QMovie(3qt)QMovie(3qt)NAME
QMovie - Incremental loading of animations or images, signalling as it
progresses
SYNOPSIS
#include <qmovie.h>
Public Members
QMovie ()
QMovie ( int bufsize )
QMovie ( QDataSource * src, int bufsize = 1024 )
QMovie ( const QString & fileName, int bufsize = 1024 )
QMovie ( QByteArray data, int bufsize = 1024 )
QMovie ( const QMovie & movie )
~QMovie ()
QMovie & operator= ( const QMovie & movie )
int pushSpace () const
void pushData ( const uchar * data, int length )
const QColor & backgroundColor () const
void setBackgroundColor ( const QColor & c )
const QRect & getValidRect () const
const QPixmap & framePixmap () const
const QImage & frameImage () const
bool isNull () const
int frameNumber () const
int steps () const
bool paused () const
bool finished () const
bool running () const
void unpause ()
void pause ()
void step ()
void step ( int steps )
void restart ()
int speed () const
void setSpeed ( int percent )
void connectResize ( QObject * receiver, const char * member )
void disconnectResize ( QObject * receiver, const char * member = 0 )
void connectUpdate ( QObject * receiver, const char * member )
void disconnectUpdate ( QObject * receiver, const char * member = 0 )
enum Status { SourceEmpty = -2, UnrecognizedFormat = -1, Paused = 1,
EndOfFrame = 2, EndOfLoop = 3, EndOfMovie = 4, SpeedChanged = 5 }
void connectStatus ( QObject * receiver, const char * member )
void disconnectStatus ( QObject * receiver, const char * member = 0 )
DESCRIPTION
The QMovie class provides incremental loading of animations or images,
signalling as it progresses.
The simplest way to display a QMovie is to use a QLabel and
QLabel::setMovie().
A QMovie provides a QPixmap as the framePixmap(); connections can be
made via connectResize() and connectUpdate() to receive notification of
size and pixmap changes. All decoding is driven by the normal event-
processing mechanisms.
The movie begins playing as soon as the QMovie is created (actually,
once control returns to the event loop). When the last frame in the
movie has been played, it may loop back to the start if such looping is
defined in the input source.
QMovie objects are explicitly shared. This means that a QMovie copied
from another QMovie will be displaying the same frame at all times. If
one shared movie pauses, all pause. To make independent movies, they
must be constructed separately.
The set of data formats supported by QMovie is determined by the
decoder factories that have been installed; the format of the input is
determined as the input is decoded.
The supported formats are MNG (if Qt is configured with MNG support
enabled) and GIF (if Qt is configured with GIF support enabled, see
qgif.h).
If Qt is configured to support GIF reading, we are required to state
that "The Graphics Interchange Format(c) is the Copyright property of
CompuServe Incorporated. GIF(sm) is a Service Mark property of
CompuServe Incorporated.
Warning: If you are in a country that recognizes software patents and
in which Unisys holds a patent on LZW compression and/or decompression
and you want to use GIF, Unisys may require you to license that
technology. Such countries include Canada, Japan, the USA, France,
Germany, Italy and the UK.
GIF support may be removed completely in a future version of Qt. We
recommend using the MNG or PNG format.
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[Image Omitted]
</center>
See also QLabel::setMovie(), Graphics Classes, Image Processing
Classes, and Multimedia Classes.
Member Type Documentation
QMovie::Status
QMovie::SourceEmpty
QMovie::UnrecognizedFormat
QMovie::Paused
QMovie::EndOfFrame
QMovie::EndOfLoop
QMovie::EndOfMovie
QMovie::SpeedChanged
MEMBER FUNCTION DOCUMENTATIONQMovie::QMovie ()
Constructs a null QMovie. The only interesting thing to do with such a
movie is to assign another movie to it.
See also isNull().
QMovie::QMovie ( int bufsize )
Constructs a QMovie with an external data source. You should later call
pushData() to send incoming animation data to the movie.
The bufsize argument sets the maximum amount of data the movie will
transfer from the data source per event loop. The lower this value, the
better interleaved the movie playback will be with other event
processing, but the slower the overall processing will be.
See also pushData().
QMovie::QMovie ( QDataSource * src, int bufsize = 1024 )
Constructs a QMovie that reads an image sequence from the given data
source, src. The source must be allocated dynamically, because QMovie
will take ownership of it and will destroy it when the movie is
destroyed. The movie starts playing as soon as event processing
continues.
The bufsize argument sets the maximum amount of data the movie will
transfer from the data source per event loop. The lower this value, the
better interleaved the movie playback will be with other event
processing, but the slower the overall processing will be.
QMovie::QMovie ( const QString & fileName, int bufsize = 1024 )
Constructs a QMovie that reads an image sequence from the file,
fileName.
The bufsize argument sets the maximum amount of data the movie will
transfer from the data source per event loop. The lower this value, the
better interleaved the movie playback will be with other event
processing, but the slower the overall processing will be.
QMovie::QMovie ( QByteArray data, int bufsize = 1024 )
Constructs a QMovie that reads an image sequence from the byte array,
data.
The bufsize argument sets the maximum amount of data the movie will
transfer from the data source per event loop. The lower this value, the
better interleaved the movie playback will be with other event
processing, but the slower the overall processing will be.
QMovie::QMovie ( const QMovie & movie )
Constructs a movie that uses the same data as movie movie. QMovies use
explicit sharing, so operations on the copy will affect both.
