Qt Documentation

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

List of all members, including inherited members

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 Otherwise, if pixmap was flushed, the key is no longer valid.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.

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