//------------------------------------------------------------------------------
// UNDOREDO.IDL
//
// Interface definitions for undo/redo history management
//------------------------------------------------------------------------------

import "oaidl.idl";
import "ocidl.idl";

    ////////////////////////////////////////////////////////////////////////////
    // IAction interface
    //
    // Actions placed in the undo history of a text buffer expose this
    // interface.
    ////////////////////////////////////////////////////////////////////////////
	[
		object,
		uuid(D8C8AB11-7D4A-11d0-A8AA-00A0C921A4D2),
		helpstring("IAction Interface"),
		pointer_default(unique)
	]
	interface IAction : IUnknown
	{
		HRESULT     GetName(BSTR *bstrName, BOOL fLongName);
		HRESULT     GetSize(long *piSize);
        HRESULT     Undo (IUnknown *pObject);
        HRESULT     Redo (IUnknown *pObject);
        HRESULT     Abort (IUnknown *pObject);
        HRESULT     AddSibling (IAction *pAction);
        HRESULT     GetNextSibling (IAction **ppAction);
        HRESULT     AddChild (IAction *pAction);
        HRESULT     GetFirstChild (IAction **ppAction);
        HRESULT     CanMerge (IAction *pAction);
        HRESULT     Merge (IAction *pAction);
	};

    ////////////////////////////////////////////////////////////////////////////
    // IEnumActions interface
    //
    // Standard type enumerator interface for IActions in either an undo
    // or redo stack of a IActionHistory implementation
    ////////////////////////////////////////////////////////////////////////////
    [
        uuid(7A6335C8-7884-11d0-A8A9-00A0C921A4D2)
    ]
    interface IEnumActions : IUnknown
    {
        HRESULT     Next (ULONG celt, IAction **rgelt, ULONG *pceltFetched);
        HRESULT     Skip (ULONG celt);
        HRESULT     Reset ();
        HRESULT     Clone (IEnumActions **ppenum);
    };



    ////////////////////////////////////////////////////////////////////////////
    // IActionHistory interface
    //
    // Objects with undo/redo capability expose this interface.
    ////////////////////////////////////////////////////////////////////////////
	[
		object,
		uuid(8D5DE85B-7D42-11D0-A8AA-00A0C921A4D2),
		helpstring("IActionHistory Interface"),
		pointer_default(unique)
	]
	interface IActionHistory : IUnknown
	{
		HRESULT RecordAction([in]IAction *pAction);
		HRESULT OpenAction([in]IAction *pAction);
		HRESULT CloseAction();
		HRESULT AbortAction();
		HRESULT CanUndo();
		HRESULT CanRedo();
		HRESULT Undo();
		HRESULT Redo();
        HRESULT EnumUndoActions (IEnumActions **ppEnumUndoActions);
        HRESULT EnumRedoActions (IEnumActions **ppEnumRedoActions);
        HRESULT Reset ();
	};
	
	
	
[
	uuid(8D5DE84E-7D42-11D0-A8AA-00A0C921A4D2),
	version(1.0),
	helpstring("undoredo 1.0 Type Library")
]
library UNDOREDOLib
{
	importlib("stdole32.tlb");
	importlib("stdole2.tlb");

	[
		uuid(F5E7E71F-1401-11d1-883B-0000F87579D2),
		helpstring("ActionHistory Class")
	]
	coclass ActionHistory
	{
		[default] interface IActionHistory;
	};
};