QMovie::~QMovie ()
Destroys the QMovie. If this is the last reference to the data of the
movie, the data is deallocated.
const QColor & QMovie::backgroundColor () const
Returns the background color of the movie set by setBackgroundColor().
void QMovie::connectResize ( QObject * receiver, const char * member )
Connects the receiver's member of type void member(const QSize&) so
that it is signalled when the movie changes size.
Note that due to the explicit sharing of QMovie objects, these
connections persist until they are explicitly disconnected with
disconnectResize() or until every shared copy of the movie is deleted.
Example: movies/main.cpp.
void QMovie::connectStatus ( QObject * receiver, const char * member )
Connects the receiver's member, of type void member(int) so that it is
signalled when the movie changes status. The status codes are negative
for errors and positive for information.
<center>.nf
</center>
More status messages may be added in the future, so a general test for
errors would test for negative.
Note that due to the explicit sharing of QMovie objects, these
connections persist until they are explicitly disconnected with
disconnectStatus() or until every shared copy of the movie is deleted.
Example: movies/main.cpp.
void QMovie::connectUpdate ( QObject * receiver, const char * member )
Connects the receiver's member of type void member(const QRect&) so
that it is signalled when an area of the framePixmap() has changed
since the previous frame.
Note that due to the explicit sharing of QMovie objects, these
connections persist until they are explicitly disconnected with
disconnectUpdate() or until every shared copy of the movie is deleted.
Example: movies/main.cpp.
void QMovie::disconnectResize ( QObject * receiver, const char * member = 0 )
Disconnects the receiver's member (or all members if member is zero)
that were previously connected by connectResize().
void QMovie::disconnectStatus ( QObject * receiver, const char * member = 0 )
Disconnects the receiver's member (or all members if member is zero)
that were previously connected by connectStatus().
void QMovie::disconnectUpdate ( QObject * receiver, const char * member = 0 )
Disconnects the receiver's member (or all members if \q member is zero)
that were previously connected by connectUpdate().
bool QMovie::finished () const
Returns TRUE if the image is no longer playing: this happens when all
loops of all frames are complete; otherwise returns FALSE.
Example: movies/main.cpp.
const QImage & QMovie::frameImage () const
Returns the current frame of the movie, as a QImage. It is not
generally useful to keep a copy of this image. Also note that you must
not call this function if the movie is finished(), since by then the
image will not be available.
See also framePixmap().
int QMovie::frameNumber () const
Returns the number of times EndOfFrame has been emitted since the start
of the current loop of the movie. Thus, before any EndOfFrame has been
emitted the value will be 0; within slots processing the first signal,
frameNumber() will be 1, and so on.
const QPixmap & QMovie::framePixmap () const
Returns the current frame of the movie, as a QPixmap. It is not
generally useful to keep a copy of this pixmap. It is better to keep a
copy of the QMovie and get the framePixmap() only when needed for
drawing.
See also frameImage().
Example: movies/main.cpp.
const QRect & QMovie::getValidRect () const
Returns the area of the pixmap for which pixels have been generated.
bool QMovie::isNull () const
Returns TRUE if the movie is null; otherwise returns FALSE.
QMovie & QMovie::operator= ( const QMovie & movie )
Makes this movie use the same data as movie movie. QMovies use explicit
sharing.
void QMovie::pause ()
Pauses the progress of the animation.
See also unpause().
Example: movies/main.cpp.
bool QMovie::paused () const
Returns TRUE if the image is paused; otherwise returns FALSE.
Example: movies/main.cpp.
void QMovie::pushData ( const uchar * data, int length )
Pushes length bytes from data into the movie. length must be no more
than the amount returned by pushSpace() since the previous call to
pushData().
int QMovie::pushSpace () const
Returns the maximum amount of data that can currently be pushed into
the movie by a call to pushData(). This is affected by the initial
buffer size, but varies as the movie plays and data is consumed.
void QMovie::restart ()
Rewinds the movie to the beginning. If the movie has not been paused,
it begins playing again.
Example: movies/main.cpp.
bool QMovie::running () const
Returns TRUE if the image is not single-stepping, not paused, and not
finished; otherwise returns FALSE.
void QMovie::setBackgroundColor ( const QColor & c )
Sets the background color of the pixmap to c. If the background color
isValid(), the pixmap will never have a mask because the background
color will be used in transparent regions of the image.
See also backgroundColor().
void QMovie::setSpeed ( int percent )
Sets the movie's play speed as a percentage, to percent. This is a
percentage of the speed dictated by the input data format. The default
is 100 percent.
int QMovie::speed () const
Returns the movie's play speed as a percentage. The default is 100
percent.
See also setSpeed().
void QMovie::step ()
Steps forward 1 frame and then pauses.
Example: movies/main.cpp.
void QMovie::step ( int steps )
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Steps forward, showing steps frames, and then pauses.
int QMovie::steps () const
Returns the number of steps remaining after a call to step(). If the
movie is paused, steps() returns 0. If it's running normally or is
finished, steps() returns a negative number.
Example: movies/main.cpp.
void QMovie::unpause ()
Unpauses the progress of the animation.
See also pause().
Example: movies/main.cpp.
SEE ALSO
http://doc.trolltech.com/qmovie.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
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help you. Thank you.
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If you find errors in this manual page, please report them to qt-
bugs@trolltech.com. Please include the name of the manual page
(qmovie.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QMovie(3qt)