public void AddLine(Line newLine, GeneratorDirection fillDirection)
{
if (fillDirection == GeneratorDirection.Forward)
{
_lines.AddToBack(newLine);
}
else
{
_lines.AddToFront(newLine);
Start -= newLine.Extent;
}
}
public void AddLine(Line newLine, GeneratorDirection fillDirection)
{
Debug.Assert(_lines.None(l => l.FirstItem == newLine.FirstItem), "Duplicate line detected");
if (fillDirection == GeneratorDirection.Forward)
{
_lines.AddToBack(newLine);
}
else
{
_lines.AddToFront(newLine);
Start -= newLine.Extent;
}
}
/// <summary>
/// Prefetch views in the target range that aren't yet in the buffer.
/// </summary>
private void PrefetchViews(RecyclerView.Recycler recycler, RecyclerView.State state)
{
if (Layout.ItemCount == 0 || CacheHalfLength == 0)
{
return;
}
PrefetchTrailing();
PrefetchLeading();
if (!_isInitiallyPopulated
// The leading buffer may be empty if the previous prefetch ended early, eg because it found an unrecyclable item
&& LeadingBufferEnd > -1)
{
PrefetchExtra();
_isInitiallyPopulated = true;
}
CheckValidSteadyState();
void PrefetchTrailing()
{
if (TrailingBufferTargetSize == 0)
{
return;
}
// Seed buffer; otherwise succeeding logic fails
if (_trailingBuffer.Count == 0)
{
if (PrefetchView(recycler, state, TrailingBufferTargetStart) is { } record)
{
_trailingBuffer.AddToBack(record);
}
else
{
// List is animating, etc, so forgo populating the buffer at this time
return;
}
CheckValidState();
}
while (TrailingBufferStart > TrailingBufferTargetStart)
{
if (PrefetchView(recycler, state, TrailingBufferStart - 1) is { } record)
{
_trailingBuffer.AddToFront(record);
}
