-- File:	IGESSelect_ChangeLevelList.cdl
-- Created:	Thu Aug 25 15:44:24 1994
-- Author:	Christian CAILLET
--		<cky@anion>
---Copyright:	 Matra Datavision 1994


class  ChangeLevelList  from IGESSelect  inherits ModelModifier from IGESSelect

    ---Purpose : Changes Level List (in directory part) to a new single value
    --           Only entities attached to a LevelListEntity are considered
    --           If OldNumber is defined, only entities whose LevelList
    --           contains its Value are processed. Else all LevelLists are.
    --           
    --           Remark : this concerns the Directory Part only. The Level List
    --           Entities themselves (their content) are not affected.
    --           
    --           If NewNumber is defined (positive or zero), it gives the new
    --           value for Level Number. Else, the first value of the LevelList
    --           is set as new LevelNumber

uses AsciiString from TCollection,
     IGESModel, CopyTool, ContextModif, IntParam

is

    Create returns mutable ChangeLevelList;
    ---Purpose : Creates a ChangeLevelList, not yet defined
    --           (see SetOldNumber and SetNewNumber)

    HasOldNumber (me) returns Boolean;
    ---Purpose : Returns True if OldNumber is defined : then, only entities
    --           which have a LevelList which contains the value are processed.
    --           Else, all entities attached to a LevelList are.

    OldNumber (me) returns mutable IntParam;
    ---Purpose : Returns the parameter for OldNumber. If not defined (Null
    --           Handle), it will be interpreted as "all level lists"

    SetOldNumber (me : mutable; param : mutable IntParam);
    ---Purpose : Sets a parameter for OldNumber

    HasNewNumber (me) returns Boolean;
    ---Purpose : Returns True if NewNumber is defined : then, it gives the new
    --           value for Level Number. Else, the first value of the LevelList
    --           is used as new Level Number.

    NewNumber (me) returns mutable IntParam;
    ---Purpose : Returns the parameter for NewNumber. If not defined (Null
    --           Handle), it will be interpreted as "new value 0"

    SetNewNumber (me : mutable; param : mutable IntParam);
    ---Purpose : Sets a parameter for NewNumber


    Performing (me; ctx : in out ContextModif;
    	        target  : mutable IGESModel;
                TC      : in out CopyTool);
    ---Purpose : Specific action : considers selected target entities :
    --           If OldNumber is not defined, all entities attached to a
    --             Level List
    --           If OldNumber is defined (value not negative), entities with a
    --             Level List which contains this value
    --           Attaches all these entities to value given by NewNumber, or
    --             the first value of the Level List

    Label (me) returns AsciiString from TCollection;
    ---Purpose : Returns a text which begins by
    --           "Changes Level Lists containing <old>", or
    --           "Changes all Level Lists in D.E.", and ends by
    --           " to Number <new>"  or  " to Number = first value in List"

fields

    theold : IntParam;
    thenew : IntParam;

end ChangeLevelList;