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****************************************************************************/

#include "qstylehelper_p.h"

#include <qstyleoption.h>

#include <qpainter.h>

#include <qpixmapcache.h>

#include <private/qmath_p.h>

#include <private/qstyle_p.h>

#include <qmath.h>

#if defined(Q_WS_WIN)

#include "qt_windows.h"

#elif defined(Q_WS_MAC)

#include <private/qt_cocoa_helpers_mac_p.h>

#endif

QT_BEGIN_NAMESPACE

namespace QStyleHelper {

QString uniqueName(const QString &key, const QStyleOption *option, const QSize &size)

{

    const QStyleOptionComplex *complexOption = qstyleoption_cast<const QStyleOptionComplex *>(option);

    QString tmp = QString::fromLatin1("%1-%2-%3-%4-%5-%6x%7").arg(key).arg(uint(option->state)).arg(option->direction)

                   .arg(complexOption ? uint(complexOption->activeSubControls) : uint(0))

                   .arg(option->palette.cacheKey()).arg(size.width()).arg(size.height());

#ifndef QT_NO_SPINBOX

    if (const QStyleOptionSpinBox *spinBox = qstyleoption_cast<const QStyleOptionSpinBox *>(option)) {

        tmp.append(QLatin1Char('-'));

        tmp.append(QString::number(spinBox->buttonSymbols));

        tmp.append(QLatin1Char('-'));

        tmp.append(QString::number(spinBox->stepEnabled));

        tmp.append(QLatin1Char('-'));

        tmp.append(QLatin1Char(spinBox->frame ? '1' : '0'));

    }

#endif // QT_NO_SPINBOX

    return tmp;

}

qreal dpiScaled(qreal value)

{

    static qreal scale = -1;

    if (scale < 0) {

        scale = 1.0;

#if defined(Q_WS_WIN)

        {

            HDC hdcScreen = GetDC(0);

            int dpi = GetDeviceCaps(hdcScreen, LOGPIXELSX);

            ReleaseDC(0, hdcScreen);

            scale = dpi/96.0;

        }

#elif defined(Q_WS_MAC)

    scale = qt_mac_get_scalefactor();

#endif

    }

    return value * scale;

}

#ifndef QT_NO_DIAL

int calcBigLineSize(int radius)

{

    int bigLineSize = radius / 6;

    if (bigLineSize < 4)

        bigLineSize = 4;

    if (bigLineSize > radius / 2)

        bigLineSize = radius / 2;

    return bigLineSize;

}

static QPointF calcRadialPos(const QStyleOptionSlider *dial, qreal offset)

{

    const int width = dial->rect.width();

    const int height = dial->rect.height();

    const int r = qMin(width, height) / 2;

    const int currentSliderPosition = dial->upsideDown ? dial->sliderPosition : (dial->maximum - dial->sliderPosition);

    qreal a = 0;

    if (dial->maximum == dial->minimum)

        a = Q_PI / 2;

    else if (dial->dialWrapping)

        a = Q_PI * 3 / 2 - (currentSliderPosition - dial->minimum) * 2 * Q_PI

            / (dial->maximum - dial->minimum);

    else

        a = (Q_PI * 8 - (currentSliderPosition - dial->minimum) * 10 * Q_PI

            / (dial->maximum - dial->minimum)) / 6;

    qreal xc = width / 2.0;

    qreal yc = height / 2.0;

    qreal len = r - QStyleHelper::calcBigLineSize(r) - 3;

    qreal back = offset * len;

    QPointF pos(QPointF(xc + back * qCos(a), yc - back * qSin(a)));

    return pos;

}

qreal angle(const QPointF &p1, const QPointF &p2)

{

    static const qreal rad_factor = 180 / Q_PI;

    qreal _angle = 0;

    if (p1.x() == p2.x()) {

        if (p1.y() < p2.y())

            _angle = 270;

        else

            _angle = 90;

    } else  {

        qreal x1, x2, y1, y2;

        if (p1.x() <= p2.x()) {

            x1 = p1.x(); y1 = p1.y();

            x2 = p2.x(); y2 = p2.y();

        } else {

            x2 = p1.x(); y2 = p1.y();

            x1 = p2.x(); y1 = p2.y();

        }

        qreal m = -(y2 - y1) / (x2 - x1);

        _angle = qAtan(m) *  rad_factor;

        if (p1.x() < p2.x())

            _angle = 180 - _angle;

        else

            _angle = -_angle;

    }

    return _angle;

}

QPolygonF calcLines(const QStyleOptionSlider *dial)

