/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying ** this package. ** ** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #ifndef QGRAPHICSANCHORLAYOUT_P_H #define QGRAPHICSANCHORLAYOUT_P_H // // W A R N I N G // ------------- // // This file is not part of the Qt API. It exists purely as an // implementation detail. This header file may change from version to // version without notice, or even be removed. // // We mean it. // #include #include #include "qgraphicslayout_p.h" #include "qgraphicsanchorlayout.h" #include "qgraph_p.h" #include "qsimplex_p.h" QT_BEGIN_NAMESPACE /* The public QGraphicsAnchorLayout interface represents an anchorage point as a pair of a and a . Internally though, it has a graph of anchorage points (vertices) and anchors (edges), represented by the AnchorVertex and AnchorData structs respectively. */ /*! \internal Represents a vertex (anchorage point) in the internal graph */ struct AnchorVertex { AnchorVertex(QGraphicsLayoutItem *item, Qt::AnchorPoint edge) : m_item(item), m_edge(edge) {} AnchorVertex() : m_item(0), m_edge(Qt::AnchorPoint(0)) {} #ifdef QT_DEBUG inline QString toString() const; #endif QGraphicsLayoutItem *m_item; Qt::AnchorPoint m_edge; // Current distance from this vertex to the layout edge (Left or Top) // Value is calculated from the current anchors sizes. qreal distance; }; #ifdef QT_DEBUG inline QString AnchorVertex::toString() const { if (!this || !m_item) { return QLatin1String("NULL"); } QString edge; switch (m_edge) { case Qt::AnchorLeft: edge = QLatin1String("Left"); break; case Qt::AnchorHorizontalCenter: edge = QLatin1String("HorizontalCenter"); break; case Qt::AnchorRight: edge = QLatin1String("Right"); break; case Qt::AnchorTop: edge = QLatin1String("Top"); break; case Qt::AnchorVerticalCenter: edge = QLatin1String("VerticalCenter"); break; case Qt::AnchorBottom: edge = QLatin1String("Bottom"); break; default: edge = QLatin1String("None"); break; } QString itemName; if (m_item->isLayout()) { itemName = QLatin1String("layout"); } else { if (QGraphicsItem *item = m_item->graphicsItem()) { itemName = item->data(0).toString(); } } edge.insert(0, QLatin1String("%1_")); return edge.arg(itemName); } #endif /*! \internal Represents an edge (anchor) in the internal graph. */ struct AnchorData : public QSimplexVariable { enum Type { Normal = 0, Sequential, Parallel }; AnchorData() : QSimplexVariable(), item(0), from(0), to(0), minSize(0), prefSize(0), expSize(0), maxSize(0), sizeAtMinimum(0), sizeAtPreferred(0), sizeAtExpanding(0), sizeAtMaximum(0), graphicsAnchor(0), skipInPreferred(0), type(Normal), hasSize(true), isLayoutAnchor(false), isCenterAnchor(false), orientation(0) {} virtual void updateChildrenSizes() {} virtual bool refreshSizeHints(qreal effectiveSpacing); virtual ~AnchorData() {} #ifdef QT_DEBUG void dump(int indent = 2); inline QString toString() const; QString name; #endif inline void setPreferredSize(qreal size) { prefSize = size; hasSize = true; } inline void unsetSize() { hasSize = false; } // Internal anchors have associated items QGraphicsLayoutItem *item; // Anchor is semantically directed AnchorVertex *from; AnchorVertex *to; // Size restrictions of this edge. For anchors internal to items, these // values are derived from the respective item size hints. For anchors // that were added by users, these values are equal to the specified anchor // size. qreal minSize; qreal prefSize; qreal expSize; qreal maxSize; // These attributes define which sizes should that anchor be in when the // layout is at its minimum, preferred or maximum sizes. Values are // calculated by the Simplex solver based on the current layout setup. qreal sizeAtMinimum; qreal sizeAtPreferred; qreal sizeAtExpanding; qreal sizeAtMaximum; QGraphicsAnchor *graphicsAnchor; uint skipInPreferred : 1; uint type : 2; // either Normal, Sequential or Parallel uint hasSize : 1; // if false, get size from style. uint isLayoutAnchor : 1; // if this anchor is an internal layout anchor uint isCenterAnchor : 1; uint orientation : 1; }; #ifdef QT_DEBUG inline QString AnchorData::toString() const { return QString::fromAscii("Anchor(%1)").arg(name); } #endif struct SequentialAnchorData : public AnchorData { SequentialAnchorData() : AnchorData() { type = AnchorData::Sequential; #ifdef QT_DEBUG name = QLatin1String("SequentialAnchorData"); #endif } virtual void updateChildrenSizes(); virtual bool refreshSizeHints(qreal effectiveSpacing); bool refreshSizeHints_helper(qreal effectiveSpacing, bool refreshChildren = true); void setVertices(const QVector &vertices) { m_children = vertices; #ifdef QT_DEBUG name = QString::fromAscii("%1 -- %2").arg(vertices.first()->toString(), vertices.last()->toString()); #endif } QVector m_children; // list of vertices in the sequence QVector m_edges; // keep the list of edges too. }; struct ParallelAnchorData : public AnchorData { ParallelAnchorData(AnchorData *first, AnchorData *second) : AnchorData(), firstEdge(first), secondEdge(second) { type = AnchorData::Parallel; // ### Those asserts force that both child anchors have the same direction, // but can't we simplify a pair of anchors in opposite directions? Q_ASSERT(first->from == second->from); Q_ASSERT(first->to == second->to); from = first->from; to = first->to; #ifdef QT_DEBUG name = QString::fromAscii("%1 | %2").arg(first->toString(), second->toString()); #endif } virtual void updateChildrenSizes(); virtual bool refreshSizeHints(qreal effectiveSpacing); bool refreshSizeHints_helper(qreal effectiveSpacing, bool refreshChildren = true); AnchorData* firstEdge; AnchorData* secondEdge; }; /*! \internal Representation of a valid path for a given vertex in the graph. In this struct, "positives" is the set of anchors that have been traversed in the forward direction, while "negatives" is the set with the ones walked backwards. This paths are compared against each other to produce LP Constraints, the exact order in which the anchors were traversed is not relevant. */ class GraphPath { public: GraphPath() {} QSimplexConstraint *constraint(const GraphPath &path) const; #ifdef QT_DEBUG QString toString() const; #endif QSet positives; QSet negatives; }; class QGraphicsAnchorLayoutPrivate; /*! \internal */ class QGraphicsAnchorPrivate : public QObjectPrivate { Q_DECLARE_PUBLIC(QGraphicsAnchor) public: explicit QGraphicsAnchorPrivate(int version = QObjectPrivateVersion); ~QGraphicsAnchorPrivate(); void setSpacing(qreal value); void unsetSpacing(); qreal spacing() const; void setSizePolicy(QSizePolicy::Policy policy); QGraphicsAnchorLayoutPrivate *layoutPrivate; AnchorData *data; QSizePolicy::Policy sizePolicy; }; /*! \internal QGraphicsAnchorLayout private methods and attributes. */ class Q_AUTOTEST_EXPORT QGraphicsAnchorLayoutPrivate : public QGraphicsLayoutPrivate { Q_DECLARE_PUBLIC(QGraphicsAnchorLayout) public: // When the layout geometry is different from its Minimum, Preferred // or Maximum values, interpolation is used to calculate the geometries // of the items. // // Interval represents which interpolation interval are we operating in. enum Interval { MinToPreferred = 0, PreferredToExpanding, ExpandingToMax }; // Several structures internal to the layout are duplicated to handle // both Horizontal and Vertical restrictions. // // Orientation is used to reference the right structure in each context enum Orientation { Horizontal = 0, Vertical, NOrientations }; QGraphicsAnchorLayoutPrivate(); static QGraphicsAnchorLayoutPrivate *get(QGraphicsAnchorLayout *q) { return q ? q->d_func() : 0; } static Qt::AnchorPoint oppositeEdge( Qt::AnchorPoint edge); static Orientation edgeOrientation(Qt::AnchorPoint edge); static Qt::AnchorPoint pickEdge(Qt::AnchorPoint edge, Orientation orientation) { if (orientation == Vertical && int(edge) <= 2) return (Qt::AnchorPoint)(edge + 3); else if (orientation == Horizontal && int(edge) >= 3) { return (Qt::AnchorPoint)(edge - 3); } return edge; } // Init methods void createLayoutEdges(); void deleteLayoutEdges(); void createItemEdges(QGraphicsLayoutItem *item); void createCenterAnchors(QGraphicsLayoutItem *item, Qt::AnchorPoint centerEdge); void removeCenterAnchors(QGraphicsLayoutItem *item, Qt::AnchorPoint centerEdge, bool substitute = true); void removeCenterConstraints(QGraphicsLayoutItem *item, Orientation orientation); QGraphicsAnchor *acquireGraphicsAnchor(AnchorData *data) { Q_Q(QGraphicsAnchorLayout); if (!data->graphicsAnchor) { data->graphicsAnchor = new QGraphicsAnchor(q); data->graphicsAnchor->d_func()->data = data; } return data->graphicsAnchor; } // function used by the 4 API functions QGraphicsAnchor *addAnchor(QGraphicsLayoutItem *firstItem, Qt::AnchorPoint