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Diffstat (limited to 'src/gui/graphicsview/qgraphicssceneindex.cpp')
| -rw-r--r-- | src/gui/graphicsview/qgraphicssceneindex.cpp | 639 |
1 files changed, 639 insertions, 0 deletions
diff --git a/src/gui/graphicsview/qgraphicssceneindex.cpp b/src/gui/graphicsview/qgraphicssceneindex.cpp new file mode 100644 index 0000000..6895911 --- /dev/null +++ b/src/gui/graphicsview/qgraphicssceneindex.cpp @@ -0,0 +1,639 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qgraphicssceneindex.h" +#include "qgraphicssceneindex_p.h" +#include "qgraphicsscenebsptreeindex_p_p.h" +#include "qgraphicsscene.h" +#include "qgraphicsitem_p.h" +#include "qgraphicsscene_p.h" + +#ifndef QT_NO_GRAPHICSVIEW + +QT_BEGIN_NAMESPACE + +/*! + Constructs a private scene index. +*/ +QGraphicsSceneIndexPrivate::QGraphicsSceneIndexPrivate(QGraphicsScene *scene) : scene(scene) +{ +} + +void QGraphicsSceneIndexPrivate::childItems_helper(QList<QGraphicsItem *> *items, + const QGraphicsItem *parent, + const QPointF &pos) const +{ + bool parentClip = (parent->flags() & QGraphicsItem::ItemClipsChildrenToShape); + if (parentClip && parent->d_ptr->isClippedAway()) + return; + // ### is this needed? + if (parentClip && !parent->boundingRect().contains(pos)) + return; + + QList<QGraphicsItem *> &children = parent->d_ptr->children; + for (int i = 0; i < children.size(); ++i) { + QGraphicsItem *item = children.at(i); + if (item->d_ptr->transformData && !item->d_ptr->transformData->computedFullTransform().isInvertible()) + continue; + + // Skip invisible items and all their children. + if (item->d_ptr->isInvisible()) + continue; + + bool keep = false; + if (!item->d_ptr->isClippedAway()) { + if (item->contains(item->mapFromParent(pos))) { + items->append(item); + keep = true; + } + } + + if ((keep || !(item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) && !item->d_ptr->children.isEmpty()) + // Recurse into children. + childItems_helper(items, item, item->mapFromParent(pos)); + } +} + + +void QGraphicsSceneIndexPrivate::childItems_helper(QList<QGraphicsItem *> *items, + const QGraphicsItem *parent, + const QRectF &rect, + Qt::ItemSelectionMode mode) const +{ + bool parentClip = (parent->flags() & QGraphicsItem::ItemClipsChildrenToShape); + if (parentClip && parent->d_ptr->isClippedAway()) + return; + QRectF adjustedRect(rect); + _q_adjustRect(&adjustedRect); + QRectF r = !parentClip ? adjustedRect : adjustedRect.intersected(adjustedItemBoundingRect(parent)); + if (r.isEmpty()) + return; + + QPainterPath path; + QList<QGraphicsItem *> &children = parent->d_ptr->children; + for (int i = 0; i < children.size(); ++i) { + QGraphicsItem *item = children.at(i); + if (item->d_ptr->transformData && !item->d_ptr->transformData->computedFullTransform().isInvertible()) + continue; + + // Skip invisible items and all their children. + if (item->d_ptr->isInvisible()) + continue; + + bool keep = false; + if (!item->d_ptr->isClippedAway()) { + // ### _q_adjustedRect is only needed because QRectF::intersects, + // QRectF::contains and QTransform::map() and friends don't work with + // flat rectangles. + const QRectF br(adjustedItemBoundingRect(item)); + QRectF mbr = item->mapRectToParent(br); + if (mode >= Qt::ContainsItemBoundingRect) { + // Rect intersects/contains item's bounding rect + if ((mode == Qt::IntersectsItemBoundingRect && QRectF_intersects(rect, mbr)) + || (mode == Qt::ContainsItemBoundingRect && rect != mbr && rect.contains(br))) { + items->append(item); + keep = true; + } + } else { + // Rect intersects/contains item's shape + if (QRectF_intersects(rect, mbr)) { + if (path == QPainterPath()) + path.addRect(rect); + if (scene->d_func()->itemCollidesWithPath(item, item->mapFromParent(path), mode)) { + items->append(item); + keep = true; + } + } + } + } + + if ((keep || !