qdeclarativeimage.cpp

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#include "private/qdeclarativeimage_p.h"
#include "private/qdeclarativeimage_p_p.h"

#include <QKeyEvent>
#include <QPainter>

QT_BEGIN_NAMESPACE


QDeclarativeImage::QDeclarativeImage(QDeclarativeItem *parent)
    : QDeclarativeImageBase(*(new QDeclarativeImagePrivate), parent)
{
}

QDeclarativeImage::QDeclarativeImage(QDeclarativeImagePrivate &dd, QDeclarativeItem *parent)
    : QDeclarativeImageBase(dd, parent)
{
}

QDeclarativeImage::~QDeclarativeImage()
{
}

QPixmap QDeclarativeImage::pixmap() const
{
    Q_D(const QDeclarativeImage);
    return d->pix.pixmap();
}

void QDeclarativeImage::setPixmap(const QPixmap &pix)
{
    Q_D(QDeclarativeImage);
    if (!d->url.isEmpty())
        return;
    d->setPixmap(pix);
}

void QDeclarativeImagePrivate::setPixmap(const QPixmap &pixmap)
{
    Q_Q(QDeclarativeImage);
    pix.setPixmap(pixmap);

    q->pixmapChange();
    status = pix.isNull() ? QDeclarativeImageBase::Null : QDeclarativeImageBase::Ready;

    q->update();
}

QDeclarativeImage::FillMode QDeclarativeImage::fillMode() const
{
    Q_D(const QDeclarativeImage);
    return d->fillMode;
}

void QDeclarativeImage::setFillMode(FillMode mode)
{
    Q_D(QDeclarativeImage);
    if (d->fillMode == mode)
        return;
    d->fillMode = mode;
    update();
    updatePaintedGeometry();
    emit fillModeChanged();
}

qreal QDeclarativeImage::paintedWidth() const
{
    Q_D(const QDeclarativeImage);
    return d->paintedWidth;
}

qreal QDeclarativeImage::paintedHeight() const
{
    Q_D(const QDeclarativeImage);
    return d->paintedHeight;
}

void QDeclarativeImage::updatePaintedGeometry()
{
    Q_D(QDeclarativeImage);

    if (d->fillMode == PreserveAspectFit) {
        if (!d->pix.width() || !d->pix.height()) {
            setImplicitWidth(0);
            setImplicitHeight(0);
            return;
        }
        qreal w = widthValid() ? width() : d->pix.width();
        qreal widthScale = w / qreal(d->pix.width());
        qreal h = heightValid() ? height() : d->pix.height();
        qreal heightScale = h / qreal(d->pix.height());
        if (widthScale <= heightScale) {
            d->paintedWidth = w;
            d->paintedHeight = widthScale * qreal(d->pix.height());
        } else if(heightScale < widthScale) {
            d->paintedWidth = heightScale * qreal(d->pix.width());
            d->paintedHeight = h;
        }
        if (widthValid() && !heightValid()) {
            setImplicitHeight(d->paintedHeight);
        } else {
            setImplicitHeight(d->pix.height());
        }
        if (heightValid() && !widthValid()) {
            setImplicitWidth(d->paintedWidth);
        } else {
            setImplicitWidth(d->pix.width());
        }
    } else if (d->fillMode == PreserveAspectCrop) {
        if (!d->pix.width() || !d->pix.height())
            return;
        qreal widthScale = width() / qreal(d->pix.width());
        qreal heightScale = height() / qreal(d->pix.height());
        if (widthScale < heightScale) {
            widthScale = heightScale;
        } else if(heightScale < widthScale) {
            heightScale = widthScale;
        }

        d->paintedHeight = heightScale * qreal(d->pix.height());
        d->paintedWidth = widthScale * qreal(d->pix.width());
    } else {
        d->paintedWidth = width();
        d->paintedHeight = height();
    }
    emit paintedGeometryChanged();
}

void QDeclarativeImage::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    QDeclarativeImageBase::geometryChanged(newGeometry, oldGeometry);
    updatePaintedGeometry();
}

QRectF QDeclarativeImage::boundingRect() const
{
    Q_D(const QDeclarativeImage);
    return QRectF(0, 0, qMax(d->mWidth, d->paintedWidth), qMax(d->mHeight, d->paintedHeight));
}

void QDeclarativeImage::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *)
{
    Q_D(QDeclarativeImage);
    if (d->pix.pixmap().isNull() )
        return;

    int drawWidth = width();
    int drawHeight = height();
    bool doClip = false;
    QTransform transform;
    qreal widthScale = width() / qreal(d->pix.width());
    qreal heightScale = height() / qreal(d->pix.height());

    if (width() != d->pix.width() || height() != d->pix.height()) {
        if (d->fillMode >= Tile) {
            if (d->fillMode == TileVertically) {
                transform.scale(widthScale, 1.0);
                drawWidth = d->pix.width();
            } else if (d->fillMode == TileHorizontally) {
                transform.scale(1.0, heightScale);
                drawHeight = d->pix.height();
            }
        } else {
            if (d->fillMode == PreserveAspectFit) {
                if (widthScale <= heightScale) {
                    heightScale = widthScale;
                    transform.translate(0, (height() - heightScale * d->pix.height()) / 2);
                } else if(heightScale < widthScale) {
                    widthScale = heightScale;
                    transform.translate((width() - widthScale * d->pix.width()) / 2, 0);
                }
            } else if (d->fillMode == PreserveAspectCrop) {
                if (widthScale < heightScale) {
                    widthScale = heightScale;
                    transform.translate((width() - widthScale * d->pix.width()) / 2, 0);
                } else if(heightScale < widthScale) {
                    heightScale = widthScale;
                    transform.translate(0, (height() - heightScale * d->pix.height()) / 2);
                }
            }
            transform.scale(widthScale, heightScale);
            drawWidth = d->pix.width();
            drawHeight = d->pix.height();
            doClip = clip();
        }
    }

    QTransform oldTransform;
    bool oldAA = p->testRenderHint(QPainter::Antialiasing);
    bool oldSmooth = p->testRenderHint(QPainter::SmoothPixmapTransform);
    if (d->smooth)
        p->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform, d->smooth);
    if (doClip) {
        p->save();
        p->setClipRect(QRectF(0, 0, d->mWidth, d->mHeight), Qt::IntersectClip);
    }
    if (d->mirror)
        transform.translate(drawWidth, 0).scale(-1.0, 1.0);
    if (!transform.isIdentity()) {
        oldTransform = p->transform();
        p->setWorldTransform(transform * oldTransform);
    }

    if (d->fillMode >= Tile)
        p->drawTiledPixmap(QRectF(0, 0, drawWidth, drawHeight), d->pix);
    else
        p->drawPixmap(QRectF(0, 0, drawWidth, drawHeight), d->pix, QRectF(0, 0, drawWidth, drawHeight));

    if (d->smooth) {
        p->setRenderHint(QPainter::Antialiasing, oldAA);
        p->setRenderHint(QPainter::SmoothPixmapTransform, oldSmooth);
    }
    if (doClip)
        p->restore();
    if (!transform.isIdentity())
        p->setWorldTransform(oldTransform);
}

void QDeclarativeImage::pixmapChange()
{
    Q_D(QDeclarativeImage);
    // PreserveAspectFit calculates the implicit size differently so we
    // don't call our superclass pixmapChange(), since that would
    // result in the implicit size being set incorrectly, then updated
    // in updatePaintedGeometry()
    if (d->fillMode != PreserveAspectFit)
        QDeclarativeImageBase::pixmapChange();
    updatePaintedGeometry();
}

QT_END_NAMESPACE