QSubtreeEnabler Class

(Qt3DRender::QSubtreeEnabler)

Enables or disables entire subtrees of framegraph nodes. More...

Header:	#include <QSubtreeEnabler>
qmake:	QT += 3drender
Since:	Qt 5.14
Instantiated By:	SubtreeEnabler
Inherits:	Qt3DRender::QFrameGraphNode

This class was introduced in Qt 5.14.

• List of all members, including inherited members

Public Types

enum	Enablement { Persistent, SingleShot }

Properties

• enablement : Enablement

Public Functions

Qt3DRender::QSubtreeEnabler::Enablement	enablement() const
void	requestUpdate()
void	setEnablement(Qt3DRender::QSubtreeEnabler::Enablement enablement)

Signals

void	enablementChanged(Qt3DRender::QSubtreeEnabler::Enablement enablement)

Detailed Description

While QFrameGraphNodes can be individually enabled and disabled via the enabled property, this can become tedious when an entire path needs to be turned on or off. QSubtreeEnabler is a convenience node that makes this use case trivial, allowing all of its children to be controlled by a single switch.

QSubtreeEnabler is enabled by default.

Member Type Documentation

enum QSubtreeEnabler::Enablement

Specifies whether subtree enablement is persistent or transient.

Constant	Value	Description
Qt3DRender::QSubtreeEnabler::Persistent	0	The value of enabled is persistent. This is the default.
Qt3DRender::QSubtreeEnabler::SingleShot	1	The value of enabled will last for a single frame and then be reset to false. This might be used for a subtree drawing to an FBO, for example, to only update the FBO when the relevant portions of the scene changed.

Member Function Documentation

void QSubtreeEnabler::requestUpdate()

Requests that the subtree be enabled.

A convenience method intended to be used with SingleShot enablement.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.