Method DocumentView

lib/documentview/documentview.cpp:447–509

};

DocumentView::DocumentView(QGraphicsScene *scene)
    : d(new DocumentViewPrivate)
{
    setFlag(ItemIsFocusable);
    setFlag(ItemIsSelectable);
    setFlag(ItemClipsChildrenToShape);

    d->q = this;
    d->mLoadingIndicator = nullptr;
    d->mBirdEyeView = nullptr;
    d->mCurrent = false;
    d->mCompareMode = false;
    d->controlWheelAccumulatedDelta = 0;
    d->mDragStartPosition = QPointF(0, 0);
    d->mDrag = nullptr;

#ifndef GWENVIEW_NO_WAYLAND_GESTURES
    if (QApplication::platformName() == QStringLiteral("wayland")) {
        d->mWaylandGestures = new WaylandGestures();
        connect(d->mWaylandGestures, &WaylandGestures::pinchGestureStarted, [this]() {
            d->mWaylandGestures->setStartZoom(zoom());
        });
        connect(d->mWaylandGestures, &WaylandGestures::pinchZoomChanged, [this](double zoom) {
            d->setZoom(zoom, d->cursorPosition());
        });
    }
#endif

    d->mTouch = new Touch(this);
    setAcceptTouchEvents(true);
    connect(d->mTouch, &Touch::doubleTapTriggered, this, &DocumentView::toggleFullScreenRequested);
    connect(d->mTouch, &Touch::twoFingerTapTriggered, this, &DocumentView::contextMenuRequested);
    connect(d->mTouch, &Touch::pinchGestureStarted, this, &DocumentView::setPinchParameter);
    connect(d->mTouch, &Touch::pinchZoomTriggered, this, &DocumentView::zoomGesture);
    connect(d->mTouch, &Touch::pinchRotateTriggered, this, &DocumentView::rotationsGesture);
    connect(d->mTouch, &Touch::swipeRightTriggered, this, &DocumentView::swipeRight);
    connect(d->mTouch, &Touch::swipeLeftTriggered, this, &DocumentView::swipeLeft);
    connect(d->mTouch, &Touch::PanTriggered, this, &DocumentView::panGesture);
    connect(d->mTouch, &Touch::tapHoldAndMovingTriggered, this, &DocumentView::startDragFromTouch);

    // We use an opacity effect instead of using the opacity property directly, because the latter operates at
    // the painter level, which means if you draw multiple layers in paint(), all layers get the specified
    // opacity, resulting in all layers being visible when 0 < opacity < 1.
    // QGraphicsEffects on the other hand, operate after all painting is done, therefore 'flattening' all layers.
    // This is important for fade effects, where we don't want any background layers visible during the fade.
    d->mOpacityEffect = new QGraphicsOpacityEffect(this);
    d->mOpacityEffect->setOpacity(0);

    // QTBUG-74963. QGraphicsOpacityEffect cause painting an image as non-highdpi.
    if (qFuzzyCompare(qApp->devicePixelRatio(), 1.0) || QLibraryInfo::version() >= QVersionNumber(5, 12, 4))
        setGraphicsEffect(d->mOpacityEffect);

    scene->addItem(this);

    d->setupHud();
    d->setCurrentAdapter(new EmptyAdapter);

    setAcceptDrops(true);