QGraphicsSceneIndexRectIntersector Class Reference

Inheritance diagram for QGraphicsSceneIndexRectIntersector:

Public Functions
bool	intersect (const QGraphicsItem *item, const QRectF &exposeRect, Qt::ItemSelectionMode mode, const QTransform &deviceTransform) const
Public Functions inherited from QGraphicsSceneIndexIntersector
	QGraphicsSceneIndexIntersector ()
virtual	~QGraphicsSceneIndexIntersector ()

Public Variables
QRectF	sceneRect

Detailed Description

Definition at line 73 of file qgraphicssceneindex.cpp.

Functions

intersect()

bool QGraphicsSceneIndexRectIntersector::intersect ( const QGraphicsItem *  item, const QRectF &  exposeRect, Qt::ItemSelectionMode  mode, const QTransform &  deviceTransform  ) const

inlinevirtual

Implements QGraphicsSceneIndexIntersector.

Definition at line 76 of file qgraphicssceneindex.cpp.

    {
        QRectF brect = item->boundingRect();
        _q_adjustRect(&brect);

        // ### Add test for this (without making things slower?)
        Q_UNUSED(exposeRect);

        bool keep = true;
        const QGraphicsItemPrivate *itemd = QGraphicsItemPrivate::get(item);
        if (itemd->itemIsUntransformable()) {
            // Untransformable items; map the scene rect to item coordinates.
            const QTransform transform = item->deviceTransform(deviceTransform);
            QRectF itemRect = (deviceTransform * transform.inverted()).mapRect(sceneRect);
            if (mode == Qt::ContainsItemShape || mode == Qt::ContainsItemBoundingRect)
                keep = itemRect.contains(brect) && itemRect != brect;
            else
                keep = itemRect.intersects(brect);
            if (keep && (mode == Qt::ContainsItemShape || mode == Qt::IntersectsItemShape)) {
                QPainterPath itemPath;
                itemPath.addRect(itemRect);
                keep = QGraphicsSceneIndexPrivate::itemCollidesWithPath(item, itemPath, mode);
            }
        } else {
            Q_ASSERT(!itemd->dirtySceneTransform);
            const QRectF itemSceneBoundingRect = itemd->sceneTransformTranslateOnly
                                               ? brect.translated(itemd->sceneTransform.dx(),
                                                                  itemd->sceneTransform.dy())
                                               : itemd->sceneTransform.mapRect(brect);
            if (mode == Qt::ContainsItemShape || mode == Qt::ContainsItemBoundingRect)
                keep = sceneRect != brect && sceneRect.contains(itemSceneBoundingRect);
            else
                keep = sceneRect.intersects(itemSceneBoundingRect);
            if (keep && (mode == Qt::ContainsItemShape || mode == Qt::IntersectsItemShape)) {
                QPainterPath rectPath;
                rectPath.addRect(sceneRect);
                if (itemd->sceneTransformTranslateOnly)
                    rectPath.translate(-itemd->sceneTransform.dx(), -itemd->sceneTransform.dy());
                else
                    rectPath = itemd->sceneTransform.inverted().map(rectPath);
                keep = QGraphicsSceneIndexPrivate::itemCollidesWithPath(item, rectPath, mode);
            }
        }
        return keep;
    }

Properties

sceneRect

QRectF QGraphicsSceneIndexRectIntersector::sceneRect

Definition at line 123 of file qgraphicssceneindex.cpp.

Referenced by intersect().

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The documentation for this class was generated from the following file:

• /src/gui/graphicsview/qgraphicssceneindex.cpp