text: /**
   * @license
   * Visual Blocks Editor
   *
   * Copyright 2012 Google Inc.
   * https://developers.google.com/blockly/
   *
   * Licensed under the Apache 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.apache.org/licenses/LICENSE-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.
   */
  
  /**
   * @fileoverview Non-editable text field.  Used for titles, labels, etc.
   * @author fraser@google.com (Neil Fraser)
   */
  'use strict';
  
  goog.provide('Blockly.FieldLabel');
  
  goog.require('Blockly.Field');
  goog.require('Blockly.Tooltip');
  goog.require('goog.dom');
  goog.require('goog.math.Size');
  
  
  /**
   * Class for a non-editable field.
   * @param {string} text The initial content of the field.
   * @param {string=} opt_class Optional CSS class for the field's text.
   * @extends {Blockly.Field}
   * @constructor
   */
  Blockly.FieldLabel = function(text, opt_class) {
    this.size_ = new goog.math.Size(0, 0);
    this.class_ = opt_class;
    this.setValue(text);
  };
  goog.inherits(Blockly.FieldLabel, Blockly.Field);
  
  /**
   * Editable fields are saved by the XML renderer, non-editable fields are not.
   */
  Blockly.FieldLabel.prototype.EDITABLE = false;
  
  /**
   * Install this text on a block.
   */
  Blockly.FieldLabel.prototype.init = function() {
    if (this.textElement_) {
      // Text has already been initialized once.
      return;
    }
    // Build the DOM.
    /** @private {SVGElement}  */
    this.textElement_ = Blockly.utils.createSvgElement('text',
        {'class': 'blocklyText',
        'y': Blockly.BlockSvg.FIELD_TOP_PADDING,
        'text-anchor': 'middle',
        'dominant-baseline': 'middle'
      }, null);
    if (this.class_) {
      Blockly.utils.addClass(this.textElement_, this.class_);
    }
    if (!this.visible) {
      this.textElement_.style.display = 'none';
    }
    this.sourceBlock.getSvgRoot().appendChild(this.textElement_);
  
    // Configure the field to be transparent with respect to tooltips.
    this.textElement_.tooltip = this.sourceBlock;
    Blockly.Tooltip.bindMouseEvents(this.textElement_);
    // Force a render.
    this.render();
  };
  
  /**
   * Dispose of all DOM objects belonging to this text.
   */
  Blockly.FieldLabel.prototype.dispose = function() {
    goog.dom.removeNode(this.textElement_);
    this.textElement_ = null;
  };
  
  /**
   * Gets the group element for this field.
   * Used for measuring the size and for positioning.
   * @return {!Element} The group element.
   */
  Blockly.FieldLabel.prototype.getSvgRoot = function() {
    return /** @type {!Element} */ (this.textElement_);
  };
  
  /**
   * Change the tooltip text for this field.
   * @param {string|!Element} newTip Text for tooltip or a parent element to
   *     link to for its tooltip.
   */
  Blockly.FieldLabel.prototype.setTooltip = function(newTip) {
    this.textElement_.tooltip = newTip;
  };
  