Key Class

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

This class was introduced in Qt 4.6.

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Publié le 27 décembre 2024 - Mis à jour le 27 décembre 2024

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Key Class▲

Header: Key
Since: Qt 4.6
qmake: QT += gui

Detailed Description▲

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.

[since 5.7] 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 Otherwise, if pixmap was flushed, the key is no longer valid.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.

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