Key 類

class QPixmapCache ::Key

The QPixmapCache::Key 類可以用於有效訪問 QPixmapCache . 更多...

該類在 Qt 4.6 引入。

公共函數

Key ()
~Key ()
bool isValid () const

詳細描述

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.

成員函數文檔編製

Key:: Key ()

構造空的 Key 對象。

Key:: ~Key ()

銷毀 Key。

bool Key:: isValid () const

返迴 true if there is a cached pixmap associated with this key. Otherwise, if pixmap was flushed, the key is no longer valid.

該函數在 Qt 5.7 引入。