Key Class
(QPixmapCache::Key)The QPixmapCache::Key class can be used for efficient access to the QPixmapCache. More...
Header: | #include <Key> |
qmake: | QT += gui |
Since: | Qt 4.6 |
Public Functions
Key() | |
Key(Key &&other) | |
~Key() | |
bool | isValid() const |
void | swap(Key &other) |
bool | operator!=(const Key &key) const |
Key & | operator=(Key &&other) |
Detailed Description
The QPixmapCache::Key class can be used for efficient access to the QPixmapCache.
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.
Member Function Documentation
Key::Key()
Constructs an empty Key object.
Key::Key(Key &&other)
Default constructs an instance of Key.
Key::~Key()
Destroys the key.
bool Key::isValid() const
Returns true
if there is a cached pixmap associated with this key. Otherwise, if pixmap was flushed, the key is no longer valid.
This function was introduced in Qt 5.7.
void Key::swap(Key &other)
bool Key::operator!=(const Key &key) const
Key &Key::operator=(Key &&other)
Move-assignment operator.