(item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) && !item->d_ptr->children.isEmpty()) { + // Recurse into children. + if (!item->d_ptr->transformData || item->d_ptr->transformData->computedFullTransform().type() <= QTransform::TxScale) { + // Rect + childItems_helper(items, item, item->mapRectFromParent(rect), mode); + } else { + // Polygon + childItems_helper(items, item, item->mapFromParent(rect), mode); + } + } + } +} + + +void QGraphicsSceneIndexPrivate::childItems_helper(QList<QGraphicsItem *> *items, + const QGraphicsItem *parent, + const QPolygonF &polygon, + Qt::ItemSelectionMode mode) const +{ + bool parentClip = (parent->flags() & QGraphicsItem::ItemClipsChildrenToShape); + if (parentClip && parent->d_ptr->isClippedAway()) + return; + QRectF polyRect(polygon.boundingRect()); + _q_adjustRect(&polyRect); + QRectF r = !parentClip ? polyRect : polyRect.intersected(adjustedItemBoundingRect(parent)); + if (r.isEmpty()) + return; + + QPainterPath path; + QList<QGraphicsItem *> &children = parent->d_ptr->children; + for (int i = 0; i < children.size(); ++i) { + QGraphicsItem *item = children.at(i); + if (item->d_ptr->transformData && !item->d_ptr->transformData->computedFullTransform().isInvertible()) + continue; + + // Skip invisible items. + if (item->d_ptr->isInvisible()) + continue; + + bool keep = false; + if (!item->d_ptr->isClippedAway()) { + // ### _q_adjustedRect is only needed because QRectF::intersects, + // QRectF::contains and QTransform::map() and friends don't work with + // flat rectangles. + const QRectF br(adjustedItemBoundingRect(item)); + if (mode >= Qt::ContainsItemBoundingRect) { + // Polygon contains/intersects item's bounding rect + if (path == QPainterPath()) + path.addPolygon(polygon); + if ((mode == Qt::IntersectsItemBoundingRect && path.intersects(item->mapRectToParent(br))) + || (mode == Qt::ContainsItemBoundingRect && path.contains(item->mapRectToParent(br)))) { + items->append(item); + keep = true; + } + } else { + // Polygon contains/intersects item's shape + if (QRectF_intersects(polyRect, item->mapRectToParent(br))) { + if (path == QPainterPath()) + path.addPolygon(polygon); + if (scene->d_func()->itemCollidesWithPath(item, item->mapFromParent(path), mode)) { + items->append(item); + keep = true; + } + } + } + } + + if ((keep || !(item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) && !item->d_ptr->children.isEmpty()) { + // Recurse into children that clip children. + childItems_helper(items, item, item->mapFromParent(polygon), mode); + } + } +} + +void QGraphicsSceneIndexPrivate::childItems_helper(QList<QGraphicsItem *> *items, + const QGraphicsItem *parent, + const QPainterPath &path, + Qt::ItemSelectionMode mode) const +{ + bool parentClip = (parent->flags() & QGraphicsItem::ItemClipsChildrenToShape); + if (parentClip && parent->d_ptr->isClippedAway()) + return; + QRectF pathRect(path.boundingRect()); + _q_adjustRect(&pathRect); + QRectF r = !parentClip ? pathRect : pathRect.intersected(adjustedItemBoundingRect(parent)); + if (r.isEmpty()) + return; + + QList<QGraphicsItem *> &children = parent->d_ptr->children; + for (int i = 0; i < children.size(); ++i) { + QGraphicsItem *item = children.at(i); + if (item->d_ptr->transformData && !item->d_ptr->transformData->computedFullTransform().isInvertible()) + continue; + + // Skip invisible items. + if (item->d_ptr->isInvisible()) + continue; + + bool keep = false; + if (!item->d_ptr->isClippedAway()) { + // ### _q_adjustedRect is only needed because QRectF::intersects, + // QRectF::contains and QTransform::map() and friends don't work with + // flat rectangles. + const QRectF br(adjustedItemBoundingRect(item)); + if (mode >= Qt::ContainsItemBoundingRect) { + // Polygon contains/intersects item's bounding rect + if ((mode == Qt::IntersectsItemBoundingRect && path.intersects(item->mapRectToParent(br))) + || (mode == Qt::ContainsItemBoundingRect && path.contains(item->mapRectToParent(br)))) { + items->append(item); + keep = true; + } + } else { + // Path contains/intersects item's shape + if (QRectF_intersects(pathRect, item->mapRectToParent(br))) { + if (scene->d_func()->itemCollidesWithPath(item, item->mapFromParent(path), mode)) { + items->append(item); + keep = true; + } + } + } + } + + if ((keep || !