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() | |
bool | isValid() const |
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()
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 Otherwise, if pixmap was flushed, the key is no longer valid.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.
© The Qt Company Ltd
Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-5.9/qpixmapcache-key.html