QGraphicsOpacityEffect 类

QGraphicsOpacityEffect 类提供不透明度效果。更多...

头：	#include <QGraphicsOpacityEffect>
CMake:	find_package(Qt6 REQUIRED COMPONENTS Widgets) target_link_libraries(mytarget PRIVATE Qt6::Widgets)
qmake:	QT += widgets
继承：	QGraphicsEffect

所有成员列表，包括继承成员

特性

opacity : qreal
opacityMask : QBrush

公共函数

	QGraphicsOpacityEffect (QObject * parent = nullptr)
virtual	~QGraphicsOpacityEffect ()
qreal	opacity () const
QBrush	opacityMask () const

公共槽

void	setOpacity (qreal opacity )
void	setOpacityMask (const QBrush & mask )

信号

void	opacityChanged (qreal opacity )
void	opacityMaskChanged (const QBrush & mask )

重实现保护函数

virtual void

draw (QPainter * painter ) override

详细描述

An opacity effect renders the source with an opacity. This effect is useful for making the source semi-transparent, similar to a fade-in/fade-out sequence. The opacity can be modified using the setOpacity () 函数。

默认情况下，不透明度是 0.7。

另请参阅 QGraphicsDropShadowEffect , QGraphicsBlurEffect ，和 QGraphicsColorizeEffect .

特性文档编制

opacity : qreal

此特性保持效果的不透明度。

The value should be in the range of 0.0 to 1.0, where 0.0 is fully transparent and 1.0 is fully opaque.

默认情况下，不透明度是 0.7。

访问函数：

qreal	opacity () const
void	setOpacity (qreal opacity )

通知程序信号：

void	opacityChanged (qreal opacity )

另请参阅 setOpacityMask ().

opacityMask : QBrush

This property holds the opacity mask of the effect.

An opacity mask allows you apply opacity to portions of an element.

例如：

...
QLinearGradient alphaGradient(rect.topLeft(), rect.bottomLeft());
alphaGradient.setColorAt(0.0, Qt::transparent);
alphaGradient.setColorAt(0.5, Qt::black);
alphaGradient.setColorAt(1.0, Qt::transparent);
QGraphicsOpacityEffect *effect = new QGraphicsOpacityEffect;
effect->setOpacityMask(alphaGradient);
...

There is no opacity mask by default.

访问函数：

QBrush	opacityMask () const
void	setOpacityMask (const QBrush & mask )

通知程序信号：

void	opacityMaskChanged (const QBrush & mask )

另请参阅 setOpacity ().

成员函数文档编制

QGraphicsOpacityEffect:: QGraphicsOpacityEffect ( QObject * parent = nullptr)

Constructs a new QGraphicsOpacityEffect instance. The parent 参数会被传递给 QGraphicsEffect 的构造函数。

`[虚拟]` QGraphicsOpacityEffect:: ~QGraphicsOpacityEffect ()

销毁效果。

`[override virtual protected]` void QGraphicsOpacityEffect:: draw ( QPainter * painter )

重实现： QGraphicsEffect::draw (QPainter *painter).

`[signal]` void QGraphicsOpacityEffect:: opacityChanged ( qreal opacity )

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

注意： 通知程序信号对于特性 opacity .

`[signal]` void QGraphicsOpacityEffect:: opacityMaskChanged (const QBrush & mask )

This signal is emitted whenever the effect's opacity mask changes. The mask parameter holds the effect's new opacity mask.

注意： 通知程序信号对于特性 opacityMask .