QCameraZoomControl Class

The QCameraZoomControl class supplies control for optical and digital camera zoom. More...

Header: #include <QCameraZoomControl>
qmake: QT += multimedia
Inherits: QMediaControl

Public Functions

virtual ~QCameraZoomControl()
virtual qreal currentDigitalZoom() const = 0
virtual qreal currentOpticalZoom() const = 0
virtual qreal maximumDigitalZoom() const = 0
virtual qreal maximumOpticalZoom() const = 0
virtual qreal requestedDigitalZoom() const = 0
virtual qreal requestedOpticalZoom() const = 0
virtual void zoomTo(qreal optical, qreal digital) = 0

Signals

void currentDigitalZoomChanged(qreal zoom)
void currentOpticalZoomChanged(qreal zoom)
void maximumDigitalZoomChanged(qreal zoom)
void maximumOpticalZoomChanged(qreal zoom)
void requestedDigitalZoomChanged(qreal zoom)
void requestedOpticalZoomChanged(qreal zoom)

Protected Functions

QCameraZoomControl(QObject *parent = nullptr)

Macros

Detailed Description

The interface name of QCameraZoomControl is org.qt-project.qt.camerazoomcontrol/5.0 as defined in QCameraZoomControl_iid.

See also QMediaService::requestControl() and QCamera.

Member Function Documentation

[protected] QCameraZoomControl::QCameraZoomControl(QObject *parent = nullptr)

Constructs a camera zoom control object with parent.

[signal] void QCameraZoomControl::currentDigitalZoomChanged(qreal zoom)

Signal emitted when the current digital zoom value changed.

[signal] void QCameraZoomControl::currentOpticalZoomChanged(qreal zoom)

Signal emitted when the current optical zoom value changed.

[signal] void QCameraZoomControl::maximumDigitalZoomChanged(qreal zoom)

Signal emitted when the maximum supported digital zoom value changed.

The maximum supported zoom value can depend on other camera settings, like capture mode or resolution.

[signal] void QCameraZoomControl::maximumOpticalZoomChanged(qreal zoom)

Signal emitted when the maximum supported optical zoom value changed.

The maximum supported zoom value can depend on other camera settings, like focusing mode.

[signal] void QCameraZoomControl::requestedDigitalZoomChanged(qreal zoom)

Signal emitted when the requested digital zoom value changed.

[signal] void QCameraZoomControl::requestedOpticalZoomChanged(qreal zoom)

Signal emitted when the requested optical zoom value changed.

[virtual] QCameraZoomControl::~QCameraZoomControl()

Destruct the camera zoom control object.

[pure virtual] qreal QCameraZoomControl::currentDigitalZoom() const

Return the current digital zoom value.

[pure virtual] qreal QCameraZoomControl::currentOpticalZoom() const

Return the current optical zoom value.

[pure virtual] qreal QCameraZoomControl::maximumDigitalZoom() const

Returns the maximum digital zoom value, or 1.0 if digital zoom is not supported.

[pure virtual] qreal QCameraZoomControl::maximumOpticalZoom() const

Returns the maximum optical zoom value, or 1.0 if optical zoom is not supported.

[pure virtual] qreal QCameraZoomControl::requestedDigitalZoom() const

Return the requested digital zoom value.

[pure virtual] qreal QCameraZoomControl::requestedOpticalZoom() const

Return the requested optical zoom value.

[pure virtual] void QCameraZoomControl::zoomTo(qreal optical, qreal digital)

Sets optical and digital zoom values.

Zooming can be asynchronous with value changes reported with currentDigitalZoomChanged() and currentOpticalZoomChanged() signals.

The backend should expect and correctly handle frequent zoomTo() calls during zoom animations or slider movements.

Macro Documentation

QCameraZoomControl::QCameraZoomControl_iid

org.qt-project.qt.camerazoomcontrol/5.0

Defines the interface name of the QCameraZoomControl class.

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