chore(ios): include list state reference in “movestart” event (#13655)

Author: hansemannn

apidoc/Titanium/UI/ListView.yml

@@ -387,9 +387,22 @@ events:
  - name: movestart
 summary: Fired when a list row has started moving.
 description: |
- This property can be used to change the UI once a new drag-and-drop interaction starts.
+ This event can be used to change the UI once a new drag-and-drop interaction starts.
+ The event properties are available in Titanium SDK 12.0.0+ 
 since: "11.1.0"
 platforms: [android, iphone, ipad, macos]
+properties:
+ - name: section
+summary: List section from which the item is moved.
+type: Titanium.UI.ListSection
+
+ - name: sectionIndex
+summary: section index of the reference item.
+type: Number
+
+ - name: itemIndex
+summary: section item index of the reference item.
+type: Number
 
  - name: moveend
 summary: Fired when a list row has ended moving.

iphone/Classes/TiUIListView.m

@@ -1108,7 +1108,21 @@ - (BOOL)canMoveRowAtIndexPath:(NSIndexPath *)indexPath
  UIDragItem *dragItem = [[UIDragItem alloc] initWithItemProvider:itemProvider];
  dragItem.localObject = identifier;
 
- [[selfproxy] fireEvent:@"movestart"];
+// Fire an event to react to the move start
+NSIndexPath *realIndexPath = [selfpathForSearchPath:indexPath];
+ TiUIListSectionProxy *theSection = [[self.listViewProxy sectionForIndex:realIndexPath.section] retain];
+NSDictionary *theItem = [[theSection itemAtIndex:realIndexPath.row] retain];
+NSMutableDictionary *eventObject = [[NSMutableDictionaryalloc] initWithObjectsAndKeys:
+ theSection, @"section",
+NUMINTEGER(realIndexPath.section), @"sectionIndex",
+NUMINTEGER(realIndexPath.row), @"itemIndex",
+nil];
+
+ [[selfproxy] fireEvent:@"movestart"withObject:eventObject];
+
+ [eventObject release];
+ [theItem release];
+ [theSection release];
 
 return @[ dragItem ];
 }