public void SwapBlocks(int sourceIndex, int destinationIndex)
{
Block block = blocks[sourceIndex];
blocks.RemoveAt(sourceIndex);
blocks.Insert(destinationIndex, block);
// Context for moved block, source, source + 1, and destination + 1 blocks possibly changed so update viewmodels
BlockViewModel movedBlockViewModel = blockViewModelFactory.CreateBlockViewModel(block, blocks);
blockViewModels.RemoveAt(sourceIndex);
blockViewModels.Insert(destinationIndex, movedBlockViewModel);
BlockViewModel newBlockAtSource = blockViewModelFactory.CreateBlockViewModel(blocks[sourceIndex], blocks);
blockViewModels[sourceIndex] = newBlockAtSource;
if (sourceIndex + 1 < blocks.Count)
{
BlockViewModel afterSource = blockViewModelFactory.CreateBlockViewModel(blocks[sourceIndex + 1], blocks);
blockViewModels[sourceIndex + 1] = afterSource;
}
if (destinationIndex + 1 < blocks.Count)
{
BlockViewModel afterDestination = blockViewModelFactory.CreateBlockViewModel(blocks[destinationIndex + 1], blocks);
blockViewModels[destinationIndex + 1] = afterDestination;
}
programRepository.Update(blocks);
BlocksChanged?.Invoke(this, EventArgs.Empty);
}
void AddBlock(Block block)
{
blocks.Add(block);
blockViewModels.Add(blockViewModelFactory.CreateBlockViewModel(block, blocks));
programRepository.Update(blocks);
BlocksChanged?.Invoke(this, EventArgs.Empty);
}
void ReplaceBlock(Block oldBlock, Block newBlock)
{
int index = blocks.FindIndex(block => block == oldBlock);
if (index >= 0)
{
blocks[index] = newBlock;
blockViewModels[index] = blockViewModelFactory.CreateBlockViewModel(newBlock, blocks);
programRepository.Update(blocks);
BlocksChanged?.Invoke(this, EventArgs.Empty);
}
}
void RemoveBlock(Block block)
{
int index = blocks.FindIndex(b => b == block);
if (index >= 0)
{
blocks.RemoveAt(index);
blockViewModels.RemoveAt(index);
// Create new view model to set new context blocks
if (index < blocks.Count)
{
BlockViewModel newBlockViewModel = blockViewModelFactory.CreateBlockViewModel(blocks[index], blocks);
blockViewModels[index] = newBlockViewModel;
}
programRepository.Update(blocks);
BlocksChanged?.Invoke(this, EventArgs.Empty);
}
}