdx >= 0) {
         return fullClassName.substring(0, spaceIdx);
      }
      return fullClassName;
   }

   public static boolean hasStyle(Element element, String styleName) {
      return getStyleName(element).contains(styleName);
   }

   public static boolean isVisible(Element element) {
      if (!UIObject.isVisible(element)) {
         return false;
      } else if (element.getParentElement() != null) {
         return isVisible(element.getParentElement());
      } else {
         return true;
      }
   }

   /**
    * Manually set a DOM element height.
    * 
    * @param element The targeted element.
    * @param height The height value.
    */
   public static void setClientHeight(Element element, int height) {
      JavaScriptObjects.setProperty(element, JsoProperties.ELEMENT_CLIENT_HEIGHT, height);
   }

   /**
    * Manually set a DOM element width.
    * 
    * @param element The targeted element.
    * @param width The width value.
    */
   public static void setClientWidth(Element element, int width) {
      JavaScriptObjects.setProperty(element, JsoProperties.ELEMENT_CLIENT_WIDTH, width);
   }

}