{

    QPolygonF poly;

    int width = dial->rect.width();

    int height = dial->rect.height();

    qreal r = qMin(width, height) / 2;

    int bigLineSize = calcBigLineSize(int(r));

    qreal xc = width / 2 + 0.5;

    qreal yc = height / 2 + 0.5;

    int ns = dial->tickInterval;

    int notches = (dial->maximum + ns - 1 - dial->minimum) / ns;

    if (notches <= 0)

        return poly;

    if (dial->maximum < dial->minimum || dial->maximum - dial->minimum > 1000) {

        int maximum = dial->minimum + 1000;

        notches = (maximum + ns - 1 - dial->minimum) / ns;

    }

    poly.resize(2 + 2 * notches);

    int smallLineSize = bigLineSize / 2;

    for (int i = 0; i <= notches; ++i) {

        qreal angle = dial->dialWrapping ? Q_PI * 3 / 2 - i * 2 * Q_PI / notches

                  : (Q_PI * 8 - i * 10 * Q_PI / notches) / 6;

        qreal s = qSin(angle);

        qreal c = qCos(angle);

        if (i == 0 || (((ns * i) % (dial->pageStep ? dial->pageStep : 1)) == 0)) {

            poly[2 * i] = QPointF(xc + (r - bigLineSize) * c,

                                  yc - (r - bigLineSize) * s);

            poly[2 * i + 1] = QPointF(xc + r * c, yc - r * s);

        } else {

            poly[2 * i] = QPointF(xc + (r - 1 - smallLineSize) * c,

                                  yc - (r - 1 - smallLineSize) * s);

            poly[2 * i + 1] = QPointF(xc + (r - 1) * c, yc -(r - 1) * s);

        }

    }

    return poly;

}

// This will draw a nice and shiny QDial for us. We don't want

// all the shinyness in QWindowsStyle, hence we place it here

void drawDial(const QStyleOptionSlider *option, QPainter *painter)

{

    QPalette pal = option->palette;

    QColor buttonColor = pal.button().color();

    const int width = option->rect.width();

    const int height = option->rect.height();

    const bool enabled = option->state & QStyle::State_Enabled;

    qreal r = qMin(width, height) / 2;

    r -= r/50;

    const qreal penSize = r/20.0;

    painter->save();

    painter->setRenderHint(QPainter::Antialiasing);

    // Draw notches

    if (option->subControls & QStyle::SC_DialTickmarks) {

        painter->setPen(option->palette.dark().color().darker(120));

        painter->drawLines(QStyleHelper::calcLines(option));

    }

    // Cache dial background

    BEGIN_STYLE_PIXMAPCACHE(QString::fromLatin1("qdial"));

    p->setRenderHint(QPainter::Antialiasing);

    const qreal d_ = r / 6;

    const qreal dx = option->rect.x() + d_ + (width - 2 * r) / 2 + 1;

    const qreal dy = option->rect.y() + d_ + (height - 2 * r) / 2 + 1;

    QRectF br = QRectF(dx + 0.5, dy + 0.5,

                       int(r * 2 - 2 * d_ - 2),

                       int(r * 2 - 2 * d_ - 2));

    buttonColor.setHsv(buttonColor .hue(),

                       qMin(140, buttonColor .saturation()),

                       qMax(180, buttonColor.value()));

    QColor shadowColor(0, 0, 0, 20);

    if (enabled) {

        // Drop shadow

        qreal shadowSize = qMax(1.0, penSize/2.0);

        QRectF shadowRect= br.adjusted(-2*shadowSize, -2*shadowSize,

                                       2*shadowSize, 2*shadowSize);

        QRadialGradient shadowGradient(shadowRect.center().x(),

                                       shadowRect.center().y(), shadowRect.width()/2.0,

                                       shadowRect.center().x(), shadowRect.center().y());

        shadowGradient.setColorAt(qreal(0.91), QColor(0, 0, 0, 40));

        shadowGradient.setColorAt(qreal(1.0), Qt::transparent);

        p->setBrush(shadowGradient);

        p->setPen(Qt::NoPen);

        p->translate(shadowSize, shadowSize);

        p->drawEllipse(shadowRect);

        p->translate(-shadowSize, -shadowSize);

        // Main gradient

        QRadialGradient gradient(br.center().x() - br.width()/3, dy,

                                 br.width()*1.3, br.center().x(),

                                 br.center().y() - br.height()/2);

        gradient.setColorAt(0, buttonColor.lighter(110));

        gradient.setColorAt(qreal(0.5), buttonColor);

        gradient.setColorAt(qreal(0.501), buttonColor.darker(102));

        gradient.setColorAt(1, buttonColor.darker(115));

        p->setBrush(gradient);

