source: trunk/src/declarative/graphicsitems/qdeclarativeanimatedimage.cpp

/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "private/qdeclarativeanimatedimage_p.h"
#include "private/qdeclarativeanimatedimage_p_p.h"

#ifndef QT_NO_MOVIE

#include <qdeclarativeinfo.h>
#include <private/qdeclarativeengine_p.h>

#include <QMovie>
#include <QNetworkRequest>
#include <QNetworkReply>

QT_BEGIN_NAMESPACE

/*!
    \qmlclass AnimatedImage QDeclarativeAnimatedImage
    \inherits Image
    \since 4.7
    \ingroup basic-visual-elements

    The AnimatedImage element extends the features of the \l Image element, providing
    a way to play animations stored as images containing a series of frames,
    such as those stored in GIF files.

    Information about the current frame and totla length of the animation can be
    obtained using the \l currentFrame and \l frameCount properties. You can
    start, pause and stop the animation by changing the values of the \l playing
    and \l paused properties.

    The full list of supported formats can be determined with QMovie::supportedFormats().

    \section1 Example Usage

    \beginfloatleft
    \image animatedimageitem.gif
    \endfloat

    The following QML shows how to display an animated image and obtain information
    about its state, such as the current frame and total number of frames.
    The result is an animated image with a simple progress indicator underneath it.

    \clearfloat
    \snippet doc/src/snippets/declarative/animatedimage.qml document

    \sa BorderImage, Image
*/

QDeclarativeAnimatedImage::QDeclarativeAnimatedImage(QDeclarativeItem *parent)
    : QDeclarativeImage(*(new QDeclarativeAnimatedImagePrivate), parent)
{
}

QDeclarativeAnimatedImage::~QDeclarativeAnimatedImage()
{
    Q_D(QDeclarativeAnimatedImage);
    delete d->_movie;
}

/*!
  \qmlproperty bool AnimatedImage::paused
  This property holds whether the animated image is paused.

  By default, this property is false. Set it to true when you want to pause
  the animation.
*/
bool QDeclarativeAnimatedImage::isPaused() const
{
    Q_D(const QDeclarativeAnimatedImage);
    if(!d->_movie)
        return false;
    return d->_movie->state()==QMovie::Paused;
}

void QDeclarativeAnimatedImage::setPaused(bool pause)
{
    Q_D(QDeclarativeAnimatedImage);
    if(pause == d->paused)
        return;
    d->paused = pause;
    if(!d->_movie)
        return;
    d->_movie->setPaused(pause);
}
/*!
  \qmlproperty bool AnimatedImage::playing
  This property holds whether the animated image is playing.

  By defaults, this property is true, meaning that the animation
  will start playing immediately.
*/
bool QDeclarativeAnimatedImage::isPlaying() const
{
    Q_D(const QDeclarativeAnimatedImage);
    if (!d->_movie)
        return false;
    return d->_movie->state()!=QMovie::NotRunning;
}

void QDeclarativeAnimatedImage::setPlaying(bool play)
{
    Q_D(QDeclarativeAnimatedImage);
    if(play == d->playing)
        return;
    d->playing = play;
    if (!d->_movie)
        return;
    if (play)
        d->_movie->start();
    else
        d->_movie->stop();
}

/*!
  \qmlproperty int AnimatedImage::currentFrame
  \qmlproperty int AnimatedImage::frameCount

  currentFrame is the frame that is currently visible. By monitoring this property
  for changes, you can animate other items at the same time as the image.

  frameCount is the number of frames in the animation. For some animation formats,
  frameCount is unknown and has a value of zero.
*/
int QDeclarativeAnimatedImage::currentFrame() const
{
    Q_D(const QDeclarativeAnimatedImage);
    if (!d->_movie)
        return d->preset_currentframe;
    return d->_movie->currentFrameNumber();
}

void QDeclarativeAnimatedImage::setCurrentFrame(int frame)
{
    Q_D(QDeclarativeAnimatedImage);
    if (!d->_movie) {
        d->preset_currentframe = frame;
        return;
    }
    d->_movie->jumpToFrame(frame);
}

int QDeclarativeAnimatedImage::frameCount() const
{
    Q_D(const QDeclarativeAnimatedImage);
    if (!d->_movie)
        return 0;
    return d->_movie->frameCount();
}

void QDeclarativeAnimatedImage::setSource(const QUrl &url)
{
    Q_D(QDeclarativeAnimatedImage);
    if (url == d->url)
        return;

    delete d->_movie;
    d->_movie = 0;

