diff --git a/core/block.js b/core/block.js
index b89c402f0..5abefe053 100644
--- a/core/block.js
+++ b/core/block.js
@@ -302,7 +302,7 @@ Blockly.Block.prototype.bumpNeighbours_ = function() {
   if (!this.workspace) {
     return;  // Deleted block.
   }
-  if (Blockly.dragMode_ != 0) {
+  if (Blockly.dragMode_ != Blockly.DRAG_NONE) {
     return;  // Don't bump blocks during a drag.
   }
   var rootBlock = this.getRootBlock();
diff --git a/core/block_svg.js b/core/block_svg.js
index 1cb17891d..f31bbf035 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -222,7 +222,7 @@ Blockly.BlockSvg.terminateDrag_ = function() {
     Blockly.BlockSvg.onMouseMoveWrapper_ = null;
   }
   var selected = Blockly.selected;
-  if (Blockly.dragMode_ == 2) {
+  if (Blockly.dragMode_ == Blockly.DRAG_FREE) {
     // Terminate a drag operation.
     if (selected) {
       // Update the connection locations.
@@ -253,7 +253,7 @@ Blockly.BlockSvg.terminateDrag_ = function() {
       Blockly.fireUiEvent(window, 'resize');
     }
   }
-  Blockly.dragMode_ = 0;
+  Blockly.dragMode_ = Blockly.DRAG_NONE;
   Blockly.Css.setCursor(Blockly.Css.Cursor.OPEN);
 };
 
@@ -330,7 +330,7 @@ Blockly.BlockSvg.prototype.snapToGrid = function() {
   if (!this.workspace) {
     return;  // Deleted block.
   }
-  if (Blockly.dragMode_ != 0) {
+  if (Blockly.dragMode_ != Blockly.DRAG_NONE) {
     return;  // Don't bump blocks during a drag.
   }
   if (this.getParent()) {
@@ -530,7 +530,7 @@ Blockly.BlockSvg.prototype.onMouseDown_ = function(e) {
     this.dragStartXY_ = this.getRelativeToSurfaceXY();
     this.workspace.startDrag(e, this.dragStartXY_.x, this.dragStartXY_.y);
 
-    Blockly.dragMode_ = 1;
+    Blockly.dragMode_ = Blockly.DRAG_STICKY;
     Blockly.BlockSvg.onMouseUpWrapper_ = Blockly.bindEvent_(document,
         'mouseup', this, this.onMouseUp_);
     Blockly.BlockSvg.onMouseMoveWrapper_ = Blockly.bindEvent_(document,
@@ -559,7 +559,7 @@ Blockly.BlockSvg.prototype.onMouseDown_ = function(e) {
  * @private
  */
 Blockly.BlockSvg.prototype.onMouseUp_ = function(e) {
-  if (Blockly.dragMode_ != 2) {
+  if (Blockly.dragMode_ != Blockly.DRAG_FREE) {
     Blockly.Events.fire(
         new Blockly.Events.Ui(this, 'click', undefined, undefined));
   }
@@ -781,6 +781,9 @@ Blockly.BlockSvg.prototype.moveConnections_ = function(dx, dy) {
  */
 Blockly.BlockSvg.prototype.setDragging_ = function(adding) {
   if (adding) {
+    var group = this.getSvgRoot();
+    group.translate_ = '';
+    group.skew_ = '';
     this.addDragging();
   } else {
     this.removeDragging();
@@ -811,16 +814,13 @@ Blockly.BlockSvg.prototype.onMouseMove_ = function(e) {
   var oldXY = this.getRelativeToSurfaceXY();
   var newXY = this.workspace.moveDrag(e);
 
