scratch-blocks/core/block_render_svg_vertical.js

/**
 * @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 Methods for graphically rendering a block as SVG.
 * @author fraser@google.com (Neil Fraser)
 */
'use strict';

goog.provide('Blockly.BlockSvg.render');

goog.require('Blockly.BlockSvg');


// UI constants for rendering blocks.
/**
 * Horizontal space between elements.
 * @const
 */
Blockly.BlockSvg.SEP_SPACE_X = 10;
/**
 * Vertical space between elements.
 * @const
 */
Blockly.BlockSvg.SEP_SPACE_Y = 10;
/**
 * Vertical padding around inline elements.
 * @const
 */
Blockly.BlockSvg.INLINE_PADDING_Y = 5;
/**
 * Minimum height of a block.
 * @const
 */
Blockly.BlockSvg.MIN_BLOCK_Y = 25;
/**
 * Height of horizontal puzzle tab.
 * @const
 */
Blockly.BlockSvg.TAB_HEIGHT = 20;
/**
 * Width of horizontal puzzle tab.
 * @const
 */
Blockly.BlockSvg.TAB_WIDTH = 8;
/**
 * Width of vertical tab (inc left margin).
 * @const
 */
Blockly.BlockSvg.NOTCH_WIDTH = 30;
/**
 * Rounded corner radius.
 * @const
 */
Blockly.BlockSvg.CORNER_RADIUS = 4;
/**
 * Do blocks with no previous or output connections have a 'hat' on top?
 * @const
 */
Blockly.BlockSvg.START_HAT = true;
/**
 * Path of the top hat's curve.
 * @const
 */
Blockly.BlockSvg.START_HAT_PATH = 'c 30,-15 70,-15 100,0';
/**
 * SVG path for drawing next/previous notch from left to right.
 * @const
 */
Blockly.BlockSvg.NOTCH_PATH_LEFT = 'l 6,4 3,0 6,-4';
/**
 * SVG path for drawing next/previous notch from right to left.
 * @const
 */
Blockly.BlockSvg.NOTCH_PATH_RIGHT = 'l -6,4 -3,0 -6,-4';
/**
 * SVG path for drawing a horizontal puzzle tab from top to bottom.
 * @const
 */
Blockly.BlockSvg.TAB_PATH_DOWN = 'v 5 c 0,10 -' + Blockly.BlockSvg.TAB_WIDTH +
    ',-8 -' + Blockly.BlockSvg.TAB_WIDTH + ',7.5 s ' +
    Blockly.BlockSvg.TAB_WIDTH + ',-2.5 ' + Blockly.BlockSvg.TAB_WIDTH + ',7.5';
/**
 * SVG start point for drawing the top-left corner.
 * @const
 */
Blockly.BlockSvg.TOP_LEFT_CORNER_START =
    'm 0,' + Blockly.BlockSvg.CORNER_RADIUS;
/**
 * SVG path for drawing the rounded top-left corner.
 * @const
 */
Blockly.BlockSvg.TOP_LEFT_CORNER =
    'A ' + Blockly.BlockSvg.CORNER_RADIUS + ',' +
    Blockly.BlockSvg.CORNER_RADIUS + ' 0 0,1 ' +
    Blockly.BlockSvg.CORNER_RADIUS + ',0';
/**
 * SVG path for drawing the top-left corner of a statement input.
 * Includes the top notch, a horizontal space, and the rounded inside corner.
 * @const
 */
Blockly.BlockSvg.INNER_TOP_LEFT_CORNER =
    Blockly.BlockSvg.NOTCH_PATH_RIGHT + ' h -' +
    (Blockly.BlockSvg.NOTCH_WIDTH - 15 - Blockly.BlockSvg.CORNER_RADIUS) +
    ' a ' + Blockly.BlockSvg.CORNER_RADIUS + ',' +
    Blockly.BlockSvg.CORNER_RADIUS + ' 0 0,0 -' +
    Blockly.BlockSvg.CORNER_RADIUS + ',' +
    Blockly.BlockSvg.CORNER_RADIUS;
/**
 * SVG path for drawing the bottom-left corner of a statement input.
 * Includes the rounded inside corner.
 * @const
 */
Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER =
    'a ' + Blockly.BlockSvg.CORNER_RADIUS + ',' +
    Blockly.BlockSvg.CORNER_RADIUS + ' 0 0,0 ' +
    Blockly.BlockSvg.CORNER_RADIUS + ',' +
    Blockly.BlockSvg.CORNER_RADIUS;

