-- File:    SelectMgr.cdl
-- Created: Mon Feb  6 14:08:38 1995
-- Author:  Mister rmi
--      <rmi@photon>
---Copyright:    Matra Datavision 1995



package SelectMgr 

    	---Purpose: SelectMgr manages the process of dynamic
    	-- selection through the following services:
    	-- -   activating and deactivating selection modes for Interactive Objects
    	-- -   adding and removing viewer selectors
    	-- -   definitions of abstract filter classes
    	--  The principle of graphic selection consists in
    	-- representing the objects which you want to select
    	-- by a bounding box in the selection view. The object
    	-- is selected when you use the mouse to designate
    	-- the zone produced by the object.
    	-- To realize this, the application creates a selection
    	-- structure which is independent of the point of view.
    	-- This structure is made up of sensitive primitives
    	-- which have one owner object associated to each of
    	-- them. The role of the sensitive primitive is to reply
    	-- to the requests of the selection algorithm whereas
    	-- the owner's purpose is to make the link between
    	-- the sensitive primitive and the object to be selected.
    	-- Each selection structure corresponds to a selection
    	-- mode which defines the elements that can be selected.
    	-- For example, to select a complete geometric model,
    	-- the application can create a sensitive primitive for
    	-- each face of the interactive object representing the
    	-- geometric model. In this case, all the primitives
    	-- share the same owner. On the other hand, to select
    	-- an edge in a model, the application must create
    	-- one sensitive primitive per edge.
    	-- Example
    	-- void
    	-- InteractiveBox::ComputeSelection
    	--       (const Handle(SelectMgr_Selection)& Sel,
    	--        const Standard_Integer Mode){ switch(Mode){ case 0:
    	-- // locating the whole box by making its faces sensitive ...
    	--          {
    	-- Handle(SelectMgr_EntityOwner)
    	--  Ownr = new
    	-- SelectMgr_EntityOwner(this,5);
    	--        for(Standard_Integer
    	-- I=1;I<=Nbfaces;I++){Sel->Add(new Select3D_SensitiveFace
    	--                (Ownr,[array of the vertices] face I);
    	--        break;
    	--        }
    	-- case 1:         // locates the   edges
    	--          {
    	--        for(Standard_Integer
    	--  i=1;i<=12;i++){
    	--                         // 1 owner per edge...
    	--          Handle(mypk_EdgeOwner)
    	--  Ownr = new
    	-- mypk_EdgeOwner(this,i,6);
    	--                         // 6->priority
    	--          Sel->Add(new
    	--          Select3D_SensitiveSegment
    	--                   (Ownr,firstpt(i),lastpt(i));
    	--        }
    	--        }
    	-- }
    	-- The algorithms for creating selection structures
    	-- store the sensitive primitives in a
    	-- SelectMgr_Selection object. To do this, a set of
    	-- ready-made sensitive primitives is supplied in the
    	-- Select2D and Select3D packages. New sensitive
    	-- primitives can be defined through inheritance
    	-- from   SensitiveEntity. For the application to make
    	-- its own objects selectable, it must define owner
    	-- classes inheriting SelectMgr_EntityOwner.
    	-- For any object inheriting from
    	-- AIS_InteractiveObject, you redefine its
    	-- ComputeSelection functions. In the example below
    	-- there are different modes of selection on the
    	-- topological shape contained within the interactive
    	-- object -selection of the shape itself, the vertices,
    	-- the edges, the wires, the faces.
    	-- Example
    	-- void
    	-- MyPack_MyClass::ComputeSelection(
    	--             const Handle(SelectMgr_Selection)& aSelection,
    	--             const Standard_Integer aMode)
    	-- {
    	--    switch(aMode){
    	--   case 0:
    	--   StdSelect_BRepSelectionTool::Load(
    	--      aSelection,this,myShape,TopAbs_SHAPE);
    	--   break;
    	--   }
    	--   case 1:
    	--   StdSelect_BRepSelectionTool::Load(
    	--      aSelection,this,myShape,TopAbs_VERTEX);
    	--   break;
    	--   }
    	--    case 2:
    	--    StdSelect_BRepSelectionTool::Load(
    	--       aSelection,this,myShape,TopAbs_EDGE);
    	--    break;
    	--    }
    	--    case 3:
    	--    StdSelect_BRepSelectionTool::Load(
    	--       aSelection,this,myShape,TopAbs_WIRE);
    	--    break;
    	--    }
    	--    case 4:
    	--    StdSelect_BRepSelectionTool::Load(
    	--       aSelection,this,myShape,TopAbs_FACE);
    	--    break;
    	--    }
    	-- }
    	-- The StdSelect_BRepSelectionTool object
    	-- provides a high level service which will make the
    	-- shape 'myShape' selectable when the
    	-- AIS_InteractiveContext is asked to display your object.
    	--   Note: The traditional way of highlighting selected entity
    	-- owners adopted by the Open CASCADE library assumes that
    	-- each entity owner highlights itself on its own. This approach
    	-- has two drawbacks: 
    	--      -      each entity owner has to maintain its own
    	--         Prs3d_Presentation object, that results in
    	--         large memory overhead for thousands of owners;
    	--      -      drawing selected owners one by one is not
    	--         efficient from the OpenGL usage viewpoint.
    	-- That is why a different method has been introduced. On the basis of
    	-- SelectMgr_EntityOwner::IsAutoHilight() return value an AIS_LocalContext
    	-- object either uses the traditional way of highlighting
    	-- (IsAutoHilight() returned true) or groups such owners according
    	-- to their Selectable Objects and finally calls
    	-- SelectMgr_SelectableObject::HilightSelected()
    	-- or ClearSelected(), passing a group of owners as an argument.
    	-- Hence, an application can derive its own interactive object and
    	-- redefine HilightSelected(), ClearSelected() and
    	-- HilightOwnerWithColor() virtual methods to take advantage of
    	-- such OpenGL technique as arrays of primitives. In any case,
    	-- these methods should at least have empty implementation.
    	-- The AIS_LocalContext::UpdateSelected(const Handle(AIS_InteratciveObject)&,
    	-- Standard_Boolean) method can be used for efficient redrawing a
    	-- selection presentation for a given interactive object from an
    	-- application code.
    	-- Additionally, the SelectMgr_SelectableObject::ClearSelections()
    	-- method now accepts an optional boolean argument. This parameter
    	-- defines whether all object selections should be flagged for
    	-- further update or not. This improved method can be used to
    	-- re-compute an object selection (without redisplaying the object
    	-- completely) when some selection mode is activated not for the first time.

