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

QT_BEGIN_NAMESPACE

QStyleAnimation::QStyleAnimation(QObject *target) : QAbstractAnimation(),
    _delay(0), _duration(-1), _startTime(QTime::currentTime())
{
    if (target) {
        moveToThread(target->thread());
        setParent(target);
    }
    connect(this, SIGNAL(finished()), SLOT(deleteLater()));
}

QStyleAnimation::~QStyleAnimation()
{
}

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

int QStyleAnimation::duration() const
{
    return _duration;
}

void QStyleAnimation::setDuration(int duration)
{
    _duration = duration;
}

int QStyleAnimation::delay() const
{
    return _delay;
}

void QStyleAnimation::setDelay(int delay)
{
    _delay = delay;
}

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

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

void QStyleAnimation::updateTarget()
{
    QEvent event(QEvent::StyleAnimationUpdate);
    QCoreApplication::sendEvent(target(), &event);
}

bool QStyleAnimation::isUpdateNeeded() const
{
    return currentTime() > _delay;
}

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

        if (isUpdateNeeded())
            updateTarget();
    }
}

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
{
    if (QStyleAnimation::isUpdateNeeded()) {
        int current = animationStep();
        if (_step == -1 || _step != current)
        {
            _step = current;
            return true;
        }
    }
    return false;
}

QNumberStyleAnimation::QNumberStyleAnimation(QObject *target) :
    QStyleAnimation(target), _start(0.0), _end(1.0), _prev(0.0)
{
    setDuration(250);
}

qreal QNumberStyleAnimation::startValue() const
{
    return _start;
}

void QNumberStyleAnimation::setStartValue(qreal value)
{
    _start = value;
}

qreal QNumberStyleAnimation::endValue() const
{
    return _end;
}

void QNumberStyleAnimation::setEndValue(qreal value)
{
    _end = value;
}

qreal QNumberStyleAnimation::currentValue() const
{
    qreal step = qreal(currentTime() - delay()) / (duration() - delay());
    return _start + qMax(qreal(0), step) * (_end - _start);
}

bool QNumberStyleAnimation::isUpdateNeeded() const
{
    if (QStyleAnimation::isUpdateNeeded()) {
        qreal current = currentValue();
        if (!qFuzzyCompare(_prev, current))
        {
            _prev = current;
            return true;
        }
    }
    return false;
}

QT_END_NAMESPACE