内容

特性
公共函数
重实现公共函数
详细描述

QGraphicsSvgItem 类

The QGraphicsSvgItem 类是 QGraphicsItem 可用于渲染 SVG 文件的内容。更多...

头：	#include <QGraphicsSvgItem>
Since:	Qt 4.2
继承：	QGraphicsObject

特性

elementId : QString
maximumCacheSize : QSize

12 特性继承自 QGraphicsObject
1 特性继承自 QObject

公共函数

	QGraphicsSvgItem (QGraphicsItem * parent = 0)
	QGraphicsSvgItem (const QString & fileName , QGraphicsItem * parent = 0)
QString	elementId () const
QSize	maximumCacheSize () const
QSvgRenderer *	renderer () const
void	setElementId (const QString & id )
void	setMaximumCacheSize (const QSize & size )
void	setSharedRenderer (QSvgRenderer * renderer )

重实现公共函数

virtual QRectF	boundingRect () const
virtual void	paint (QPainter * painter , const QStyleOptionGraphicsItem * option , QWidget * widget = 0)
virtual int	type () const

2 公共函数继承自 QGraphicsObject
29 公共函数继承自 QObject
177 public functions inherited from QGraphicsItem

额外继承成员

1 公共槽继承自 QObject
9 信号继承自 QGraphicsObject
1 信号继承自 QObject
7 静态公共成员继承自 QObject
2 静态公共成员继承自 QGraphicsItem
8 保护函数继承自 QObject
24 保护函数继承自 QGraphicsItem
1 保护槽继承自 QGraphicsObject

详细描述

The QGraphicsSvgItem 类是 QGraphicsItem 可用于渲染 SVG 文件的内容。

QGraphicsSvgItem provides a way of rendering SVG files onto QGraphicsView . QGraphicsSvgItem can be created by passing the SVG file to be rendered to its constructor or by explicit setting a shared QSvgRenderer on it.

注意，设置 QSvgRenderer 在 QGraphicsSvgItem doesn't make the item take ownership of the renderer, therefore if using setSharedRenderer () method one has to make sure that the lifetime of the QSvgRenderer object will be at least as long as that of the QGraphicsSvgItem .

QGraphicsSvgItem provides a way of rendering only parts of the SVG files via the setElementId 。若 setElementId () method is called, only the SVG element (and its children) with the passed id will be renderer. This provides a convenient way of selectively rendering large SVG files that contain a number of discrete elements. For example the following code renders only jokers from a SVG file containing a whole card deck:

QSvgRenderer *renderer = new QSvgRenderer(QLatin1String("SvgCardDeck.svg"));
QGraphicsSvgItem *black = new QGraphicsSvgItem();
QGraphicsSvgItem *red   = new QGraphicsSvgItem();
black->setSharedRenderer(renderer);
black->setElementId(QLatin1String("black_joker"));
red->setSharedRenderer(renderer);
red->setElementId(QLatin1String("red_joker"));

Size of the item can be set via the setSize() 方法在边界矩形 or via direct manipulation of the items transformation matrix.

By default the SVG rendering is cached using QGraphicsItem::DeviceCoordinateCache mode to speedup the display of items. Caching can be disabled by passing QGraphicsItem::NoCache 到 QGraphicsItem::setCacheMode () 方法。

另请参阅 QSvgWidget , QtSvg 模块 , QGraphicsItem ，和 QGraphicsView .

特性文档编制

elementId : QString

This property holds the element's XML ID.

该特性在 Qt 4.6 引入。

访问函数：

QString	elementId () const
void	setElementId (const QString & id )

maximumCacheSize : QSize

This property holds the maximum size of the device coordinate cache for this item.

该特性在 Qt 4.6 引入。

访问函数：

QSize	maximumCacheSize () const
void	setMaximumCacheSize (const QSize & size )

成员函数文档编制

QGraphicsSvgItem:: QGraphicsSvgItem ( QGraphicsItem * parent = 0)

构造新的 SVG 项采用给定 parent .

QGraphicsSvgItem:: QGraphicsSvgItem (const QString & fileName , QGraphicsItem * parent = 0)

构造新的项采用给定 parent and loads the contents of the SVG file with the specified fileName .

`[虚拟]` QRectF QGraphicsSvgItem:: boundingRect () const

重实现自 QGraphicsItem::boundingRect ().

返回此项的边界矩形。

`[虚拟]` void QGraphicsSvgItem:: paint ( QPainter * painter , const QStyleOptionGraphicsItem * option , QWidget * widget = 0)

重实现自 QGraphicsItem::paint ().

QSvgRenderer * QGraphicsSvgItem:: renderer () const

Returns the currently use QSvgRenderer .

void QGraphicsSvgItem:: setSharedRenderer ( QSvgRenderer * renderer )

集 renderer to be a shared QSvgRenderer on the item. By using this method one can share the same QSvgRenderer on a number of items. This means that the SVG file will be parsed only once. QSvgRenderer passed to this method has to exist for as long as this item is used.

`[虚拟]` int QGraphicsSvgItem:: type () const

重实现自 QGraphicsItem::type ().

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