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/Qt 5.11

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 Otherwise, if pixmap was flushed, the key is no longer valid.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/qpixmapcache-key.html