com.trolltech.qt.gui
Class QMovie

java.lang.Object
  com.trolltech.qt.internal.QSignalEmitterInternal
      com.trolltech.qt.QSignalEmitter
          com.trolltech.qt.QtJambiObject
              com.trolltech.qt.core.QObject
                  com.trolltech.qt.gui.QMovie

All Implemented Interfaces:

QtJambiInterface

public class QMovie
extends QObject

The QMovie class is a convenience class for playing movies with QImageReader. First, create a QMovie object by passing either the name of a file or a pointer to a QIODevice containing an animated image format to QMovie's constructor. You can call isValid() to check if the image data is valid, before starting the movie. To start the movie, call start(). QMovie will enter Running state, and emit started() and stateChanged() . To get the current state of the movie, call state().

To display the movie in your application, you can pass your QMovie object to QLabel::setMovie(). Example:

        QLabel label = new QLabel();
        QMovie movie = new QMovie("animations/fire.gif");

        label.setMovie(movie);
        movie.start();

Whenever a new frame is available in the movie, QMovie will emit updated() . If the size of the frame changes, resized() is emitted. You can call currentImage() or currentPixmap() to get a copy of the current frame. When the movie is done, QMovie emits finished() . If any error occurs during playback (i.e, the image file is corrupt), QMovie will emit error() .

You can control the speed of the movie playback by calling setSpeed(), which takes the percentage of the original speed as an argument. Pause the movie by calling setPaused(true). QMovie will then enter Paused state and emit stateChanged() . If you call setPaused(false), QMovie will reenter Running state and start the movie again. To stop the movie, call stop().

Certain animation formats allow you to set the background color. You can call setBackgroundColor() to set the color, or backgroundColor() to retrieve the current background color.

currentFrameNumber() returns the sequence number of the current frame. The first frame in the animation has the sequence number 0. frameCount() returns the total number of frames in the animation, if the image format supports this. You can call loopCount() to get the number of times the movie should loop before finishing. nextFrameDelay() returns the number of milliseconds the current frame should be displayed.

QMovie can be instructed to cache frames of an animation by calling setCacheMode().

Call supportedFormats() for a list of formats that QMovie supports.

See also:

QLabel, QImageReader, and Movie Example.

Nested Class Summary

static class	QMovie.CacheMode This enum describes the different cache modes of QMovie.
static class	QMovie.MovieState This enum describes the different states of QMovie.

Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter

QSignalEmitter.AbstractSignal, QSignalEmitter.PrivateSignal0, QSignalEmitter.PrivateSignal1, QSignalEmitter.PrivateSignal2, QSignalEmitter.PrivateSignal3, QSignalEmitter.PrivateSignal4, QSignalEmitter.PrivateSignal5, QSignalEmitter.PrivateSignal6, QSignalEmitter.PrivateSignal7, QSignalEmitter.PrivateSignal8, QSignalEmitter.PrivateSignal9, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9

Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal

com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal

Field Summary

QSignalEmitter.Signal1	error This signal takes 1 generic argument(s).
QSignalEmitter.Signal0	finished This signal is emitted when the movie has finished.
QSignalEmitter.Signal1	frameChanged This signal takes 1 generic argument(s).
QSignalEmitter.Signal1	resized This signal takes 1 generic argument(s).
QSignalEmitter.Signal0	started This signal is emitted after QMovie::start() has been called, and QMovie has entered QMovie::Running state.
QSignalEmitter.Signal1	stateChanged This signal takes 1 generic argument(s).
QSignalEmitter.Signal1	updated This signal takes 1 generic argument(s).

Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal

currentSender

Constructor Summary

QMovie()
Constructs a QMovie object, passing the parent object to QObject's constructor.

QMovie(QIODevice device)
Constructs a QMovie object.

QMovie(QIODevice device, QByteArray format)
Constructs a QMovie object.

QMovie(QIODevice device, QByteArray format, QObject parent)
Constructs a QMovie object.

QMovie(QObject parent)
Constructs a QMovie object, passing the parent object to QObject's constructor.

QMovie(java.lang.String fileName)
Constructs a QMovie object.

QMovie(java.lang.String fileName, QByteArray format)
Constructs a QMovie object.

