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Internal/Contributor docs for the Qt SDK. Note: These are NOT official API docs; those are found at https://doc.qt.io/
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QFontCache Class Reference

#include <qfont_p.h>

+ Inheritance diagram for QFontCache:
+ Collaboration diagram for QFontCache:

Classes

struct  Engine
 
struct  Key
 

Public Types

typedef QMap< QFontDef, QFontEngineData * > EngineDataCache
 
typedef QMultiMap< Key, EngineEngineCache
 

Public Member Functions

 QFontCache ()
 
 ~QFontCache ()
 
int id () const
 
void clear ()
 
QFontEngineDatafindEngineData (const QFontDef &def) const
 
void insertEngineData (const QFontDef &def, QFontEngineData *engineData)
 
QFontEnginefindEngine (const Key &key)
 
void updateHitCountAndTimeStamp (Engine &value)
 
void insertEngine (const Key &key, QFontEngine *engine, bool insertMulti=false)
 
- Public Member Functions inherited from QObject
Q_INVOKABLE QObject (QObject *parent=nullptr)
 Constructs an object with parent object parent.
 
virtual ~QObject ()
 Destroys the object, deleting all its child objects.
 
virtual bool event (QEvent *event)
 This virtual function receives events to an object and should return true if the event e was recognized and processed.
 
virtual bool eventFilter (QObject *watched, QEvent *event)
 Filters events if this object has been installed as an event filter for the watched object.
 
QString objectName () const
 
Q_WEAK_OVERLOAD void setObjectName (const QString &name)
 Sets the object's name to name.
 
void setObjectName (QAnyStringView name)
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
QBindable< QStringbindableObjectName ()
 
bool isWidgetType () const
 Returns true if the object is a widget; otherwise returns false.
 
bool isWindowType () const
 Returns true if the object is a window; otherwise returns false.
 
bool isQuickItemType () const
 Returns true if the object is a QQuickItem; otherwise returns false.
 
bool signalsBlocked () const noexcept
 Returns true if signals are blocked; otherwise returns false.
 
bool blockSignals (bool b) noexcept
 If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).
 
QThreadthread () const
 Returns the thread in which the object lives.
 
bool moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
 Changes the thread affinity for this object and its children and returns true on success.
 
int startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
 This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.
 
int startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)
 
void killTimer (int id)
 Kills the timer with timer identifier, id.
 
void killTimer (Qt::TimerId id)
 
template<typename T >
findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.
 
template<typename T >
QList< T > findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.
 
template<typename T >
findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
template<typename T >
QList< T > findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
const QObjectListchildren () const
 Returns a list of child objects.
 
void setParent (QObject *parent)
 Makes the object a child of parent.
 
void installEventFilter (QObject *filterObj)
 Installs an event filter filterObj on this object.
 
void removeEventFilter (QObject *obj)
 Removes an event filter object obj from this object.
 
QMetaObject::Connection connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
 
bool disconnect (const char *signal=nullptr, const QObject *receiver=nullptr, const char *member=nullptr) const
 
bool disconnect (const QObject *receiver, const char *member=nullptr) const
 
void dumpObjectTree () const
 Dumps a tree of children to the debug output.
 
void dumpObjectInfo () const
 Dumps information about signal connections, etc.
 
bool setProperty (const char *name, const QVariant &value)
 Sets the value of the object's name property to value.
 
bool setProperty (const char *name, QVariant &&value)
 
QVariant property (const char *name) const
 Returns the value of the object's name property.
 
QList< QByteArraydynamicPropertyNames () const
 
QBindingStoragebindingStorage ()
 
const QBindingStoragebindingStorage () const
 
QObjectparent () const
 Returns a pointer to the parent object.
 
bool inherits (const char *classname) const
 Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.
 

Static Public Member Functions

static QFontCacheinstance ()
 
static void cleanup ()
 
- Static Public Member Functions inherited from QObject
static QMetaObject::Connection connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
 \threadsafe
 
static QMetaObject::Connection connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
 
template<typename Func1 , typename Func2 >
static QMetaObject::Connection connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType *context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)
 
template<typename Func1 , typename Func2 >
static QMetaObject::Connection connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)
 
static bool disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
 \threadsafe
 
static bool disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
 
static bool disconnect (const QMetaObject::Connection &)
 Disconnect a connection.
 
template<typename Func1 , typename Func2 >
static bool disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiver, Func2 slot)
 
template<typename Func1 >
static bool disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const QObject *receiver, void **zero)
 

Public Attributes

EngineDataCache engineDataCache
 
EngineCache engineCache
 
QHash< QFontEngine *, int > engineCacheCount
 

Private Member Functions

void timerEvent (QTimerEvent *event) override
 This event handler can be reimplemented in a subclass to receive timer events for the object.
 

