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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/movies/movies.doc:4 -->
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<title>Movies or the Story of the Animated GIF file</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Movies or the Story of the Animated GIF file</h1>
<p>
The Movies example displays MNG and animated GIF files using the <a href="qmovie.html">QMovie</a> and
<a href="qlabel.html">QLabel</a> classes.
<p> The movies will only read an animated GIF if GIF reading was enabled when Qt was built.
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qfiledialog-h.html">qfiledialog.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a href="qmovie-h.html">qmovie.h</a>>
#include <<a href="qvbox-h.html">qvbox.h</a>>
class MovieScreen : public <a href="qframe.html">QFrame</a> {
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
<a href="qmovie.html">QMovie</a> movie;
<a href="qstring.html">QString</a> filename;
<a href="qsize.html">QSize</a> sh;
public:
MovieScreen(const char* fname, QMovie m, QWidget* p=0, const char* name=0, WFlags f=0) :
<a href="qframe.html">QFrame</a>(p, name, f),
sh(100,100)
{
setCaption(fname);
filename = fname;
movie = m;
// Set a frame around the movie.
setFrameStyle(QFrame::WinPanel|QFrame::Sunken);
// No background needed, since we draw on the whole widget.
<a name="x523"></a> movie.<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>(backgroundColor());
setBackgroundMode(NoBackground);
// Get the movie to tell use when interesting things happen.
<a name="x500"></a> movie.<a href="qmovie.html#connectUpdate">connectUpdate</a>(this, SLOT(movieUpdated(const <a href="qrect.html">QRect</a>&)));
<a name="x498"></a> movie.<a href="qmovie.html#connectResize">connectResize</a>(this, SLOT(movieResized(const <a href="qsize.html">QSize</a>&)));
<a name="x499"></a> movie.<a href="qmovie.html#connectStatus">connectStatus</a>(this, SLOT(movieStatus(int)));
setSizePolicy(QSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding));
}
<a href="qsize.html">QSize</a> sizeHint() const
{
return sh;
}
protected:
// Draw the contents of the QFrame - the movie and on-screen-display
void drawContents(QPainter* p)
{
// Get the current movie frame.
<a name="x502"></a> <a href="qpixmap.html">QPixmap</a> pm = movie.<a href="qmovie.html#framePixmap">framePixmap</a>();
// Get the area we have to draw in.
<a href="qrect.html">QRect</a> r = contentsRect();
<a name="x511"></a> if ( !pm.<a href="qpixmap.html#isNull">isNull</a>() ) {
// Only rescale is we need to - it can take CPU!
<a name="x516"></a><a name="x512"></a> if ( r.<a href="qrect.html#size">size</a>() != pm.<a href="qpixmap.html#size">size</a>() ) {
<a href="qwmatrix.html">QWMatrix</a> m;
<a name="x524"></a><a name="x517"></a><a name="x513"></a> m.<a href="qwmatrix.html#scale">scale</a>((double)r.<a href="qrect.html#width">width</a>()/pm.<a href="qpixmap.html#width">width</a>(),
<a name="x515"></a><a name="x510"></a> (double)r.<a href="qrect.html#height">height</a>()/pm.<a href="qpixmap.html#height">height</a>());
<a name="x514"></a> pm = pm.<a href="qpixmap.html#xForm">xForm</a>(m);
}
// Draw the [possibly scaled] frame. movieUpdated() below calls
// repaint with only the changed area, so clipping will ensure we
// only do the minimum amount of rendering.
