#include <qapplication.h>
#include <qfiledialog.h>
#include <qpushbutton.h>
#include <qlabel.h>
#include <qpainter.h>
#include <qmessagebox.h>
#include <qmovie.h>
#include <qvbox.h>
class MovieScreen : public //QFrameThe QFrame class is the base class of widgets that can have a frame. It draws a frame and calls a virtual function, drawContents(), to fill in the frame. This function is reimplemented by subclasses.
{
Q_OBJECT//对于所有定义了信号和槽的类，在类定义开始处的Q_OBJECT宏都是必需的。
QMovie movie;//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.
QString filename;//The QString class provides an abstraction of Unicode text and the classic C '\0'-terminated char array.
QSize sh;//The QSize class defines the size of a two-dimensional object. qsize类定义一个二维对象的大小。
public:
MovieScreen(const char* fname, QMovie m, QWidget* p=0, const char* name=0, WFlags f=0) :
QFrame(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.
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)));
setSizePolicy(QSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding));//大小布局可以拉伸
}
QSize 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.
QPixmap pm = movie.framePixmap();
// Get the area we have to draw in.
QRect r = contentsRect();
if ( !pm.isNull() ) {
// Only rescale is we need to - it can take CPU!
if ( r.size() != pm.size() ) {
QWMatrix m;
m.scale((double)r.width()/pm.width(),
(double)r.height()/pm.height());
pm = pm.xForm(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->drawPixmap(r.x(), r.y(), 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->setFont(QFont("Helvetica", 24));
QFontMetrics fm = p->fontMetrics();
if ( fm.width(message) > r.width()-10 )
p->setFont(QFont("Helvetica", 18));
fm = p->fontMetrics();
if ( fm.width(message) > r.width()-10 )
p->setFont(QFont("Helvetica", 14));
fm = p->fontMetrics();
if ( fm.width(message) > r.width()-10 )
p->setFont(QFont("Helvetica", 12));
fm = p->fontMetrics();
if ( fm.width(message) > r.width()-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()
{
movie.restart();
repaint();
}
void togglePause()
{
if ( movie.paused() )
movie.unpause();
else
movie.pause();
repaint();
}
void step()
{
movie.step();
repaint();
}
void step10()
{
movie.step(10);
repaint();
}
private slots:
void movieUpdated(const QRect& area)
{
if (!isVisible())
show();
// The given area of the movie has changed.
QRect r = contentsRect();
if ( r.size() != movie.framePixmap().size() ) {
// Need to scale - redraw whole frame.
repaint( r );
} else {
// Only redraw the changed area of the frame
repaint( area.x()+r.x(), area.y()+r.x(),
area.width(), area.height() );
}
}
void movieResized(const QSize& size)
{
// The movie changed size, probably from its initial zero size.
int fw = frameWidth();
sh = QSize( size.width() + fw*2, size.height() + fw*2 );
updateGeometry();
if ( parentWidget() && parentWidget()->isHidden() )
parentWidget()->show();
}
void movieStatus(int status)
{
// The movie has sent us a status message.
if (status < 0) {
QString msg;
msg.sprintf("Could not play movie \"%s\"", (const char*)filename);
QMessageBox::warning(this, "movies", msg);
parentWidget()->close();
} else if (status == QMovie::Paused || status == QMovie::EndOfMovie) {
repaint(); // Ensure status text is displayed
}
}
};
class MoviePlayer : public QVBox {
MovieScreen* movie;
public:
MoviePlayer(const char* fname, QMovie m, QWidget* p=0, const char* name=0, WFlags f=0) :
QVBox(p,name,f)
{
movie = new MovieScreen(fname, m, this);
QHBox* hb = new QHBox(this);
QPushButton* btn;
btn = new QPushButton("<<", hb);
connect(btn, SIGNAL(clicked()), movie, SLOT(restart()));
btn = new QPushButton("||", hb);
connect(btn, SIGNAL(clicked()), movie, SLOT(togglePause()));
btn = new QPushButton(">|", hb);
connect(btn, SIGNAL(clicked()), movie, SLOT(step()));
btn = new QPushButton(">>|", hb);
connect(btn, SIGNAL(clicked()), movie, SLOT(step10()));
}
};
// A QFileDialog that chooses movies.
//
class MovieStarter: public QFileDialog {
Q_OBJECT
public:
MovieStarter(const char *dir);
public slots:
void startMovie(const QString& 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 );
};
MovieStarter::MovieStarter(const char *dir)
: QFileDialog(dir, "*.gif *.mng")
{
//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&)));
}
void MovieStarter::startMovie(const QString& filename)
{
if ( filename ) // Start a new movie - have it delete when closed.
(new MoviePlayer( filename, QMovie(filename), 0, 0,
WDestructiveClose))->show();
}
void MovieStarter::done( int r )
{
if (r != Accepted)
qApp->quit(); // end on Cancel
setResult( r );
// And don't hide.
}
int main(int argc, char **argv)
{
QApplication 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::connect(qApp, SIGNAL(lastWindowClosed()), qApp, SLOT(quit()));
} else {
// "GUI" mode - open a chooser for movies
//
MovieStarter* fd = new MovieStarter(".");
fd->show();
}
// Go!
return a.exec();
}
#include "main.moc"
[ 此贴被XChinux在2008-07-18 14:43重新编辑 ]
