Key 类

class QPixmapCache ::Key

The QPixmapCache::Key 类可以用于有效访问 QPixmapCache . 更多...

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公共函数

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

详细描述

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.

成员函数文档编制

Key:: Key ()

构造空的 Key 对象。

`[noexcept]` Key:: ~Key ()

销毁 Key。

`[noexcept]` bool Key:: isValid () const

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 Otherwise, if pixmap was flushed, the key is no longer valid.