qdeclarativerectangle.cpp

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#include "private/qdeclarativerectangle_p.h"
#include "private/qdeclarativerectangle_p_p.h"

#include <QPainter>
#include <QStringBuilder>
#include <QtCore/qmath.h>

QT_BEGIN_NAMESPACE

void QDeclarativePen::setColor(const QColor &c)
{
    _color = c;
    _valid = (_color.alpha() && _width >= 1) ? true : false;
    emit penChanged();
}

void QDeclarativePen::setWidth(int w)
{
    if (_width == w && _valid)
        return;

    _width = w;
    _valid = (_color.alpha() && _width >= 1) ? true : false;
    emit penChanged();
}


void QDeclarativeGradientStop::updateGradient()
{
    if (QDeclarativeGradient *grad = qobject_cast<QDeclarativeGradient*>(parent()))
        grad->doUpdate();
}

const QGradient *QDeclarativeGradient::gradient() const
{
    if (!m_gradient && !m_stops.isEmpty()) {
        m_gradient = new QLinearGradient(0,0,0,1.0);
        for (int i = 0; i < m_stops.count(); ++i) {
            const QDeclarativeGradientStop *stop = m_stops.at(i);
            m_gradient->setCoordinateMode(QGradient::ObjectBoundingMode);
            m_gradient->setColorAt(stop->position(), stop->color());
        }
    }

    return m_gradient;
}

void QDeclarativeGradient::doUpdate()
{
    delete m_gradient;
    m_gradient = 0;
    emit updated();
}


int QDeclarativeRectanglePrivate::doUpdateSlotIdx = -1;

QDeclarativeRectangle::QDeclarativeRectangle(QDeclarativeItem *parent)
  : QDeclarativeItem(*(new QDeclarativeRectanglePrivate), parent)
{
}

void QDeclarativeRectangle::doUpdate()
{
    Q_D(QDeclarativeRectangle);
    d->rectImage = QPixmap();
    const int pw = d->pen && d->pen->isValid() ? d->pen->width() : 0;
    d->setPaintMargin((pw+1)/2);
    update();
}

QDeclarativePen *QDeclarativeRectangle::border()
{
    Q_D(QDeclarativeRectangle);
    return d->getPen();
}

QDeclarativeGradient *QDeclarativeRectangle::gradient() const
{
    Q_D(const QDeclarativeRectangle);
    return d->gradient;
}

void QDeclarativeRectangle::setGradient(QDeclarativeGradient *gradient)
{
    Q_D(QDeclarativeRectangle);
    if (d->gradient == gradient)
        return;
    static int updatedSignalIdx = -1;
    if (updatedSignalIdx < 0)
        updatedSignalIdx = QDeclarativeGradient::staticMetaObject.indexOfSignal("updated()");
    if (d->doUpdateSlotIdx < 0)
        d->doUpdateSlotIdx = QDeclarativeRectangle::staticMetaObject.indexOfSlot("doUpdate()");
    if (d->gradient)
        QMetaObject::disconnect(d->gradient, updatedSignalIdx, this, d->doUpdateSlotIdx);
    d->gradient = gradient;
    if (d->gradient)
        QMetaObject::connect(d->gradient, updatedSignalIdx, this, d->doUpdateSlotIdx);
    update();
}


qreal QDeclarativeRectangle::radius() const
{
    Q_D(const QDeclarativeRectangle);
    return d->radius;
}

void QDeclarativeRectangle::setRadius(qreal radius)
{
    Q_D(QDeclarativeRectangle);
    if (d->radius == radius)
        return;

    d->radius = radius;
    d->rectImage = QPixmap();
    update();
    emit radiusChanged();
}