/**
 * Play some UI effects (sound, ripple) after a connection has been established.
 */
Blockly.BlockSvg.prototype.connectionUiEffect = function() {
  this.workspace.playAudio('click');
  if (this.workspace.scale < 1) {
    return;  // Too small to care about visual effects.
  }
  // Determine the absolute coordinates of the inferior block.
  var xy = Blockly.getSvgXY_(/** @type {!Element} */ (this.svgGroup_),
                             this.workspace);
  // Offset the coordinates based on the two connection types, fix scale.
  if (this.outputConnection) {
    xy.x += (this.RTL ? 3 : -3) * this.workspace.scale;
    xy.y += 13 * this.workspace.scale;
  } else if (this.previousConnection) {
    xy.x += (this.RTL ? -23 : 23) * this.workspace.scale;
    xy.y += 3 * this.workspace.scale;
  }
  var ripple = Blockly.createSvgElement('circle',
      {'cx': xy.x, 'cy': xy.y, 'r': 0, 'fill': 'none',
       'stroke': '#888', 'stroke-width': 10},
      this.workspace.getParentSvg());
  // Start the animation.
  Blockly.BlockSvg.connectionUiStep_(ripple, new Date(), this.workspace.scale);
};

/**
 * Expand a ripple around a connection.
 * @param {!Element} ripple Element to animate.
 * @param {!Date} start Date of animation's start.
 * @param {number} workspaceScale Scale of workspace.
 * @private
 */
Blockly.BlockSvg.connectionUiStep_ = function(ripple, start, workspaceScale) {
  var ms = (new Date()) - start;
  var percent = ms / 150;
  if (percent > 1) {
    goog.dom.removeNode(ripple);
  } else {
    ripple.setAttribute('r', percent * 25 * workspaceScale);
    ripple.style.opacity = 1 - percent;
    var closure = function() {
      Blockly.BlockSvg.connectionUiStep_(ripple, start, workspaceScale);
    };
    Blockly.BlockSvg.disconnectUiStop_.pid_ = setTimeout(closure, 10);
  }
};

/**
 * Change the colour of a block.
 */
Blockly.BlockSvg.prototype.updateColour = function() {
  // Render block fill
  var hexColour = this.getColour();
  var rgb = goog.color.hexToRgb(hexColour);
  if (this.isShadow()) {
    rgb = goog.color.lighten(rgb, 0.6);
    hexColour = goog.color.rgbArrayToHex(rgb);
  }
  this.svgPath_.setAttribute('fill', hexColour);

  // Render block stroke
  var colorShift = goog.color.darken(rgb, 0.1);
  var strokeColor = goog.color.rgbArrayToHex(colorShift);
  this.svgPath_.setAttribute('stroke', strokeColor);

  // Render icon(s) if applicable
  var icons = this.getIcons();
  for (var i = 0; i < icons.length; i++) {
    icons[i].updateColour();
  }

  // Bump every dropdown to change its colour.
  for (var x = 0, input; input = this.inputList[x]; x++) {
    for (var y = 0, field; field = input.fieldRow[y]; y++) {
      field.setText(null);
    }
  }
};

/**
 * Returns a bounding box describing the dimensions of this block
 * and any blocks stacked below it.
 * @return {!{height: number, width: number}} Object with height and width properties.
 */
Blockly.BlockSvg.prototype.getHeightWidth = function() {
  var height = this.height;
  var width = this.width;
  // Recursively add size of subsequent blocks.
  var nextBlock = this.getNextBlock();
  if (nextBlock) {
    var nextHeightWidth = nextBlock.getHeightWidth();
    height += nextHeightWidth.height - 4;  // Height of tab.
    width = Math.max(width, nextHeightWidth.width);
  } else if (!this.nextConnection && !this.outputConnection) {
    // Add a bit of margin under blocks with no bottom tab.
    height += 2;
  }
  return {height: height, width: width};
};

