-- File:	DDataStd_Presentation.cdl
-- Created:	Wed Sep 23 08:15:56 1998
-- Author:	Denis PASCAL
--		<dp@dingox.paris1.matra-dtv.fr>
---Copyright:	 Matra Datavision 1998



class DrawPresentation from DDataStd inherits Attribute from TDF

	---Purpose: draw presentaion of a label of a document


uses GUID                from Standard,
     AttributeIndexedMap from TDF,
     DataSet             from TDF,
     AttributeDelta      from TDF,
     Label               from TDF,
     RelocationTable     from TDF,
     Drawable3D          from Draw

is


    ---Purpose: api methods on draw presentation
    --          ================================

    HasPresentation (myclass; L : Label from TDF)
    returns Boolean from Standard;
    
    IsDisplayed (myclass;  L : Label from TDF)
    returns Boolean from Standard;

    Display (myclass; L : Label from TDF);
    -- display <L> presentation in draw viewer.
    
    Erase (myclass; L : Label from TDF);
    -- erase <L> in draw viewer
    
    Update (myclass; L : Label from TDF);
    -- recompute and display L in draw viewer
    
    ---Purpose: attribute implementation
    --          ========================
    
    GetID(myclass) returns GUID from Standard;
    ---C++: return const &

    Create returns mutable DrawPresentation from DDataStd;

    SetDisplayed (me : mutable; status : Boolean from Standard);
    
    IsDisplayed (me)
    returns Boolean from Standard;    

    SetDrawable (me : mutable; D : Drawable3D from Draw);
    
    GetDrawable (me)
    returns Drawable3D from Draw;


    ID(me)returns GUID from Standard;
	---C++: return const &

    NewEmpty(me)
    returns mutable Attribute from TDF;    
 
    Restore(me: mutable; with : Attribute from TDF);

    Paste (me; into : mutable Attribute from TDF;
	       RT   : mutable RelocationTable from TDF);     


    ---Purpose: call backs for viewer updating
    --          ==============================

    AfterAddition (me: mutable)
    is redefined;    

    BeforeRemoval (me: mutable)
    is redefined;

    BeforeForget(me: mutable)
    is redefined;

    AfterResume(me: mutable)	
    is redefined;    
    
    BeforeUndo (me: mutable; anAttDelta : AttributeDelta from TDF;
                             forceIt    : Boolean from Standard = Standard_False)
    returns Boolean from Standard
    is redefined;
    
    AfterUndo (me: mutable; anAttDelta : AttributeDelta from TDF;
                            forceIt    : Boolean from Standard = Standard_False)
    ---Purpose: update draw viewer according to delta
    returns Boolean from Standard
    is redefined;


    ---Purpose: private methods
    --          ===============

    DrawBuild (me : mutable)
    is private;

    DrawDisplay (myclass; L : Label from TDF; P : DrawPresentation from DDataStd)
    is private;
    
    DrawErase (myclass; L : Label from TDF; P : DrawPresentation from DDataStd)
    is private;

fields

    isDisplayed : Boolean  from Standard;
    myDrawable  : Drawable3D from Draw;
    
end DrawPresentation;