The VideoWidget class provides a widget that is used to display video. 更多...
| 头： | #include <Phonon/VideoWidget> |
| Since: | Qt 4.4 |
| 继承： | QWidget and MediaNode |
| enum | AspectRatio { AspectRatioAuto, AspectRatioWidget, AspectRatio4_3, AspectRatio16_9 } |
| enum | ScaleMode { FitInView, ScaleAndCrop } |
|
|
| VideoWidget (QWidget * parent = 0) | |
| AspectRatio | aspectRatio () const |
| qreal | brightness () const |
| qreal | contrast () const |
| qreal | hue () const |
| qreal | saturation () const |
| ScaleMode | scaleMode () const |
| QImage | snapshot () const |
| void | enterFullScreen () |
| void | exitFullScreen () |
| void | setAspectRatio (AspectRatio) |
| void | setBrightness (qreal value ) |
| void | setContrast (qreal value ) |
| void | setFullScreen (bool fullscreen ) |
| void | setHue (qreal value ) |
| void | setSaturation (qreal value ) |
| void | setScaleMode (ScaleMode) |
| virtual bool | event (QEvent *) |
| virtual void | mouseMoveEvent (QMouseEvent *) |
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 ()，和 contrast ().
Resizing of the video is handled automatically, but you can affect the way the video is resized with the aspectRatio and scaleMode properties. By default, the widget will use the aspect ratio of the video stream itself.
The video widget takes the size of the video when it receives a new video stream (i.e., when a new MediaSource is set on the MediaObject to which it is connected). 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 ).
It is also possible to go to full screen 模式。
A typical example of usage follows below:
MediaObject *media = new MediaObject(parent); VideoWidget *vwidget = new VideoWidget(parent); Phonon::createPath(media, vwidget);
另请参阅 Phonon 模块 .
Defines the width:height to be used for the video.
| 常量 | 值 | 描述 |
|---|---|---|
Phonon::VideoWidget::AspectRatioAuto
|
0
|
Let the decoder find the aspect ratio automatically from the media file (this is the default). |
Phonon::VideoWidget::AspectRatioWidget
|
1
|
Fits 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_3
|
2
|
Make width/height == 4/3, which is the old TV size and monitor size (1024/768 == 4/3). (4:3) |
Phonon::VideoWidget::AspectRatio16_9
|
3
|
Make width/height == 16/9, which is the size of most current media. (16:9) |
The ScaleMode enum describes how to treat aspect ratio during resizing of video.
| 常量 | 值 | 描述 |
|---|---|---|
Phonon::VideoWidget::FitInView
|
0
|
The video will be fitted to fill the view keeping aspect ratio. |
Phonon::VideoWidget::ScaleAndCrop
|
1
|
The video is scaled |
默认为 AspectRatioAuto .
访问函数：
| AspectRatio | aspectRatio () const |
| void | setAspectRatio (AspectRatio) |
另请参阅 AspectRatio .
This property holds brightness of the video.
Default is 0. Acceptable values are in range of -1, 1.
访问函数：
| qreal | brightness () const |
| void | setBrightness (qreal value ) |
This property holds the contrast of the video.
Default is 0. Acceptable values are in range of -1, 1.
访问函数：
| qreal | contrast () const |
| void | setContrast (qreal value ) |
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.
警告： When switching to full screen mode using setFullScreen(), the widget onto which the video is rendered is shown as a top-level window. Key event forwarding is handled by VideoWidget , but if you need to handle other events, e.g., mouse events, you should handle fullscreen mode yourself.
访问函数：
| bool | isFullScreen () const |
| void | setFullScreen (bool fullscreen ) |
This property holds the hue of the video.
Default is 0. Acceptable values are in range of -1, 1.
访问函数：
| qreal | hue () const |
| void | setHue (qreal value ) |
This property holds saturation of the video.
Default is 0. Acceptable values are in range of -1, 1.
访问函数：
| qreal | saturation () const |
| void | setSaturation (qreal value ) |
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.
访问函数：
| ScaleMode | scaleMode () const |
| void | setScaleMode (ScaleMode) |
Constructs a new video widget with the specified parent .
[slot]
void
VideoWidget::
enterFullScreen
()
Convenience slot, calling setFullScreen (true)
[virtual protected]
bool
VideoWidget::
event
(
QEvent
*)
重实现自 QObject::event ().
[slot]
void
VideoWidget::
exitFullScreen
()
Convenience slot, calling setFullScreen (false)
[virtual protected]
void
VideoWidget::
mouseMoveEvent
(
QMouseEvent
*)
重实现自 QWidget::mouseMoveEvent ().
Returns a snapshot of the current frame shown in the widget.
该函数在 Qt 4.7 引入。