QMovie(java.lang.String fileName, QByteArray format, QObject parent)
Constructs a QMovie object.

Method Summary

QColor	backgroundColor() Returns the background color of the movie.
QMovie.CacheMode	cacheMode() This property holds the movie's cache mode.
int	currentFrameNumber() Returns the sequence number of the current frame.
QImage	currentImage() Returns the current frame as a QImage.
QPixmap	currentPixmap() Returns the current frame as a QPixmap.
QIODevice	device() Returns the device QMovie reads image data from.
java.lang.String	fileName() Returns the name of the file that QMovie reads image data from.
QByteArray	format() Returns the format that QMovie uses when decoding image data.
int	frameCount() Returns the number of frames in the movie.
QRect	frameRect() Returns the rect of the last frame.
boolean	isValid() Returns true if the movie is valid (e.g., the image data is readable and the image format is supported); otherwise returns false.
boolean	jumpToFrame(int frameNumber) Jumps to frame number frameNumber.
boolean	jumpToNextFrame() Jumps to the next frame.
int	loopCount() Returns the number of times the movie will loop before it finishes.
int	nextFrameDelay() Returns the number of milliseconds QMovie will wait before updating the next frame in the animation.
QSize	scaledSize() Returns the scaled size of frames.
void	setBackgroundColor(QColor color) For image formats that support it, this function sets the background color to color.
void	setCacheMode(QMovie.CacheMode mode) This property holds the movie's cache mode.
void	setDevice(QIODevice device) Sets the current device to device.
void	setFileName(java.lang.String fileName) Sets the name of the file that QMovie reads image data from, to fileName.
void	setFormat(QByteArray format) Sets the format that QMovie will use when decoding image data, to format.
void	setPaused(boolean paused) If paused is true, QMovie will enter Paused state and emit stateChanged(Paused); otherwise it will enter Running state and emit stateChanged(Running).
void	setScaledSize(QSize size) Sets the scaled frame size to size.
void	setSpeed(int percentSpeed) This property holds the movie's speed.
int	speed() This property holds the movie's speed.
void	start() Starts the movie.
QMovie.MovieState	state() Returns the current state of QMovie.
void	stop() Stops the movie.
static java.util.List	supportedFormats() Returns the list of image formats supported by QMovie.

Methods inherited from class com.trolltech.qt.core.QObject

childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, indexOfProperty, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, properties, property, removeEventFilter, setObjectName, setParent, setProperty, startTimer, timerEvent, toString, userProperty

Methods inherited from class com.trolltech.qt.QtJambiObject

dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr

Methods inherited from class com.trolltech.qt.QSignalEmitter

blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread

Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal

__qt_signalInitialization

Methods inherited from class java.lang.Object

clone, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.trolltech.qt.QtJambiInterface

disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership

Field Detail

error

public final QSignalEmitter.Signal1 error

This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QImageReader$ImageReaderError(named: error)>:

This signal is emitted by QMovie when the error error occurred during playback. QMovie will stop the movie, and enter QMovie::NotRunning state.

finished

public final QSignalEmitter.Signal0 finished

This signal is emitted when the movie has finished.

See also:

QMovie::stop().

frameChanged

public final QSignalEmitter.Signal1 frameChanged

This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Integer(named: frameNumber)>:

This signal is emitted when the frame number has changed to frameNumber. You can call currentImage() or currentPixmap() to get a copy of the frame.

resized

public final QSignalEmitter.Signal1 resized

This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.core.QSize(named: size)>:

This signal is emitted when the current frame has been resized to size. This effect is sometimes used in animations as an alternative to replacing the frame. You can call currentImage() or currentPixmap() to get a copy of the updated frame.

started

public final QSignalEmitter.Signal0 started

This signal is emitted after QMovie::start() has been called, and QMovie has entered QMovie::Running state.

stateChanged

public final QSignalEmitter.Signal1 stateChanged

This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.gui.QMovie$MovieState(named: state)>:

This signal is emitted every time the state of the movie changes. The new state is specified by state.

See also:

QMovie::state().

updated

public final QSignalEmitter.Signal1 updated

This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.core.QRect(named: rect)>:

This signal is emitted when the rect rect in the current frame has been updated. You can call currentImage() or currentPixmap() to get a copy of the updated frame.

