QVideoWidget Class

The QVideoWidget class provides a widget which presents video produced by a media object. More...

Header: #include <QVideoWidget>
qmake: QT += multimediawidgets
Inherits: QWidget and QMediaBindableInterface
Inherited By:



  • 59 properties inherited from QWidget
  • 1 property inherited from QObject

Public Functions

QVideoWidget(QWidget *parent = nullptr)
virtual ~QVideoWidget()
Qt::AspectRatioMode aspectRatioMode() const
int brightness() const
int contrast() const
int hue() const
bool isFullScreen() const
int saturation() const

Reimplemented Public Functions

virtual QMediaObject *mediaObject() const override
virtual QSize sizeHint() const override

Public Slots

void setAspectRatioMode(Qt::AspectRatioMode mode)
void setBrightness(int brightness)
void setContrast(int contrast)
void setFullScreen(bool fullScreen)
void setHue(int hue)
void setSaturation(int saturation)
  • 19 public slots inherited from QWidget
  • 1 public slot inherited from QObject


void brightnessChanged(int brightness)
void contrastChanged(int contrast)
void fullScreenChanged(bool fullScreen)
void hueChanged(int hue)
void saturationChanged(int saturation)

Reimplemented Protected Functions

virtual bool event(QEvent *event) override
virtual void hideEvent(QHideEvent *event) override
virtual void moveEvent(QMoveEvent *event) override
virtual void paintEvent(QPaintEvent *event) override
virtual void resizeEvent(QResizeEvent *event) override
virtual void showEvent(QShowEvent *event) override
typedef QObjectList
QList<T> qFindChildren(const QObject *obj, const QRegExp &regExp)
T qobject_cast(QObject *object)
T qobject_cast(const QObject *object)


Additional Inherited Members

Detailed Description

Attaching a QVideoWidget to a QMediaObject allows it to display the video or image output of that media object. A QVideoWidget is attached to media object by passing a pointer to the QMediaObject in its constructor, and detached by destroying the QVideoWidget.

player = new QMediaPlayer;

playlist = new QMediaPlaylist(player);

videoWidget = new QVideoWidget;


Note: Only a single display output can be attached to a media object at one time.

See also QMediaObject, QMediaPlayer, and QGraphicsVideoItem.

Property Documentation

aspectRatioMode : Qt::AspectRatioMode

how video is scaled with respect to its aspect ratio.

Access functions:

Qt::AspectRatioMode aspectRatioMode() const
void setAspectRatioMode(Qt::AspectRatioMode mode)

brightness : int

This property holds an adjustment to the brightness of displayed video.

Valid brightness values range between -100 and 100, the default is 0.

Access functions:

int brightness() const
void setBrightness(int brightness)

Notifier signal:

void brightnessChanged(int brightness)

contrast : int

This property holds an adjustment to the contrast of displayed video.

Valid contrast values range between -100 and 100, the default is 0.

Access functions:

int contrast() const
void setContrast(int contrast)

Notifier signal:

void contrastChanged(int contrast)

fullScreen : bool

This property holds whether video display is confined to a window or is fullScreen.

Access functions:

bool isFullScreen() const
void setFullScreen(bool fullScreen)

Notifier signal:

void fullScreenChanged(bool fullScreen)

hue : int

This property holds an adjustment to the hue of displayed video.

Valid hue values range between -100 and 100, the default is 0.

Access functions:

int hue() const
void setHue(int hue)

Notifier signal:

void hueChanged(int hue)

mediaObject : QMediaObject* const

This property holds the media object which provides the video displayed by a widget.

Access functions:

virtual QMediaObject *mediaObject() const override

saturation : int

This property holds an adjustment to the saturation of displayed video.

Valid saturation values range between -100 and 100, the default is 0.

Access functions:

int saturation() const
void setSaturation(int saturation)

Notifier signal:

void saturationChanged(int saturation)

Member Function Documentation

QVideoWidget::QVideoWidget(QWidget *parent = nullptr)

Constructs a new video widget.

The parent is passed to QWidget.

[signal] void QVideoWidget::brightnessChanged(int brightness)

Signals that a video widgets's brightness adjustment has changed.

Note: Notifier signal for property brightness.

See also brightness().

[signal] void QVideoWidget::contrastChanged(int contrast)

Signals that a video widgets's contrast adjustment has changed.

Note: Notifier signal for property contrast.

See also contrast().

[signal] void QVideoWidget::fullScreenChanged(bool fullScreen)

Signals that the fullScreen mode of a video widget has changed.

Note: Notifier signal for property fullScreen.

See also isFullScreen().

[signal] void QVideoWidget::hueChanged(int hue)

Signals that a video widgets's hue has changed.

Note: Notifier signal for property hue.

See also hue().

[signal] void QVideoWidget::saturationChanged(int saturation)

Signals that a video widgets's saturation has changed.

Note: Notifier signal for property saturation.

See also saturation().

[virtual] QVideoWidget::~QVideoWidget()

Destroys a video widget.

[override virtual protected] bool QVideoWidget::event(QEvent *event)

Reimplements: QWidget::event(QEvent *event).

Current event event. Returns the value of the baseclass QWidget::event(QEvent *event) function.

[override virtual protected] void QVideoWidget::hideEvent(QHideEvent *event)

Reimplements: QWidget::hideEvent(QHideEvent *event).

Handles the hide event.

[override virtual protected] void QVideoWidget::moveEvent(QMoveEvent *event)

Reimplements: QWidget::moveEvent(QMoveEvent *event).

Handles the move event.

[override virtual protected] void QVideoWidget::paintEvent(QPaintEvent *event)

Reimplements: QWidget::paintEvent(QPaintEvent *event).

Handles the paint event.

[override virtual protected] void QVideoWidget::resizeEvent(QResizeEvent *event)

Reimplements: QWidget::resizeEvent(QResizeEvent *event).

Handles the resize event.

[override virtual protected] void QVideoWidget::showEvent(QShowEvent *event)

Reimplements: QWidget::showEvent(QShowEvent *event).

Handles the show event.

[override virtual] QSize QVideoWidget::sizeHint() const

Reimplements: QWidget::sizeHint() const.

Returns the size hint for the current back end, if there is one, or else the size hint from QWidget.

© 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.