QColor QDeclarativeRectangle::color() const
{
    Q_D(const QDeclarativeRectangle);
    return d->color;
}

void QDeclarativeRectangle::setColor(const QColor &c)
{
    Q_D(QDeclarativeRectangle);
    if (d->color == c)
        return;

    d->color = c;
    d->rectImage = QPixmap();
    update();
    emit colorChanged();
}

void QDeclarativeRectangle::generateRoundedRect()
{
    Q_D(QDeclarativeRectangle);
    if (d->rectImage.isNull()) {
        const int pw = d->pen && d->pen->isValid() ? d->pen->width() : 0;
        const int radius = qCeil(d->radius);    //ensure odd numbered width/height so we get 1-pixel center

        QString key = QLatin1String("q_") % QString::number(pw) % d->color.name() % QString::number(d->color.alpha(), 16) % QLatin1Char('_') % QString::number(radius);
        if (d->pen && d->pen->isValid())
            key += d->pen->color().name() % QString::number(d->pen->color().alpha(), 16);

        if (!QPixmapCache::find(key, &d->rectImage)) {
            d->rectImage = QPixmap(radius*2 + 3 + pw*2, radius*2 + 3 + pw*2);
            d->rectImage.fill(Qt::transparent);
            QPainter p(&(d->rectImage));
            p.setRenderHint(QPainter::Antialiasing);
            if (d->pen && d->pen->isValid()) {
                QPen pn(QColor(d->pen->color()), d->pen->width());
                p.setPen(pn);
            } else {
                p.setPen(Qt::NoPen);
            }
            p.setBrush(d->color);
            if (pw%2)
                p.drawRoundedRect(QRectF(qreal(pw)/2+1, qreal(pw)/2+1, d->rectImage.width()-(pw+1), d->rectImage.height()-(pw+1)), d->radius, d->radius);
            else
                p.drawRoundedRect(QRectF(qreal(pw)/2, qreal(pw)/2, d->rectImage.width()-pw, d->rectImage.height()-pw), d->radius, d->radius);

            // end painting before inserting pixmap
            // to pixmap cache to avoid a deep copy
            p.end();
            QPixmapCache::insert(key, d->rectImage);
        }
    }
}

void QDeclarativeRectangle::generateBorderedRect()
{
    Q_D(QDeclarativeRectangle);
    if (d->rectImage.isNull()) {
        const int pw = d->pen && d->pen->isValid() ? d->pen->width() : 0;

        QString key = QLatin1String("q_") % QString::number(pw) % d->color.name() % QString::number(d->color.alpha(), 16);
        if (d->pen && d->pen->isValid())
            key += d->pen->color().name() % QString::number(d->pen->color().alpha(), 16);

        if (!QPixmapCache::find(key, &d->rectImage)) {
            // Adding 5 here makes qDrawBorderPixmap() paint correctly with smooth: true
            // See QTBUG-7999 and QTBUG-10765 for more details.
            d->rectImage = QPixmap(pw*2 + 5, pw*2 + 5);
            d->rectImage.fill(Qt::transparent);
            QPainter p(&(d->rectImage));
            p.setRenderHint(QPainter::Antialiasing);
            if (d->pen && d->pen->isValid()) {
                QPen pn(QColor(d->pen->color()), d->pen->width());
                pn.setJoinStyle(Qt::MiterJoin);
                p.setPen(pn);
            } else {
                p.setPen(Qt::NoPen);
            }
            p.setBrush(d->color);
            if (pw%2)
                p.drawRect(QRectF(qreal(pw)/2+1, qreal(pw)/2+1, d->rectImage.width()-(pw+1), d->rectImage.height()-(pw+1)));
            else
                p.drawRect(QRectF(qreal(pw)/2, qreal(pw)/2, d->rectImage.width()-pw, d->rectImage.height()-pw));

