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VideoWidget Class Reference
(Phonon::VideoWidget)
[Phonon module]

The VideoWidget class provides a widget that is used to display video. More...

 #include <Phonon>

Inherits QWidget and MediaNode.

This class was introduced in Qt 4.4.

Public Types

Properties

Public Functions

Public Slots

Protected Functions

Additional Inherited Members


Detailed Description

The VideoWidget class provides a widget that is used to display video.

The VideoWidget class renders the video of a media stream on a QWidget. It is connected to the MediaObject, of which video stream it should render. You connect the two objects using the Phonon::createPath() function.

The widget has some possibilities to manipulate the video stream. You can change the brightness(), hue(), saturation(), and contrast().

The widget can resize the video to fit the widget, the AspectRatio is kept during resizing. It is also possible to go to fullScreen() mode. If you need to know the size of the video, you can call sizeHint() after the video has been loaded (i.e., after the MediaObject leaves the LoadingState).

A typical example of usage follows below:

 MediaObject *media = new MediaObject(parent);
 VideoWidget *vwidget = new VideoWidget(parent);
 Phonon::createPath(media, vwidget);

Author: Matthias Kretz <kretz@kde.org>


Member Type Documentation

enum VideoWidget::AspectRatio

Defines the width:height to be used for the video.

ConstantValueDescription
Phonon::VideoWidget::AspectRatioAuto0Let the decoder find the aspect ratio automatically from the media file (this is the default).
Phonon::VideoWidget::AspectRatioWidget1Fits the video into the widget making the aspect ratio depend solely on the size of the widget. This way the aspect ratio is freely resizeable by the user.
Phonon::VideoWidget::AspectRatio4_32Make width/height == 4/3, which is the old TV size and monitor size (1024/768 == 4/3). (4:3)
Phonon::VideoWidget::AspectRatio16_93Make width/height == 16/9, which is the size of most current media. (16:9)

enum VideoWidget::ScaleMode

The ScaleMode enum describes how to treat aspect ratio during resizing of video.

ConstantValueDescription
Phonon::VideoWidget::FitInView0The video will be fitted to fill the view keeping aspect ratio.
Phonon::VideoWidget::ScaleAndCrop1The video is scaled


Property Documentation

aspectRatio : AspectRatio

Defaults to AspectRatioAuto.

Access functions:

See also AspectRatio.

brightness : qreal

This property holds brightness of the video.

Default is 0. Acceptable values are in range of -1, 1.

Access functions:

contrast : qreal

This property holds the contrast of the video.

Default is 0. Acceptable values are in range of -1, 1.

Access functions:

fullScreen : bool

This property holds whether the video is shown using the complete screen.

The property differs from QWidget::fullScreen in that it is writeable.

By default the widget is not shown in fullScreen.

Warning: When switching the video to fullscreen using setFullScreen your application loses control over the widget that actually shows the video (which is then shown as a toplevel window while your application still uses this widget). If you only need to capture key events the event forwarding done internally should suffice for your needs. If you need to map mouse coordinates or add widgets (that are not overlays) you should probably handle fullscreen yourself.

Access functions:

hue : qreal

This property holds the hue of the video.

Default is 0. Acceptable values are in range of -1, 1.

Access functions:

saturation : qreal

This property holds saturation of the video.

Default is 0. Acceptable values are in range of -1, 1.

Access functions:

scaleMode : ScaleMode

If the size of the widget and the size of the video are not equal. The video will be zoomed to fit the widget. The smaller zoom (AddBarsScaleMode) adds black bars at the left/right or top/bottom to make all of the image visible (default). The bigger zoom (ExpandMode) fills the widget completely, keeping all information in one direction and leaving parts of the image outside of the widget in the other direction.

Access functions:


Member Function Documentation

VideoWidget::VideoWidget ( QWidget * parent = 0 )

Constructs a new video widget with a parent.

VideoWidget::VideoWidget ( VideoWidgetPrivate & d, QWidget * parent )   [protected]

void VideoWidget::enterFullScreen ()   [slot]

Convenience slot, calling setFullScreen(true)

bool VideoWidget::event ( QEvent * )   [virtual protected]

void VideoWidget::exitFullScreen ()   [slot]

Convenience slot, calling setFullScreen(false)

void VideoWidget::mouseMoveEvent ( QMouseEvent * )   [virtual protected]


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Qt 4.4.3