(item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) && !item->d_ptr->children.isEmpty()) { + // Recurse into children that clip children. + childItems_helper(items, item, item->mapFromParent(path), mode); + } + } +} + +/*! + Constructs an abstract scene index. +*/ +QGraphicsSceneIndex::QGraphicsSceneIndex(QGraphicsScene *scene) +: QObject(*new QGraphicsSceneIndexPrivate(scene), scene) +{ +} + +/*! + \internal +*/ +QGraphicsSceneIndex::QGraphicsSceneIndex(QObjectPrivate &dd, QGraphicsScene *scene) + : QObject(dd, scene) +{ +} + +/*! + Destroys the scene index. +*/ +QGraphicsSceneIndex::~QGraphicsSceneIndex() +{ + +} + +/*! + Returns the scene of this index. +*/ +QGraphicsScene* QGraphicsSceneIndex::scene() const +{ + Q_D(const QGraphicsSceneIndex); + return d->scene; +} + +/*! + Returns the indexed area for the index +*/ +QRectF QGraphicsSceneIndex::indexedRect() const +{ + Q_D(const QGraphicsSceneIndex); + return d->scene->d_func()->sceneRect; +} + +/*! + \fn QList<QGraphicsItem *> items() const = 0 + + This pure virtual function return the list of items that are actually in the index. + +*/ + +QList<QGraphicsItem *> QGraphicsSceneIndex::items(const QPointF &pos, Qt::ItemSelectionMode mode, Qt::SortOrder order, const QTransform &deviceTransform) const +{ + Q_D(const QGraphicsSceneIndex); + QList<QGraphicsItem *> items; + + // The index returns a rough estimate of what items are inside the rect. + // Refine it by iterating through all returned items. + QRectF adjustedRect = QRectF(pos, QSize(1,1)); + foreach (QGraphicsItem *item, estimateItems(adjustedRect, order, deviceTransform)) { + // Find the item's scene transform in a clever way. + QTransform x = item->sceneTransform(); + bool keep = false; + + // ### _q_adjustedRect is only needed because QRectF::intersects, + // QRectF::contains and QTransform::map() and friends don't work with + // flat rectangles. + const QRectF br(adjustedItemBoundingRect(item)); + // Rect intersects/contains item's shape + if (QRectF_intersects(adjustedRect, x.mapRect(br))) { + bool ok; + QTransform xinv = x.inverted(&ok); + if (ok) { + if (item->contains(xinv.map(pos))) { + items << item; + keep = true; + } + } + } + + if (keep && (item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) { + // Recurse into children that clip children. + bool ok; + QTransform xinv = x.inverted(&ok); + if (ok) + d->childItems_helper(&items, item, xinv.map(pos)); + } + } + //### Needed but it should be handle differently + if (order != Qt::SortOrder(-1)) + QGraphicsSceneBspTreeIndexPrivate::sortItems(&items, order, false); + return items; +} + +QList<QGraphicsItem *> QGraphicsSceneIndex::items(const QRectF &rect, Qt::ItemSelectionMode mode, Qt::SortOrder order, const QTransform &deviceTransform) const +{ + Q_D(const QGraphicsSceneIndex); + QList<QGraphicsItem *> items; + + QPainterPath path; + + // The index returns a rough estimate of what items are inside the rect. + // Refine it by iterating through all returned items. + QRectF adjustedRect(rect); + _q_adjustRect(&adjustedRect); + foreach (QGraphicsItem *item, estimateItems(adjustedRect, order, deviceTransform)) { + // Find the item's scene transform in a clever way. + QTransform x = item->sceneTransform(); + bool keep = false; + + // ### _q_adjustedRect is only needed because QRectF::intersects, + // QRectF::contains and QTransform::map() and friends don't work with + // flat