class TGFontPool: public TGObject


TGFont and TGFontPool

Encapsulate fonts used in the GUI system.
TGFontPool provides a pool of fonts.
TGTextLayout is used to keep track of string  measurement
information when  using the text layout facilities.
It can be displayed with respect to any origin.


Function Members (Methods)

public:
TGFontPool(TGClient* client)
virtual~TGFontPool()
voidTObject::AbstractMethod(const char* method) const
virtual voidTObject::AppendPad(Option_t* option = "")
virtual voidTObject::Browse(TBrowser* b)
static TClass*Class()
virtual const char*TObject::ClassName() const
virtual voidTObject::Clear(Option_t* = "")
virtual TObject*TObject::Clone(const char* newname = "") const
virtual Int_tTObject::Compare(const TObject* obj) const
virtual voidTObject::Copy(TObject& object) const
virtual voidTObject::Delete(Option_t* option = "")MENU
virtual Int_tTObject::DistancetoPrimitive(Int_t px, Int_t py)
virtual voidTObject::Draw(Option_t* option = "")
virtual voidTObject::DrawClass() constMENU
virtual TObject*TObject::DrawClone(Option_t* option = "") constMENU
virtual voidTObject::Dump() constMENU
virtual voidTObject::Error(const char* method, const char* msgfmt) const
virtual voidTObject::Execute(const char* method, const char* params, Int_t* error = 0)
virtual voidTObject::Execute(TMethod* method, TObjArray* params, Int_t* error = 0)
virtual voidTObject::ExecuteEvent(Int_t event, Int_t px, Int_t py)
virtual voidTObject::Fatal(const char* method, const char* msgfmt) const
TGFont*FindFont(FontStruct_t font) const
TGFont*FindFontByHandle(FontH_t font) const
virtual TObject*TObject::FindObject(const char* name) const
virtual TObject*TObject::FindObject(const TObject* obj) const
voidFreeAttributeInfo(char** info)
voidFreeFont(const TGFont* font)
voidFreeFontFamilies(char** f)
char**GetAttributeInfo(const FontAttributes_t* fa)
TGClient*TGObject::GetClient() const
virtual Option_t*TObject::GetDrawOption() const
static Long_tTObject::GetDtorOnly()
TGFont*GetFont(const TGFont* font)
TGFont*GetFont(FontStruct_t font)
TGFont*GetFont(const char* font, Bool_t fixedDefault = kTRUE)
TGFont*GetFont(const char* family, Int_t ptsize, Int_t weight, Int_t slant)
char**GetFontFamilies()
virtual const char*TObject::GetIconName() const
Handle_tTGObject::GetId() const
virtual const char*TObject::GetName() const
virtual char*TObject::GetObjectInfo(Int_t px, Int_t py) const
static Bool_tTObject::GetObjectStat()
virtual Option_t*TObject::GetOption() const
virtual const char*TObject::GetTitle() const
virtual UInt_tTObject::GetUniqueID() const
virtual Bool_tTObject::HandleTimer(TTimer* timer)
virtual ULong_tTGObject::Hash() const
virtual voidTObject::Info(const char* method, const char* msgfmt) const
virtual Bool_tTObject::InheritsFrom(const char* classname) const
virtual Bool_tTObject::InheritsFrom(const TClass* cl) const
virtual voidTObject::Inspect() constMENU
voidTObject::InvertBit(UInt_t f)
virtual TClass*IsA() const
virtual Bool_tTGObject::IsEqual(const TObject* obj) const
virtual Bool_tTObject::IsFolder() const
Bool_tTObject::IsOnHeap() const
virtual Bool_tTObject::IsSortable() const
Bool_tTObject::IsZombie() const
virtual voidTObject::ls(Option_t* option = "") const
voidTObject::MayNotUse(const char* method) const
const char*NameOfFont(TGFont* font)
virtual Bool_tTObject::Notify()
static voidTObject::operator delete(void* ptr)
static voidTObject::operator delete(void* ptr, void* vp)
static voidTObject::operator delete[](void* ptr)
static voidTObject::operator delete[](void* ptr, void* vp)
void*TObject::operator new(size_t sz)
void*TObject::operator new(size_t sz, void* vp)
void*TObject::operator new[](size_t sz)
void*TObject::operator new[](size_t sz, void* vp)
virtual voidTObject::Paint(Option_t* option = "")
Bool_tParseFontName(const char* string, FontAttributes_t* fa)
virtual voidTObject::Pop()
virtual voidPrint(Option_t* option = "") const
virtual Int_tTObject::Read(const char* name)
virtual voidTObject::RecursiveRemove(TObject* obj)
voidTObject::ResetBit(UInt_t f)
virtual voidTGObject::SaveAs(const char* filename = "", Option_t* option = "") const
virtual voidTObject::SavePrimitive(basic_ostream<char,char_traits<char> >& out, Option_t* option = "")
voidTObject::SetBit(UInt_t f)
voidTObject::SetBit(UInt_t f, Bool_t set)
virtual voidTObject::SetDrawOption(Option_t* option = "")MENU
static voidTObject::SetDtorOnly(void* obj)
static voidTObject::SetObjectStat(Bool_t stat)
virtual voidTObject::SetUniqueID(UInt_t uid)
virtual voidShowMembers(TMemberInspector& insp, char* parent)
virtual voidStreamer(TBuffer& b)
voidStreamerNVirtual(TBuffer& b)
virtual voidTObject::SysError(const char* method, const char* msgfmt) const
Bool_tTObject::TestBit(UInt_t f) const
Int_tTObject::TestBits(UInt_t f) const
virtual voidTObject::UseCurrentStyle()
virtual voidTObject::Warning(const char* method, const char* msgfmt) const
virtual Int_tTObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0)
virtual Int_tTObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0) const
protected:
virtual voidTObject::DoError(int level, const char* location, const char* fmt, va_list va) const
Bool_tFieldSpecified(const char* field)
intFindStateNum(const FontStateMap_t* map, const char* strKey)
const char*FindStateString(const FontStateMap_t* map, int numKey)
TGFont*GetFontFromAttributes(FontAttributes_t* fa, TGFont* fontPtr)
TGFont*GetNativeFont(const char* name, Bool_t fixedDefault = kTRUE)
const char*GetUid(const char* string)
TGFont*MakeFont(TGFont* font, FontStruct_t fontStruct, const char* fontName)
voidTObject::MakeZombie()
Bool_tParseXLFD(const char* string, XLFDAttributes_t* xa)
private:
TGFontPool(const TGFontPool& fp)
TGFontPool&operator=(const TGFontPool& fp)

