diff options
Diffstat (limited to 'src/gui/graphicsview/qgraphicsanchorlayout_p.cpp')
| -rw-r--r-- | src/gui/graphicsview/qgraphicsanchorlayout_p.cpp | 937 |
1 files changed, 579 insertions, 358 deletions
diff --git a/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp b/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp index 41aa8aac9a..182594e55b 100644 --- a/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp +++ b/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp @@ -61,6 +61,8 @@ QGraphicsAnchorPrivate::QGraphicsAnchorPrivate(int version) QGraphicsAnchorPrivate::~QGraphicsAnchorPrivate() { + // ### + layoutPrivate->restoreSimplifiedGraph(QGraphicsAnchorLayoutPrivate::Orientation(data->orientation)); layoutPrivate->removeAnchor(data->from, data->to); } @@ -105,7 +107,7 @@ qreal QGraphicsAnchorPrivate::spacing() const static void internalSizeHints(QSizePolicy::Policy policy, qreal minSizeHint, qreal prefSizeHint, qreal maxSizeHint, qreal *minSize, qreal *prefSize, - qreal *expSize, qreal *maxSize) + qreal *maxSize) { // minSize, prefSize and maxSize are initialized // with item's preferred Size: this is QSizePolicy::Fixed. @@ -135,11 +137,6 @@ static void internalSizeHints(QSizePolicy::Policy policy, *prefSize = *minSize; else *prefSize = prefSizeHint; - - if (policy & QSizePolicy::ExpandFlag) - *expSize = *maxSize; - else - *expSize = *prefSize; } bool AnchorData::refreshSizeHints(const QLayoutStyleInfo *styleInfo) @@ -154,7 +151,6 @@ bool AnchorData::refreshSizeHints(const QLayoutStyleInfo *styleInfo) if (isLayoutAnchor) { minSize = 0; prefSize = 0; - expSize = 0; maxSize = QWIDGETSIZE_MAX; if (isCenterAnchor) maxSize /= 2; @@ -205,8 +201,8 @@ bool AnchorData::refreshSizeHints(const QLayoutStyleInfo *styleInfo) } maxSizeHint = QWIDGETSIZE_MAX; } - internalSizeHints(policy, minSizeHint, prefSizeHint, maxSizeHint, - &minSize, &prefSize, &expSize, &maxSize); + internalSizeHints(policy, minSizeHint, prefSizeHint, maxSizeHint, + &minSize, &prefSize, &maxSize); // Set the anchor effective sizes to preferred. // @@ -217,7 +213,6 @@ bool AnchorData::refreshSizeHints(const QLayoutStyleInfo *styleInfo) // recalculate and override the values we set here. sizeAtMinimum = prefSize; sizeAtPreferred = prefSize; - sizeAtExpanding = prefSize; sizeAtMaximum = prefSize; return true; @@ -225,10 +220,20 @@ bool AnchorData::refreshSizeHints(const QLayoutStyleInfo *styleInfo) void ParallelAnchorData::updateChildrenSizes() { - firstEdge->sizeAtMinimum = secondEdge->sizeAtMinimum = sizeAtMinimum; - firstEdge->sizeAtPreferred = secondEdge->sizeAtPreferred = sizeAtPreferred; - firstEdge->sizeAtExpanding = secondEdge->sizeAtExpanding = sizeAtExpanding; - firstEdge->sizeAtMaximum = secondEdge->sizeAtMaximum = sizeAtMaximum; + firstEdge->sizeAtMinimum = sizeAtMinimum; + firstEdge->sizeAtPreferred = sizeAtPreferred; + firstEdge->sizeAtMaximum = sizeAtMaximum; + + const bool secondFwd = (secondEdge->from == from); + if (secondFwd) { + secondEdge->sizeAtMinimum = sizeAtMinimum; + secondEdge->sizeAtPreferred = sizeAtPreferred; + secondEdge->sizeAtMaximum = sizeAtMaximum; + } else { + secondEdge->sizeAtMinimum = -sizeAtMinimum; + secondEdge->sizeAtPreferred = -sizeAtPreferred; + secondEdge->sizeAtMaximum = -sizeAtMaximum; + } firstEdge->updateChildrenSizes(); secondEdge->updateChildrenSizes(); @@ -247,8 +252,16 @@ bool ParallelAnchorData::refreshSizeHints_helper(const QLayoutStyleInfo *styleIn return false; } - minSize = qMax(firstEdge->minSize, secondEdge->minSize); - maxSize = qMin(firstEdge->maxSize, secondEdge->maxSize); + // Account for parallel anchors where the second edge is backwards. + // We