Additional Inherited Members

- Public Slots inherited from QObject
void deleteLater ()
 \threadsafe
 
- Signals inherited from QObject
void destroyed (QObject *=nullptr)
 This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.
 
void objectNameChanged (const QString &objectName, QPrivateSignal)
 This signal is emitted after the object's name has been changed.
 
- Protected Member Functions inherited from QObject
QObjectsender () const
 Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.
 
int senderSignalIndex () const
 
int receivers (const char *signal) const
 Returns the number of receivers connected to the signal.
 
bool isSignalConnected (const QMetaMethod &signal) const
 
virtual void childEvent (QChildEvent *event)
 This event handler can be reimplemented in a subclass to receive child events.
 
virtual void customEvent (QEvent *event)
 This event handler can be reimplemented in a subclass to receive custom events.
 
virtual void connectNotify (const QMetaMethod &signal)
 
virtual void disconnectNotify (const QMetaMethod &signal)
 
 QObject (QObjectPrivate &dd, QObject *parent=nullptr)
 
- Protected Attributes inherited from QObject
QScopedPointer< QObjectDatad_ptr
 
- Properties inherited from QObject
QString objectName
 the name of this object
 

Detailed Description

Definition at line 215 of file qfont_p.h.

Member Typedef Documentation

◆ EngineCache

Definition at line 272 of file qfont_p.h.

◆ EngineDataCache

Constructor & Destructor Documentation

◆ QFontCache()

QFontCache::QFontCache ( )

Definition at line 3384 of file qfont.cpp.

◆ ~QFontCache()

QFontCache::~QFontCache ( )

Definition at line 3393 of file qfont.cpp.

Member Function Documentation

◆ cleanup()

void QFontCache::cleanup ( )
static

Definition at line 3370 of file qfont.cpp.

◆ clear()

void QFontCache::clear ( )

Definition at line 3398 of file qfont.cpp.

◆ findEngine()

QFontEngine * QFontCache::findEngine ( const Key & key)

Definition at line 3489 of file qfont.cpp.

◆ findEngineData()

QFontEngineData * QFontCache::findEngineData ( const QFontDef & def) const

Definition at line 3458 of file qfont.cpp.

◆ id()

int QFontCache::id ( ) const
inline

Definition at line 225 of file qfont_p.h.

◆ insertEngine()

void QFontCache::insertEngine ( const Key & key,
QFontEngine * engine,
bool insertMulti = false )

Definition at line 3516 of file qfont.cpp.

◆ insertEngineData()

void QFontCache::insertEngineData ( const QFontDef & def,
QFontEngineData * engineData )

Definition at line 3468 of file qfont.cpp.

◆ instance()

QFontCache * QFontCache::instance ( )
static

Definition at line 3362 of file qfont.cpp.

◆ timerEvent()

void QFontCache::timerEvent ( QTimerEvent * event)
overrideprivatevirtual

This event handler can be reimplemented in a subclass to receive timer events for the object.

QChronoTimer provides higher-level interfaces to the timer functionality, and also more general information about timers. The timer event is passed in the event parameter.

See also
startTimer(), killTimer(), event()

Reimplemented from QObject.

Definition at line 3581 of file qfont.cpp.

◆ updateHitCountAndTimeStamp()

void QFontCache::updateHitCountAndTimeStamp ( Engine & value)

Definition at line 3504 of file qfont.cpp.

Member Data Documentation

◆ engineCache

EngineCache QFontCache::engineCache

Definition at line 273 of file qfont_p.h.

◆ engineCacheCount

QHash<QFontEngine *, int> QFontCache::engineCacheCount

Definition at line 274 of file qfont_p.h.

◆ engineDataCache

EngineDataCache QFontCache::engineDataCache

Definition at line 257 of file qfont_p.h.


The documentation for this class was generated from the following files: