QGraphicsVideoItem Class
The QGraphicsVideoItem class provides a graphics item which display video produced by a QMediaObject. More...
| Header: | #include <QGraphicsVideoItem> |
| qmake: | QT += multimediawidgets |
| Inherits: | QGraphicsObject and QMediaBindableInterface |
Properties
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Public Functions
| QGraphicsVideoItem(QGraphicsItem *parent = nullptr) | |
| virtual | ~QGraphicsVideoItem() |
| Qt::AspectRatioMode | aspectRatioMode() const |
| QSizeF | nativeSize() const |
| QPointF | offset() const |
| void | setAspectRatioMode(Qt::AspectRatioMode mode) |
| void | setOffset(const QPointF &offset) |
| void | setSize(const QSizeF &size) |
| QSizeF | size() const |
| QAbstractVideoSurface * | videoSurface() const |
Reimplemented Public Functions
| virtual QRectF | boundingRect() const override |
| virtual QMediaObject * | mediaObject() const override |
| virtual void | paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override |
Signals
| void | nativeSizeChanged(const QSizeF &size) |
Detailed Description
Attaching a QGraphicsVideoItem to a QMediaObject allows it to display the video or image output of that media object. A QGraphicsVideoItem is attached to a media object by passing a pointer to the QMediaObject to the setMediaObject() function.
player = new QMediaPlayer(this); QGraphicsVideoItem *item = new QGraphicsVideoItem; player->setVideoOutput(item); graphicsView->scene()->addItem(item); graphicsView->show(); player->setMedia(QUrl("http://example.com/myclip4.ogv")); player->play();
Note: Only a single display output can be attached to a media object at one time.
See also QMediaObject, QMediaPlayer, and QVideoWidget.
Property Documentation
aspectRatioMode : Qt::AspectRatioMode
how a video is scaled to fit the graphics item's size.
Access functions:
| Qt::AspectRatioMode | aspectRatioMode() const |
| void | setAspectRatioMode(Qt::AspectRatioMode mode) |
mediaObject : QMediaObject* const
This property holds the media object which provides the video displayed by a graphics item.
Access functions:
| virtual QMediaObject * | mediaObject() const override |
nativeSize : const QSizeF
This property holds the native size of the video.
Access functions:
| QSizeF | nativeSize() const |
Notifier signal:
| void | nativeSizeChanged(const QSizeF &size) |
offset : QPointF
This property holds the video item's offset.
QGraphicsVideoItem will draw video using the offset for its top left corner.
Access functions:
| QPointF | offset() const |
| void | setOffset(const QPointF &offset) |
size : QSizeF
This property holds the video item's size.
QGraphicsVideoItem will draw video scaled to fit size according to its fillMode.
Access functions:
| QSizeF | size() const |
| void | setSize(const QSizeF &size) |
videoSurface : QAbstractVideoSurface* const
Returns the underlying video surface that can render video frames to the current item. This property is never nullptr. Example of how to render video frames to QGraphicsVideoItem:
QGraphicsVideoItem *item = new QGraphicsVideoItem; graphicsView->scene()->addItem(item); graphicsView->show(); QImage img = QImage("images/qt-logo.png").convertToFormat(QImage::Format_ARGB32); QVideoSurfaceFormat format(img.size(), QVideoFrame::Format_ARGB32); item->videoSurface()->start(format); item->videoSurface()->present(img);
This property was introduced in Qt 5.15.
Access functions:
| QAbstractVideoSurface * | videoSurface() const |
See also QMediaPlayer::setVideoOutput.
Member Function Documentation
QGraphicsVideoItem::QGraphicsVideoItem(QGraphicsItem *parent = nullptr)
Constructs a graphics item that displays video.
The parent is passed to QGraphicsItem.
[signal] void QGraphicsVideoItem::nativeSizeChanged(const QSizeF &size)
Signals that the native size of the video has changed.
Note: Notifier signal for property nativeSize.
[virtual] QGraphicsVideoItem::~QGraphicsVideoItem()
Destroys a video graphics item.
[override virtual] QRectF QGraphicsVideoItem::boundingRect() const
Reimplements: QGraphicsItem::boundingRect() const.
[override virtual] void QGraphicsVideoItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr)
Reimplements: QGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget).