The QPixmapCache::Key 类可以用于有效访问 QPixmapCache . 更多...
头: | #include <Key> |
qmake: | QT += gui |
Since: | Qt 4.6 |
Key () | |
~Key () | |
bool | isValid () const |
The QPixmapCache::Key 类可以用于有效访问 QPixmapCache .
使用 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.
构造空的 Key 对象。
销毁 Key。
返回
true
if there is a cached pixmap associated with this key. Otherwise, if pixmap was flushed, the key is no longer valid.
该函数在 Qt 5.7 引入。