QWaylandView Class

The QWaylandView class represents a view of a surface on an output. 更多...

头：	#include <QWaylandView>
qmake:	QT += waylandcompositor
Since:	Qt 5.8
实例化：	WaylandView
继承：	QObject

该类在 Qt 5.8 引入。

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特性

• allowDiscardFrontBuffer : bool
• bufferLocked : bool
• output : QWaylandOutput*
• surface : QWaylandSurface*

公共函数

	QWaylandView (QObject * renderObject = nullptr, QObject * parent = nullptr)
virtual	~QWaylandView () override
virtual bool	advance ()
bool	allowDiscardFrontBuffer () const
virtual void	bufferCommitted (const QWaylandBufferRef & buffer , const QRegion & damage )
virtual QWaylandBufferRef	currentBuffer ()
virtual QRegion	currentDamage ()
virtual void	discardCurrentBuffer ()
bool	isBufferLocked () const
bool	isPrimary () const
QWaylandOutput *	output () const
void	setAllowDiscardFrontBuffer (bool discard )
void	setBufferLocked (bool locked )
void	setOutput (QWaylandOutput * output )
void	setPrimary ()
void	setSurface (QWaylandSurface * surface )
QWaylandSurface *	surface () const
struct wl_resource *	surfaceResource () const

信号

void	allowDiscardFrontBufferChanged ()
void	bufferLockedChanged ()
void	outputChanged ()
void	surfaceChanged ()

详细描述

The QWaylandView corresponds to the presentation of a surface on a specific output, managing the buffers that contain the contents to be rendered. You can have several views into the same surface.

特性文档编制

allowDiscardFrontBuffer : bool

By default, the view locks the current buffer until advance () is called. Set this property to true to allow Qt to release the buffer when the primary view is no longer using it.

This can be used to avoid the situation where a secondary view that updates on a lower frequency will throttle the frame rate of the client application.

访问函数：

bool	allowDiscardFrontBuffer () const
void	setAllowDiscardFrontBuffer (bool discard )

通知程序信号：

void	allowDiscardFrontBufferChanged ()

bufferLocked : bool

This property holds whether the view's buffer is currently locked. When the buffer is locked, advance () will not advance to the next buffer and returns false .

默认为 false .

访问函数：

bool	isBufferLocked () const
void	setBufferLocked (bool locked )

通知程序信号：

void	bufferLockedChanged ()

output : QWaylandOutput *

This property holds the output on which this view displays its surface.

访问函数：

QWaylandOutput *	output () const
void	setOutput (QWaylandOutput * output )

通知程序信号：

void	outputChanged ()

surface : QWaylandSurface *

This property holds the surface viewed by this QWaylandView .

访问函数：

QWaylandSurface *	surface () const
void	setSurface (QWaylandSurface * surface )

通知程序信号：

void	surfaceChanged ()

成员函数文档编制

QWaylandView:: QWaylandView ( QObject * renderObject = nullptr, QObject * parent = nullptr)

Constructs a QWaylandView with the given renderObject and parent .

[override virtual] QWaylandView:: ~QWaylandView ()

销毁 QWaylandView .

[虚拟] bool QWaylandView:: advance ()

Updates the current buffer and damage region to the latest version committed by the client. Returns true if new content was committed since the previous call to advance(). Otherwise returns false.

另请参阅 currentBuffer () 和 currentDamage ().

[虚拟] void QWaylandView:: bufferCommitted (const QWaylandBufferRef & buffer , const QRegion & damage )

This function is called when a new buffer is committed to this view's surface. damage contains the region that is different from the current buffer, i.e. the region that needs to be updated. The new buffer will become current on the next call to advance ().

Subclasses that reimplement this function must call the base implementation.

[虚拟] QWaylandBufferRef QWaylandView:: currentBuffer ()

Returns a reference to this view's current buffer.

[虚拟] QRegion QWaylandView:: currentDamage ()

Returns the current damage region of this view.

[虚拟] void QWaylandView:: discardCurrentBuffer ()

Force the view to discard its current buffer, to allow it to be reused on the client side.

bool QWaylandView:: isPrimary () const

返回 true，若此 QWaylandView is the primary view for the QWaylandSurface

另请参阅 QWaylandSurface::primaryView .

void QWaylandView:: setPrimary ()

Makes this QWaylandView the primary view for the surface.

It has no effect if this QWaylandView is not holding any QWaylandSurface

另请参阅 isPrimary () 和 QWaylandSurface::primaryView .

struct wl_resource *QWaylandView:: surfaceResource () const

Returns the Wayland surface resource for this QWaylandView .

内容

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• 公共函数

• 信号

• 详细描述