/**
 * Render the block.
 * Lays out and reflows a block based on its contents and settings.
 * @param {boolean=} opt_bubble If false, just render this block.
 *   If true, also render block's parent, grandparent, etc.  Defaults to true.
 */
Blockly.BlockSvg.prototype.render = function(opt_bubble) {
  Blockly.Field.startCache();
  this.rendered = true;

  var cursorX = Blockly.BlockSvg.SEP_SPACE_X;
  if (this.RTL) {
    cursorX = -cursorX;
  }
  // Move the icons into position.
  var icons = this.getIcons();
  for (var i = 0; i < icons.length; i++) {
    cursorX = icons[i].renderIcon(cursorX);
  }
  cursorX += this.RTL ?
      Blockly.BlockSvg.SEP_SPACE_X : -Blockly.BlockSvg.SEP_SPACE_X;
  // If there are no icons, cursorX will be 0, otherwise it will be the
  // width that the first label needs to move over by.

  var inputRows = this.renderCompute_(cursorX);
  this.renderDraw_(cursorX, inputRows);

  if (opt_bubble !== false) {
    // Render all blocks above this one (propagate a reflow).
    var parentBlock = this.getParent();
    if (parentBlock) {
      parentBlock.render(true);
    } else {
      // Top-most block.  Fire an event to allow scrollbars to resize.
      Blockly.fireUiEvent(window, 'resize');
    }
  }
  Blockly.Field.stopCache();
};

/**
 * Render a list of fields starting at the specified location.
 * @param {!Array.<!Blockly.Field>} fieldList List of fields.
 * @param {number} cursorX X-coordinate to start the fields.
 * @param {number} cursorY Y-coordinate to start the fields.
 * @return {number} X-coordinate of the end of the field row (plus a gap).
 * @private
 */
Blockly.BlockSvg.prototype.renderFields_ =
    function(fieldList, cursorX, cursorY) {
  cursorY += Blockly.BlockSvg.INLINE_PADDING_Y;
  if (this.RTL) {
    cursorX = -cursorX;
  }
  for (var t = 0, field; field = fieldList[t]; t++) {
    var root = field.getSvgRoot();
    if (!root) {
      continue;
    }
    if (this.RTL) {
      cursorX -= field.renderSep + field.renderWidth;
      root.setAttribute('transform',
          'translate(' + cursorX + ',' + cursorY + ')');
      if (field.renderWidth) {
        cursorX -= Blockly.BlockSvg.SEP_SPACE_X;
      }
    } else {
      root.setAttribute('transform',
          'translate(' + (cursorX + field.renderSep) + ',' + cursorY + ')');
      if (field.renderWidth) {
        cursorX += field.renderSep + field.renderWidth +
            Blockly.BlockSvg.SEP_SPACE_X;
      }
    }
  }
  return this.RTL ? -cursorX : cursorX;
};

/**
 * Computes the height and widths for each row and field.
 * @param {number} iconWidth Offset of first row due to icons.
 * @return {!Array.<!Array.<!Object>>} 2D array of objects, each containing
 *     position information.
 * @private
 */
Blockly.BlockSvg.prototype.renderCompute_ = function(iconWidth) {
  var inputList = this.inputList;
  var inputRows = [];
  inputRows.rightEdge = iconWidth + Blockly.BlockSvg.SEP_SPACE_X * 2;
  if (this.previousConnection || this.nextConnection) {
    inputRows.rightEdge = Math.max(inputRows.rightEdge,
        Blockly.BlockSvg.NOTCH_WIDTH + Blockly.BlockSvg.SEP_SPACE_X);
  }
  var fieldValueWidth = 0;  // Width of longest external value field.
  var fieldStatementWidth = 0;  // Width of longest statement field.
  var hasValue = false;
  var hasStatement = false;
  var hasDummy = false;
  var lastType = undefined;

  for (var i = 0, input; input = inputList[i]; i++) {
    if (!input.isVisible()) {
      continue;
    }
    var row;
    if (!lastType ||
        lastType == Blockly.NEXT_STATEMENT ||
        input.type == Blockly.NEXT_STATEMENT) {
      // Create new row.
      lastType = input.type;
      row = [];
      if (input.type != Blockly.NEXT_STATEMENT) {
        row.type = Blockly.BlockSvg.INLINE;
      } else {
        row.type = input.type;
      }
      row.height = 0;
      inputRows.push(row);
    } else {
      row = inputRows[inputRows.length - 1];
    }
    row.push(input);

