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#include "qstyleanimation_p.h"
#include <qcoreapplication.h>
#include <qprogressbar.h>
#include <qwidget.h>
#include <qevent.h>

QT_BEGIN_NAMESPACE

#ifndef QT_NO_ANIMATION

QStyleAnimation::QStyleAnimation(QObject *target) : QAbstractAnimation(target),
    _startTime(QTime::currentTime())
{
}

QStyleAnimation::~QStyleAnimation()
{
}

int QStyleAnimation::duration() const
{
    return -1;
}

QObject *QStyleAnimation::target() const
{
    return parent();
}

QTime QStyleAnimation::startTime() const
{
    return _startTime;
}

void QStyleAnimation::setStartTime(const QTime &time)
{
    _startTime = time;
}

bool QStyleAnimation::isUpdateNeeded() const
{
    return true;
}

void QStyleAnimation::updateCurrentTime(int)
{
    if (target()->isWidgetType()) {
        QWidget *widget = static_cast<QWidget *>(target());
        if (!widget->isVisible() || widget->window()->isMinimized())
            stop();
    }

    if (isUpdateNeeded()) {
        QEvent event(QEvent::StyleAnimationUpdate);
        QCoreApplication::sendEvent(target(), &event);
    }
}

QProgressStyleAnimation::QProgressStyleAnimation(int speed, QObject *target) :
    QStyleAnimation(target), _speed(speed), _step(-1)
{
}

int QProgressStyleAnimation::animationStep() const
{
    return currentTime() / (1000.0 / _speed);
}

int QProgressStyleAnimation::progressStep(int width) const
{
    int step = animationStep();
    int progress = (step * width / _speed) % width;
    if (((step * width / _speed) % (2 * width)) >= width)
        progress = width - progress;
    return progress;
}

int QProgressStyleAnimation::speed() const
{
    return _speed;
}

void QProgressStyleAnimation::setSpeed(int speed)
{
    _speed = speed;
}

bool QProgressStyleAnimation::isUpdateNeeded() const
{
    QProgressBar *pb = qobject_cast<QProgressBar*>(parent());
    if (pb && pb->minimum() == 0 && pb->maximum() == 0) {
        int current = animationStep();
        if (_step == -1 || _step != current)
        {
            _step = current;
            return true;
        }
    } else {
        // the progress bar is no longer indeterminate -> stop
        const_cast<QProgressStyleAnimation *>(this)->stop();
    }
    return false;
}

#endif // QT_NO_ANIMATION

QT_END_NAMESPACE