/// <summary>
/// Clears all snapshot records.
/// </summary>
public static void ClearSnapshots()
{
lock (SnapshotManager.AccessLock)
{
SnapshotManager.Snapshots.Clear();
SnapshotManager.DeletedSnapshots.Clear();
SnapshotManager.NotifyObservers();
// There can be multiple GB of deleted snapshots, so run the garbage collector ASAP for a performance boost.
Task.Run(() => GC.Collect());
}
}
/// <summary>
/// Reverses an undo action.
/// </summary>
public static void RedoSnapshot()
{
lock (SnapshotManager.AccessLock)
{
if (SnapshotManager.DeletedSnapshots.Count == 0)
{
return;
}
SnapshotManager.Snapshots.Push(SnapshotManager.DeletedSnapshots.Pop());
SnapshotManager.NotifyObservers();
}
}
/// <summary>
/// Saves a new snapshot, which will become the current active snapshot.
/// </summary>
/// <param name="snapshot">The snapshot to save.</param>
public static void SaveSnapshot(Snapshot snapshot)
{
lock (SnapshotManager.AccessLock)
{
// Remove null snapshot if exists
if (SnapshotManager.Snapshots.Count != 0 && SnapshotManager.Snapshots.Peek() == null)
{
SnapshotManager.Snapshots.Pop();
}
// Do not keep large snapshots in the undo history
if (SnapshotManager.Snapshots.Count != 0 && SnapshotManager.Snapshots.Peek() != null && SnapshotManager.Snapshots.Peek().ByteCount > SnapshotManager.SizeLimit)
{
SnapshotManager.Snapshots.Pop();
}
SnapshotManager.Snapshots.Push(snapshot);
SnapshotManager.DeletedSnapshots.Clear();
SnapshotManager.NotifyObservers();
}
}