    // Compute minimum input size.
    input.renderHeight = Blockly.BlockSvg.MIN_BLOCK_Y;
    // The width is currently only needed for inline value inputs.
    if (input.type == Blockly.INPUT_VALUE) {
      input.renderWidth = Blockly.BlockSvg.TAB_WIDTH +
          Blockly.BlockSvg.SEP_SPACE_X * 1.25;
    } else {
      input.renderWidth = 0;
    }
    // Expand input size if there is a connection.
    if (input.connection && input.connection.targetConnection) {
      var linkedBlock = input.connection.targetBlock();
      var bBox = linkedBlock.getHeightWidth();
      input.renderHeight = Math.max(input.renderHeight, bBox.height);
      input.renderWidth = Math.max(input.renderWidth, bBox.width);
    }
    // Blocks have a one pixel shadow that should sometimes overhang.
    if (i == inputList.length - 1) {
      // Last value input should overhang.
      input.renderHeight--;
    } else if (input.type == Blockly.INPUT_VALUE &&
        inputList[i + 1] && inputList[i + 1].type == Blockly.NEXT_STATEMENT) {
      // Value input above statement input should overhang.
      input.renderHeight--;
    }

    row.height = Math.max(row.height, input.renderHeight);
    input.fieldWidth = 0;
    if (inputRows.length == 1) {
      // The first row gets shifted to accommodate any icons.
      input.fieldWidth += this.RTL ? -iconWidth : iconWidth;
    }
    var previousFieldEditable = false;
    for (var j = 0, field; field = input.fieldRow[j]; j++) {
      if (j != 0) {
        input.fieldWidth += Blockly.BlockSvg.SEP_SPACE_X;
      }
      // Get the dimensions of the field.
      var fieldSize = field.getSize();
      field.renderWidth = fieldSize.width;
      field.renderSep = (previousFieldEditable && field.EDITABLE) ?
          Blockly.BlockSvg.SEP_SPACE_X : 0;
      input.fieldWidth += field.renderWidth + field.renderSep;
      row.height = Math.max(row.height, fieldSize.height);
      previousFieldEditable = field.EDITABLE;
    }

    if (row.type != Blockly.BlockSvg.INLINE) {
      if (row.type == Blockly.NEXT_STATEMENT) {
        hasStatement = true;
        fieldStatementWidth = Math.max(fieldStatementWidth, input.fieldWidth);
      } else {
        if (row.type == Blockly.INPUT_VALUE) {
          hasValue = true;
        } else if (row.type == Blockly.DUMMY_INPUT) {
          hasDummy = true;
        }
        fieldValueWidth = Math.max(fieldValueWidth, input.fieldWidth);
      }
    }
  }

  // Make inline rows a bit thicker in order to enclose the values.
  for (var y = 0, row; row = inputRows[y]; y++) {
    row.thicker = false;
    if (row.type == Blockly.BlockSvg.INLINE) {
      for (var z = 0, input; input = row[z]; z++) {
        if (input.type == Blockly.INPUT_VALUE) {
          row.height += 2 * Blockly.BlockSvg.INLINE_PADDING_Y;
          row.thicker = true;
          break;
        }
      }
    }
  }

  // Compute the statement edge.
  // This is the width of a block where statements are nested.
  inputRows.statementEdge = 2 * Blockly.BlockSvg.SEP_SPACE_X +
      fieldStatementWidth;
  // Compute the preferred right edge.  Inline blocks may extend beyond.
  // This is the width of the block where external inputs connect.
  if (hasStatement) {
    inputRows.rightEdge = Math.max(inputRows.rightEdge,
        inputRows.statementEdge + Blockly.BlockSvg.NOTCH_WIDTH);
  }
  if (hasValue) {
    inputRows.rightEdge = Math.max(inputRows.rightEdge, fieldValueWidth +
        Blockly.BlockSvg.SEP_SPACE_X * 2 + Blockly.BlockSvg.TAB_WIDTH);
  } else if (hasDummy) {
    inputRows.rightEdge = Math.max(inputRows.rightEdge, fieldValueWidth +
        Blockly.BlockSvg.SEP_SPACE_X * 2);
  }

  inputRows.hasValue = hasValue;
  inputRows.hasStatement = hasStatement;
  inputRows.hasDummy = hasDummy;
  return inputRows;
};