rely on the fact that a forward anchor of sizes min, pref, max is equivalent + // to a backwards anchor of size (-max, -pref, -min) + const bool secondFwd = (secondEdge->from == from); + const qreal secondMin = secondFwd ? secondEdge->minSize : -secondEdge->maxSize; + const qreal secondPref = secondFwd ? secondEdge->prefSize : -secondEdge->prefSize; + const qreal secondMax = secondFwd ? secondEdge->maxSize : -secondEdge->minSize; + + minSize = qMax(firstEdge->minSize, secondMin); + maxSize = qMin(firstEdge->maxSize, secondMax); // This condition means that the maximum size of one anchor being simplified is smaller than // the minimum size of the other anchor. The consequence is that there won't be a valid size @@ -257,16 +270,27 @@ bool ParallelAnchorData::refreshSizeHints_helper(const QLayoutStyleInfo *styleIn return false; } - expSize = qMax(firstEdge->expSize, secondEdge->expSize); - expSize = qMin(expSize, maxSize); + // The equivalent preferred Size of a parallel anchor is calculated as to + // reduce the deviation from the original preferred sizes _and_ to avoid shrinking + // items below their preferred sizes, unless strictly needed. - prefSize = qMax(firstEdge->prefSize, secondEdge->prefSize); - prefSize = qMin(prefSize, expSize); + // ### This logic only holds if all anchors in the layout are "well-behaved" in the + // following terms: + // + // - There are no negative-sized anchors + // - All sequential anchors are composed of children in the same direction as the + // sequential anchor itself + // + // With these assumptions we can grow a child knowing that no hidden items will + // have to shrink as the result of that. + // If any of these does not hold, we have a situation where the ParallelAnchor + // does not have enough information to calculate its equivalent prefSize. + prefSize = qMax(firstEdge->prefSize, secondPref); + prefSize = qMin(prefSize, maxSize); // See comment in AnchorData::refreshSizeHints() about sizeAt* values sizeAtMinimum = prefSize; sizeAtPreferred = prefSize; - sizeAtExpanding = prefSize; sizeAtMaximum = prefSize; return true; @@ -280,8 +304,7 @@ bool ParallelAnchorData::refreshSizeHints_helper(const QLayoutStyleInfo *styleIn 1 is at Maximum */ static QPair<QGraphicsAnchorLayoutPrivate::Interval, qreal> getFactor(qreal value, qreal min, - qreal pref, qreal exp, - qreal max) + qreal pref, qreal max) { QGraphicsAnchorLayoutPrivate::Interval interval; qreal lower; @@ -291,13 +314,9 @@ static QPair<QGraphicsAnchorLayoutPrivate::Interval, qreal> getFactor(qreal valu interval = QGraphicsAnchorLayoutPrivate::MinToPreferred; lower = min; upper = pref; - } else if (value < exp) { - interval = QGraphicsAnchorLayoutPrivate::PreferredToExpanding; - lower = pref; - upper = exp; } else { - interval = QGraphicsAnchorLayoutPrivate::ExpandingToMax; - lower = exp; + interval = QGraphicsAnchorLayoutPrivate::PreferredToMax; + lower = pref; upper = max; } @@ -313,7 +332,7 @@ static QPair<QGraphicsAnchorLayoutPrivate::Interval, qreal> getFactor(qreal valu static qreal interpolate(const QPair<QGraphicsAnchorLayoutPrivate::Interval, qreal> &factor, qreal min, qreal pref, - qreal exp, qreal max) + qreal max) { qreal lower; qreal upper; @@ -323,12 +342,8 @@ static qreal interpolate(const QPair<QGraphicsAnchorLayoutPrivate::Interval, qre lower = min; upper = pref; break; - case QGraphicsAnchorLayoutPrivate::PreferredToExpanding: + case QGraphicsAnchorLayoutPrivate::PreferredToMax: lower = pref; - upper = exp; - break; - case QGraphicsAnchorLayoutPrivate::ExpandingToMax: - lower = exp; upper = max; break; } @@ -341,34 +356,31 @@ void SequentialAnchorData::updateChildrenSizes() // ### REMOVE