library: libGui
#include "TGGC.h"

TGGCPool

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

class TGGCPool : public TGObject

Inheritance Chart:

TObject

TGObject

TGGCPool

    private:

       void ForceFreeGC(const TGGC* gc)
      Int_t MatchGC(const TGGC* gc, GCValues_t* values)
       void UpdateGC(TGGC* gc, GCValues_t* values)

    protected:

                TGGCPool(const TGGCPool& gp)
      TGGCPool& operator=(const TGGCPool& gp)

    public:

                      TGGCPool(TGClient* client)
              virtual ~TGGCPool()
       static TClass* Class()
                TGGC* FindGC(const TGGC* gc)
                TGGC* FindGC(GContext_t gc)
                 void FreeGC(const TGGC* gc)
                 void FreeGC(GContext_t gc)
                TGGC* GetGC(GCValues_t* values, Bool_t rw = kFALSE)
                TGGC* GetGC(GContext_t gct)
      virtual TClass* IsA() const
         virtual void Print(Option_t* option = "") const
         virtual void ShowMembers(TMemberInspector& insp, char* parent)
         virtual void Streamer(TBuffer& b)
                 void StreamerNVirtual(TBuffer& b)

Data Members

    private:

      THashTable* fList  hash table of graphics contexts in pool

Class Description

                                                                      
 TGGC and TGGCPool                                                    
                                                                      
 Encapsulate a graphics context used in the low level graphics.       
 TGGCPool provides a pool of graphics contexts.

TGGCPool(TGClient *client)

 Create graphics context pool.

~TGGCPool()

 Delete graphics context pool.

void ForceFreeGC(const TGGC *gct)

 Force remove graphics context from list. Is only called via ~TGGC().

void FreeGC(const TGGC *gct)

 Delete graphics context if it is not used anymore.

void FreeGC(GContext_t gct)

 Delete graphics context if it is not used anymore.

TGGC * FindGC(const TGGC *gct)

 Find graphics context. Returns 0 in case gc is not found.

TGGC * FindGC(GContext_t gct)

 Find graphics context based on its GContext_t handle. Returns 0
 in case gc is not found.

TGGC * GetGC(GContext_t gct)

 returns graphics context based on its GContext_t handle.

TGGC * GetGC(GCValues_t *values, Bool_t rw)

 Get the best matching graphics context depending on values.
 If rw is false only a readonly, not modifiable graphics context
 is returned. If rw is true a new modifiable graphics context is
 returned.

Int_t MatchGC(const TGGC *gc, GCValues_t *values)

 Try to find matching graphics context. On success returns the amount
 of matching bits (which may be zero if masks have no common bits),
 -1 on failure (when there are common bits but not a single match).

void UpdateGC(TGGC *gc, GCValues_t *values)

 Update graphics context with the values spcified in values->fMask.

void Print(Option_t *)

 List all graphics contexts in the pool.

TGGCPool(const TGGCPool& gp)

TGGCPool& operator=(const TGGCPool& gp)

Author: Fons Rademakers 20/9/2000
Last update: root/gui:$Name: $:$Id: TGGC.cxx,v 1.14 2006/07/03 16:10:45 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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