-  var group = this.getSvgRoot();
-  if (Blockly.dragMode_ == 1) {
+  if (Blockly.dragMode_ == Blockly.DRAG_STICKY) {
     // Still dragging within the sticky DRAG_RADIUS.
     var dr = goog.math.Coordinate.distance(oldXY, newXY) * this.workspace.scale;
     if (dr > Blockly.DRAG_RADIUS) {
       // Switch to unrestricted dragging.
-      Blockly.dragMode_ = 2;
+      Blockly.dragMode_ = Blockly.DRAG_FREE;
       Blockly.longStop_();
-      group.translate_ = '';
-      group.skew_ = '';
       if (this.parentBlock_) {
         // Push this block to the very top of the stack.
         this.unplug();
@@ -829,10 +829,11 @@ Blockly.BlockSvg.prototype.onMouseMove_ = function(e) {
       this.setDragging_(true);
     }
   }
-  if (Blockly.dragMode_ == 2) {
+  if (Blockly.dragMode_ == Blockly.DRAG_FREE) {
     // Unrestricted dragging.
     var dx = oldXY.x - this.dragStartXY_.x;
     var dy = oldXY.y - this.dragStartXY_.y;
+    var group = this.getSvgRoot();
     group.translate_ = 'translate(' + newXY.x + ',' + newXY.y + ')';
     group.setAttribute('transform', group.translate_ + group.skew_);
     // Drag all the nested bubbles.
@@ -1281,7 +1282,7 @@ Blockly.BlockSvg.prototype.setWarningText = function(text, opt_id) {
     clearTimeout(this.setWarningText.pid_[id]);
     delete this.setWarningText.pid_[id];
   }
-  if (Blockly.dragMode_ == 2) {
+  if (Blockly.dragMode_ == Blockly.DRAG_FREE) {
     // Don't change the warning text during a drag.
     // Wait until the drag finishes.
     var thisBlock = this;
diff --git a/core/blockly.js b/core/blockly.js
index 67213067a..608909d90 100644
--- a/core/blockly.js
+++ b/core/blockly.js
@@ -103,7 +103,7 @@ Blockly.clipboardSource_ = null;
  * 2 - Freely draggable.
  * @private
  */
-Blockly.dragMode_ = 0;
+Blockly.dragMode_ = Blockly.DRAG_NONE;
 
 /**
  * Wrapper function called when a touch mouseUp occurs during a drag operation.
@@ -269,7 +269,7 @@ Blockly.onKeyDown_ = function(e) {
   if (deleteBlock) {
     // Common code for delete and cut.
     Blockly.hideChaff();
-    var heal = Blockly.dragMode_ != 2;
+    var heal = Blockly.dragMode_ != Blockly.DRAG_FREE;
     Blockly.selected.dispose(heal, true);
     if (Blockly.highlightedConnection_) {
       Blockly.highlightedConnection_.unhighlight();
@@ -331,7 +331,7 @@ Blockly.longStop_ = function() {
  */
 Blockly.copy_ = function(block) {
   var xmlBlock = Blockly.Xml.blockToDom(block);
-  if (Blockly.dragMode_ != 2) {
+  if (Blockly.dragMode_ != Blockly.DRAG_FREE) {
     Blockly.Xml.deleteNext(xmlBlock);
   }
   // Encode start position in XML.
diff --git a/core/connection.js b/core/connection.js
index 0d98dbf45..70ce2ba05 100644
--- a/core/connection.js
+++ b/core/connection.js
@@ -567,7 +567,7 @@ Blockly.Connection.prototype.targetBlock = function() {
  * @private
  */
 Blockly.Connection.prototype.bumpAwayFrom_ = function(staticConnection) {
-  if (Blockly.dragMode_ != 0) {
+  if (Blockly.dragMode_ != Blockly.DRAG_NONE) {
     // Don't move blocks around while the user is doing the same.
     return;
   }
diff --git a/core/constants.js b/core/constants.js
index 5daa4f10c..9869a7f9b 100644
--- a/core/constants.js
+++ b/core/constants.js
@@ -28,16 +28,29 @@ goog.provide('Blockly.constants');
 
 
 /**
- * Required name space for SVG elements.
- * @const
+ * Number of pixels the mouse must move before a drag starts.
  */
-Blockly.SVG_NS = 'http://www.w3.org/2000/svg';
+Blockly.DRAG_RADIUS = 5;
 
 /**
- * Required name space for HTML elements.
- * @const
+ * Maximum misalignment between connections for them to snap together.
  */
-Blockly.HTML_NS = 'http://www.w3.org/1999/xhtml';
+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;
 