//
<a name="x519"></a><a name="x518"></a> p->drawPixmap(r.<a href="qrect.html#x">x</a>(), r.<a href="qrect.html#y">y</a>(), pm);
}
// The on-screen display
const char* message = 0;
<a name="x504"></a> if (movie.<a href="qmovie.html#paused">paused</a>()) {
message = "PAUSED";
<a name="x501"></a> } else if (movie.<a href="qmovie.html#finished">finished</a>()) {
message = "THE END";
<a name="x507"></a> } else if (movie.<a href="qmovie.html#steps">steps</a>() > 0) {
message = "FF >>";
}
if (message) {
// Find a good font size...
p->setFont(QFont("Helvetica", 24));
<a href="qfontmetrics.html">QFontMetrics</a> fm = p->fontMetrics();
<a name="x496"></a> if ( fm.<a href="qfontmetrics.html#width">width</a>(message) > r.<a href="qrect.html#width">width</a>()-10 )
p->setFont(QFont("Helvetica", 18));
fm = p->fontMetrics();
if ( fm.<a href="qfontmetrics.html#width">width</a>(message) > r.<a href="qrect.html#width">width</a>()-10 )
p->setFont(QFont("Helvetica", 14));
fm = p->fontMetrics();
if ( fm.<a href="qfontmetrics.html#width">width</a>(message) > r.<a href="qrect.html#width">width</a>()-10 )
p->setFont(QFont("Helvetica", 12));
fm = p->fontMetrics();
if ( fm.<a href="qfontmetrics.html#width">width</a>(message) > r.<a href="qrect.html#width">width</a>()-10 )
p->setFont(QFont("Helvetica", 10));
// "Shadow" effect.
p->setPen(black);
p->drawText(1, 1, width()-1, height()-1, AlignCenter, message);
p->setPen(white);
p->drawText(0, 0, width()-1, height()-1, AlignCenter, message);
}
}
public slots:
void restart()
{
<a name="x505"></a> movie.<a href="qmovie.html#restart">restart</a>();
repaint();
}
void togglePause()
{
if ( movie.<a href="qmovie.html#paused">paused</a>() )
<a name="x508"></a> movie.<a href="qmovie.html#unpause">unpause</a>();
else
<a name="x503"></a> movie.<a href="qmovie.html#pause">pause</a>();
repaint();
}
void step()
{
<a name="x506"></a> movie.<a href="qmovie.html#step">step</a>();
repaint();
}
void step10()
{
movie.<a href="qmovie.html#step">step</a>(10);
repaint();
}
private slots:
void movieUpdated(const <a href="qrect.html">QRect</a>& area)
{
if (!isVisible())
show();
// The given area of the movie has changed.
<a href="qrect.html">QRect</a> r = contentsRect();
if ( r.<a href="qrect.html#size">size</a>() != movie.<a href="qmovie.html#framePixmap">framePixmap</a>().size() ) {
// Need to scale - redraw whole frame.
repaint( r );
} else {
// Only redraw the changed area of the frame
repaint( area.<a href="qrect.html#x">x</a>()+r.<a href="qrect.html#x">x</a>(), area.<a href="qrect.html#y">y</a>()+r.<a href="qrect.html#x">x</a>(),
area.<a href="qrect.html#width">width</a>(), area.<a href="qrect.html#height">height</a>() );
}
}
void movieResized(const <a href="qsize.html">QSize</a>& size)
{
// The movie changed size, probably from its initial zero size.
int fw = frameWidth();
<a name="x521"></a><a name="x520"></a> sh = QSize( size.<a href="qsize.html#width">width</a>() + fw*2, size.<a href="qsize.html#height">height</a>() + fw*2 );
<a href="qwidget.html#updateGeometry">updateGeometry</a>();
if ( <a href="qwidget.html#parentWidget">parentWidget</a>() && parentWidget()->isHidden() )
<a href="qwidget.html#parentWidget">parentWidget</a>()->show();
}
void movieStatus(int status)
{
// The movie has sent us a status message.
