This class was introduced in Qt 4.6.
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.
Constructs an empty Key object.
Destroys the key.
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 Otherwise, if pixmap was flushed, the key is no longer valid.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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