rectangles. + const QRectF br(adjustedItemBoundingRect(item)); + if (mode >= Qt::ContainsItemBoundingRect) { + // Rect intersects/contains item's bounding rect + QRectF mbr = x.mapRect(br); + if ((mode == Qt::IntersectsItemBoundingRect && QRectF_intersects(rect, mbr)) + || (mode == Qt::ContainsItemBoundingRect && rect != mbr && rect.contains(mbr))) { + items << item; + keep = true; + } + } else { + // Rect intersects/contains item's shape + if (QRectF_intersects(adjustedRect, x.mapRect(br))) { + bool ok; + QTransform xinv = x.inverted(&ok); + if (ok) { + if (path.isEmpty()) + path.addRect(rect); + if (d->scene->d_func()->itemCollidesWithPath(item, xinv.map(path), mode)) { + items << item; + keep = true; + } + } + } + } + + if (keep && (item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) { + // Recurse into children that clip children. + bool ok; + QTransform xinv = x.inverted(&ok); + if (ok) { + if (x.type() <= QTransform::TxScale) { + // Rect + d->childItems_helper(&items, item, xinv.mapRect(rect), mode); + } else { + // Polygon + d->childItems_helper(&items, item, xinv.map(rect), mode); + } + } + } + } + //### Needed but it should be handle differently + if (order != Qt::SortOrder(-1)) + QGraphicsSceneBspTreeIndexPrivate::sortItems(&items, order, false); + return items; +} + +QList<QGraphicsItem *> QGraphicsSceneIndex::items(const QPolygonF &polygon, Qt::ItemSelectionMode mode, Qt::SortOrder order, const QTransform &deviceTransform) const +{ + Q_D(const QGraphicsSceneIndex); + QList<QGraphicsItem *> items; + + QRectF polyRect(polygon.boundingRect()); + _q_adjustRect(&polyRect); + QPainterPath path; + + // The index returns a rough estimate of what items are inside the rect. + // Refine it by iterating through all returned items. + foreach (QGraphicsItem *item, estimateItems(polyRect, order, deviceTransform)) { + // Find the item's scene transform in a clever way. + QTransform x = item->sceneTransform(); + bool keep = false; + + // ### _q_adjustedRect is only needed because QRectF::intersects, + // QRectF::contains and QTransform::map() and friends don't work with + // flat rectangles. + const QRectF br(adjustedItemBoundingRect(item)); + if (mode >= Qt::ContainsItemBoundingRect) { + // Polygon contains/intersects item's bounding rect + if (path == QPainterPath()) + path.addPolygon(polygon); + if ((mode == Qt::IntersectsItemBoundingRect && path.intersects(x.mapRect(br))) + || (mode == Qt::ContainsItemBoundingRect && path.contains(x.mapRect(br)))) { + items << item; + keep = true; + } + } else { + // Polygon contains/intersects item's shape + if (QRectF_intersects(polyRect, x.mapRect(br))) { + bool ok; + QTransform xinv = x.inverted(&ok); + if (ok) { + if (path == QPainterPath()) + path.addPolygon(polygon); + if (d->scene->d_func()->itemCollidesWithPath(item, xinv.map(path), mode)) { + items << item; + keep = true; + } + } + } + } + + if (keep && (item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) { + // Recurse into children that clip children. + bool ok; + QTransform xinv = x.inverted(&ok); + if (ok) + d->childItems_helper(&items, item, xinv.map(polygon), mode); + } + } + //### Needed but it should be handle differently + if (order != Qt::SortOrder(-1)) + QGraphicsSceneBspTreeIndexPrivate::sortItems(&items, order, false); + return items; +} +QList<QGraphicsItem *> QGraphicsSceneIndex::items(const QPainterPath &path, Qt::ItemSelectionMode mode, Qt::SortOrder order, const QTransform &deviceTransform) const +{ + Q_D(const QGraphicsSceneIndex); + QList<QGraphicsItem *> items; + QRectF pathRect(path.controlPointRect()); + _q_adjustRect(&pathRect); + + // The index returns a rough estimate of what items are inside the rect. + // Refine it by iterating through all returned items. + foreach (QGraphicsItem *item, estimateItems(pathRect, order, deviceTransform)) { + // Find