Constructor Detail

QMovie

public QMovie(QIODevice device,
              QByteArray format)

Constructs a QMovie object. QMovie will use read image data from device, which it assumes is open and readable. If format is not empty, QMovie will use the image format format for decoding the image data. Otherwise, QMovie will attempt to guess the format.

The parent object is passed to QObject's constructor.

QMovie

public QMovie(QIODevice device)

Constructs a QMovie object. QMovie will use read image data from device, which it assumes is open and readable. If format is not empty, QMovie will use the image format format for decoding the image data. Otherwise, QMovie will attempt to guess the format.

The parent object is passed to QObject's constructor.

QMovie

public QMovie(QIODevice device,
              QByteArray format,
              QObject parent)

Constructs a QMovie object. QMovie will use read image data from device, which it assumes is open and readable. If format is not empty, QMovie will use the image format format for decoding the image data. Otherwise, QMovie will attempt to guess the format.

The parent object is passed to QObject's constructor.

QMovie

public QMovie()

Constructs a QMovie object, passing the parent object to QObject's constructor.

See also:

setFileName(), setDevice(), and setFormat().

QMovie

public QMovie(QObject parent)

Constructs a QMovie object, passing the parent object to QObject's constructor.

See also:

setFileName(), setDevice(), and setFormat().

QMovie

public QMovie(java.lang.String fileName,
              QByteArray format)

Constructs a QMovie object. QMovie will use read image data from fileName. If format is not empty, QMovie will use the image format format for decoding the image data. Otherwise, QMovie will attempt to guess the format.

The parent object is passed to QObject's constructor.

QMovie

public QMovie(java.lang.String fileName)

Constructs a QMovie object. QMovie will use read image data from fileName. If format is not empty, QMovie will use the image format format for decoding the image data. Otherwise, QMovie will attempt to guess the format.

The parent object is passed to QObject's constructor.

QMovie

public QMovie(java.lang.String fileName,
              QByteArray format,
              QObject parent)

Constructs a QMovie object. QMovie will use read image data from fileName. If format is not empty, QMovie will use the image format format for decoding the image data. Otherwise, QMovie will attempt to guess the format.

The parent object is passed to QObject's constructor.

Method Detail

backgroundColor

public final QColor backgroundColor()

Returns the background color of the movie. If no background color has been assigned, an invalid QColor is returned.

See also:

setBackgroundColor().

cacheMode

public final QMovie.CacheMode cacheMode()

This property holds the movie's cache mode. Caching frames can be useful when the underlying animation format handler that QMovie relies on to decode the animation data does not support jumping to particular frames in the animation, or even "rewinding" the animation to the beginning (for looping). Furthermore, if the image data comes from a sequential device, it is not possible for the underlying animation handler to seek back to frames whose data has already been read (making looping altogether impossible).

To aid in such situations, a QMovie object can be instructed to cache the frames, at the added memory cost of keeping the frames in memory for the lifetime of the object.

By default, this property is set to CacheNone .

See also:

QMovie::CacheMode .

currentFrameNumber

public final int currentFrameNumber()

Returns the sequence number of the current frame. The number of the first frame in the movie is 0.

currentImage

public final QImage currentImage()

Returns the current frame as a QImage.

See also:

currentPixmap(), and updated() .

currentPixmap

public final QPixmap currentPixmap()

Returns the current frame as a QPixmap.

See also:

currentImage(), and updated() .

device

public final QIODevice device()

Returns the device QMovie reads image data from. If no device has currently been assigned, 0 is returned.

See also:

setDevice(), and fileName().

fileName

public final java.lang.String fileName()

Returns the name of the file that QMovie reads image data from. If no file name has been assigned, or if the assigned device is not a file, an empty QString is returned.

See also:

setFileName(), and device().

format

public final QByteArray format()

Returns the format that QMovie uses when decoding image data. If no format has been assigned, an empty QByteArray() is returned.

See also:

setFormat().

frameCount

public final int frameCount()

Returns the number of frames in the movie.

Certain animation formats do not support this feature, in which case 0 is returned.

frameRect

public final QRect frameRect()

Returns the rect of the last frame. If no frame has yet been updated, an invalid QRect is returned.

