library: libTree #include "TBranchBrowsable.h"

# TCollectionPropertyBrowsable

class description - source file - inheritance tree (.pdf)

## class TCollectionPropertyBrowsable : public TVirtualBranchBrowsable

| Inheritance Chart:
`TObject`
| <- | `TNamed`
| <- | `TVirtualBranchBrowsable`
| <- | `TCollectionPropertyBrowsable` |

        protected:

                                       TCollectionPropertyBrowsable(const char* name, const char* title, const char* draw, const TBranch* branch, const TVirtualBranchBrowsable* parent = 0)

        public:

                                       TCollectionPropertyBrowsable(const TCollectionPropertyBrowsable&)
                                       ~TCollectionPropertyBrowsable()
                          virtual void Browse(TBrowser* b)
                        static TClass* Class()
                          static Int_t GetBrowsables(TList& list, const TBranch* branch, const TVirtualBranchBrowsable* parent = 0)
                           const char* GetDraw() const
                       virtual TClass* IsA() const
                           static void Register()
                          virtual void ShowMembers(TMemberInspector& insp, char* parent)
                          virtual void Streamer(TBuffer& b)
                                  void StreamerNVirtual(TBuffer& b)
                           static void Unregister()

### Data Members

        private:

          TString fDraw  string to send to TTree::Draw(), NOT by GetScope()!

## Class Description

     TVirtualBranchBrowsable is a base class (not really abstract, but useless
     by itself) for helper objects that extend TBranch's browsing support.
     Each registered derived class's generator method is called, which fills
     all created helper objects into a list which can then be browsed.
     For details of what these browser helper objects can do, see e.g.
     TMethodBrowsable, which allows methods to show up in the TBrowser.

     Only registered helper objects are created. By default, only
     TMethodBrowsable, TNonSplitBrowsable, and TCollectionPropertyBrowsable
     are registered (see RegisterDefaultGenerators). You can prevent any of
     their objects to show up in the browser by unregistering the generator:
       TMethodBrowsable::Unregister()
     will stop creating browsable method helper objects from that call on.
     Note that these helper objects are cached (in TBranch::fBrowsables);
     already created (and thus cached) browsables will still appear in the
     browser even after unregistering the corresponding generator.

     You can implement your own browsable objects and thier generator; see
     e.g. the simple TCollectionPropertyBrowsable. Note that you will have
     to register your generator just like any other, and that you should
     implement the following methods for your own class, mainly for
     consistency reasons:
       static void Register() {
         TVirtualBranchBrowsable::RegisterGenerator(GetBrowsables); }
       static void Unregister() {
         TVirtualBranchBrowsable::UnregisterGenerator(GetBrowsables); }
     where GetBrowsables is a static member function of your class, that
     creates the browsable helper objects, and has the signature
       static Int_t GetBrowsables(TList& list, const TBranch* branch,
                                  const TVirtualBranchBrowsable* parent=0);
     It has to return the number of browsable helper objects for parent
     (or, if NULL, for branch) which are added to the list.
    ______________________________________________________________________________

void Browse(TBrowser *b)

     Browses a TCollectionPropertyBrowsable. The only difference to
     the generic TVirtualBranchBrowsable::Browse is our fDraw

Int_t GetBrowsables(TList& li, const TBranch* branch, const TVirtualBranchBrowsable* parent /* =0 */)

     If the element to browse (given by either parent of branch) contains
     a collection (TClonesArray or something for which a TVirtualCollectionProxy
     exists), we will add some special objects to the browser. For now there is
     just one object "@size", returning the size of the collection (as in
     std::list::size(), or TClonesArray::GetEntries()).
     The objects we create are simply used to forward strings (like "@size") to
     TTreeFormula via our Browse method. These strings are stored in fName.

void Register()

     Wrapper for the registration method. Needed against MSVC, which
     assigned different addr to the same method, depending on what
     translation unit you're in...

void Unregister()

     Wrapper for the registration method. Needed against MSVC, which
     assigned different addr to the same method, depending on what
     translation unit you're in...

### Inline Functions

                                    void ~TCollectionPropertyBrowsable()
                             const char* GetDraw() const
            TCollectionPropertyBrowsable TCollectionPropertyBrowsable(const char* name, const char* title, const char* draw, const TBranch* branch, const TVirtualBranchBrowsable* parent = 0)
                                 TClass* Class()
                                 TClass* IsA() const
                                    void ShowMembers(TMemberInspector& insp, char* parent)
                                    void Streamer(TBuffer& b)
                                    void StreamerNVirtual(TBuffer& b)
            TCollectionPropertyBrowsable TCollectionPropertyBrowsable(const TCollectionPropertyBrowsable&)

Author: Axel Naumann 14/10/2004
Last update: root/tree:$Name: $:$Id: TBranchBrowsable.cxx,v 1.5 2005/05/18 21:04:54 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *