-- File:	SelectMgr_Selection.cdl
-- Created:	Mon Feb  6 17:43:28 1995
-- Author:	Mister rmi
--		<rmi@photon>
---Copyright:	 Matra Datavision 1995

class Selection from SelectMgr inherits TShared from MMgt

	---Purpose:  Represents the state of a given selection mode for a
    	-- Selectable Object. Contains all the sensitive entities available for this mode.
    	-- An interactive object can have an indefinite number of
    	-- modes of selection, each representing a
    	-- "decomposition" into sensitive primitives; each
    	-- primitive has an Owner (SelectMgr_EntityOwner)
    	-- which allows us to identify the exact entity which has
    	-- been detected. Each Selection mode is identified by
    	-- an index. The set of sensitive primitives which
    	-- correspond to a given mode is stocked in a
    	-- SelectMgr_Selection object. By Convention, the
    	-- default selection mode which allows us to grasp the
    	-- Interactive object in its entirety will be mode 0.
    	-- AIS_Trihedron : 4 selection modes
    	-- -   mode 0 : selection of a trihedron
    	-- -   mode 1 : selection of the origin of the trihedron
    	-- -   mode 2 : selection of the axes
    	-- -   mode 3 : selection of the planes XOY, YOZ, XOZ
    	-- when you activate one of modes 1 2 3 4 , you pick AIS objects of type:
    	-- -   AIS_Point
    	-- -   AIS_Axis (and information on the type of axis)
    	-- -   AIS_Plane (and information on the type of plane).
    	--   AIS_PlaneTrihedron offers 3 selection modes:
    	-- -   mode 0 : selection of the whole trihedron
    	-- -   mode 1 : selection of the origin of the trihedron
    	-- -   mode 2 : selection of the axes - same remarks as for the Trihedron.
    	-- AIS_Shape : 7 maximum selection modes, depending
    	-- on the complexity of the shape :
    	-- -   mode 0 : selection of the AIS_Shape
    	-- -   mode 1 : selection of the vertices
    	-- -   mode 2 : selection of the edges
    	-- -   mode 3 : selection of the wires
    	-- -   mode 4 : selection of the faces
    	-- -   mode 5 : selection of the shells
    	-- -   mode 6 :   selection of the constituent solids.

uses
    SensitiveEntity               from SelectBasics,
    ListOfSensitive               from SelectBasics,
    ListIteratorOfListOfSensitive from SelectBasics,
    TypeOfUpdate                  from SelectMgr

raises
    NullObject

is


    Create (IdMode  : Integer = 0) returns mutable Selection;
    	--- Purpose: Constructs a selection object defined by the selection mode IdMode.
    	-- The default setting 0 is the selection mode for a shape in its entirety.   

    Add  (me         : mutable;
    	  aprimitive : SensitiveEntity from SelectBasics) 
    	---Purpose: Adds the sensitive primitive aprimitive to the list of
    	-- stored entities in this object.
	-- Raises NullObject if the primitive is a null handle.
	raises NullObject
    	is static;

    Clear(me :mutable) is static;
    	---Purpose: empties the selection from all the stored entities 
    
    IsEmpty(me) returns Boolean is static;
    	---Purpose: returns true if no sensitive entity is stored.

    Mode (me) returns Integer;
    	---Purpose: returns the selection mode represented by this selection
    	---C++: inline


    ---Category: get the sensitive entities inside the Selection
    
    Init(me:mutable) is static;
    	---Purpose: Begins an iteration scanning for sensitive primitives.
	---C++: inline

    More(me) returns Boolean is static;
    	---Purpose: Continues the iteration scanning for sensitive
    	-- primitives with the mode defined in this framework.
    	---C++: inline


    Next(me:mutable) is static;
    	---Purpose: Returns the next sensitive primitive found in the
	-- iteration. This is a scan for entities with the mode
	-- defined in this framework.
    	---C++: inline
 
    Sensitive (me) returns any SensitiveEntity from SelectBasics is static;
    	---Purpose: Returns any sensitive primitive in this framework.
    	---C++: return const&
    	---C++: inline

    	---Category: Internal Methods for Management
    	--           
    	--           sets and gets the update status of a selection
    


    UpdateStatus(me) returns TypeOfUpdate from SelectMgr;    
    	---C++: inline
    	---Purpose: Returns the flag UpdateFlag.
    	-- This flage gives the update status of this framework
    	-- in a ViewerSelector object:
    	-- -   full
    	-- -   partial, or
    	-- -   none.
    

    UpdateStatus(me:mutable;UpdateFlag  : TypeOfUpdate from SelectMgr);
    	---C++: inline




fields

    myentities     : ListOfSensitive from SelectBasics;
    myit           : ListIteratorOfListOfSensitive from SelectBasics;
    myMode         : Integer from Standard;
    myUpdateStatus : TypeOfUpdate from SelectMgr;


end Selection;