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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tango.Editors
{
/// <summary>
/// Represents an undo/redo state provider.
/// </summary>
public interface IUndoRedoStatesProvider
{
/// <summary>
/// Occurs when an Undo/Redo state was executed.
/// </summary>
event EventHandler<UndoRedoStateExecutedEventArgs> StateExecuted;
/// <summary>
/// Gets the undo states.
/// </summary>
Stack<IUndoRedoState> UndoStates { get; }
/// <summary>
/// Gets the redo states.
/// </summary>
Stack<IUndoRedoState> RedoStates { get; }
/// <summary>
/// Gets a value indicating whether this instance can undo.
/// </summary>
bool CanUndo { get; }
/// <summary>
/// Gets a value indicating whether this instance can redo.
/// </summary>
bool CanRedo { get; }
/// <summary>
/// Prepares the state of the undo.
/// </summary>
void PrepareUndoState();
/// <summary>
/// Creates the a new undo/redo state.
/// </summary>
/// <returns></returns>
IUndoRedoState CreateUndoRedoState();
/// <summary>
/// Executes the an undo/redo state.
/// </summary>
/// <param name="state">The state.</param>
void ExecuteState(IUndoRedoState state);
/// <summary>
/// Commits the state created by <see cref="PrepareUndoState"/>.
/// </summary>
void CommitUndoState();
/// <summary>
/// Performs an undo operation.
/// </summary>
void Undo();
/// <summary>
/// Performs a redo operation.
/// </summary>
void Redo();
/// <summary>
/// Resets undo and redo states.
/// </summary>
void Reset();
}
}
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