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/**
 * Abstract shape element. Shape element represents some visual vector or raster object.
 * @constructor
 * @param {String} name Tag name of the element.
 * @param {Object} config Set of parameters to initialize element with.
 * @param {Object} style Object with styles to set on element initialization.
 */
jvm.AbstractShapeElement = function(name, config, style){
  this.style = style || {};
  this.style.current = this.style.current || {};
  this.isHovered = false;
  this.isSelected = false;
  this.updateStyle();
};

/**
 * Set element's style.
 * @param {Object|String} property Could be string to set only one property or object to set several style properties at once.
 * @param {String} value Value to set in case only one property should be set.
 */
jvm.AbstractShapeElement.prototype.setStyle = function(property, value){
  var styles = {};

if (typeof property === 'object') {
    styles = property;
  } else {
    styles[property] = value;
  }
  jvm.$.extend(this.style.current, styles);
  this.updateStyle();
};

jvm.AbstractShapeElement.prototype.updateStyle = function(){
  var attrs = {};

jvm.AbstractShapeElement.mergeStyles(attrs, this.style.initial);
  jvm.AbstractShapeElement.mergeStyles(attrs, this.style.current);
  if (this.isHovered) {
    jvm.AbstractShapeElement.mergeStyles(attrs, this.style.hover);
  }
  if (this.isSelected) {
    jvm.AbstractShapeElement.mergeStyles(attrs, this.style.selected);
    if (this.isHovered) {
      jvm.AbstractShapeElement.mergeStyles(attrs, this.style.selectedHover);
    }
  }
  this.set(attrs);
};

jvm.AbstractShapeElement.mergeStyles = function(styles, newStyles){
  var key;

newStyles = newStyles || {};
  for (key in newStyles) {
    if (newStyles[key] === null) {
      delete styles[key];
    } else {
      styles[key] = newStyles[key];
    }
  }
}

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