/// <summary>
/// Moves a node around in a list or block list. In a block list, the node stays in same block.
/// </summary>
/// <param name="operation">Details of the operation performed.</param>
public virtual void Move(IWriteableMoveNodeOperation operation)
{
Debug.Assert(operation != null);
int BlockIndex = operation.BlockIndex;
Debug.Assert(BlockIndex >= 0 && BlockIndex < BlockStateList.Count);
IWriteableBlockState BlockState = BlockStateList[BlockIndex];
IWriteablePlaceholderNodeStateReadOnlyList StateList = BlockState.StateList;
int MoveIndex = operation.Index;
int Direction = operation.Direction;
Debug.Assert(MoveIndex >= 0 && MoveIndex < StateList.Count);
Debug.Assert(MoveIndex + Direction >= 0 && MoveIndex + Direction < StateList.Count);
IWriteableBrowsingExistingBlockNodeIndex ExistingBlockNodeIndex = StateList[MoveIndex].ParentIndex as IWriteableBrowsingExistingBlockNodeIndex;
Debug.Assert(ExistingBlockNodeIndex != null);
BlockState.Move(ExistingBlockNodeIndex, MoveIndex, Direction);
IBlock ChildBlock = BlockState.ChildBlock;
NodeTreeHelperBlockList.MoveNode(ChildBlock, MoveIndex, Direction);
operation.Update(StateList[MoveIndex + Direction]);
if (Direction > 0)
{
for (int i = MoveIndex; i < MoveIndex + Direction; i++)
{
IWriteableBrowsingExistingBlockNodeIndex ChildNodeIndex = StateList[i].ParentIndex as IWriteableBrowsingExistingBlockNodeIndex;
Debug.Assert(ChildNodeIndex != null);
ChildNodeIndex.MoveDown();
ExistingBlockNodeIndex.MoveUp();
}
}
else if (Direction < 0)
{
for (int i = MoveIndex; i > MoveIndex + Direction; i--)
{
IWriteableBrowsingExistingBlockNodeIndex ChildNodeIndex = StateList[i].ParentIndex as IWriteableBrowsingExistingBlockNodeIndex;
Debug.Assert(ChildNodeIndex != null);
ChildNodeIndex.MoveUp();
ExistingBlockNodeIndex.MoveDown();
}
}
}
