/// <summary>
/// Merges two blocks at the given index.
/// </summary>
/// <param name="operation">Details of the operation performed.</param>
public virtual void MergeBlocks(IWriteableMergeBlocksOperation operation)
{
Debug.Assert(operation != null);
int MergeBlockIndex = operation.BlockIndex;
Debug.Assert(MergeBlockIndex > 0 && MergeBlockIndex < BlockStateList.Count);
IWriteableBlockState FirstBlockState = BlockStateList[MergeBlockIndex - 1];
IWriteableBlockState SecondBlockState = BlockStateList[MergeBlockIndex];
int MergeIndex = FirstBlockState.StateList.Count;
Debug.Assert(MergeIndex > 0);
NodeTreeHelperBlockList.MergeBlocks(Owner.Node, PropertyName, MergeBlockIndex, out IBlock mergedBlock);
Debug.Assert(FirstBlockState.ChildBlock == mergedBlock);
RemoveFromBlockStateList(MergeBlockIndex - 1);
operation.Update(FirstBlockState, MergeIndex);
int i;
for (i = 0; i < MergeIndex; i++)
{
IWriteablePlaceholderNodeState State = FirstBlockState.StateList[0];
IWriteableBrowsingExistingBlockNodeIndex ChildNodeIndex = State.ParentIndex as IWriteableBrowsingExistingBlockNodeIndex;
Debug.Assert(ChildNodeIndex != null);
FirstBlockState.Remove(ChildNodeIndex, 0);
SecondBlockState.Insert(ChildNodeIndex, i, State);
}
for (; i < SecondBlockState.StateList.Count; i++)
{
IWriteablePlaceholderNodeState State = SecondBlockState.StateList[i];
IWriteableBrowsingExistingBlockNodeIndex ChildNodeIndex = State.ParentIndex as IWriteableBrowsingExistingBlockNodeIndex;
Debug.Assert(ChildNodeIndex != null);
ChildNodeIndex.MoveBlockDown();
for (int j = 0; j < MergeIndex; j++)
{
ChildNodeIndex.MoveUp();
}
}
for (i = MergeBlockIndex; i < BlockStateList.Count; i++)
{
foreach (IWriteablePlaceholderNodeState State in BlockStateList[i].StateList)
{
IWriteableBrowsingExistingBlockNodeIndex ChildNodeIndex = State.ParentIndex as IWriteableBrowsingExistingBlockNodeIndex;
Debug.Assert(ChildNodeIndex != null);
ChildNodeIndex.MoveBlockDown();
}
}
}
/// <summary>
/// Handler called every time two blocks are merged.
/// </summary>
/// <param name="operation">Details of the operation performed.</param>
private protected virtual void OnBlocksMerged(IWriteableMergeBlocksOperation operation)
{
Debug.Assert(operation != null);
Debug.Assert(!operation.IsNested);
IWriteableBlockState BlockState = operation.BlockState;
Debug.Assert(BlockState != null);
Debug.Assert(!BlockStateViewTable.ContainsKey(BlockState));
}
