LibQQt/qqtgraphicsview.cpp

#include "qqtgraphicsview.h"
#include <QGraphicsItem>
#include <QStyleOptionGraphicsItem>
#include "qqtdefine.h"
#include "qqtgraphicsscene.h"
#include "qqtgui-qt.h"

QQTGraphicsView::QQTGraphicsView(QWidget *parent) :
    QGraphicsView(parent)
{
}


void QQTGraphicsView::paintEvent(QPaintEvent *e)
{
#if 1
    //已经确认，在PC和板子上，这同一套计算代码，都存在问题
    QGraphicsView::paintEvent(e);
    return;
#endif

#if 1
    if(e->type() == QPaintEvent::Paint)
    {
        QPainter p(this->viewport());
        const QRectF rf = rect();
        const QRect rt = sceneRect().toRect();
        //pline() << rt << rf << rect();
          //         pline() << logicalDpiX() << logicalDpiY();
        //pc 96 0.81,0.46 743,593 778，628
        //p.scale(1.5/1, 1.5/1);
        QQTGraphicsScene* sn = (QQTGraphicsScene*)scene();
        sn->render(&p, rf, rt);
    }
    return;
#endif

#if 0
    if (!scene()) {
        QGraphicsView::paintEvent(e);
        return;
    }

    // Set up painter state protection.
    bool painterStateProtection = paintingActive();

    // Determine the exposed region
    QRegion exposedRegion = e->region();
    QRectF exposedSceneRect = mapToScene(exposedRegion.boundingRect()).boundingRect();

    // Set up the painter
    QPainter painter(viewport());


#ifndef QT_NO_RUBBERBAND
    if (RubberBandDrag)
        painter.save();
#endif

    // Set up render hints

    // Set up viewport transform
    const bool viewTransformed = isTransformed();
    if (viewTransformed)
        painter.setWorldTransform(viewportTransform());
    const QTransform viewTransform = painter.worldTransform();

    // Draw background
    if ((cacheMode() & CacheBackground)
#ifdef Q_WS_X11
        && X11->use_xrender
#endif
        ) {
        // Recreate the background pixmap, and flag the whole background as
        // exposed.
        bool mustResizeBackgroundPixmap = true;
        if (mustResizeBackgroundPixmap) {
            QPixmap backgroundPixmap = QPixmap(viewport()->size());
            QBrush bgBrush = viewport()->palette().brush(viewport()->backgroundRole());
            if (!bgBrush.isOpaque())
                d->backgroundPixmap.fill(Qt::transparent);
            QPainter p(&backgroundPixmap);
            p.fillRect(0, 0, d->backgroundPixmap.width(), d->backgroundPixmap.height(), bgBrush);
            d->backgroundPixmapExposed = QRegion(viewport()->rect());
            d->mustResizeBackgroundPixmap = false;
        }

        // Redraw exposed areas
        if (!d->backgroundPixmapExposed.isEmpty()) {
            QPainter backgroundPainter(&d->backgroundPixmap);
            backgroundPainter.setClipRegion(d->backgroundPixmapExposed, Qt::ReplaceClip);
            if (viewTransformed)
                backgroundPainter.setTransform(viewTransform);
            QRectF backgroundExposedSceneRect = mapToScene(d->backgroundPixmapExposed.boundingRect()).boundingRect();
            drawBackground(&backgroundPainter, backgroundExposedSceneRect);
            d->backgroundPixmapExposed = QRegion();
        }

        // Blit the background from the background pixmap
        if (viewTransformed) {
            painter.setWorldTransform(QTransform());
            painter.drawPixmap(QPoint(), d->backgroundPixmap);
            painter.setWorldTransform(viewTransform);
        } else {
            painter.drawPixmap(QPoint(), d->backgroundPixmap);
        }
    } else {
        if (!(d->optimizationFlags & DontSavePainterState))
            painter.save();
        drawBackground(&painter, exposedSceneRect);
        if (!(d->optimizationFlags & DontSavePainterState))
            painter.restore();
    }

