内容

• 特性
• 公共函数
• 重实现公共函数
• 公共槽
• 信号
• 重实现保护函数
• 详细描述

QGraphicsDropShadowEffect 类

QGraphicsDropShadowEffect class provides a drop shadow effect. 更多...

头：	#include <QGraphicsDropShadowEffect>
qmake:	QT += widgets
Since:	Qt 4.6
继承：	QGraphicsEffect

• 所有成员列表，包括继承成员

特性

blurRadius : qreal color : QColor offset : QPointF

xOffset : qreal yOffset : qreal

• 1 特性继承自 QGraphicsEffect
• 1 特性继承自 QObject

公共函数

	QGraphicsDropShadowEffect (QObject * parent = Q_NULLPTR)
	~QGraphicsDropShadowEffect ()
qreal	blurRadius () const
QColor	color () const
QPointF	offset () const
qreal	xOffset () const
qreal	yOffset () const

重实现公共函数

virtual QRectF

boundingRectFor (const QRectF & rect ) const

• 3 公共函数继承自 QGraphicsEffect
• 32 公共函数继承自 QObject

公共槽

void	setBlurRadius (qreal blurRadius )
void	setColor (const QColor & color )
void	setOffset (const QPointF & ofs )
void	setOffset (qreal dx , qreal dy )
void	setOffset (qreal d )
void	setXOffset (qreal dx )
void	setYOffset (qreal dy )

• 2 public slots inherited from QGraphicsEffect
• 1 公共槽继承自 QObject

信号

void	blurRadiusChanged (qreal blurRadius )
void	colorChanged (const QColor & color )
void	offsetChanged (const QPointF & offset )

• 1 信号继承自 QGraphicsEffect
• 2 信号继承自 QObject

重实现保护函数

virtual void

draw (QPainter * painter )

• 7 protected functions inherited from QGraphicsEffect
• 9 保护函数继承自 QObject

额外继承成员

• 11 静态公共成员继承自 QObject
• 7 protected functions inherited from QGraphicsEffect
• 9 保护函数继承自 QObject

详细描述

QGraphicsDropShadowEffect class provides a drop shadow effect.

A drop shadow effect renders the source with a drop shadow. The color of the drop shadow can be modified using the setColor () function. The drop shadow offset can be modified using the setOffset () function and the blur radius of the drop shadow can be changed with the setBlurRadius () 函数。

By default, the drop shadow is a semi-transparent dark gray ( QColor (63, 63, 63, 180)) shadow, blurred with a radius of 1 at an offset of 8 pixels towards the lower right. The drop shadow offset is specified in device coordinates.

另请参阅 QGraphicsBlurEffect , QGraphicsColorizeEffect ，和 QGraphicsOpacityEffect .

特性文档编制

blurRadius : qreal

This property holds the blur radius in pixels of the drop shadow.

Using a smaller radius results in a sharper shadow, whereas using a bigger radius results in a more blurred shadow.

By default, the blur radius is 1 pixel.

访问函数：

qreal	blurRadius () const
void	setBlurRadius (qreal blurRadius )

通知程序信号：

void	blurRadiusChanged (qreal blurRadius )

另请参阅 color () 和 offset ().

color : QColor

This property holds the color of the drop shadow.

By default, the drop color is a semi-transparent dark gray ( QColor (63, 63, 63, 180)).

访问函数：

QColor	color () const
void	setColor (const QColor & color )

通知程序信号：

void	colorChanged (const QColor & color )

另请参阅 offset () 和 blurRadius ().

offset : QPointF

This property holds the shadow offset in pixels.

By default, the offset is 8 pixels towards the lower right.

The offset is given in device coordinates, which means it is unaffected by scale.

访问函数：

QPointF	offset () const
void	setOffset (const QPointF & ofs )
void	setOffset (qreal dx , qreal dy )
void	setOffset (qreal d )

通知程序信号：

void	offsetChanged (const QPointF & offset )

另请参阅 xOffset (), yOffset (), blurRadius ()，和 color ().

xOffset : qreal

This property holds the horizontal shadow offset in pixels.

By default, the horizontal shadow offset is 8 pixels.

访问函数：

qreal	xOffset () const
void	setXOffset (qreal dx )

通知程序信号：

void	offsetChanged (const QPointF & offset )

另请参阅 yOffset () 和 offset ().

yOffset : qreal

This property holds the vertical shadow offset in pixels.

By default, the vertical shadow offset is 8 pixels.

访问函数：

qreal	yOffset () const
void	setYOffset (qreal dy )

通知程序信号：

void	offsetChanged (const QPointF & offset )

另请参阅 xOffset () 和 offset ().

成员函数文档编制

QGraphicsDropShadowEffect:: QGraphicsDropShadowEffect ( QObject * parent = Q_NULLPTR)

构造新的 QGraphicsDropShadowEffect instance. The parent 参数会被传递给 QGraphicsEffect 的构造函数。

QGraphicsDropShadowEffect:: ~QGraphicsDropShadowEffect ()

销毁效果。

[signal] void QGraphicsDropShadowEffect:: blurRadiusChanged ( qreal blurRadius )

This signal is emitted whenever the effect's blur radius changes. The blurRadius parameter holds the effect's new blur radius.

注意： 通知程序信号对于特性 blurRadius .

[virtual] QRectF QGraphicsDropShadowEffect:: boundingRectFor (const QRectF & rect ) const

重实现自 QGraphicsEffect::boundingRectFor ().

[signal] void QGraphicsDropShadowEffect:: colorChanged (const QColor & color )

此信号被发射，每当效果的颜色改变时。 color 参数保持效果的新颜色。

注意： 通知程序信号对于特性 color .

[virtual protected] void QGraphicsDropShadowEffect:: draw ( QPainter * painter )

重实现自 QGraphicsEffect::draw ().

[signal] void QGraphicsDropShadowEffect:: offsetChanged (const QPointF & offset )

This signal is emitted whenever the effect's shadow offset changes. The offset parameter holds the effect's new shadow offset.

注意： 通知程序信号对于特性 offset . Notifier signal for property xOffset . Notifier signal for property yOffset .