/**
 * Draw the path of the block.
 * Move the fields to the correct locations.
 * @param {number} iconWidth Offset of first row due to icons.
 * @param {!Array.<!Array.<!Object>>} inputRows 2D array of objects, each
 *     containing position information.
 * @private
 */
Blockly.BlockSvg.prototype.renderDraw_ = function(iconWidth, inputRows) {
  this.startHat_ = false;
  // Should the top and bottom left corners be rounded or square?
  if (this.outputConnection) {
    this.squareTopLeftCorner_ = true;
    this.squareBottomLeftCorner_ = true;
  } else {
    this.squareTopLeftCorner_ = false;
    this.squareBottomLeftCorner_ = false;
    // If this block is in the middle of a stack, square the corners.
    if (this.previousConnection) {
      var prevBlock = this.previousConnection.targetBlock();
      if (prevBlock && prevBlock.getNextBlock() == this) {
        this.squareTopLeftCorner_ = true;
       }
    } else if (Blockly.BlockSvg.START_HAT) {
      // No output or previous connection.
      this.squareTopLeftCorner_ = true;
      this.startHat_ = true;
      inputRows.rightEdge = Math.max(inputRows.rightEdge, 100);
    }
    var nextBlock = this.getNextBlock();
    if (nextBlock) {
      this.squareBottomLeftCorner_ = true;
    }
  }

  // Fetch the block's coordinates on the surface for use in anchoring
  // the connections.
  var connectionsXY = this.getRelativeToSurfaceXY();

  // Assemble the block's path.
  var steps = [];

  this.renderDrawTop_(steps, connectionsXY,
      inputRows.rightEdge);
  var cursorY = this.renderDrawRight_(steps,
      connectionsXY, inputRows, iconWidth);
  this.renderDrawBottom_(steps, connectionsXY, cursorY);
  this.renderDrawLeft_(steps, connectionsXY, cursorY);

  var pathString = steps.join(' ');
  this.svgPath_.setAttribute('d', pathString);

  if (this.RTL) {
    // Mirror the block's path.
    // This is awesome.
    this.svgPath_.setAttribute('transform', 'scale(-1 1)');
  }
};

/**
 * Render the top edge of the block.
 * @param {!Array.<string>} steps Path of block outline.
 * @param {!Object} connectionsXY Location of block.
 * @param {number} rightEdge Minimum width of block.
 * @private
 */
Blockly.BlockSvg.prototype.renderDrawTop_ =
    function(steps, connectionsXY, rightEdge) {
  // Position the cursor at the top-left starting point.
  if (this.squareTopLeftCorner_) {
    steps.push('m 0,0');
    if (this.startHat_) {
      steps.push(Blockly.BlockSvg.START_HAT_PATH);
    }
  } else {
    steps.push(Blockly.BlockSvg.TOP_LEFT_CORNER_START);
    // Top-left rounded corner.
    steps.push(Blockly.BlockSvg.TOP_LEFT_CORNER);
  }

  // Top edge.
  if (this.previousConnection) {
    steps.push('H', Blockly.BlockSvg.NOTCH_WIDTH - 15);
    steps.push(Blockly.BlockSvg.NOTCH_PATH_LEFT);
    // Create previous block connection.
    var connectionX = connectionsXY.x + (this.RTL ?
        -Blockly.BlockSvg.NOTCH_WIDTH : Blockly.BlockSvg.NOTCH_WIDTH);
    var connectionY = connectionsXY.y;
    this.previousConnection.moveTo(connectionX, connectionY);
    // This connection will be tightened when the parent renders.
  }
  steps.push('H', rightEdge);
  this.width = rightEdge;
};