the item's scene transform in a clever way. + QTransform x = item->sceneTransform(); + bool keep = false; + + // ### _q_adjustedRect is only needed because QRectF::intersects, + // QRectF::contains and QTransform::map() and friends don't work with + // flat rectangles. + const QRectF br(adjustedItemBoundingRect(item)); + if (mode >= Qt::ContainsItemBoundingRect) { + // Path contains/intersects item's bounding rect + if ((mode == Qt::IntersectsItemBoundingRect && path.intersects(x.mapRect(br))) + || (mode == Qt::ContainsItemBoundingRect && path.contains(x.mapRect(br)))) { + items << item; + keep = true; + } + } else { + // Path contains/intersects item's shape + if (QRectF_intersects(pathRect, x.mapRect(br))) { + bool ok; + QTransform xinv = x.inverted(&ok); + if (ok) { + if (d->scene->d_func()->itemCollidesWithPath(item, xinv.map(path), mode)) { + items << item; + keep = true; + } + } + } + } + + if (keep && (item->flags() & QGraphicsItem::ItemClipsChildrenToShape)) { + bool ok; + QTransform xinv = x.inverted(&ok); + if (ok) + d->childItems_helper(&items, item, xinv.map(path), mode); + } + } + //### Needed but it should be handle differently + if (order != Qt::SortOrder(-1)) + QGraphicsSceneBspTreeIndexPrivate::sortItems(&items, order, false); + return items; +} + +/*! + This pure virtual function return an estimation of items at position \a pos. + +*/ +QList<QGraphicsItem *> QGraphicsSceneIndex::estimateItems(const QPointF &point, Qt::SortOrder order, const QTransform &deviceTransform) const +{ + return estimateItems(QRectF(point, QSize(1,1)), order, deviceTransform); +} + +/*! + \fn virtual QList<QGraphicsItem *> estimateItems(const QRectF &rect, Qt::SortOrder order, const QTransform &deviceTransform) const = 0 + + This pure virtual function return an estimation of items in the \a rect. + +*/ + + +/*! + This virtual function removes all items in the scene index. +*/ +void QGraphicsSceneIndex::clear() +{ + for (int i = 0 ; i < items().size(); ++i) + removeItem(items().at(i)); +} + +/*! + \fn virtual void addItem(QGraphicsItem *item) = 0 + + This pure virtual function inserts an item to the scene index. + + \sa removeItem(), deleteItem() +*/ + +/*! + \fn virtual void removeItem(QGraphicsItem *item) = 0 + + This pure virtual function removes an item to the scene index. + + \sa addItem(), deleteItem() +*/ + +/*! + This method is called when an item has been deleted. + The default implementation call removeItem. Be carefull, + if your implementation of removeItem use pure virtual method + of QGraphicsItem like boundingRect(), then you should reimplement + this method. + + \sa addItem(), removeItem() +*/ +void QGraphicsSceneIndex::deleteItem(QGraphicsItem *item) +{ + removeItem(item); +} + +/*! + This virtual function is called by QGraphicsItem to notify the index + that some part of the item's state changes. By reimplementing this + function, your can react to a change, and in some cases, (depending on \a + change,) adjustments in the index can be made. + + \a change is the parameter of the item that is changing. \a value is the + value that changed; the type of the value depends on \a change. + + The default implementation does nothing. + + \sa GraphicsItemChange +*/ +void QGraphicsSceneIndex::itemChanged(const QGraphicsItem *item, QGraphicsItem::GraphicsItemChange, const QVariant &value) +{ +} + +/*! + Notify the index for a geometry change of an item. + + \sa QGraphicsItem::prepareGeometryChange +*/ +void QGraphicsSceneIndex::prepareBoundingRectChange(const QGraphicsItem *item) +{ +} + +/*! + This virtual function is called when the scene changes its bounding + rectangle. + \sa QGraphicsScene::sceneRect +*/ +void QGraphicsSceneIndex::sceneRectChanged(const QRectF &rect) +{ +} + +QT_END_NAMESPACE + +#include "moc_qgraphicssceneindex.cpp" + +#endif // QT_NO_GRAPHICSVIEW |