QPixmapCache::Key Class Reference

The QPixmapCache::Key class can be used for efficient access to the QPixmapCache. More...

#include <qpixmapcache.h>

Collaboration diagram for QPixmapCache::Key:

Public Member Functions
	Key ()
	Constructs an empty Key object.
	Key (const Key &other)
	Key (Key &&other) noexcept
Key &	operator= (Key &&other) noexcept
	~Key ()
	Destroys the key.
bool	operator== (const Key &key) const
bool	operator!= (const Key &key) const
Key &	operator= (const Key &other)
void	swap (Key &other) noexcept
bool	isValid () const noexcept
	Returns true if there is a cached pixmap associated with this key.

Friends
class	QPMCache
class	QPixmapCache
size_t	qHash (const QPixmapCache::Key &k, size_t seed=0) noexcept

Detailed Description

The QPixmapCache::Key class can be used for efficient access to the QPixmapCache.

\inmodule QtGui

Use QPixmapCache::insert() to receive an instance of Key generated by the pixmap cache. You can store the key in your own objects for a very efficient one-to-one object-to-pixmap mapping.

Definition at line 17 of file qpixmapcache.h.

Constructor & Destructor Documentation

Key() [1/3]

QPixmapCache::Key::Key

(

)

Constructs an empty Key object.

Definition at line 94 of file qpixmapcache.cpp.

Key() [2/3]

QPixmapCache::Key::Key

(

const Key &

other

)

Constructs a copy of other.

Definition at line 102 of file qpixmapcache.cpp.

Key() [3/3]

QPixmapCache::Key::Key ( Key && other )

inlinenoexcept

Since

5.6

Definition at line 22 of file qpixmapcache.h.

~Key()

QPixmapCache::Key::~Key

(

)

Destroys the key.

Definition at line 112 of file qpixmapcache.cpp.

Member Function Documentation

isValid()

bool QPixmapCache::Key::isValid ( ) const

noexcept

Returns true if there is a cached pixmap associated with this key.

Otherwise, if pixmap was flushed, the key is no longer valid.

Since

5.7

Definition at line 157 of file qpixmapcache.cpp.

operator!=()

bool QPixmapCache::Key::operator!= ( const Key & key ) const

inline

Definition at line 26 of file qpixmapcache.h.

operator=() [1/2]

QPixmapCache::Key & QPixmapCache::Key::operator=

(

const Key &

other

)

Definition at line 165 of file qpixmapcache.cpp.

operator=() [2/2]

Key & QPixmapCache::Key::operator= ( Key && other )

inlinenoexcept

Since

5.6

Definition at line 23 of file qpixmapcache.h.

operator==()

bool QPixmapCache::Key::operator==

(

const Key &

key

)

const

Returns true if this key is the same as the given key; otherwise returns false.

Definition at line 124 of file qpixmapcache.cpp.

swap()

void QPixmapCache::Key::swap ( Key & other )

inlinenoexcept

Since

5.6 \memberswap{key}

Definition at line 30 of file qpixmapcache.h.

Friends And Related Symbol Documentation

qHash

size_t qHash ( const QPixmapCache::Key & k, size_t seed = 0 )

friend

Since

6.6 \qhash{QPixmapCache::Key}

Definition at line 34 of file qpixmapcache.h.

QPixmapCache

friend class QPixmapCache

friend

Definition at line 40 of file qpixmapcache.h.

QPMCache

friend class QPMCache

friend

Definition at line 39 of file qpixmapcache.h.

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

• qtbase/src/gui/image/qpixmapcache.h (7fa3267fda6cff720cca44e829f9a39789031a54)
• qtbase/src/gui/image/qpixmapcache.cpp (ca8674ef2cdbacfa7a3034138cb65f45b56c33f1)