text: /**
   * @license
   * Visual Blocks Editor
   *
   * Copyright 2016 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 Blockly constants.
   * @author fenichel@google.com (Rachel Fenichel)
   */
  'use strict';
  
  goog.provide('Blockly.constants');
  
  
  /**
   * Number of pixels the mouse must move before a drag starts.
   */
  Blockly.DRAG_RADIUS = 5;
  
  /**
   * Number of pixels the mouse must move before a drag/scroll starts from the
   * flyout.  Because the drag-intention is determined when this is reached, it is
   * larger than Blockly.DRAG_RADIUS so that the drag-direction is clearer.
   */
  Blockly.FLYOUT_DRAG_RADIUS = 10;
  
  /**
   * Maximum misalignment between connections for them to snap together.
   */
  Blockly.SNAP_RADIUS = 20;
  
  /**
   * Delay in ms between trigger and bumping unconnected block out of alignment.
   */
  Blockly.BUMP_DELAY = 250;
  
  /**
   * Number of characters to truncate a collapsed block to.
   */
  Blockly.COLLAPSE_CHARS = 30;
  
  /**
   * Length in ms for a touch to become a long press.
   */
  Blockly.LONGPRESS = 750;
  
  /**
   * Prevent a sound from playing if another sound preceded it within this many
   * milliseconds.
   */
  Blockly.SOUND_LIMIT = 100;
  
  /**
   * When dragging a block out of a stack, split the stack in two (true), or drag
   * out the block healing the stack (false).
   */
  Blockly.DRAG_STACK = true;
  
  /**
   * The richness of block colours, regardless of the hue.
   * Must be in the range of 0 (inclusive) to 1 (exclusive).
   */
  Blockly.HSV_SATURATION = 0.45;
  
  /**
   * The intensity of block colours, regardless of the hue.
   * Must be in the range of 0 (inclusive) to 1 (exclusive).
   */
  Blockly.HSV_VALUE = 0.65;
  
  /**
   * Sprited icons and images.
   */
  Blockly.SPRITE = {
    width: 96,
    height: 124,
    url: 'sprites.png'
  };
  
  // Constants below this point are not intended to be changed.
  
  /**
   * Required name space for SVG elements.
   * @const
   */
  Blockly.SVG_NS = 'http://www.w3.org/2000/svg';
  
  /**
   * Required name space for HTML elements.
   * @const
   */
  Blockly.HTML_NS = 'http://www.w3.org/1999/xhtml';
  
  /**
   * ENUM for a right-facing value input.  E.g. 'set item to' or 'return'.
   * @const
   */
  Blockly.INPUT_VALUE = 1;
  
  /**
   * ENUM for a left-facing value output.  E.g. 'random fraction'.
   * @const
   */
  Blockly.OUTPUT_VALUE = 2;
  
  /**
   * ENUM for a down-facing block stack.  E.g. 'if-do' or 'else'.
   * @const
   */
  Blockly.NEXT_STATEMENT = 3;
  
  /**
   * ENUM for an up-facing block stack.  E.g. 'break out of loop'.
   * @const
   */
  Blockly.PREVIOUS_STATEMENT = 4;
  
  /**
   * ENUM for an dummy input.  Used to add field(s) with no input.
   * @const
   */
  Blockly.DUMMY_INPUT = 5;
  
  /**
   * ENUM for left alignment.
   * @const
   */
  Blockly.ALIGN_LEFT = -1;
  
  /**
   * ENUM for centre alignment.
   * @const
   */
  Blockly.ALIGN_CENTRE = 0;
  
  /**
   * ENUM for right alignment.
   * @const
   */
  Blockly.ALIGN_RIGHT = 1;
  
  /**
   * ENUM for no drag operation.
   * @const
   */
  Blockly.DRAG_NONE = 0;
  
  /**
   * ENUM for inside the sticky DRAG_RADIUS.
   * @const
   */
  Blockly.DRAG_STICKY = 1;
  
  /**
   * ENUM for inside the non-sticky DRAG_RADIUS, for differentiating between
   * clicks and drags.
   * @const
   */
  Blockly.DRAG_BEGIN = 1;
  
  /**
   * ENUM for freely draggable (outside the DRAG_RADIUS, if one applies).
   * @const
   */
  Blockly.DRAG_FREE = 2;
  
  /**
   * Lookup table for determining the opposite type of a connection.
   * @const
   */
  Blockly.OPPOSITE_TYPE = [];
  Blockly.OPPOSITE_TYPE[Blockly.INPUT_VALUE] = Blockly.OUTPUT_VALUE;
  Blockly.OPPOSITE_TYPE[Blockly.OUTPUT_VALUE] = Blockly.INPUT_VALUE;
  Blockly.OPPOSITE_TYPE[Blockly.NEXT_STATEMENT] = Blockly.PREVIOUS_STATEMENT;
  Blockly.OPPOSITE_TYPE[Blockly.PREVIOUS_STATEMENT] = Blockly.NEXT_STATEMENT;
  
  
  /**
   * ENUM for toolbox and flyout at top of screen.
   * @const
   */
  Blockly.TOOLBOX_AT_TOP = 0;
  
  /**
   * ENUM for toolbox and flyout at bottom of screen.
   * @const
   */
  Blockly.TOOLBOX_AT_BOTTOM = 1;
  
  /**
   * ENUM for toolbox and flyout at left of screen.
   * @const
   */
  Blockly.TOOLBOX_AT_LEFT = 2;
  
  /**
   * ENUM for toolbox and flyout at right of screen.
   * @const
   */
  Blockly.TOOLBOX_AT_RIGHT = 3;
  
  /**
   * ENUM representing that an event is not in any delete areas.
   * Null for backwards compatibility reasons.
   * @const
   */
  Blockly.DELETE_AREA_NONE = null;
  
  /**
   * ENUM representing that an event is in the delete area of the trash can.
   * @const
   */
  Blockly.DELETE_AREA_TRASH = 1;
  
  /**
   * ENUM representing that an event is in the delete area of the toolbox or
   * flyout.
   * @const
   */
  Blockly.DELETE_AREA_TOOLBOX = 2;
  
  /**
   * String for use in the "custom" attribute of a category in toolbox xml.
   * This string indicates that the category should be dynamically populated with
   * variable blocks.
   * @const {string}
   */
  Blockly.VARIABLE_CATEGORY_NAME = 'VARIABLE';
  
  /**
   * String for use in the "custom" attribute of a category in toolbox xml.
   * This string indicates that the category should be dynamically populated with
   * procedure blocks.
   * @const {string}
   */
  Blockly.PROCEDURE_CATEGORY_NAME = 'PROCEDURE';
  
  /**
   * String for use in the dropdown created in field_variable.
   * This string indicates that this option in the dropdown is 'Rename
   * variable...' and if selected, should trigger the prompt to rename a variable.
   * @const {string}
   */
  Blockly.RENAME_VARIABLE_ID = 'RENAME_VARIABLE_ID';
  
  /**
   * String for use in the dropdown created in field_variable.
   * This string indicates that this option in the dropdown is 'Delete the "%1"
   * variable' and if selected, should trigger the prompt to delete a variable.
   * @const {string}
   */
  Blockly.DELETE_VARIABLE_ID = 'DELETE_VARIABLE_ID';
  