firstEdge, QGraphicsLayoutItem *secondItem, Qt::AnchorPoint secondEdge, qreal *spacing = 0); // Helper for Anchor Manipulation methods void addAnchor_helper(QGraphicsLayoutItem *firstItem, Qt::AnchorPoint firstEdge, QGraphicsLayoutItem *secondItem, Qt::AnchorPoint secondEdge, AnchorData *data); QGraphicsAnchor *getAnchor(QGraphicsLayoutItem *firstItem, Qt::AnchorPoint firstEdge, QGraphicsLayoutItem *secondItem, Qt::AnchorPoint secondEdge); void removeAnchor(AnchorVertex *firstVertex, AnchorVertex *secondVertex); void removeAnchor_helper(AnchorVertex *v1, AnchorVertex *v2); void setAnchorSize(AnchorData *data, const qreal *anchorSize); void anchorSize(const AnchorData *data, qreal *minSize = 0, qreal *prefSize = 0, qreal *maxSize = 0) const; void removeAnchors(QGraphicsLayoutItem *item); void removeVertex(QGraphicsLayoutItem *item, Qt::AnchorPoint edge); void correctEdgeDirection(QGraphicsLayoutItem *&firstItem, Qt::AnchorPoint &firstEdge, QGraphicsLayoutItem *&secondItem, Qt::AnchorPoint &secondEdge); // for getting the actual spacing (will query the style if the // spacing is not explicitly set). qreal effectiveSpacing(Orientation orientation) const; // Activation methods bool simplifyGraph(Orientation orientation); bool simplifyGraphIteration(Orientation orientation, bool *feasible); void restoreSimplifiedGraph(Orientation orientation); void calculateGraphs(); void calculateGraphs(Orientation orientation); bool calculateTrunk(Orientation orientation, const GraphPath &trunkPath, const QList &constraints, const QList &variables); bool calculateNonTrunk(const QList &constraints, const QList &variables); bool refreshAllSizeHints(Orientation orientation); void findPaths(Orientation orientation); void constraintsFromPaths(Orientation orientation); void updateAnchorSizes(Orientation orientation); QList constraintsFromSizeHints(const QList &anchors); QList > getGraphParts(Orientation orientation); void identifyFloatItems(const QSet &visited, Orientation orientation); void identifyNonFloatItems_helper(const AnchorData *ad, QSet *nonFloatingItemsIdentifiedSoFar); inline AnchorVertex *internalVertex(const QPair &itemEdge) const { return m_vertexList.value(itemEdge).first; } inline AnchorVertex *internalVertex(const QGraphicsLayoutItem *item, Qt::AnchorPoint edge) const { return internalVertex(qMakePair(const_cast(item), edge)); } AnchorVertex *addInternalVertex(QGraphicsLayoutItem *item, Qt::AnchorPoint edge); void removeInternalVertex(QGraphicsLayoutItem *item, Qt::AnchorPoint edge); // Geometry interpolation methods void setItemsGeometries(const QRectF &geom); void calculateVertexPositions(Orientation orientation); void setupEdgesInterpolation(Orientation orientation); void interpolateEdge(AnchorVertex *base, AnchorData *edge, Orientation orientation); void interpolateSequentialEdges(AnchorVertex *base, SequentialAnchorData *edge, Orientation orientation); void interpolateParallelEdges(AnchorVertex *base, ParallelAnchorData *edge, Orientation orientation); // Linear Programming solver methods bool solveMinMax(const QList &constraints, GraphPath path, qreal *min, qreal *max); bool solvePreferred(const QList &constraints, const QList &variables); void solveExpanding(const QList &constraints, const QList &variables); bool hasConflicts() const; #ifdef QT_DEBUG void dumpGraph(const QString &name = QString()); #endif qreal spacings[NOrientations]; // Size hints from simplex engine qreal sizeHints[2][3]; qreal sizeAtExpanding[2]; // Items QVector items; // Mapping between high level anchorage points (Item, Edge) to low level // ones (Graph Vertices) QHash, QPair > m_vertexList; // Internal graph of anchorage points and anchors, for both orientations Graph graph[2]; // Graph paths and constraints, for both orientations QMultiHash graphPaths[2]; QList constraints[2]; QList itemCenterConstraints[2]; // The interpolation interval and progress based on the current size // as well as the key values (minimum, preferred and maximum) Interval interpolationInterval[2]; qreal interpolationProgress[2]; // ### bool graphSimplified[2]; bool graphHasConflicts[2]; QSet m_floatItems[2]; #if defined(QT_DEBUG) || defined(Q_AUTOTEST_EXPORT) bool lastCalculationUsedSimplex[2]; #endif uint calculateGraphCacheDirty : 1; friend class QGraphicsAnchorPrivate; }; QT_END_NAMESPACE #endif