public ScriptTreeLayer AddLayer(int layerNumber)
{
var layer = new ScriptTreeLayer(this, layerNumber);
if (Layers.Count == layerNumber)
Layers.Add(layer);
else
throw new Exception("Attempt to add layer " + layerNumber + " when layer count is " + Layers.Count);
return layer;
}
/// <summary>
/// Inserts empty layers below layerNumber in the tree to accomodate an upcoming merge
/// </summary>
public void ExtendBelowLayer(int layerNumber, int numberOfLayersToInsert)
{
// Example: 0, 1, 2, 3
// insert (a, b) below 1
// goal: 0, 1, 2, 3, 4, 5
// start at 2, add 2 and 3,
// increase old 2 and 3 to 4 and 5, meaning after insert start at 4th index
// These are Lists so this operation can be expensive
layerNumber++;
// Build the layer list
var newLayers = new ScriptTreeLayer[numberOfLayersToInsert];
for (int i = 0; i < numberOfLayersToInsert; i++)
newLayers[i] = new ScriptTreeLayer(this, layerNumber + i);
// Insert empty layers all at once to prevent repeated
Layers.InsertRange(layerNumber, newLayers);
// Fix layer numbers in the downstream
for (int i = layerNumber + numberOfLayersToInsert; i < Layers.Count; i++)
Layers[i].LayerNumber = i;
}