/**
 * Render the right edge of the block.
 * @param {!Array.<string>} steps Path of block outline.
 * @param {!Object} connectionsXY Location of block.
 * @param {!Array.<!Array.<!Object>>} inputRows 2D array of objects, each
 *     containing position information.
 * @param {number} iconWidth Offset of first row due to icons.
 * @return {number} Height of block.
 * @private
 */
Blockly.BlockSvg.prototype.renderDrawRight_ = function(steps,
    connectionsXY, inputRows, iconWidth) {
  var cursorX;
  var cursorY = 0;
  var connectionX, connectionY;
  for (var y = 0, row; row = inputRows[y]; y++) {
    cursorX = Blockly.BlockSvg.SEP_SPACE_X;
    if (y == 0) {
      cursorX += this.RTL ? -iconWidth : iconWidth;
    }

    if (row.type == Blockly.BlockSvg.INLINE) {
      // Inline inputs.
      for (var x = 0, input; input = row[x]; x++) {
        var fieldX = cursorX;
        var fieldY = cursorY;
        if (row.thicker) {
          // Lower the field slightly.
          fieldY += Blockly.BlockSvg.INLINE_PADDING_Y;
        }
        // TODO: Align inline field rows (left/right/centre).
        cursorX = this.renderFields_(input.fieldRow, fieldX, fieldY);
        if (input.type != Blockly.DUMMY_INPUT) {
          cursorX += input.renderWidth + Blockly.BlockSvg.SEP_SPACE_X;
        }
        if (input.type == Blockly.INPUT_VALUE) {
          // Create inline input connection.
          if (this.RTL) {
            connectionX = connectionsXY.x - cursorX -
                Blockly.BlockSvg.TAB_WIDTH + Blockly.BlockSvg.SEP_SPACE_X +
                input.renderWidth + 1;
          } else {
            connectionX = connectionsXY.x + cursorX +
                Blockly.BlockSvg.TAB_WIDTH - Blockly.BlockSvg.SEP_SPACE_X -
                input.renderWidth - 1;
          }
          connectionY = connectionsXY.y + cursorY +
              Blockly.BlockSvg.INLINE_PADDING_Y + 1;
          input.connection.moveTo(connectionX, connectionY);
          if (input.connection.targetConnection) {
            input.connection.tighten_();
          }
        }
      }

      cursorX = Math.max(cursorX, inputRows.rightEdge);
      this.width = Math.max(this.width, cursorX);
      steps.push('H', cursorX);
      steps.push('v', row.height);
    } else if (row.type == Blockly.DUMMY_INPUT) {
      // External naked field.
      var input = row[0];
      var fieldX = cursorX;
      var fieldY = cursorY;
      if (input.align != Blockly.ALIGN_LEFT) {
        var fieldRightX = inputRows.rightEdge - input.fieldWidth -
            2 * Blockly.BlockSvg.SEP_SPACE_X;
        if (inputRows.hasValue) {
          fieldRightX -= Blockly.BlockSvg.TAB_WIDTH;
        }
        if (input.align == Blockly.ALIGN_RIGHT) {
          fieldX += fieldRightX;
        } else if (input.align == Blockly.ALIGN_CENTRE) {
          fieldX += fieldRightX / 2;
        }
      }
      this.renderFields_(input.fieldRow, fieldX, fieldY);
      steps.push('v', row.height);
    } else if (row.type == Blockly.NEXT_STATEMENT) {
      // Nested statement.
      var input = row[0];
      if (y == 0) {
        // If the first input is a statement stack, add a small row on top.
        steps.push('v', Blockly.BlockSvg.SEP_SPACE_Y);
        cursorY += Blockly.BlockSvg.SEP_SPACE_Y;
      }
      var fieldX = cursorX;
      var fieldY = cursorY;
      if (input.align != Blockly.ALIGN_LEFT) {
        var fieldRightX = inputRows.statementEdge - input.fieldWidth -
            2 * Blockly.BlockSvg.SEP_SPACE_X;
        if (input.align == Blockly.ALIGN_RIGHT) {
          fieldX += fieldRightX;
        } else if (input.align == Blockly.ALIGN_CENTRE) {
          fieldX += fieldRightX / 2;
        }
      }
      this.renderFields_(input.fieldRow, fieldX, fieldY);
      cursorX = inputRows.statementEdge + Blockly.BlockSvg.NOTCH_WIDTH;
      steps.push('H', cursorX);
      steps.push(Blockly.BlockSvg.INNER_TOP_LEFT_CORNER);
      steps.push('v', row.height - 2 * Blockly.BlockSvg.CORNER_RADIUS);
      steps.push(Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER);
      steps.push('H', inputRows.rightEdge);

