library: libGui
#include "TGGC.h"

TGGCPool


class description - 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) public:
TGGCPool(TGClient* client) TGGCPool(const TGGCPool&) 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 TGGCPool& operator=(const TGGCPool&) 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 *) const
 List all graphics contexts in the pool.



Inline Functions


            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
               void StreamerNVirtual(TBuffer& b)
           TGGCPool TGGCPool(const TGGCPool&)
          TGGCPool& operator=(const TGGCPool&)


Author: Fons Rademakers 20/9/2000
Last update: root/gui:$Name: $:$Id: TGGC.cxx,v 1.11 2004/09/06 14:12:51 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *


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