 /**
  * The richness of block colours, regardless of the hue.
@@ -60,6 +73,20 @@ Blockly.SPRITE = {
   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
@@ -95,17 +122,37 @@ Blockly.DUMMY_INPUT = 5;
  * @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 freely draggable.
+ * @const
+ */
+Blockly.DRAG_FREE = 2;
+
 /**
  * Lookup table for determining the opposite type of a connection.
  * @const
@@ -115,28 +162,3 @@ 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;
-
-/**
- * Number of pixels the mouse must move before a drag starts.
- */
-Blockly.DRAG_RADIUS = 5;
-
-/**
- * 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;
diff --git a/core/field.js b/core/field.js
index 06ff1cf88..6db2f0c97 100644
--- a/core/field.js
+++ b/core/field.js
@@ -422,7 +422,7 @@ Blockly.Field.prototype.onMouseUp_ = function(e) {
   } else if (Blockly.isRightButton(e)) {
     // Right-click.
     return;
-  } else if (Blockly.dragMode_ == 2) {
+  } else if (Blockly.dragMode_ == Blockly.DRAG_FREE) {
     // Drag operation is concluding.  Don't open the editor.
     return;
   } else if (this.sourceBlock_.isEditable()) {
diff --git a/core/flyout.js b/core/flyout.js
index e69a73c6f..39d579e86 100644
--- a/core/flyout.js
+++ b/core/flyout.js
@@ -677,6 +677,8 @@ Blockly.Flyout.prototype.createBlockFunc_ = function(originBlock) {
     }
     // Start a dragging operation on the new block.
     block.onMouseDown_(e);
+    Blockly.dragMode_ = Blockly.DRAG_FREE;
+    block.setDragging_(true);
   };
 };
 
diff --git a/core/icon.js b/core/icon.js
index d9d041dc7..5793a5b7a 100644
--- a/core/icon.js
+++ b/core/icon.js
@@ -128,7 +128,7 @@ Blockly.Icon.prototype.isVisible = function() {
  * @private
  */
 Blockly.Icon.prototype.iconClick_ = function(e) {
-  if (Blockly.dragMode_ == 2) {
+  if (Blockly.dragMode_ == Blockly.DRAG_FREE) {
     // Drag operation is concluding.  Don't open the editor.
     return;
   }
diff --git a/core/inject.js b/core/inject.js
index a4e471b7f..15010a4cb 100644
--- a/core/inject.js
+++ b/core/inject.js
@@ -345,7 +345,7 @@ Blockly.createMainWorkspace_ = function(svg, options) {
 
   if (!options.readOnly && !options.hasScrollbars) {
     var workspaceChanged = function() {
-      if (Blockly.dragMode_ == 0) {
+      if (Blockly.dragMode_ == Blockly.DRAG_NONE) {
         var metrics = mainWorkspace.getMetrics();
         var edgeLeft = metrics.viewLeft + metrics.absoluteLeft;
         var edgeTop = metrics.viewTop + metrics.absoluteTop;
diff --git a/core/mutator.js b/core/mutator.js
index e8cfac42c..095f957f5 100644
--- a/core/mutator.js
+++ b/core/mutator.js
@@ -267,7 +267,7 @@ Blockly.Mutator.prototype.setVisible = function(visible) {
  * @private
  */
 Blockly.Mutator.prototype.workspaceChanged_ = function() {
-  if (Blockly.dragMode_ == 0) {
+  if (Blockly.dragMode_ == Blockly.DRAG_NONE) {
     var blocks = this.workspace_.getTopBlocks(false);
     var MARGIN = 20;
     for (var b = 0, block; block = blocks[b]; b++) {
diff --git a/core/tooltip.js b/core/tooltip.js
index 4a8b83f32..6e520e65b 100644
--- a/core/tooltip.js
+++ b/core/tooltip.js
@@ -184,7 +184,7 @@ Blockly.Tooltip.onMouseMove_ = function(e) {
   if (!Blockly.Tooltip.element_ || !Blockly.Tooltip.element_.tooltip) {
     // No tooltip here to show.
     return;
-  } else if (Blockly.dragMode_ != 0) {
+  } else if (Blockly.dragMode_ != Blockly.DRAG_NONE) {
     // Don't display a tooltip during a drag.
     return;
   } else if (Blockly.WidgetDiv.isVisible()) {
diff --git a/core/workspace_svg.js b/core/workspace_svg.js
index bd1d031e1..7d42e6597 100644
--- a/core/workspace_svg.js
+++ b/core/workspace_svg.js
@@ -428,7 +428,7 @@ Blockly.WorkspaceSvg.prototype.traceOn = function(armed) {
  * @param {?string} id ID of block to find.
  */
 Blockly.WorkspaceSvg.prototype.highlightBlock = function(id) {
-  if (this.traceOn_ && Blockly.dragMode_ != 0) {
+  if (this.traceOn_ && Blockly.dragMode_ != Blockly.DRAG_NONE) {
     // The blocklySelectChange event normally prevents this, but sometimes
     // there is a race condition on fast-executing apps.
     this.traceOn(false);