/// <summary>
/// Redo last undone action
/// </summary>
public void PerformRedo()
{
if (!Enabled || !CanRedo)
{
return;
}
var action = (IUndoAction)UndoOperationsStack.PopReverse();
action.Do();
OnRedo(action);
}
/// <summary>
/// Undo last recorded action
/// </summary>
public void PerformUndo()
{
if (!Enabled || !CanUndo)
{
return;
}
var action = (IUndoAction)UndoOperationsStack.PopHistory();
action.Undo();
OnUndo(action);
}
/// <summary>
/// Adds the action to the history.
/// </summary>
/// <param name="action">The action.</param>
public void AddAction(IUndoAction action)
{
if (action == null)
{
throw new ArgumentNullException();
}
if (!Enabled)
{
return;
}
UndoOperationsStack.Push(action);
OnAction(action);
}
/// <summary>
/// Ends recording for undo action.
/// </summary>
/// <param name="snapshotInstance">Instance of an object to finish recording, if null take last provided.</param>
public void RecordMultiEnd(object[] snapshotInstance = null)
{
if (!Enabled)
{
return;
}
if (snapshotInstance == null)
{
snapshotInstance = (object[])_snapshots.Last().Key;
}
var action = _snapshots[snapshotInstance].End(snapshotInstance);
_snapshots.Remove(snapshotInstance);
// It may be null if no changes has been found during recording
if (action != null)
{
UndoOperationsStack.Push(action);
OnAction(action);
}
}
/// <summary>
/// Ends recording for undo action.
/// </summary>
/// <param name="snapshotInstance">Instance of an object to finish recording, if null take last provided.</param>
/// <param name="customActionBefore">Custom action to append to the undo block action before recorded modifications apply.</param>
/// <param name="customActionAfter">Custom action to append to the undo block action after recorded modifications apply.</param>
public void RecordMultiEnd(object[] snapshotInstance = null, IUndoAction customActionBefore = null, IUndoAction customActionAfter = null)
{
if (!Enabled)
{
return;
}
if (snapshotInstance == null)
{
snapshotInstance = (object[])_snapshots.Last().Key;
}
var action = _snapshots[snapshotInstance].End(snapshotInstance);
_snapshots.Remove(snapshotInstance);
// It may be null if no changes has been found during recording
if (action != null)
{
// Batch with a custom action if provided
if (customActionBefore != null && customActionAfter != null)
{
action = new MultiUndoAction(new[] { customActionBefore, action, customActionAfter });
}
else if (customActionBefore != null)
{
action = new MultiUndoAction(new[] { customActionBefore, action });
}
else if (customActionAfter != null)
{
action = new MultiUndoAction(new[] { action, customActionAfter });
}
UndoOperationsStack.Push(action);
OnAction(action);
}
}
/// <summary>
/// Clears the history.
/// </summary>
public void Clear()
{
_snapshots.Clear();
UndoOperationsStack.Clear();
}
