OCCT/src/SelectMgr/SelectMgr_SelectableObject.hxx

// Created on: 1995-02-20
// Created by: Mister rmi
// Copyright (c) 1995-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _SelectMgr_SelectableObject_HeaderFile
#define _SelectMgr_SelectableObject_HeaderFile

#include <PrsMgr_PresentableObject.hxx>
#include <SelectMgr_IndexedMapOfOwner.hxx>
#include <SelectMgr_SequenceOfSelection.hxx>
#include <SelectMgr_Selection.hxx>
#include <SelectMgr_SequenceOfOwner.hxx>

class SelectMgr_EntityOwner;
class Standard_NotImplemented;
class SelectMgr_SelectionManager;

//! A framework to supply the structure of the object to be selected.
//! At the first pick, this structure is created by calling the appropriate algorithm and retaining this framework for further picking.
//! This abstract framework is inherited in Application Interactive Services (AIS), notably in AIS_InteractiveObject.
//! Consequently, 3D selection should be handled by the relevant daughter classes and their member functions in AIS.
//! This is particularly true in the creation of new interactive objects.
//!
//! Key interface methods to be implemented by every Selectable Object:
//! * Presentable Object (PrsMgr_PresentableObject)
//!   Consider defining an enumeration of supported Display Mode indexes for particular Interactive Object or class of Interactive Objects.
//!   - AcceptDisplayMode() accepting display modes implemented by this object;
//!   - Compute() computing presentation for the given display mode index;
//! * Selectable Object (SelectMgr_SelectableObject)
//!   Consider defining an enumeration of supported Selection Mode indexes for particular Interactive Object or class of Interactive Objects.
//!   - ComputeSelection() computing selectable entities for the given selection mode index.
class SelectMgr_SelectableObject : public PrsMgr_PresentableObject
{
  DEFINE_STANDARD_RTTIEXT(SelectMgr_SelectableObject, PrsMgr_PresentableObject)
  friend class SelectMgr_SelectionManager;
public:

  //! Clears all selections of the object
  Standard_EXPORT virtual ~SelectMgr_SelectableObject();

  //! Computes sensitive primitives for the given selection mode - key interface method of Selectable Object.
  //! @param theSelection selection to fill
  //! @param theMode selection mode to create sensitive primitives
  virtual void ComputeSelection (const Handle(SelectMgr_Selection)& theSelection,
                                 const Standard_Integer theMode) = 0;

  //! Informs the graphic context that the interactive Object may be decomposed into sub-shapes for dynamic selection.
  //! The most used Interactive Object is AIS_Shape.
  virtual Standard_Boolean AcceptShapeDecomposition() const { return Standard_False; }

  //! Re-computes the sensitive primitives for all modes. IMPORTANT: Do not use
  //! this method to update selection primitives except implementing custom selection manager!
  //! This method does not take into account necessary BVH updates, but may invalidate the pointers
  //! it refers to. TO UPDATE SELECTION properly from outside classes, use method UpdateSelection.
  Standard_EXPORT void RecomputePrimitives();
  
  //! Re-computes the sensitive primitives which correspond to the <theMode>th selection mode.
  //! IMPORTANT: Do not use this method to update selection primitives except implementing custom selection manager!
  //! selection manager! This method does not take into account necessary BVH updates, but may invalidate
  //! the pointers it refers to. TO UPDATE SELECTION properly from outside classes, use method UpdateSelection.
  Standard_EXPORT void RecomputePrimitives (const Standard_Integer theMode);
  
  //! Adds the selection aSelection with the selection mode
  //! index aMode to this framework.
  Standard_EXPORT void AddSelection (const Handle(SelectMgr_Selection)& aSelection, const Standard_Integer aMode);
  
  //! Empties all the selections in the SelectableObject
  //! <update> parameter defines whether all object's
  //! selections should be flagged for further update or not.
  //! This improved method can be used to recompute an
  //! object's selection (without redisplaying the object
  //! completely) when some selection mode is activated not for the first time.
  Standard_EXPORT void ClearSelections (const Standard_Boolean update = Standard_False);
  
  //! Returns the selection having specified selection mode or NULL.
  Standard_EXPORT const Handle(SelectMgr_Selection)& Selection (const Standard_Integer theMode) const;

  //! Returns true if a selection corresponding to the selection mode theMode was computed for this object.
  Standard_Boolean HasSelection (const Standard_Integer theMode) const { return !Selection (theMode).IsNull(); }

  //! Return the sequence of selections.
  const SelectMgr_SequenceOfSelection& Selections() const { return myselections; }

  Standard_EXPORT void ResetTransformation() Standard_OVERRIDE;
  
  //! Recomputes the location of the selection aSelection.
  Standard_EXPORT virtual void UpdateTransformation() Standard_OVERRIDE;
  
  //! Updates locations in all sensitive entities from <aSelection>
  //! and in corresponding entity owners.
  Standard_EXPORT virtual void UpdateTransformations (const Handle(SelectMgr_Selection)& aSelection);
  
  //! Method which draws selected owners ( for fast presentation draw )
  Standard_EXPORT virtual void HilightSelected (const Handle(PrsMgr_PresentationManager)& thePrsMgr,
                                                const SelectMgr_SequenceOfOwner& theSeq);
  