ME // ### check whether we are guarantee to get those or we need to warn stuff at this // point. - Q_ASSERT(sizeAtMinimum > minSize || qFuzzyCompare(sizeAtMinimum, minSize)); - Q_ASSERT(sizeAtMinimum < maxSize || qFuzzyCompare(sizeAtMinimum, maxSize)); - Q_ASSERT(sizeAtPreferred > minSize || qFuzzyCompare(sizeAtPreferred, minSize)); - Q_ASSERT(sizeAtPreferred < maxSize || qFuzzyCompare(sizeAtPreferred, maxSize)); - Q_ASSERT(sizeAtExpanding > minSize || qFuzzyCompare(sizeAtExpanding, minSize)); - Q_ASSERT(sizeAtExpanding < maxSize || qFuzzyCompare(sizeAtExpanding, maxSize)); - Q_ASSERT(sizeAtMaximum > minSize || qFuzzyCompare(sizeAtMaximum, minSize)); - Q_ASSERT(sizeAtMaximum < maxSize || qFuzzyCompare(sizeAtMaximum, maxSize)); + Q_ASSERT(sizeAtMinimum > minSize || qAbs(sizeAtMinimum - minSize) < 0.00000001); + Q_ASSERT(sizeAtPreferred > minSize || qAbs(sizeAtPreferred - minSize) < 0.00000001); + Q_ASSERT(sizeAtMaximum > minSize || qAbs(sizeAtMaximum - minSize) < 0.00000001); + + // These may be false if this anchor was in parallel with the layout stucture + // Q_ASSERT(sizeAtMinimum < maxSize || qAbs(sizeAtMinimum - maxSize) < 0.00000001); + // Q_ASSERT(sizeAtPreferred < maxSize || qAbs(sizeAtPreferred - maxSize) < 0.00000001); + // Q_ASSERT(sizeAtMaximum < maxSize || qAbs(sizeAtMaximum - maxSize) < 0.00000001); // Band here refers if the value is in the Minimum To Preferred // band (the lower band) or the Preferred To Maximum (the upper band). const QPair<QGraphicsAnchorLayoutPrivate::Interval, qreal> minFactor = - getFactor(sizeAtMinimum, minSize, prefSize, expSize, maxSize); + getFactor(sizeAtMinimum, minSize, prefSize, maxSize); const QPair<QGraphicsAnchorLayoutPrivate::Interval, qreal> prefFactor = - getFactor(sizeAtPreferred, minSize, prefSize, expSize, maxSize); - const QPair<QGraphicsAnchorLayoutPrivate::Interval, qreal> expFactor = - getFactor(sizeAtExpanding, minSize, prefSize, expSize, maxSize); + getFactor(sizeAtPreferred, minSize, prefSize, maxSize); const QPair<QGraphicsAnchorLayoutPrivate::Interval, qreal> maxFactor = - getFactor(sizeAtMaximum, minSize, prefSize, expSize, maxSize); + getFactor(sizeAtMaximum, minSize, prefSize, maxSize); for (int i = 0; i < m_edges.count(); ++i) { AnchorData *e = m_edges.at(i); - e->sizeAtMinimum = interpolate(minFactor, e->minSize, e->prefSize, e->expSize, e->maxSize); - e->sizeAtPreferred = interpolate(prefFactor, e->minSize, e->prefSize, e->expSize, e->maxSize); - e->sizeAtExpanding = interpolate(expFactor, e->minSize, e->prefSize, e->expSize, e->maxSize); - e->sizeAtMaximum = interpolate(maxFactor, e->minSize, e->prefSize, e->expSize, e->maxSize); + e->sizeAtMinimum = interpolate(minFactor, e->minSize, e->prefSize, e->maxSize); + e->sizeAtPreferred = interpolate(prefFactor, e->minSize, e->prefSize, e->maxSize); + e->sizeAtMaximum = interpolate(maxFactor, e->minSize, e->prefSize, e->maxSize); e->updateChildrenSizes(); } @@ -384,7 +396,6 @@ bool SequentialAnchorData::refreshSizeHints_helper(const QLayoutStyleInfo *style { minSize = 0; prefSize = 0; - expSize = 0; maxSize = 0; for (int i = 0; i < m_edges.count(); ++i) { @@ -396,14 +407,12 @@ bool SequentialAnchorData::refreshSizeHints_helper(const QLayoutStyleInfo *style minSize += edge->minSize; prefSize += edge->prefSize; - expSize += edge->expSize; maxSize += edge->maxSize; } // See comment in AnchorData::refreshSizeHints() about sizeAt* values sizeAtMinimum = prefSize; sizeAtPreferred = prefSize; - sizeAtExpanding = prefSize; sizeAtMaximum = prefSize; return true; @@ -478,12 +487,15 @@ QGraphicsAnchorLayoutPrivate::QGraphicsAnchorLayoutPrivate() for (int j = 