Data Members

public:
enum TObject::EStatusBits { kCanDelete
kMustCleanup
kObjInCanvas
kIsReferenced
kHasUUID
kCannotPick
kNoContextMenu
kInvalidObject
};
enum TObject::[unnamed] { kIsOnHeap
kNotDeleted
kZombie
kBitMask
kSingleKey
kOverwrite
kWriteDelete
};
protected:
TGClient*TGObject::fClientConnection to display server
Handle_tTGObject::fIdX11/Win32 Window identifier
private:
THashTable*fListTGFont objects pool
THashTable*fNamedTableMap a name to a set of attributes for a font
THashTable*fUidTableHash table for some used string values like family names, etc.

Class Charts

Inheritance Inherited Members Includes Libraries
Class Charts

Function documentation

TGFontPool(TGClient *client)
 Create a font pool.
~TGFontPool()
 Cleanup font pool.
TGFont * GetFont(const char* font, Bool_t fixedDefault = kTRUE)
 Get the specified font.
 The font can be one of the following forms:
        XLFD (see X documentation)
        "Family [size [style] [style ...]]"
 Returns 0 if error or no font can be found.
 If fixedDefault is false the "fixed" font will not be substituted
 as fallback when the asked for font does not exist.
TGFont * GetFont(const TGFont *font)
 Use font, i.e. increases ref count of specified font. Returns 0
 if font is not found.
TGFont * GetFont(FontStruct_t fs)
 Use font, i.e. increases ref count of specified font.
TGFont * GetFont(const char* family, Int_t ptsize, Int_t weight, Int_t slant)
 Returns font specified bay family, pixel/point size, weight and slant
  negative value of ptsize means size in pixels
  positive value of ptsize means size in points

  For example:
    TGFont *font = fpool->GetFont("helvetica", -9, kFontWeightNormal, kFontSlantRoman);
    font->Print();
void FreeFont(const TGFont* font)
 Free font. If ref count is 0 delete font.
TGFont * FindFont(FontStruct_t font) const
 Find font based on its font struct. Returns 0 if font is not found.
TGFont * FindFontByHandle(FontH_t font) const
 Find font based on its font handle. Returns 0 if font is not found.
const char * GetUid(const char* string)
 Given a string, this procedure returns a unique identifier for the string.

