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.
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. |
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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