0; j < 3; ++j) { sizeHints[i][j] = -1; } - sizeAtExpanding[i] = -1; interpolationProgress[i] = -1; spacings[i] = -1; graphSimplified[i] = false; graphHasConflicts[i] = false; + + layoutFirstVertex[i] = 0; + layoutCentralVertex[i] = 0; + layoutLastVertex[i] = 0; } } @@ -526,33 +538,67 @@ inline static qreal checkAdd(qreal a, qreal b) /*! \internal - Adds \a newAnchor to the graph \a g. + Adds \a newAnchor to the graph. Returns the newAnchor itself if it could be added without further changes to the graph. If a - new parallel anchor had to be created, then returns the new parallel anchor. In case the - addition is unfeasible -- because a parallel setup is not possible, returns 0. + new parallel anchor had to be created, then returns the new parallel anchor. If a parallel anchor + had to be created and it results in an unfeasible setup, \a feasible is set to false, otherwise + true. + + Note that in the case a new parallel anchor is created, it might also take over some constraints + from its children anchors. */ -static AnchorData *addAnchorMaybeParallel(Graph<AnchorVertex, AnchorData> *g, - AnchorData *newAnchor) +AnchorData *QGraphicsAnchorLayoutPrivate::addAnchorMaybeParallel(AnchorData *newAnchor, bool *feasible) { - bool feasible = true; + Orientation orientation = Orientation(newAnchor->orientation); + Graph<AnchorVertex, AnchorData> &g = graph[orientation]; + *feasible = true; // If already exists one anchor where newAnchor is supposed to be, we create a parallel // anchor. - if (AnchorData *oldAnchor = g->takeEdge(newAnchor->from, newAnchor->to)) { + if (AnchorData *oldAnchor = g.takeEdge(newAnchor->from, newAnchor->to)) { ParallelAnchorData *parallel = new ParallelAnchorData(oldAnchor, newAnchor); + // The parallel anchor will "replace" its children anchors in + // every center constraint that they appear. + + // ### If the dependent (center) anchors had reference(s) to their constraints, we + // could avoid traversing all the itemCenterConstraints. + QList<QSimplexConstraint *> &constraints = itemCenterConstraints[orientation]; + + AnchorData *children[2] = { oldAnchor, newAnchor }; + QList<QSimplexConstraint *> *childrenConstraints[2] = { ¶llel->m_firstConstraints, + ¶llel->m_secondConstraints }; + + for (int i = 0; i < 2; ++i) { + AnchorData *child = children[i]; + QList<QSimplexConstraint *> *childConstraints = childrenConstraints[i]; + + if (!child->isCenterAnchor) + continue; + + parallel->isCenterAnchor = true; + + for (int i = 0; i < constraints.count(); ++i) { + QSimplexConstraint *c = constraints[i]; + if (c->variables.contains(child)) { + childConstraints->append(c); + qreal v = c->variables.take(child); + c->variables.insert(parallel, v); + } + } + } + // At this point we can identify that the parallel anchor is not feasible, e.g. one // anchor minimum size is bigger than the other anchor maximum size. - feasible = parallel->refreshSizeHints_helper(0, false); + *feasible = parallel->refreshSizeHints_helper(0, false); newAnchor = parallel; } - g->createEdge(newAnchor->from, newAnchor->to, newAnchor); - return feasible ? newAnchor : 0; + g.createEdge(newAnchor->from, newAnchor->to, newAnchor); + return newAnchor; } - /*! \internal @@ -656,30 +702,185 @@ bool QGraphicsAnchorLayoutPrivate::simplifyGraph(Orientation orientation) if (graphSimplified[orientation]) return true; - graphSimplified[orientation] = true; #if 0 qDebug("Simplifying Graph for %s", orientation == Horizontal ? "Horizontal" : "Vertical"); #endif - if (!graph[orientation].rootVertex()) - return true; + // Vertex simplification + if (!simplifyVertices(orientation)) { + restoreVertices(orientation); + return