Dragging changes, rebased on develop (#1078)

* Add block drag surface translateSurfaceBy

* Add dragged connection manager

* Add gesture.js

* Add GestureHandler

* Implemented gesture skeleton

* Most basic workspace dragging

* Add dragged connection manager

* cleanup

* doc

* more cleanup

* Add gesture handler

* Add translateSurfaceInternal

* core/block_dragger.js

* cleanup

* Pull in changes to dragged connection manager

* Pull in changes to dragged connection manager

* comments

* more annotations

* Add workspace dragger

* Add coordinate annotations

* Start on block dragging

* Limit number of concurrent gestures

* Add some TODOs

* start using dragged connection manager

* Set origin correctly for dragging blocks

* Connect or delete at the end of a block drag.

* cleanup

* handle field clicks and block + workspace right-clicks

* move code into BlockDragger class, but still reach into Gesture internals a lot

* Clean up block dragger

* Call blockDragger constructor with correct arguments

* Enable block dragging in a mutator workspace

* Add workspace dragger

* click todos

* Drag flyout with background

* more dragging from flyout

* nit

* fix dragging from flyouts

* Remove unused code and rename gestureHandler to gestureDB

* Rename gesture handler

* Added some jsdoc in gesture.js

* Update some docs

* Move some code to block_svg and clean up code

* Lots of coordinate annotations

* Fix block dragging when zoomed.

* Remove built files from branch

* More dragging work (#1026)

-- Drag bubbles while dragging blocks
-- Use bindEventWithChecks to work in touch on Android. Not tested anywhere else yet.
-- Handle dragging blocks while zoomed
-- Handle dragging blocks in mutators
-- Handle right-clicks (I hope)
-- Removed lots of unused code

* More dragging work (#1048)

- Removed gestureDB
- Removing uses of terminateDrag
- Cleaned up disposal code

* Dragging bugfixes (#1058)

- Get rid of flyout.dragMode_ and blockly.dragMode_
- Make drags from the flyout start from the top block in the group
- Block tooltips from being scheduled or shown during gestures
- Don't resize mutator bubbles mid-drag

* Fix events in new dragging (#1060)

* rebuild for testing

* unbuild

* Fix events

* rebuild

* Fix up cursors

* Use language files from develop

* Remove handled TODOS

* attempt to fix IE rerendering bug, and recalculate workspace positions on scroll

* Rebuild all the things

* Comment cleanup; annotations; delete unused variables.

core/blockly.js

@@ -73,20 +73,6 @@ Blockly.mainWorkspace = null;
  */
 Blockly.selected = null;
 
-/**
- * Currently highlighted connection (during a drag).
- * @type {Blockly.Connection}
- * @private
- */
-Blockly.highlightedConnection_ = null;
-
-/**
- * Connection on dragged block that matches the highlighted connection.
- * @type {Blockly.Connection}
- * @private
- */
-Blockly.localConnection_ = null;
-
 /**
  * All of the connections on blocks that are currently being dragged.
  * @type {!Array.<!Blockly.Connection>}
@@ -108,15 +94,6 @@ Blockly.clipboardXml_ = null;
  */
 Blockly.clipboardSource_ = null;
 
-/**
- * Is the mouse dragging a block?
- * DRAG_NONE - No drag operation.
- * DRAG_STICKY - Still inside the sticky DRAG_RADIUS.
- * DRAG_FREE - Freely draggable.
- * @private
- */
-Blockly.dragMode_ = Blockly.DRAG_NONE;
-
 /**
  * Cached value for whether 3D is supported.
  * @type {!boolean}
@@ -206,10 +183,18 @@ Blockly.onKeyDown_ = function(e) {
     // Do this first to prevent an error in the delete code from resulting in
     // data loss.
     e.preventDefault();
+    // Don't delete while dragging.  Jeez.
+    if (Blockly.mainWorkspace.isDragging()) {
+      return;
+    }
     if (Blockly.selected && Blockly.selected.isDeletable()) {
       deleteBlock = true;
     }
   } else if (e.altKey || e.ctrlKey || e.metaKey) {
+    // Don't use meta keys during drags.
+    if (Blockly.mainWorkspace.isDragging()) {
+      return;
+    }
     if (Blockly.selected &&
         Blockly.selected.isDeletable() && Blockly.selected.isMovable()) {
       if (e.keyCode == 67) {
@@ -239,25 +224,11 @@ Blockly.onKeyDown_ = function(e) {
     // Common code for delete and cut.
     Blockly.Events.setGroup(true);
     Blockly.hideChaff();
-    var heal = Blockly.dragMode_ != Blockly.DRAG_FREE;
-    Blockly.selected.dispose(heal, true);
-    if (Blockly.highlightedConnection_) {
-      Blockly.highlightedConnection_.unhighlight();
-      Blockly.highlightedConnection_ = null;
-    }
+    Blockly.selected.dispose(/* heal */ true, true);
     Blockly.Events.setGroup(false);
   }
 };
 
-/**
- * Stop binding to the global mouseup and mousemove events.
- * @private
- */
-Blockly.terminateDrag_ = function() {
-  Blockly.BlockSvg.terminateDrag();
-  Blockly.Flyout.terminateDrag_();
-};
-
 /**
  * Copy a block onto the local clipboard.
  * @param {!Blockly.Block} block Block to be copied.
@@ -265,9 +236,8 @@ Blockly.terminateDrag_ = function() {
  */
 Blockly.copy_ = function(block) {
   var xmlBlock = Blockly.Xml.blockToDom(block);
-  if (Blockly.dragMode_ != Blockly.DRAG_FREE) {
-    Blockly.Xml.deleteNext(xmlBlock);
-  }
+  // Copy only the selected block and internal blocks.
+  Blockly.Xml.deleteNext(xmlBlock);
   // Encode start position in XML.
   var xy = block.getRelativeToSurfaceXY();
   xmlBlock.setAttribute('x', block.RTL ? -xy.x : xy.x);