QWaylandSurfaceGrabber Class

QWaylandSurfaceGrabber class allows to read the content of a QWaylandSurface 更多...

头：	#include <QWaylandSurfaceGrabber>
qmake:	QT += waylandcompositor
Since:	Qt 5.8
继承：	QObject

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公共类型

enum	Error { InvalidSurface, NoBufferAttached, UnknownBufferType, RendererNotReady }

公共函数

	QWaylandSurfaceGrabber (QWaylandSurface * surface , QObject * parent = Q_NULLPTR)
void	grab ()
QWaylandSurface *	surface () const

32 公共函数继承自 QObject

信号

void	failed (Error error )
void	success (const QImage & image )

2 信号继承自 QObject

额外继承成员

1 特性继承自 QObject
1 公共槽继承自 QObject
11 静态公共成员继承自 QObject
9 保护函数继承自 QObject

详细描述

QWaylandSurfaceGrabber class allows to read the content of a QWaylandSurface

Sometimes it is needed to get the contents of a surface, for example to provide a screenshot to the user. The QWaylandSurfaceGrabber class provides a simple method to do so, without having to care what type of buffer backs the surface, be it shared memory, OpenGL or something else.

成员类型文档编制

enum QWaylandSurfaceGrabber:: Error

The Error enum describes the reason for a grab failure.

常量	值	描述
`QWaylandSurfaceGrabber::InvalidSurface`	`0`	The surface is null or otherwise not valid.
`QWaylandSurfaceGrabber::NoBufferAttached`	`1`	The client has not attached a buffer on the surface yet.
`QWaylandSurfaceGrabber::UnknownBufferType`	`2`	The buffer attached on the surface is of an unknown type.
`QWaylandSurfaceGrabber::RendererNotReady`	`3`	The compositor renderer is not ready to grab the surface content.

成员函数文档编制

QWaylandSurfaceGrabber:: QWaylandSurfaceGrabber ( QWaylandSurface * surface , QObject * parent = Q_NULLPTR)

创建 QWaylandSurfaceGrabber 对象采用给定 surface and parent

`[signal]` void QWaylandSurfaceGrabber:: failed ( Error error )

void QWaylandSurfaceGrabber:: grab ()

Grab the content of the surface set on this object. It may not be possible to do that immediately so the success and failed signals should be used to be notified of when the grab is completed.

`[signal]` void QWaylandSurfaceGrabber:: success (const QImage & image )

QWaylandSurface *QWaylandSurfaceGrabber:: surface () const

Returns the surface set on this object

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