      // Create statement connection.
      connectionX = connectionsXY.x + (this.RTL ? -cursorX : cursorX + 1);
      connectionY = connectionsXY.y + cursorY + 1;
      input.connection.moveTo(connectionX, connectionY);
      if (input.connection.targetConnection) {
        input.connection.tighten_();
        this.width = Math.max(this.width, inputRows.statementEdge +
            input.connection.targetBlock().getHeightWidth().width);
      }
      if (y == inputRows.length - 1 ||
          inputRows[y + 1].type == Blockly.NEXT_STATEMENT) {
        // If the final input is a statement stack, add a small row underneath.
        // Consecutive statement stacks are also separated by a small divider.
        steps.push('v', Blockly.BlockSvg.SEP_SPACE_Y);
        cursorY += Blockly.BlockSvg.SEP_SPACE_Y;
      }
    }
    cursorY += row.height;
  }
  if (!inputRows.length) {
    cursorY = Blockly.BlockSvg.MIN_BLOCK_Y;
    steps.push('V', cursorY);
  }
  return cursorY;
};

/**
 * Render the bottom edge of the block.
 * @param {!Array.<string>} steps Path of block outline.
 * @param {!Object} connectionsXY Location of block.
 * @param {number} cursorY Height of block.
 * @private
 */
Blockly.BlockSvg.prototype.renderDrawBottom_ =
    function(steps, connectionsXY, cursorY) {
  this.height = cursorY + 1;  // Add one for the shadow.
  if (this.nextConnection) {
    steps.push('H', (Blockly.BlockSvg.NOTCH_WIDTH + (this.RTL ? 0.5 : - 0.5)) +
        ' ' + Blockly.BlockSvg.NOTCH_PATH_RIGHT);
    // Create next block connection.
    var connectionX;
    if (this.RTL) {
      connectionX = connectionsXY.x - Blockly.BlockSvg.NOTCH_WIDTH;
    } else {
      connectionX = connectionsXY.x + Blockly.BlockSvg.NOTCH_WIDTH;
    }
    var connectionY = connectionsXY.y + cursorY + 1;
    this.nextConnection.moveTo(connectionX, connectionY);
    if (this.nextConnection.targetConnection) {
      this.nextConnection.tighten_();
    }
    this.height += 4;  // Height of tab.
  }

  // Should the bottom-left corner be rounded or square?
  if (this.squareBottomLeftCorner_) {
    steps.push('H 0');
  } else {
    steps.push('H', Blockly.BlockSvg.CORNER_RADIUS);
    steps.push('a', Blockly.BlockSvg.CORNER_RADIUS + ',' +
               Blockly.BlockSvg.CORNER_RADIUS + ' 0 0,1 -' +
               Blockly.BlockSvg.CORNER_RADIUS + ',-' +
               Blockly.BlockSvg.CORNER_RADIUS);
  }
};

/**
 * Render the left edge of the block.
 * @param {!Array.<string>} steps Path of block outline.
 * @param {!Object} connectionsXY Location of block.
 * @param {number} cursorY Height of block.
 * @private
 */
Blockly.BlockSvg.prototype.renderDrawLeft_ =
    function(steps, connectionsXY, cursorY) {
  if (this.outputConnection) {
    // Create output connection.
    this.outputConnection.moveTo(connectionsXY.x, connectionsXY.y);
    // This connection will be tightened when the parent renders.
    if (this.outputConnection.getOutputShape() === Blockly.Connection.NUMBER) {
        steps.push('V', Blockly.BlockSvg.TAB_HEIGHT);
        steps.push('c 0,-10 -' + Blockly.BlockSvg.TAB_WIDTH + ',8 -' +
            Blockly.BlockSvg.TAB_WIDTH + ',-7.5 s ' + Blockly.BlockSvg.TAB_WIDTH +
            ',2.5 ' + Blockly.BlockSvg.TAB_WIDTH + ',-7.5');
        this.width += Blockly.BlockSvg.TAB_WIDTH;
    }
  }
  steps.push('z');
};