uses
    Standard,
    MMgt,
    TCollection,
    TColStd, 
    TColgp,
    Quantity,
    Bnd,
    TopLoc,
    TopAbs,
    TopoDS,
    SelectBasics,
    PrsMgr,
    Prs3d,
    Graphic3d


is

    enumeration StateOfSelection is
        SOS_Activated,
        SOS_Deactivated,
        SOS_Sleeping,
        SOS_Any,
        SOS_Unknown;
    	---Purpose: different state of a Selection in a ViewerSelector...


    enumeration TypeOfUpdate is TOU_Full,TOU_Partial,TOU_None;
    	---Purpose: Provides values for types of update, including
    	-- -   full
    	-- -   partial
    	-- -   none.
    deferred class SelectableObject;

    deferred class ViewerSelector;
    	---Purpose: class selector dedicated to a view ;
    	--          contains all the sensitive Entities present 
    	--          in a view at selection time 


    deferred class Filter;

    deferred class CompositionFilter;     

    class AndFilter;
    	---Purpose: AND filter
    
    class OrFilter;
    	---Purpose: OR filter



    class EntityOwner;
    	---Purpose: Inherits EntityOwner from SelectBasics;
    	--          knows the selectable object it was made from;
    	--          


    class Selection;
    	---Purpose: set of primitives for a mode an an Object;
    	--          In fact a Selectable Object will have one or many
    	--          modes of selection or decomposition;
    	--          A Selection object will contain all the primitives
    	--          coming from one decomposition.



    class  SelectionManager;
    	---Purpose: manages all the Operations before selection -
    	--          i.e. add specific selections for an object in a selectionview




    ---Category: instantiations of classes from TCollection...

    class SequenceOfFilter instantiates Sequence from TCollection
    (Filter from SelectMgr);

    class ListOfFilter instantiates List from TCollection
    (Filter from SelectMgr);

    class SequenceOfOwner instantiates Sequence from TCollection
    (EntityOwner from SelectMgr);

    class IndexedMapOfOwner instantiates IndexedMap from TCollection
    (EntityOwner from SelectMgr,MapTransientHasher from TColStd);

    class DataMapOfIntegerSensitive instantiates DataMap from TCollection
        (Integer, SensitiveEntity from SelectBasics,
         MapIntegerHasher from TColStd);

    class SequenceOfSelector instantiates Sequence from TCollection
        (ViewerSelector);

    class SequenceOfSelection instantiates Sequence from TCollection
        (Selection);


    class DataMapOfSelectionActivation instantiates DataMap from TCollection
    (Selection,Integer,MapTransientHasher from TColStd);

    class DataMapOfObjectSelectors instantiates DataMap from TCollection
    (SelectableObject,SequenceOfSelector,MapTransientHasher from TColStd);

    private class IndexedDataMapOfOwnerCriterion
        instantiates IndexedDataMap from TCollection
                            (EntityOwner        from SelectBasics,
                             SortCriterion      from SelectMgr,
                             MapTransientHasher from TColStd);

    private class SortCriterion;

    pointer SOPtr to SelectableObject from SelectMgr;

    imported CompareResults;
        ---Purpose: Redefine CompareOfInteger from TCollection, to be used
        --          in method SortResult from class ViewerSelector

end SelectMgr;