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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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Qt Toolkit - movies/main.cpp example file
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<h1 align=center>Movies<br>Or the Story of the Animated GIF file</h1><br clear="all">
The Movies example displays animated GIF files using the QMovie and
QLabel classes.
<hr>
Main:
<pre>/****************************************************************************
** $Id: qt/examples/movies/main.cpp 2.3.2 edited 2001-06-12 $
**
** Copyright (C) 1992-2000 Trolltech AS. 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 name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>
#include <<a name="qfiledialog.h"></a><a href="qfiledialog-h.html">qfiledialog.h</a>>
#include <<a name="qlabel.h"></a><a href="qlabel-h.html">qlabel.h</a>>
#include <<a name="qpainter.h"></a><a href="qpainter-h.html">qpainter.h</a>>
#include <<a name="qmessagebox.h"></a><a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a name="qmovie.h"></a><a href="qmovie-h.html">qmovie.h</a>>
class MovieScreen : public QFrame {
Q_OBJECT
<a name="QMovie"></a><a href="qmovie.html">QMovie</a> movie;
<a name="QString"></a><a href="qstring.html">QString</a> filename;
public:
MovieScreen(const char* fname, QMovie m, QWidget* p=0, const char* name=0, WFlags f=0) :
<a name="QFrame"></a><a href="qframe.html">QFrame</a>(p, name, f)
{
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.
movie.setBackgroundColor(backgroundColor());
setBackgroundMode(NoBackground);
// Get the movie to tell use when interesting things happen.
movie.connectUpdate(this, SLOT(movieUpdated(const QRect&)));
movie.connectResize(this, SLOT(movieResized(const QSize&)));
movie.connectStatus(this, SLOT(movieStatus(int)));
}
protected:
// Draw the contents of the QFrame - the movie and on-screen-display
void drawContents(<a name="QPainter"></a><a href="qpainter.html">QPainter</a>* p)
{
// Get the current movie frame.
<a name="QPixmap"></a><a href="qpixmap.html">QPixmap</a> pm = movie.framePixmap();
// Get the area we have to draw in.
<a name="QRect"></a><a href="qrect.html">QRect</a> r = contentsRect();
// Only rescale is we need to - it can take CPU!
if ( r.<a name="size"></a><a href="qrect.html#507cd9">size</a>() != pm.<a name="size"></a><a href="qpixmap.html#60b65f">size</a>() ) {
<a name="QWMatrix"></a><a href="qwmatrix.html">QWMatrix</a> m;
m.<a name="scale"></a><a href="qwmatrix.html#41a356">scale</a>((double)r.<a name="width"></a><a href="qrect.html#45fe95">width</a>()/pm.<a name="width"></a><a href="qpixmap.html#86dbc5">width</a>(),
(double)r.<a name="height"></a><a href="qrect.html#581ab8">height</a>()/pm.<a name="height"></a><a href="qpixmap.html#d5bb33">height</a>());
pm = pm.<a name="xForm"></a><a href="qpixmap.html#ff5fcf">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.
//
p-><a name="drawPixmap"></a><a href="qpainter.html#c64b89">drawPixmap</a>(r.<a name="x"></a><a href="qrect.html#fccae7">x</a>(), r.<a name="y"></a><a href="qrect.html#f448f7">y</a>(), pm);
// The on-screen display
const char* message = 0;
if (movie.paused()) {
message = "PAUSED";
} else if (movie.finished()) {
message = "THE END";
} else if (movie.steps() > 0) {
message = "FF >>";
}
if (message) {
// Find a good font size...
p-><a name="setFont"></a><a href="qpainter.html#998df2">setFont</a>(<a name="QFont"></a><a href="qfont.html">QFont</a>("Helvetica", 24));
<a name="QFontMetrics"></a><a href="qfontmetrics.html">QFontMetrics</a> fm = p-><a name="fontMetrics"></a><a href="qpainter.html#73b2e5">fontMetrics</a>();
if ( fm.<a name="width"></a><a href="qfontmetrics.html#3b6f39">width</a>(message) > r.<a href="qrect.html#45fe95">width</a>()-10 )
p-><a href="qpainter.html#998df2">setFont</a>(<a href="qfont.html">QFont</a>("Helvetica", 18));
fm = p-><a href="qpainter.html#73b2e5">fontMetrics</a>();
if ( fm.<a href="qfontmetrics.html#3b6f39">width</a>(message) > r.<a href="qrect.html#45fe95">width</a>()-10 )
p-><a href="qpainter.html#998df2">setFont</a>(<a href="qfont.html">QFont</a>("Helvetica", 14));
fm = p-><a href="qpainter.html#73b2e5">fontMetrics</a>();
if ( fm.<a href="qfontmetrics.html#3b6f39">width</a>(message) > r.<a href="qrect.html#45fe95">width</a>()-10 )
p-><a href="qpainter.html#998df2">setFont</a>(<a href="qfont.html">QFont</a>("Helvetica", 12));
fm = p-><a href="qpainter.html#73b2e5">fontMetrics</a>();
if ( fm.<a href="qfontmetrics.html#3b6f39">width</a>(message) > r.<a href="qrect.html#45fe95">width</a>()-10 )
p-><a href="qpainter.html#998df2">setFont</a>(<a href="qfont.html">QFont</a>("Helvetica", 10));
// "Shadow" effect.
