//--------------------//
#region Undo
/// <inheritdoc/>
protected override void OnUndo()
{
// Remove last command from the undo list, execute it and add it to the redo list
IUndoCommand lastCommand = UndoBackups.Pop();
lastCommand.Undo();
RedoBackups.Push(lastCommand);
}
/// <summary>
/// Mark the content of this tab as changed (needs to be saved) and create a new undo-backup
/// </summary>
protected override void OnChange()
{
// Move the last backup to the undo list and then create a new backup
UndoBackups.Push(_currentBackup);
_currentBackup = (ICloneable)Content.Clone();
buttonUndo.Enabled = true;
base.OnChange();
}
/// <summary>
/// Called to redo the last undone change
/// </summary>
protected override void OnRedo()
{
// Remove the last backup from the redo list, then add the current backup to the undo list
ICloneable toRestore = RedoBackups.Pop();
UndoBackups.Push(_currentBackup);
// Restore the backup and update the current backup
Content = (ICloneable)toRestore.Clone();
_currentBackup = (ICloneable)Content.Clone();
}
//--------------------//
#region Command
/// <summary>
/// Executes a <see cref="IUndoCommand"/> using this tab's undo stack.
/// </summary>
protected void ExecuteCommand(IUndoCommand command)
{
#region Sanity checks
if (command == null)
{
throw new ArgumentNullException(nameof(command));
}
#endregion
command.Execute();
UndoBackups.Push(command);
buttonUndo.Enabled = true;
OnUpdate();
OnChange();
}