/// <summary>
/// <see cref="Unexecute"/>s the insert command (e.g. removes the graphic).
/// </summary>
public override void Unexecute()
{
if (_command is RemoveGraphicCommand)
{
_command.Execute();
_command = ((RemoveGraphicCommand)_command).GetUndoCommand();
}
}
/// <summary>
/// <see cref="Execute"/>s the insert command.
/// </summary>
public override void Execute()
{
if (_command is InsertGraphicCommand)
{
_command.Execute();
_command = ((InsertGraphicCommand)_command).GetUndoCommand();
}
}
/// <summary>
/// On first call, adds the graphic to the collection. Subsequent calls perform an insert.
/// </summary>
public override void Execute()
{
if (_command is AddGraphicCommand)
{
_command.Execute();
_command = ((AddGraphicCommand)_command).GetUndoCommand();
}
else if (_command is InsertGraphicCommand)
{
//after the initial add has executed (and has been undone) it's an insert from then on.
_command.Execute();
_command = ((InsertGraphicCommand)_command).GetUndoCommand();
}
}
/// <summary>
/// Constructor.
/// </summary>
public InsertGraphicUndoableCommand(IGraphic graphic, GraphicCollection parentCollection, int index)
{
_command = new InsertGraphicCommand(graphic, parentCollection, index);
}
/// <summary>
/// Constructor.
/// </summary>
public AddGraphicUndoableCommand(IGraphic graphic, GraphicCollection parentCollection)
{
_command = new AddGraphicCommand(graphic, parentCollection);
}
/// <summary>
/// Constructor.
/// </summary>
/// <remarks>
/// The <paramref name="graphic"/>'s <see cref="IGraphic.ParentGraphic"/> must not be null.
/// </remarks>
public RemoveGraphicUndoableCommand(IGraphic graphic)
{
_command = new RemoveGraphicCommand(graphic);
}