p->setPen(black);
p-><a name="drawText"></a><a href="qpainter.html#0f088f">drawText</a>(1, 1, width()-1, height()-1, AlignCenter, message);
p-><a name="setPen"></a><a href="qpainter.html#0183e4">setPen</a>(white);
p-><a href="qpainter.html#0f088f">drawText</a>(0, 0, width()-1, height()-1, AlignCenter, message);
}
}
void mouseReleaseEvent(<a name="QMouseEvent"></a><a href="qmouseevent.html">QMouseEvent</a>* event)
{
// Do what the Help says...
if (event-><a name="state"></a><a href="qmouseevent.html#db99dc">state</a>() & ShiftButton) {
movie.restart();
} else if (!movie.paused()) {
movie.pause();
} else {
if (event-><a name="button"></a><a href="qmouseevent.html#78482f">button</a>() & LeftButton)
movie.step((event-><a href="qmouseevent.html#db99dc">state</a>() & ControlButton) ? 10 : 1);
else if (event-><a href="qmouseevent.html#78482f">button</a>() & (MidButton|RightButton))
movie.unpause();
}
repaint(); // To hide/show "PAUSED".
}
private slots:
void movieUpdated(const QRect& 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#507cd9">size</a>() != movie.framePixmap().size() ) {
// Need to scale - redraw whole frame.
repaint( r );
} else {
// Only redraw the changed area of the frame
repaint( area.x()+r.<a href="qrect.html#fccae7">x</a>(), area.y()+r.<a href="qrect.html#fccae7">x</a>(),
area.width(), area.height() );
}
}
void movieResized(const QSize& size)
{
// The movie changed size, probably from its initial zero size.
int fw = frameWidth();
resize( size.width() + fw*2, size.height() + fw*2 );
qApp->setMainWidget(this); // Just geometry, etc.
qApp->setMainWidget(0); // Not Close==Quit
}
void movieStatus(int status)
{
// The movie has sent us a status message.
if (status < 0) {
<a href="qstring.html">QString</a> msg;
msg.<a name="sprintf"></a><a href="qstring.html#926f67">sprintf</a>("Could not play movie \"%s\"", (const char*)filename);
<a name="QMessageBox::message"></a><a href="qmessagebox.html#6f1d2d">QMessageBox::message</a>("Error", msg);
} else if (status == QMovie::Paused || status == QMovie::EndOfMovie) {
repaint(); // Ensure status text is displayed
}
}
};
// A QFileDialog that chooses movies.
//
class MovieStarter : public QFileDialog {
Q_OBJECT
public:
MovieStarter(const char *dir) :
<a name="QFileDialog"></a><a href="qfiledialog.html">QFileDialog</a>(dir, "*.gif")
{
//behave as in getOpenFilename
setMode( ExistingFile );
// When a file is selected, show it as a movie.
connect(this, SIGNAL(fileSelected(const QString&)),
this, SLOT(startMovie(const QString&)));
}
public slots:
void startMovie(const QString& filename)
{
if ( filename ) // Start a new movie - have it delete when closed.
(void)new MovieScreen(filename, QMovie(filename), 0, 0, WDestructiveClose);
}
// QDialog's method - normally closes the file dialog.
// We want it left open, and we want Cancel to quit everything.
void done( int r )
{
if (r != Accepted) qApp->quit(); // end on Cancel
setResult( r );
// And don't hide.
}
};
int main(int argc, char **argv)
{
<a name="QApplication"></a><a href="qapplication.html">QApplication</a> a(argc, argv);
if (argc > 1) {
// Commandline mode - show movies given on the command line
//
for (int arg=1; arg<argc; arg++)
(void)new MovieScreen(argv[arg], QMovie(argv[arg]), 0, 0,
Qt::WDestructiveClose);
<a name="QObject::connect"></a><a href="qobject.html#7f8e37">QObject::connect</a>(qApp, SIGNAL(lastWindowClosed()), qApp, SLOT(quit()));
} else {
// "GUI" mode - open a chooser for movies
//
MovieStarter* fd = new MovieStarter(".");
fd-><a name="show"></a><a href="qdialog.html#bfe29c">show</a>();
// Some help text to explain the `hidden' features.
<a name="QLabel"></a><a href="qlabel.html">QLabel</a>* help = new <a href="qlabel.html">QLabel</a>(
"Choose some movies.\n\n"
"Shift-click to Restart.\n"
"Click to Pause,\n"
"then left-click to Step,\n"
"control-left-click to Step 10,\n"
"right-click to Unpause\n\n"
"Windows may be resized to enlarge movie.", 0 );
help-><a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>( "Qt Examples - Movies" );
help-><a name="setIndent"></a><a href="qlabel.html#9077ed">setIndent</a>( 10 );
help-><a name="show"></a><a href="qwidget.html#200ee5">show</a>();
}
// Go!
return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}
#include "main.moc"
</pre>
<p><address><hr><div align="center">
<table width="100%" cellspacing="0" border="0"><tr>
<td>Copyright 2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
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