if (status < 0) {
<a href="qstring.html">QString</a> msg;
msg.<a href="qstring.html#sprintf">sprintf</a>("Could not play movie \"%s\"", (const char*)filename);
QMessageBox::<a href="qmessagebox.html#warning">warning</a>(this, "movies", msg);
<a href="qwidget.html#parentWidget">parentWidget</a>()->close();
} else if (status == QMovie::Paused || status == QMovie::EndOfMovie) {
<a href="qwidget.html#repaint">repaint</a>(); // Ensure status text is displayed
}
}
};
class MoviePlayer : public <a href="qvbox.html">QVBox</a> {
MovieScreen* movie;
public:
MoviePlayer(const char* fname, QMovie m, QWidget* p=0, const char* name=0, WFlags f=0) :
<a href="qvbox.html">QVBox</a>(p,name,f)
{
movie = new MovieScreen(fname, m, this);
<a href="qhbox.html">QHBox</a>* hb = new <a href="qhbox.html">QHBox</a>(this);
<a href="qpushbutton.html">QPushButton</a>* btn;
btn = new <a href="qpushbutton.html">QPushButton</a>("<<", hb);
<a href="qobject.html#connect">connect</a>(btn, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), movie, SLOT(<a href="qmovie.html#restart">restart</a>()));
btn = new <a href="qpushbutton.html">QPushButton</a>("||", hb);
<a href="qobject.html#connect">connect</a>(btn, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), movie, SLOT(togglePause()));
btn = new <a href="qpushbutton.html">QPushButton</a>(">|", hb);
<a href="qobject.html#connect">connect</a>(btn, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), movie, SLOT(<a href="qmovie.html#step">step</a>()));
btn = new <a href="qpushbutton.html">QPushButton</a>(">>|", hb);
<a href="qobject.html#connect">connect</a>(btn, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), movie, SLOT(step10()));
}
};
// A QFileDialog that chooses movies.
//
class MovieStarter: public <a href="qfiledialog.html">QFileDialog</a> {
Q_OBJECT
public:
MovieStarter(const char *dir);
public slots:
void startMovie(const <a href="qstring.html">QString</a>& filename);
// QDialog's method - normally closes the file dialog.
// We want it left open, and we want Cancel to quit everything.
void done( int r );
};
<a name="f258"></a>MovieStarter::MovieStarter(const char *dir)
: <a href="qfiledialog.html">QFileDialog</a>(dir, "*.gif *.mng")
{
//behave as in getOpenFilename
<a href="qfiledialog.html#setMode">setMode</a>( ExistingFile );
// When a file is selected, show it as a movie.
<a href="qobject.html#connect">connect</a>(this, SIGNAL(<a href="qfiledialog.html#fileSelected">fileSelected</a>(const <a href="qstring.html">QString</a>&)),
this, SLOT(startMovie(const <a href="qstring.html">QString</a>&)));
}
void <a name="f259"></a>MovieStarter::startMovie(const <a href="qstring.html">QString</a>& filename)
{
if ( filename ) // Start a new movie - have it delete when closed.
(new MoviePlayer( filename, QMovie(filename), 0, 0,
WDestructiveClose))->show();
}
<a name="x495"></a>void MovieStarter::<a href="qdialog.html#done">done</a>( int r )
{
if (r != Accepted)
qApp-><a href="qapplication.html#quit">quit</a>(); // end on Cancel
<a href="qdialog.html#setResult">setResult</a>( r );
// And don't hide.
}
int main(int argc, char **argv)
{
<a href="qapplication.html">QApplication</a> a(argc, argv);
if (argc > 1) {
// Commandline mode - show movies given on the command line
//
bool gui=TRUE;
for (int arg=1; arg<argc; arg++) {
if ( QString(argv[arg]) == "-i" )
gui = !gui;
else if ( gui )
(void)new MoviePlayer(argv[arg], QMovie(argv[arg]), 0, 0,
Qt::WDestructiveClose);
else
(void)new MovieScreen(argv[arg], QMovie(argv[arg]), 0, 0,
Qt::WDestructiveClose);
}
QObject::<a href="qobject.html#connect">connect</a>(qApp, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()));
} else {
// "GUI" mode - open a chooser for movies
//
MovieStarter* fd = new MovieStarter(".");
<a name="x494"></a> fd-><a href="qdialog.html#show">show</a>();
}
// Go!
return a.<a href="qapplication.html#exec">exec</a>();
}
#include "main.moc"
</pre>
<p>See also <a href="examples.html">Examples</a>.
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