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#ifndef __com_sun_star_document_XUndoManagerListener_idl__
#define __com_sun_star_document_XUndoManagerListener_idl__

#include <com/sun/star/document/UndoManagerEvent.idl>
#include <com/sun/star/lang/XEventListener.idl>

//==================================================================================================================

module com { module sun { module star { module document { 

//==================================================================================================================

/** implemented by components which want to be notified of changes in the Undo/Redo stacks of an Undo manager.

    @see XUndoManager
 */
interface XUndoManagerListener : ::com::sun::star::lang::XEventListener
{
    /** is called when an undo action is added to the undo stack.

        <p>Note that the action must not necessarily be the new top element of the stack: In case there's an
        open Undo context, <member>UndoManagerEvent::UndoContextDepth</member> will be greater <code>0</code>,
        and the newly added action will be subordinate of the context action.</p>

        @see XUndoManager::addUndoAction
    */
    void    undoActionAdded( [in] UndoManagerEvent i_event );

    /** is called when the top-most action of the undo stack has been undone.

        @see XUndoManager::undo
    */
    void    actionUndone( [in] UndoManagerEvent i_event );

    /** is called when the top-most action of the Redo stack has been re-applied.

        @see XUndoManager::redo
    */
    void    actionRedone( [in] UndoManagerEvent i_event );

    /** is called when both the Undo and the Redo stack have been cleared from all Undo actions.

        @see XUndoManager::clear
    */
    void    allActionsCleared( [in] ::com::sun::star::lang::EventObject i_event );

    /** is called when the the Redo stack has been cleared.

        @see XUndoManager::clearRedo
    */
    void    redoActionsCleared( [in] ::com::sun::star::lang::EventObject i_event );

    /** called when the complete undo manager has been reset
    */
    void    resetAll( [in] ::com::sun::star::lang::EventObject i_event );

    /** is called when a new Undo context has been entered.

        <p><member>UndoManagerEvent::UndoActionTitle</member> carries the title of the Undo context, and
        <member>UndoManagerEvent::UndoContextDepth</member> the number of open Undo contexts, including the
        one just entered.</p>

        @see XUndoManager::enterUndoContext
    */
    void    enteredContext( [in] UndoManagerEvent i_event );

    /** is called when a new hidden Undo context has been entered.

        <p><member>UndoManagerEvent::UndoActionTitle</member> carries the title of the Undo context, and
        <member>UndoManagerEvent::UndoContextDepth</member> the number of open Undo contexts, including the
        one just entered.</p>

        @see XUndoManager::enterUndoContext
    */
    void    enteredHiddenContext( [in] UndoManagerEvent i_event );

    /** is called when an Undo context has been left.

        <p><member>UndoManagerEvent::UndoActionTitle</member> carries the title of the Undo context, and
        <member>UndoManagerEvent::UndoContextDepth</member> the number of open Undo contexts, exluding the
        one just left.</p>

        @see XUndoManager::leaveUndoContext
        @see leftHiddenUndocontext
        @see cancelledContext
    */
    void    leftContext( [in] UndoManagerEvent i_event );

    /** is calledn when a hidden Undo context has been left.

        <p><member>UndoManagerEvent::UndoActionTitle</member> is empty, as hidden Undo contexts don't have
        a title.</p>

        @see XUndoManager::leaveHiddenUndoContext
        @see leftContext
        @see cancelledContext
    */
    void    leftHiddenContext( [in] UndoManagerEvent i_event );

    /** is called when an Undo context has been left, but no actions have been added within this context.

        <p>In such a case, the context which has just been left will not contribute to the undo stack, but instead
        be silently removed. Consequently, the <member>UndoManagerEvent::UndoActionTitle</member> is empty.</p>

        @see XUndoManager::leaveUndoContext
        @see leftContext
        @see leftHiddenContext
    */
    void    cancelledContext( [in] UndoManagerEvent i_event );
};

//==================================================================================================================

}; }; }; };

//==================================================================================================================

#endif
