private void SplitBlock(int blockId, int position)
{
var block = blocks[blockId];
var newBlock = new CharBlock
{
Id = blockId + 1,
BlockPosition = block.BlockPosition + position,
VisibleElements = block.VisibleElements.Where(t => t.Position >= position).ToArray(),
Elements = block.Elements.Skip(position).ToArray(),
};
block.Elements = block.Elements.Take(position).ToArray();
block.VisibleElements = block.VisibleElements.Where(t => t.Position < position).ToArray();
blocks.Insert(blockId + 1, newBlock);
for (var i = blockId + 2; i < blocks.Count; i++)
{
blocks[i].Id++;
}
position = 0;
foreach (var element in newBlock.Elements)
{
element.Block = newBlock;
element.Position = position++;
}
newBlock.BlockVisiblePosition = block.BlockVisiblePosition + block.VisibleElements.Length;
position = 0;
foreach (var element in newBlock.VisibleElements)
{
element.VisiblePosition = position++;
}
}
public void Delete(Char[] toDeleteChars)
{
Length -= toDeleteChars.Length;
var shift = toDeleteChars.Length;
var lastBlock = blocks.Count - 1;
int lastPosition = blocks.Last().VisibleElements.Length;
CharBlock prevBlock = null;
for (var j = toDeleteChars.Length - 1; j >= 0; j--)
{
var ci = idToChar[toDeleteChars[j].Id];
var cb = ci.Block;
if (lastBlock >= cb.Id + 1)
{
for (var i = cb.Id + 1; i <= lastBlock; i++)
{
blocks[i].BlockVisiblePosition -= shift;
}
lastPosition = cb.Elements.Length;
}
for (var i = ci.VisiblePosition + 1; i < lastPosition; i++)
{
cb.VisibleElements[i].VisiblePosition -= shift;
}
if (cb != prevBlock && prevBlock != null)
{
prevBlock.VisibleElements = prevBlock.VisibleElements.Where(t => t.VisiblePosition >= 0).ToArray();
}
prevBlock = cb;
shift--;
lastBlock = cb.Id;
lastPosition = ci.VisiblePosition;
ci.VisiblePosition = -1;
}
if (prevBlock != null)
{
prevBlock.VisibleElements = prevBlock.VisibleElements.Where(t => t.VisiblePosition >= 0).ToArray();
}
}