    // Items
    if (!(d->optimizationFlags & IndirectPainting)) {
        const quint32 oldRectAdjust = d->scene->d_func()->rectAdjust;
        if (d->optimizationFlags & QGraphicsView::DontAdjustForAntialiasing)
            d->scene->d_func()->rectAdjust = 1;
        else
            d->scene->d_func()->rectAdjust = 2;
        d->scene->d_func()->drawItems(&painter, viewTransformed ? &viewTransform : 0,
                                      &d->exposedRegion, viewport());
        d->scene->d_func()->rectAdjust = oldRectAdjust;
        // Make sure the painter's world transform is restored correctly when
        // drawing without painter state protection (DontSavePainterState).
        // We only change the worldTransform() so there's no need to do a full-blown
        // save() and restore(). Also note that we don't have to do this in case of
        // IndirectPainting (the else branch), because in that case we always save()
        // and restore() in QGraphicsScene::drawItems().
        if (!d->scene->d_func()->painterStateProtection)
            painter.setOpacity(1.0);
        painter.setWorldTransform(viewTransform);
    } else {
        // Make sure we don't have unpolished items before we draw
        if (!d->scene->d_func()->unpolishedItems.isEmpty())
            d->scene->d_func()->_q_polishItems();
        // We reset updateAll here (after we've issued polish events)
        // so that we can discard update requests coming from polishEvent().
        d->scene->d_func()->updateAll = false;

        // Find all exposed items
        bool allItems = false;
        QList<QGraphicsItem *> itemList = d->findItems(d->exposedRegion, &allItems, viewTransform);
        if (!itemList.isEmpty()) {
            // Generate the style options.
            const int numItems = itemList.size();
            QGraphicsItem **itemArray = &itemList[0]; // Relies on QList internals, but is perfectly valid.
            QStyleOptionGraphicsItem *styleOptionArray = d->allocStyleOptionsArray(numItems);
            QTransform transform(Qt::Uninitialized);
            for (int i = 0; i < numItems; ++i) {
                QGraphicsItem *item = itemArray[i];
                QGraphicsItemPrivate *itemd = item->d_ptr.data();
                itemd->initStyleOption(&styleOptionArray[i], viewTransform, d->exposedRegion, allItems);
                // Cache the item's area in view coordinates.
                // Note that we have to do this here in case the base class implementation
                // (QGraphicsScene::drawItems) is not called. If it is, we'll do this
                // operation twice, but that's the price one has to pay for using indirect
                // painting :-/.
                const QRectF brect = adjustedItemEffectiveBoundingRect(item);
                if (!itemd->itemIsUntransformable()) {
                    transform = item->sceneTransform();
                    if (viewTransformed)
                        transform *= viewTransform;
                } else {
                    transform = item->deviceTransform(viewTransform);
                }
                itemd->paintedViewBoundingRects.insert(d->viewport, transform.mapRect(brect).toRect());
            }
            // Draw the items.
            drawItems(&painter, numItems, itemArray, styleOptionArray);
            d->freeStyleOptionsArray(styleOptionArray);
        }
    }

    // Foreground
    drawForeground(&painter, exposedSceneRect);

#ifndef QT_NO_RUBBERBAND
    // Rubberband
    if (d->rubberBanding && !d->rubberBandRect.isEmpty()) {
        painter.restore();
        QStyleOptionRubberBand option;
        option.initFrom(viewport());
        option.rect = d->rubberBandRect;
        option.shape = QRubberBand::Rectangle;

        QStyleHintReturnMask mask;
        if (viewport()->style()->styleHint(QStyle::SH_RubberBand_Mask, &option, viewport(), &mask)) {
            // painter clipping for masked rubberbands
            painter.setClipRegion(mask.region, Qt::IntersectClip);
        }

        viewport()->style()->drawControl(QStyle::CE_RubberBand, &option, &painter, viewport());
    }
#endif

    painter.end();

    // Restore painter state protection.
    d->scene->d_func()->painterStateProtection = true;
#endif

}


void QQTGraphicsView::drawItems(QPainter *painter, int numItems, QGraphicsItem *items[], const QStyleOptionGraphicsItem options[])
{
    for (int i = 0; i < numItems; ++i) {
        // Save painter
        QQTGraphicsItem *item = (QQTGraphicsItem*)items[i];
        if (item->flags() & QGraphicsItem::ItemClipsToShape) {
            painter->setClipPath(item->shape(), Qt::IntersectClip);
        }
        item->paint(painter, &options[i]);
    }
}