 This procedure returns a pointer to a new char string corresponding to
 the "string" argument. The new string has a value identical to string
 (strcmp will return 0), but it's guaranteed that any other calls to this
 procedure with a string equal to "string" will return exactly the same
 result (i.e. can compare pointer *values* directly, without having to
 call strcmp on what they point to).
char ** GetAttributeInfo(const FontAttributes_t* fa)
 Return information about the font attributes as an array of strings.

 An array of FONT_NUMFIELDS strings is returned holding the value of the
 font attributes in the following order:
 family size weight slant underline overstrike
void FreeAttributeInfo(char** info)
 Free attributes info.
void Print(Option_t* option = "") const
 List all fonts in the pool.
Bool_t ParseFontName(const char* string, FontAttributes_t* fa)
 Converts a string into a set of font attributes that can be used to
 construct a font.

 The string can be one of the following forms:
        XLFD (see X documentation)
        "Family [size [style] [style ...]]"

 The return value is kFALSE if the object was syntactically
 invalid. Otherwise, fills the font attribute buffer with the values
 parsed from the string and returns kTRUE. The structure must already be
 properly initialized.
Bool_t ParseXLFD(const char* string, XLFDAttributes_t* xa)
 Break up a fully specified XLFD into a set of font attributes.

 Return value is kFALSE if string was not a fully specified XLFD.
 Otherwise, fills font attribute buffer with the values parsed from
 the XLFD and returns kTRUE.

 string -- Parseable font description string.
 xa     -- XLFD attributes structure whose fields are to be modified.
           Structure must already be properly initialized.
Int_t FindStateNum(const FontStateMap_t* map, const char* strKey)
 Given a lookup table, map a string to a number in the table.

 If strKey was equal to the string keys of one of the elements in the
 table, returns the numeric key of that element. Returns the numKey
 associated with the last element (the NULL string one) in the table
 if strKey was not equal to any of the string keys in the table.
const char * FindStateString(const FontStateMap_t* map, int numKey)
 Given a lookup table, map a number to a string in the table.

 If numKey was equal to the numeric key of one of the elements in the
 table, returns the string key of that element. Returns NULL if numKey
 was not equal to any of the numeric keys in the table
Bool_t FieldSpecified(const char* field)
 Helper function for ParseXLFD(). Determines if a field in the XLFD was
 set to a non-null, non-don't-care value.

 The return value is kFALSE if the field in the XLFD was not set and
 should be ignored, kTRUE otherwise.

 field -- The field of the XLFD to check. Strictly speaking, only when
          the string is "*" does it mean don't-care. However, an
          unspecified or question mark is also interpreted as don't-care.
const char * NameOfFont(TGFont* font)
 Given a font, return a textual string identifying it.
char ** GetFontFamilies()
 Return information about the font families that are available on the
 current display.

 An array of strings is returned holding a list of all the available font
 families. The array is terminated with a NULL pointer.
void FreeFontFamilies(char** f)
 Delete an array of families allocated GetFontFamilies() method
TGFont * GetFontFromAttributes(FontAttributes_t* fa, TGFont* fontPtr)
 Given a desired set of attributes for a font, find a font with the
 closest matching attributes and create a new TGFont object.
 The return value is a pointer to a TGFont object that represents the
 font with the desired attributes. If a font with the desired attributes
 could not be constructed, some other font will be substituted
 automatically.

 Every call to this procedure returns a new TGFont object, even if the
 specified attributes have already been seen before.
TGFont * GetNativeFont(const char* name, Bool_t fixedDefault = kTRUE)
 The return value is a pointer to an TGFont object that represents the
 native font. If a native font by the given name could not be found,
 the return value is NULL.

 Every call to this procedure returns a new TGFont object, even if the
 name has already been seen before. The caller should call FreeFont
 when the font is no longer needed.
TGFont * MakeFont(TGFont* font, FontStruct_t fontStruct, const char* fontName)
 Helper for GetNativeFont() and GetFontFromAttributes(). Creates and
 intializes a new TGFont object.

 font       -- If non-NULL, store the information in this existing TGFont
               object, rather than creating a new one; the existing
               contents of the font will be released. If NULL, a new
               TGFont object is created.
 fontStruct -- information about font.
 fontName   -- The string passed to TVirtualX::LoadQueryFont() to construct the
               fontStruct.
FontAttributes_t& operator=(const TGFontPool& fp)
TGFontPool(const TGFontPool& fp)

Author: Fons Rademakers 20/5/2003
Last change: root/gui:$Id: TGFont.h 23115 2008-04-10 13:35:37Z rdm $
Last generated: 2008-06-25 08:40
Copyright (C) 1995-2003, Rene Brun and Fons Rademakers. *

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