feature(edit): add a trigger event to the beginEdit api and scope event.

This allows you to populate complex editors like ui-select with the keystroke that started the edit

Author: swalters

src/features/edit/js/gridEdit.js

@@ -88,8 +88,10 @@
                  * </pre>
                  * @param {object} rowEntity the options.data element that was edited
                  * @param {object} colDef the column that was edited
+                 * @param {object} triggerEvent the event that triggered the edit.  Useful to prevent losing keystrokes on some
+                 *                 complex editors
                  */
-                beginCellEdit: function (rowEntity, colDef) {
+                beginCellEdit: function (rowEntity, colDef, triggerEvent) {
                 },
                 /**
                  * @ngdoc event
@@ -568,7 +570,7 @@
 
             function beginEditKeyDown(evt) {
               if (uiGridEditService.isStartEditKey(evt)) {
-                beginEdit();
+                beginEdit(evt);
               }
             }
 
@@ -664,7 +666,7 @@
              *  </pre>
              *
              */
-            function beginEdit() {
+            function beginEdit(triggerEvent) {
               // If we are already editing, then just skip this so we don't try editing twice...
               if (inEdit) {
                 return;
@@ -760,8 +762,8 @@
                 deregOnEndCellEdit();
               });
 
-              $scope.$broadcast(uiGridEditConstants.events.BEGIN_CELL_EDIT);
-              $scope.grid.api.edit.raise.beginCellEdit($scope.row.entity, $scope.col.colDef);
+              $scope.$broadcast(uiGridEditConstants.events.BEGIN_CELL_EDIT, triggerEvent);
+              $scope.grid.api.edit.raise.beginCellEdit($scope.row.entity, $scope.col.colDef, triggerEvent);
             }
 
             function endEdit(retainFocus) {