The QIconEngine class provides an abstract base class for QIcon renderers. 更多...
| 头： | #include <QIconEngine> |
| 继承者： | QIconEngineV2 |
| virtual | ~QIconEngine () |
| virtual QSize | actualSize (const QSize & size , QIcon::Mode mode , QIcon::State state ) |
| virtual void | addFile (const QString & fileName , const QSize & size , QIcon::Mode mode , QIcon::State state ) |
| virtual void | addPixmap (const QPixmap & pixmap , QIcon::Mode mode , QIcon::State state ) |
| virtual void | paint (QPainter * painter , const QRect & rect , QIcon::Mode mode , QIcon::State state ) = 0 |
| virtual QPixmap | pixmap (const QSize & size , QIcon::Mode mode , QIcon::State state ) |
The QIconEngine class provides an abstract base class for QIcon renderers.
使用 QIconEngineV2 代替。
An icon engine provides the rendering functions for a QIcon . Each icon has a corresponding icon engine that is responsible for drawing the icon with a requested size, mode and state.
The icon is rendered by the paint () function, and the icon can additionally be obtained as a pixmap with the pixmap () function (the default implementation simply uses paint () to achieve this). The addPixmap () function can be used to add new pixmaps to the icon engine, and is used by QIcon to add specialized custom pixmaps.
The paint (), pixmap ()，和 addPixmap () functions are all virtual, and can therefore be reimplemented in subclasses of QIconEngine .
另请参阅 QIconEngineV2 and QIconEnginePlugin .
[虚拟]
QIconEngine::
~QIconEngine
()
Destroys the icon engine.
[虚拟]
QSize
QIconEngine::
actualSize
(const
QSize
&
size
,
QIcon::Mode
mode
,
QIcon::State
state
)
Returns the actual size of the icon the engine provides for the requested size , mode and state . The default implementation returns the given size .
[虚拟]
void
QIconEngine::
addFile
(const
QString
&
fileName
, const
QSize
&
size
,
QIcon::Mode
mode
,
QIcon::State
state
)
Called by QIcon::addFile (). Adds a specialized pixmap from the file with the given fileName , size , mode and state . The default pixmap-based engine stores any supplied file names, and it loads the pixmaps on demand instead of using scaled pixmaps if the size of a pixmap matches the size of icon requested. Custom icon engines that implement scalable vector formats are free to ignores any extra files.
[虚拟]
void
QIconEngine::
addPixmap
(const
QPixmap
&
pixmap
,
QIcon::Mode
mode
,
QIcon::State
state
)
Called by QIcon::addPixmap (). Adds a specialized pixmap 为给定 mode and state . The default pixmap-based engine stores any supplied pixmaps, and it uses them instead of scaled pixmaps if the size of a pixmap matches the size of icon requested. Custom icon engines that implement scalable vector formats are free to ignores any extra pixmaps.
[pure virtual]
void
QIconEngine::
paint
(
QPainter
*
painter
, const
QRect
&
rect
,
QIcon::Mode
mode
,
QIcon::State
state
)
Uses the given painter to paint the icon with the required mode and state 到矩形 rect .
[虚拟]
QPixmap
QIconEngine::
pixmap
(const
QSize
&
size
,
QIcon::Mode
mode
,
QIcon::State
state
)
Returns the icon as a pixmap with the required size , mode ，和 state . The default implementation creates a new pixmap and calls paint () to fill it.