            // end painting before inserting pixmap
            // to pixmap cache to avoid a deep copy
            p.end();
            QPixmapCache::insert(key, d->rectImage);
        }
    }
}

void QDeclarativeRectangle::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *)
{
    Q_D(QDeclarativeRectangle);
    if (width() <= 0 || height() <= 0)
        return;
    if (d->radius > 0 || (d->pen && d->pen->isValid())
        || (d->gradient && d->gradient->gradient()) ) {
        drawRect(*p);
    }
    else {
        bool oldAA = p->testRenderHint(QPainter::Antialiasing);
        if (d->smooth)
            p->setRenderHints(QPainter::Antialiasing, true);
        p->fillRect(QRectF(0, 0, width(), height()), d->color);
        if (d->smooth)
            p->setRenderHint(QPainter::Antialiasing, oldAA);
    }
}

void QDeclarativeRectangle::drawRect(QPainter &p)
{
    Q_D(QDeclarativeRectangle);
    if ((d->gradient && d->gradient->gradient())
        || d->radius > width()/2 || d->radius > height()/2
        || width() < 3 || height() < 3) {
        // XXX This path is still slower than the image path
        // Image path won't work for gradients or invalid radius though
        bool oldAA = p.testRenderHint(QPainter::Antialiasing);
        if (d->smooth)
            p.setRenderHint(QPainter::Antialiasing);
        if (d->pen && d->pen->isValid()) {
            QPen pn(QColor(d->pen->color()), d->pen->width());
            pn.setJoinStyle(Qt::MiterJoin);
            p.setPen(pn);
        } else {
            p.setPen(Qt::NoPen);
        }
        if (d->gradient && d->gradient->gradient())
            p.setBrush(*d->gradient->gradient());
        else
            p.setBrush(d->color);
        const int pw = d->pen && d->pen->isValid() ? d->pen->width() : 0;
        QRectF rect;
        if (pw%2)
            rect = QRectF(0.5, 0.5, width()-1, height()-1);
        else
            rect = QRectF(0, 0, width(), height());
        qreal radius = d->radius;
        if (radius > width()/2 || radius > height()/2)
            radius = qMin(width()/2, height()/2);
        if (radius > 0.)
            p.drawRoundedRect(rect, radius, radius);
        else
            p.drawRect(rect);
        if (d->smooth)
            p.setRenderHint(QPainter::Antialiasing, oldAA);
    } else {
        bool oldAA = p.testRenderHint(QPainter::Antialiasing);
        bool oldSmooth = p.testRenderHint(QPainter::SmoothPixmapTransform);
        if (d->smooth)
            p.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform, d->smooth);

        const int pw = d->pen && d->pen->isValid() ? (d->pen->width()+1)/2*2 : 0;

        if (d->radius > 0)
            generateRoundedRect();
        else
            generateBorderedRect();

        int xOffset = (d->rectImage.width()-1)/2;
        int yOffset = (d->rectImage.height()-1)/2;
        Q_ASSERT(d->rectImage.width() == 2*xOffset + 1);
        Q_ASSERT(d->rectImage.height() == 2*yOffset + 1);

        // check whether we've eliminated the center completely
        if (2*xOffset > width()+pw)
            xOffset = (width()+pw)/2;
        if (2*yOffset > height()+pw)
            yOffset = (height()+pw)/2;

        QMargins margins(xOffset, yOffset, xOffset, yOffset);
        QTileRules rules(Qt::StretchTile, Qt::StretchTile);
        //NOTE: even though our item may have qreal-based width and height, qDrawBorderPixmap only supports QRects
        qDrawBorderPixmap(&p, QRect(-pw/2, -pw/2, width()+pw, height()+pw), margins, d->rectImage, d->rectImage.rect(), margins, rules);

        if (d->smooth) {
            p.setRenderHint(QPainter::Antialiasing, oldAA);
            p.setRenderHint(QPainter::SmoothPixmapTransform, oldSmooth);
        }
    }
}

QRectF QDeclarativeRectangle::boundingRect() const
{
    Q_D(const QDeclarativeRectangle);
    return QRectF(-d->paintmargin, -d->paintmargin, d->width()+d->paintmargin*2, d->height()+d->paintmargin*2);
}

QT_END_NAMESPACE