See also:

currentImage(), and currentPixmap().

isValid

public final boolean isValid()

Returns true if the movie is valid (e.g., the image data is readable and the image format is supported); otherwise returns false.

jumpToFrame

public final boolean jumpToFrame(int frameNumber)

Jumps to frame number frameNumber. Returns true on success; otherwise returns false.

jumpToNextFrame

public final boolean jumpToNextFrame()

Jumps to the next frame. Returns true on success; otherwise returns false.

loopCount

public final int loopCount()

Returns the number of times the movie will loop before it finishes. If the movie will only play once (no looping), loopCount returns 0. If the movie loops forever, loopCount returns -1.

Note that, if the image data comes from a sequential device (e.g. a socket), QMovie can only loop the movie if the cacheMode is set to QMovie::CacheAll .

nextFrameDelay

public final int nextFrameDelay()

Returns the number of milliseconds QMovie will wait before updating the next frame in the animation.

scaledSize

public final QSize scaledSize()

Returns the scaled size of frames.

See also:

setScaledSize(), and QImageReader::scaledSize().

setBackgroundColor

public final void setBackgroundColor(QColor color)

For image formats that support it, this function sets the background color to color.

See also:

backgroundColor().

setCacheMode

public final void setCacheMode(QMovie.CacheMode mode)

This property holds the movie's cache mode. Caching frames can be useful when the underlying animation format handler that QMovie relies on to decode the animation data does not support jumping to particular frames in the animation, or even "rewinding" the animation to the beginning (for looping). Furthermore, if the image data comes from a sequential device, it is not possible for the underlying animation handler to seek back to frames whose data has already been read (making looping altogether impossible).

To aid in such situations, a QMovie object can be instructed to cache the frames, at the added memory cost of keeping the frames in memory for the lifetime of the object.

By default, this property is set to CacheNone .

See also:

QMovie::CacheMode .

setDevice

public final void setDevice(QIODevice device)

Sets the current device to device. QMovie will read image data from this device when the movie is running.

See also:

device(), and setFormat().

setFileName

public final void setFileName(java.lang.String fileName)

Sets the name of the file that QMovie reads image data from, to fileName.

See also:

fileName(), setDevice(), and setFormat().

setFormat

public final void setFormat(QByteArray format)

Sets the format that QMovie will use when decoding image data, to format. By default, QMovie will attempt to guess the format of the image data.

You can call supportedFormats() for the full list of formats QMovie supports.

See also:

format(), and QImageReader::supportedImageFormats().

setPaused

public final void setPaused(boolean paused)

If paused is true, QMovie will enter Paused state and emit stateChanged(Paused); otherwise it will enter Running state and emit stateChanged(Running).

See also:

paused(), and state().

setScaledSize

public final void setScaledSize(QSize size)

Sets the scaled frame size to size.

See also:

scaledSize(), and QImageReader::setScaledSize().

setSpeed

public final void setSpeed(int percentSpeed)

This property holds the movie's speed. The speed is measured in percentage of the original movie speed. The default speed is 100%. Example:

        QMovie movie = new QMovie("racecar.gif");
        movie.setSpeed(200); // 2x speed

speed

public final int speed()

This property holds the movie's speed. The speed is measured in percentage of the original movie speed. The default speed is 100%. Example:

        QMovie movie = new QMovie("racecar.gif");
        movie.setSpeed(200); // 2x speed

start

public final void start()

Starts the movie. QMovie will enter Running state, and start emitting updated() and resized() as the movie progresses.

If QMovie is in the Paused state, this function is equivalent to calling setPaused(false). If QMovie is already in the Running state, this function does nothing.

See also:

stop(), and setPaused().

state

public final QMovie.MovieState state()

Returns the current state of QMovie.

See also:

MovieState , and stateChanged() .

stop

public final void stop()

Stops the movie. QMovie enters NotRunning state, and stops emitting updated() and resized() . If start() is called again, the movie will restart from the beginning.

If QMovie is already in the NotRunning state, this function does nothing.

See also:

start(), and setPaused().

supportedFormats

public static java.util.List supportedFormats()

Returns the list of image formats supported by QMovie.

See also:

QImageReader::supportedImageFormats().