DataGrid Moving rows up and down

Question

I have this function to move rows up in a datagrid , yet i am having problems when it comes to move to rows down. I have tried changing the following line to +1 but it dint work any hints please.
            ac.addItemAt(itemToShift,dg.selectedIndex-1);
This is the code
public function up():void
            if(dg.selectedIndex == -1)
                Alert.show("Select the row which you want to up.");
                return;
            if(dg.selectedIndex == 0)return;
            var selectedRowInx : Number = dg.selectedIndex;
            var itemToShift : Object = ac.getItemAt(selectedRowInx) as Object;
            ac.addItemAt(itemToShift,dg.selectedIndex-1);
            ac.removeItemAt(dg.selectedIndex);
            dg.invalidateDisplayList();

Answer 1

Okay.  So, I made the code a little simpler than what I said. With my code, you could have selected a row, clicked a cut button, then selected a another row to past afterwards or whatever.  Here is the code for simply moving the row up and down.
I added code to catch if the row was at the top or the bottom of the data.  Also, I created two indexes, one for the grid and one for the array collection.  It will probably work with the one index, but I was trying to see if I could do the move on a sorted datagrid, but that is basically pointless.
protected function moveUpBtn_clickHandler(event:MouseEvent):void
var upSelectedIndex:int = myDataGrid.selectedIndex;
// Move Item
if(upSelectedIndex > -1) {
  if(upSelectedIndex > 0) {
   // Get the selected Object
   var moveObject:Object = myArrayCollection.getItemAt(upSelectedIndex);
   // Get actual Object location if grid is sorted
   var upActualIndex:int = myArrayCollection.getItemIndex(moveObject);
   // Remove selected item at actualIndex
   myArrayCollection.removeItemAt(upActualIndex);
   myArrayCollection.refresh();
   // Move both indexes
   upActualIndex--;
   upSelectedIndex--;
   // insert item at actualIndex
   myDataGrid.dataProvider.addItemAt(moveObject, upActualIndex);
   myArrayCollection.refresh();
   // select grid at selectedIndex
   myDataGrid.selectedIndex = upSelectedIndex;
  } else {
   Alert.show("Item is currently at the top of the list.", "Move Alert",  Alert.OK, this);
} else {
  Alert.show("No Item Selected.", "Move Alert",  Alert.OK, this);
protected function moveDownBtn_clickHandler(event:MouseEvent):void
var downSelectedIndex:int = myDataGrid.selectedIndex;
if(downSelectedIndex > -1) {
  // Move Item
  if(downSelectedIndex < myArrayCollection.length -1) {
   // Get the selected Object
   var moveObject:Object = myArrayCollection.getItemAt(downSelectedIndex);
   // Get actual Object location if grid is sorted
   var downActualIndex:int = myArrayCollection.getItemIndex(moveObject);
   // Remove selected item at actualIndex
   myArrayCollection.removeItemAt(downActualIndex);
   myArrayCollection.refresh();
   // Move both indexes
   downActualIndex++;
   downSelectedIndex++;
   // insert item at actualIndex
   myDataGrid.dataProvider.addItemAt(moveObject, downActualIndex);
   myArrayCollection.refresh();
   // select grid at selectedIndex
   myDataGrid.selectedIndex = downSelectedIndex;
  } else {
   Alert.show("Item is currently at the bottom of the list.", "Move Alert",  Alert.OK, this);
} else {
  Alert.show("No Item Selected.", "Move Alert",  Alert.OK, this);
Here is the blog post with the working DataGrid and Source View
Message was edited by: DeanLoganBH  - Had to set the Down Move to look for the Length of the ArrayCollection -1, because the DataGrid row starts at 0, it is one less than the total length of the ArrayCollection.