    if (d->reply) {
        d->reply->deleteLater();
        d->reply = 0;
    }

    d->url = url;

    if (url.isEmpty()) {
        delete d->_movie;
        d->status = Null;
    } else {
#ifndef QT_NO_LOCALFILE_OPTIMIZED_QML
        QString lf = QDeclarativeEnginePrivate::urlToLocalFileOrQrc(url);
        if (!lf.isEmpty()) {
            //### should be unified with movieRequestFinished
            d->_movie = new QMovie(lf);
            if (!d->_movie->isValid()){
                qmlInfo(this) << "Error Reading Animated Image File " << d->url.toString();
                delete d->_movie;
                d->_movie = 0;
                return;
            }
            connect(d->_movie, SIGNAL(stateChanged(QMovie::MovieState)),
                    this, SLOT(playingStatusChanged()));
            connect(d->_movie, SIGNAL(frameChanged(int)),
                    this, SLOT(movieUpdate()));
            d->_movie->setCacheMode(QMovie::CacheAll);
            if(d->playing)
                d->_movie->start();
            else
                d->_movie->jumpToFrame(0);
            if(d->paused)
                d->_movie->setPaused(true);
            d->setPixmap(d->_movie->currentPixmap());
            d->status = Ready;
            d->progress = 1.0;
            emit statusChanged(d->status);
            emit sourceChanged(d->url);
            emit progressChanged(d->progress);
            return;
        }
#endif
        d->status = Loading;
        QNetworkRequest req(d->url);
        req.setAttribute(QNetworkRequest::HttpPipeliningAllowedAttribute, true);
        d->reply = qmlEngine(this)->networkAccessManager()->get(req);
        QObject::connect(d->reply, SIGNAL(finished()),
                         this, SLOT(movieRequestFinished()));
    }

    emit statusChanged(d->status);
}

#define ANIMATEDIMAGE_MAXIMUM_REDIRECT_RECURSION 16

void QDeclarativeAnimatedImage::movieRequestFinished()
{
    Q_D(QDeclarativeAnimatedImage);

    d->redirectCount++;
    if (d->redirectCount < ANIMATEDIMAGE_MAXIMUM_REDIRECT_RECURSION) {
        QVariant redirect = d->reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
        if (redirect.isValid()) {
            QUrl url = d->reply->url().resolved(redirect.toUrl());
            d->reply->deleteLater();
            d->reply = 0;
            setSource(url);
            return;
        }
    }
    d->redirectCount=0;

    d->_movie = new QMovie(d->reply);
    if (!d->_movie->isValid()){
#ifndef QT_NO_DEBUG_STREAM
        qmlInfo(this) << "Error Reading Animated Image File " << d->url;
#endif
        delete d->_movie;
        d->_movie = 0;
        return;
    }
    connect(d->_movie, SIGNAL(stateChanged(QMovie::MovieState)),
            this, SLOT(playingStatusChanged()));
    connect(d->_movie, SIGNAL(frameChanged(int)),
            this, SLOT(movieUpdate()));
    d->_movie->setCacheMode(QMovie::CacheAll);
    if(d->playing)
        d->_movie->start();
    if (d->paused || !d->playing) {
        d->_movie->jumpToFrame(d->preset_currentframe);
        d->preset_currentframe = 0;
    }
    if(d->paused)
        d->_movie->setPaused(true);
    d->setPixmap(d->_movie->currentPixmap());
}

void QDeclarativeAnimatedImage::movieUpdate()
{
    Q_D(QDeclarativeAnimatedImage);
    d->setPixmap(d->_movie->currentPixmap());
    emit frameChanged();
}

void QDeclarativeAnimatedImage::playingStatusChanged()
{
    Q_D(QDeclarativeAnimatedImage);
    if((d->_movie->state() != QMovie::NotRunning) != d->playing){
        d->playing = (d->_movie->state() != QMovie::NotRunning);
        emit playingChanged();
    }
    if((d->_movie->state() == QMovie::Paused) != d->paused){
        d->playing = (d->_movie->state() == QMovie::Paused);
        emit pausedChanged();
    }
}

void QDeclarativeAnimatedImage::componentComplete()
{
    Q_D(QDeclarativeAnimatedImage);
    QDeclarativeItem::componentComplete(); // NOT QDeclarativeImage
    if (!d->reply) {
        setCurrentFrame(d->preset_currentframe);
        d->preset_currentframe = 0;
    }
}

QT_END_NAMESPACE

#endif // QT_NO_MOVIE