    } else {

        p->setBrush(Qt::NoBrush);

    }

    p->setPen(QPen(buttonColor.darker(280)));

    p->drawEllipse(br);

    p->setBrush(Qt::NoBrush);

    p->setPen(buttonColor.lighter(110));

    p->drawEllipse(br.adjusted(1, 1, -1, -1));

    if (option->state & QStyle::State_HasFocus) {

        QColor highlight = pal.highlight().color();

        highlight.setHsv(highlight.hue(),

                         qMin(160, highlight.saturation()),

                         qMax(230, highlight.value()));

        highlight.setAlpha(127);

        p->setPen(QPen(highlight, 2.0));

        p->setBrush(Qt::NoBrush);

        p->drawEllipse(br.adjusted(-1, -1, 1, 1));

    }

    END_STYLE_PIXMAPCACHE

    QPointF dp = calcRadialPos(option, qreal(0.70));

    buttonColor = buttonColor.lighter(104);

    buttonColor.setAlphaF(qreal(0.8));

    const qreal ds = r/qreal(7.0);

    QRectF dialRect(dp.x() - ds, dp.y() - ds, 2*ds, 2*ds);

    QRadialGradient dialGradient(dialRect.center().x() + dialRect.width()/2,

                                 dialRect.center().y() + dialRect.width(),

                                 dialRect.width()*2,

                                 dialRect.center().x(), dialRect.center().y());

    dialGradient.setColorAt(1, buttonColor.darker(140));

    dialGradient.setColorAt(qreal(0.4), buttonColor.darker(120));

    dialGradient.setColorAt(0, buttonColor.darker(110));

    if (penSize > 3.0) {

        painter->setPen(QPen(QColor(0, 0, 0, 25), penSize));

        painter->drawLine(calcRadialPos(option, qreal(0.90)), calcRadialPos(option, qreal(0.96)));

    }

    painter->setBrush(dialGradient);

    painter->setPen(QColor(255, 255, 255, 150));

    painter->drawEllipse(dialRect.adjusted(-1, -1, 1, 1));

    painter->setPen(QColor(0, 0, 0, 80));

    painter->drawEllipse(dialRect);

    painter->restore();

}

#endif //QT_NO_DIAL

void drawBorderPixmap(const QPixmap &pixmap, QPainter *painter, const QRect &rect,

                     int left, int top, int right,

                     int bottom)

{

    QSize size = pixmap.size();

    //painter->setRenderHint(QPainter::SmoothPixmapTransform);

    //top

    if (top > 0) {

        painter->drawPixmap(QRect(rect.left() + left, rect.top(), rect.width() -right - left, top), pixmap,

                            QRect(left, 0, size.width() -right - left, top));

        //top-left

        if(left > 0)

            painter->drawPixmap(QRect(rect.left(), rect.top(), left, top), pixmap,

                                QRect(0, 0, left, top));

        //top-right

        if (right > 0)

            painter->drawPixmap(QRect(rect.left() + rect.width() - right, rect.top(), right, top), pixmap,

                                QRect(size.width() - right, 0, right, top));

    }

    //left

    if (left > 0)

        painter->drawPixmap(QRect(rect.left(), rect.top()+top, left, rect.height() - top - bottom), pixmap,

                            QRect(0, top, left, size.height() - bottom - top));

    //center

    painter->drawPixmap(QRect(rect.left() + left, rect.top()+top, rect.width() -right - left,

                             rect.height() - bottom - top), pixmap,

                       QRect(left, top, size.width() -right -left,

                             size.height() - bottom - top));

    //right

    if (right > 0)

        painter->drawPixmap(QRect(rect.left() +rect.width() - right, rect.top()+top, right, rect.height() - top - bottom), pixmap,

                            QRect(size.width() - right, top, right, size.height() - bottom - top));

    //bottom

    if (bottom > 0) {

        painter->drawPixmap(QRect(rect.left() +left, rect.top() + rect.height() - bottom,

                                 rect.width() - right - left, bottom), pixmap,

                            QRect(left, size.height() - bottom,

                                 size.width() - right - left, bottom));

        //bottom-left

        if (left > 0)

            painter->drawPixmap(QRect(rect.left(), rect.top() + rect.height() - bottom, left, bottom), pixmap,

                                QRect(0, size.height() - bottom, left, bottom));

        //bottom-right

        if (right > 0)

            painter->drawPixmap(QRect(rect.left() + rect.width() - right, rect.top() + rect.height() - bottom, right, bottom), pixmap,

                                QRect(size.width() - right, size.height() - bottom, right, bottom));

    }

}

}

QT_END_NAMESPACE