From bde1edff85bafb25d95fab3cdc7239d67a60bcdf Mon Sep 17 00:00:00 2001
From: Navil Perez <navil@google.com>
Date: Thu, 17 Oct 2019 11:41:31 -0700
Subject: [PATCH 1/3] Add dragStart and dragEnd UI events

---
 core/block_dragger.js | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/core/block_dragger.js b/core/block_dragger.js
index eca2cfbec..2fb096c1d 100644
--- a/core/block_dragger.js
+++ b/core/block_dragger.js
@@ -26,6 +26,7 @@ goog.provide('Blockly.BlockDragger');
 goog.require('Blockly.blockAnimations');
 goog.require('Blockly.Events');
 goog.require('Blockly.Events.BlockMove');
+goog.require('Blockly.Events.Ui');
 goog.require('Blockly.InsertionMarkerManager');
 goog.require('Blockly.utils.Coordinate');
 goog.require('Blockly.utils.dom');
@@ -147,6 +148,7 @@ Blockly.BlockDragger.prototype.startBlockDrag = function(currentDragDeltaXY,
   if (!Blockly.Events.getGroup()) {
     Blockly.Events.setGroup(true);
   }
+  this.fireDragStartEvent_();
 
   // Mutators don't have the same type of z-ordering as the normal workspace
   // during a drag.  They have to rely on the order of the blocks in the SVG.
@@ -186,6 +188,16 @@ Blockly.BlockDragger.prototype.startBlockDrag = function(currentDragDeltaXY,
   }
 };
 
+/**
+ * Fire a ui event at the start of a block drag.
+ * @private
+ */
+Blockly.BlockDragger.prototype.fireDragStartEvent_ = function() {
+  var event = new Blockly.Events.Ui(this.draggingBlock_, 'dragStart',
+      null, this.draggingBlock_.getDescendants(false));
+  Blockly.Events.fire(event)
+};
+
 /**
  * Execute a step of block dragging, based on the given event.  Update the
  * display accordingly.
@@ -218,7 +230,8 @@ Blockly.BlockDragger.prototype.endBlockDrag = function(e, currentDragDeltaXY) {
   // Make sure internal state is fresh.
   this.dragBlock(e, currentDragDeltaXY);
   this.dragIconData_ = [];
-
+  this.fireDragEndEvent_();
+  
   Blockly.utils.dom.stopTextWidthCache();
 
   Blockly.blockAnimations.disconnectUiStop();
@@ -252,6 +265,16 @@ Blockly.BlockDragger.prototype.endBlockDrag = function(e, currentDragDeltaXY) {
   Blockly.Events.setGroup(false);
 };
 
+/**
+ * Fire a ui event at the end of a block drag.
+ * @private
+ */
+Blockly.BlockDragger.prototype.fireDragEndEvent_ = function() {
+  var event = new Blockly.Events.Ui(this.draggingBlock_, 'dragStop',
+      this.draggingBlock_.getDescendants(false), null);
+  Blockly.Events.fire(event);
+};
+
 /**
  * Fire a move event at the end of a block drag.
  * @private

From ce4163c7e4dfae39647499c1130743f9f9e443d1 Mon Sep 17 00:00:00 2001
From: Navil Perez <navil@google.com>
Date: Thu, 17 Oct 2019 15:13:26 -0700
Subject: [PATCH 2/3] Fix capitalization in the docstring.

---
 core/block_dragger.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/block_dragger.js b/core/block_dragger.js
index 2fb096c1d..6e6857506 100644
--- a/core/block_dragger.js
+++ b/core/block_dragger.js
@@ -189,7 +189,7 @@ Blockly.BlockDragger.prototype.startBlockDrag = function(currentDragDeltaXY,
 };
 
 /**
- * Fire a ui event at the start of a block drag.
+ * Fire a UI event at the start of a block drag.
  * @private
  */
 Blockly.BlockDragger.prototype.fireDragStartEvent_ = function() {
@@ -266,7 +266,7 @@ Blockly.BlockDragger.prototype.endBlockDrag = function(e, currentDragDeltaXY) {
 };
 
 /**
- * Fire a ui event at the end of a block drag.
+ * Fire a UI event at the end of a block drag.
  * @private
  */
 Blockly.BlockDragger.prototype.fireDragEndEvent_ = function() {

From c0784a61e7212bbbc394dcf14dc3b9f9a6aacb17 Mon Sep 17 00:00:00 2001
From: Navil Perez <navil@google.com>
Date: Thu, 17 Oct 2019 15:23:10 -0700
Subject: [PATCH 3/3] Linting Fix

---
 core/block_dragger.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/block_dragger.js b/core/block_dragger.js
index 6e6857506..9b6110f6b 100644
--- a/core/block_dragger.js
+++ b/core/block_dragger.js
@@ -195,7 +195,7 @@ Blockly.BlockDragger.prototype.startBlockDrag = function(currentDragDeltaXY,
 Blockly.BlockDragger.prototype.fireDragStartEvent_ = function() {
   var event = new Blockly.Events.Ui(this.draggingBlock_, 'dragStart',
       null, this.draggingBlock_.getDescendants(false));
-  Blockly.Events.fire(event)
+  Blockly.Events.fire(event);
 };
 
 /**