// Toggles an item's completion state and moves the item to the appropriate index. The normalized from/to indexes are returned in the AAPLListOperationInfo struct.
public ListOperationInfo ToggleItem(ListItem item, int preferredDestinationIndex)
{
int fromIndex = items.IndexOf(item);
if (fromIndex == -1)
{
throw new InvalidProgramException("Toggling an item that isn't in the list is undefined.");
}
items.RemoveAt(fromIndex);
item.IsComplete = !item.IsComplete;
int toIndex = preferredDestinationIndex;
if (toIndex == -1)
{
toIndex = item.IsComplete ? Count : IndexOfFirstCompletedItem();
}
items.Insert(toIndex, item);
var toggleInfo = new ListOperationInfo {
FromIndex = fromIndex,
ToIndex = toIndex
};
return(toggleInfo);
}
public ListOperationInfo MoveItem(ListItem item, int toIndex)
{
int fromIndex = items.IndexOf(item);
if (fromIndex == -1)
{
throw new InvalidProgramException("Moving an item that isn't in the list is undefined.");
}
items.RemoveAt(fromIndex);
int normalizedToIndex = toIndex;
if (fromIndex < toIndex)
{
normalizedToIndex--;
}
items.Insert(normalizedToIndex, item);
var moveInfo = new ListOperationInfo {
FromIndex = fromIndex,
ToIndex = normalizedToIndex
};
return(moveInfo);
}
// Toggles an item's completion state and moves the item to the appropriate index. The normalized from/to indexes are returned in the ListOperationInfo struct.
public ListOperationInfo ToggleItem(ListItem item, int preferredDestinationIndex)
{
int fromIndex = items.IndexOf (item);
if (fromIndex == -1)
throw new InvalidProgramException ("Toggling an item that isn't in the list is undefined.");
items.RemoveAt (fromIndex);
item.IsComplete = !item.IsComplete;
int toIndex = preferredDestinationIndex;
if (toIndex == -1)
toIndex = item.IsComplete ? Count : IndexOfFirstCompletedItem();
items.Insert (toIndex, item);
var toggleInfo = new ListOperationInfo {
FromIndex = fromIndex,
ToIndex = toIndex
};
return toggleInfo;
}
public ListOperationInfo MoveItem(ListItem item, int toIndex)
{
int fromIndex = items.IndexOf (item);
if (fromIndex == -1)
throw new InvalidProgramException ("Moving an item that isn't in the list is undefined.");
items.RemoveAt (fromIndex);
int normalizedToIndex = toIndex;
if (fromIndex < toIndex)
normalizedToIndex--;
items.Insert (normalizedToIndex, item);
var moveInfo = new ListOperationInfo {
FromIndex = fromIndex,
ToIndex = normalizedToIndex
};
return moveInfo;
}
