QSubtreeEnabler Class

class Qt3DRender::QSubtreeEnabler

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

Header: #include <QSubtreeEnabler>
CMake: find_package(Qt6 COMPONENTS 3drender REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::3drender)
qmake: QT += 3drender
Since: Qt 5.14
Instantiated By: SubtreeEnabler
Inherits: Qt3DRender::QFrameGraphNode

Public Types

enum Enablement { Persistent, SingleShot }

Properties

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.

ConstantValueDescription
Qt3DRender::QSubtreeEnabler::Persistent0The value of enabled is persistent. This is the default.
Qt3DRender::QSubtreeEnabler::SingleShot1The 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.

Property Documentation

enablement : Enablement

Controls whether subtree enablement is persistent or transient.

Access functions:

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

Notifier signal:

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

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.

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