  //! Method which clear all selected owners belonging
  //! to this selectable object ( for fast presentation draw )
  Standard_EXPORT virtual void ClearSelected();

  //! Method that needs to be implemented when the object
  //! manages selection and dynamic highlighting on its own.
  //! Clears or invalidates dynamic highlight presentation.
  //! By default it clears immediate draw of given presentation
  //! manager.
  Standard_EXPORT virtual void ClearDynamicHighlight (const Handle(PrsMgr_PresentationManager)& theMgr);

  //! Method which hilight an owner belonging to
  //! this selectable object  ( for fast presentation draw )
  Standard_EXPORT virtual void HilightOwnerWithColor (const Handle(PrsMgr_PresentationManager)& thePM,
                                                      const Handle(Prs3d_Drawer)& theStyle,
                                                      const Handle(SelectMgr_EntityOwner)& theOwner);
  
  //! If returns True, the old mechanism for highlighting selected objects is used (HilightSelected Method may be empty).
  //! If returns False, the HilightSelected method will be fully responsible for highlighting selected entity owners belonging to this selectable object.
  virtual Standard_Boolean IsAutoHilight() const { return myAutoHilight; }
  
  //! Set AutoHilight property to true or false.
  virtual void SetAutoHilight (const Standard_Boolean theAutoHilight) { myAutoHilight = theAutoHilight; }
  
  //! Creates or returns existing presentation for highlighting detected object.
  //! @param thePrsMgr presentation manager to create new presentation
  //! @return existing or newly created presentation (when thePrsMgr is not NULL)
  Standard_EXPORT Handle(Prs3d_Presentation) GetHilightPresentation (const Handle(PrsMgr_PresentationManager)& thePrsMgr);

  //! Creates or returns existing presentation for highlighting selected object.
  //! @param thePrsMgr presentation manager to create new presentation
  //! @return existing or newly created presentation (when thePrsMgr is not NULL)
  Standard_EXPORT Handle(Prs3d_Presentation) GetSelectPresentation (const Handle(PrsMgr_PresentationManager)& thePrsMgr);

  //! Removes presentations returned by GetHilightPresentation() and GetSelectPresentation().
  Standard_EXPORT virtual void ErasePresentations (Standard_Boolean theToRemove);

  //! Set Z layer ID and update all presentations of the selectable object.
  //! The layers mechanism allows drawing objects in higher layers in overlay of objects in lower layers.
  Standard_EXPORT virtual void SetZLayer (const Graphic3d_ZLayerId theLayerId) Standard_OVERRIDE;
  
  //! Sets update status FULL to selections of the object. Must be used as the only method of UpdateSelection
  //! from outer classes to prevent BVH structures from being outdated.
  void UpdateSelection (const Standard_Integer theMode = -1)
  {
    updateSelection (theMode);
  }

  //! Sets common entity owner for assembly sensitive object entities
  Standard_EXPORT void SetAssemblyOwner (const Handle(SelectMgr_EntityOwner)& theOwner, const Standard_Integer theMode = -1);

  //! Returns a bounding box of sensitive entities with the owners given if they are a part of activated selection
  Standard_EXPORT Bnd_Box BndBoxOfSelected (const Handle(SelectMgr_IndexedMapOfOwner)& theOwners);

  //! Returns the mode for selection of object as a whole; 0 by default.
  Standard_Integer GlobalSelectionMode() const { return myGlobalSelMode; }

  //! Returns the owner of mode for selection of object as a whole
  Standard_EXPORT virtual Handle(SelectMgr_EntityOwner) GlobalSelOwner() const;

  //! Returns common entity owner if the object is an assembly
  Standard_EXPORT virtual const Handle(SelectMgr_EntityOwner)& GetAssemblyOwner() const;

  //! Dumps the content of me into the stream
  Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const Standard_OVERRIDE;

protected:

  //! Protected empty constructor.
  Standard_EXPORT SelectMgr_SelectableObject(const PrsMgr_TypeOfPresentation3d aTypeOfPresentation3d = PrsMgr_TOP_AllView);

  //! Override global selection mode.
  void setGlobalSelMode (const Standard_Integer theMode)
  {
    myGlobalSelMode = theMode > 0 ? theMode : 0;
  }

  //! Update clipping planes state.
  Standard_EXPORT virtual void UpdateClipping() Standard_OVERRIDE;

  //! Sets update status FULL to selections of the object.
  //! Must be used as the only method of UpdateSelection from outer classes to prevent BVH structures from being outdated.
  Standard_EXPORT virtual void updateSelection (const Standard_Integer theMode);

protected:

  SelectMgr_SequenceOfSelection myselections;    //!< list of selections
  Handle(Prs3d_Presentation)    mySelectionPrs;  //!< optional presentation for highlighting selected object
  Handle(Prs3d_Presentation)    myHilightPrs;    //!< optional presentation for highlighting detected object
  Standard_Integer              myGlobalSelMode; //!< global selection mode
  Standard_Boolean              myAutoHilight;   //!< auto-highlighting flag defining

};

DEFINE_STANDARD_HANDLE(SelectMgr_SelectableObject, PrsMgr_PresentableObject)

#endif // _SelectMgr_SelectableObject_HeaderFile