false; + } + // Anchor simplification bool dirty; bool feasible = true; do { dirty = simplifyGraphIteration(orientation, &feasible); } while (dirty && feasible); - if (!feasible) - graphSimplified[orientation] = false; + // Note that if we are not feasible, we fallback and make sure that the graph is fully restored + if (!feasible) { + graphSimplified[orientation] = true; + restoreSimplifiedGraph(orientation); + restoreVertices(orientation); + return false; + } + + graphSimplified[orientation] = true; + return true; +} + +static AnchorVertex *replaceVertex_helper(AnchorData *data, AnchorVertex *oldV, AnchorVertex *newV) +{ + AnchorVertex *other; + if (data->from == oldV) { + data->from = newV; + other = data->to; + } else { + data->to = newV; + other = data->from; + } + return other; +} + +bool QGraphicsAnchorLayoutPrivate::replaceVertex(Orientation orientation, AnchorVertex *oldV, + AnchorVertex *newV, const QList<AnchorData *> &edges) +{ + Graph<AnchorVertex, AnchorData> &g = graph[orientation]; + bool feasible = true; + + for (int i = 0; i < edges.count(); ++i) { + AnchorData *ad = edges[i]; + AnchorVertex *otherV = replaceVertex_helper(ad, oldV, newV); + +#if defined(QT_DEBUG) + ad->name = QString::fromAscii("%1 --to--> %2").arg(ad->from->toString()).arg(ad->to->toString()); +#endif + + bool newFeasible; + AnchorData *newAnchor = addAnchorMaybeParallel(ad, &newFeasible); + feasible &= newFeasible; + + if (newAnchor != ad) { + // A parallel was created, we mark that in the list of anchors created by vertex + // simplification. This is needed because we want to restore them in a separate step + // from the restoration of anchor simplification. + anchorsFromSimplifiedVertices[orientation].append(newAnchor); + } + + g.takeEdge(oldV, otherV); + } return feasible; } /*! \internal +*/ +bool QGraphicsAnchorLayoutPrivate::simplifyVertices(Orientation orientation) +{ + Q_Q(QGraphicsAnchorLayout); + Graph<AnchorVertex, AnchorData> &g = graph[orientation]; + + // We'll walk through vertices + QStack<AnchorVertex *> stack; + stack.push(layoutFirstVertex[orientation]); + QSet<AnchorVertex *> visited; + + while (!stack.isEmpty()) { + AnchorVertex *v = stack.pop(); + visited.insert(v); + + // Each adjacent of 'v' is a possible vertex to be merged. So we traverse all of + // them. Since once a merge is made, we might add new adjacents, and we don't want to + // pass two times through one adjacent. The 'index' is used to track our position. + QList<AnchorVertex *> adjacents = g.adjacentVertices(v); + int index = 0; + + while (index < adjacents.count()) { + AnchorVertex *next = adjacents.at(index); + index++; + + AnchorData *data = g.edgeData(v, next); + const bool bothLayoutVertices = v->m_item == q && next->m_item == q; + const bool zeroSized = !data->minSize && !data->maxSize; + + if (!bothLayoutVertices && zeroSized) { + + // Create a new vertex pair, note that we keep a list of those vertices so we can + // easily process them when restoring the graph. + AnchorVertexPair *newV = new AnchorVertexPair(v, next, data); + simplifiedVertices[orientation].append(newV); + + // Collect the anchors of both vertices, the new vertex pair will take their place + // in those anchors + const QList<AnchorVertex *> &vAdjacents = g.adjacentVertices(v); + const QList<AnchorVertex *> &nextAdjacents = g.adjacentVertices(next); + + for (int i = 0; i < vAdjacents.count(); ++i) { + AnchorVertex *adjacent = vAdjacents.at(i); + if (adjacent != next) { + AnchorData *ad = g.edgeData(v, adjacent); + newV->m_firstAnchors.append(ad); + } + } + + for (int i = 0; i < nextAdjacents.count(); ++i) { + AnchorVertex *adjacent = nextAdjacents.at(i); + if (adjacent != v) { + AnchorData *ad = g.edgeData(next, adjacent); + newV->m_secondAnchors.append(ad); + + // We'll also add new vertices to the adjacent list of the new 'v', to be + // created as a vertex pair and replace the current one. + if (!adjacents.contains(adjacent)) + adjacents.append(adjacent); + } + } + + // ### merge this loop into the ones that calculated m_firstAnchors/m_secondAnchors? + // Make newV take the place of v and next + bool feasible = replaceVertex(orientation, v, newV, newV->m_firstAnchors); + feasible &= replaceVertex(orientation, next, newV, newV->m_secondAnchors); + + // Update the layout vertex information if one of the vertices is a layout vertex. + AnchorVertex *layoutVertex = 0; + if (v->m_item == q) + layoutVertex = v; + else if (next->m_item == q) + layoutVertex = next; + + if (layoutVertex) { + // Layout vertices always have m_item == q... + newV->m_item = q; + changeLayoutVertex(orientation, layoutVertex, newV); + } + + g.takeEdge(v, next); + + // If a non-feasibility is found, we leave early and cancel the simplification + if (!feasible) + return false; + + v = newV; + visited.insert(newV); + + } else if (!visited.contains(next) && !stack.contains(next)) { + // If the adjacent is not fit for merge and it wasn't visited by the outermost + // loop, we add it to the stack. + stack.push(next); + } + } + } + + return true; +} + +/*! + \internal One iteration of the simplification algorithm. Returns true if another iteration is needed. @@ -700,7 +901,7 @@ bool QGraphicsAnchorLayoutPrivate::simplifyGraphIteration(QGraphicsAnchorLayoutP QSet<AnchorVertex *> visited; QStack<QPair<AnchorVertex *, AnchorVertex *> > stack; - stack.push(qMakePair(static_cast<AnchorVertex *>(0), g.rootVertex())); + stack.push(qMakePair(static_cast<AnchorVertex *>(0), layoutFirstVertex[orientation])); QVector<AnchorVertex*> candidates; bool candidatesForward; @@ -719,7 +920,8 @@ bool QGraphicsAnchorLayoutPrivate::simplifyGraphIteration(QGraphicsAnchorLayoutP // (a) it is a layout vertex, we don't simplify away the layout vertices; // (b) it does not have exactly 2 adjacents; // (c) it will change the direction of the sequence; - // (d) its next adjacent is already visited (a cycle in the graph). + // (d) its next adjacent is already visited (a cycle in the graph); + // (e) the next anchor is a center anchor. const QList<AnchorVertex *> &adjacents = g.adjacentVertices(v); const bool isLayoutVertex = v->m_item == q; @@ -742,13 +944,14 @@ bool QGraphicsAnchorLayoutPrivate::simplifyGraphIteration(QGraphicsAnchorLayoutP candidatesForward = (beforeSequence == data->from); } - // This is a tricky part. We peek at the next vertex to find out + // This is a tricky part. We peek at the next vertex to find out whether // - // - whether the edge from this vertex to the next vertex has the same direction; - // - whether we already visited the next vertex. + // - the edge from this vertex to the next vertex has the same direction; + // - we already visited the next vertex; + // - the next anchor is a center. // - // Those are needed to identify (c) and (d). Note that unlike (a) and (b), we preempt - // the end of sequence by looking into the next vertex. + // Those are needed to identify the remaining end of sequence cases. Note that unlike + // (a) and (b), we preempt the end of sequence by looking into the next vertex. // Peek at the next vertex AnchorVertex *after; @@ -766,8 +969,8 @@ bool QGraphicsAnchorLayoutPrivate::simplifyGraphIteration(QGraphicsAnchorLayoutP const bool willChangeDirection = (candidatesForward != (v == data->from)); const bool cycleFound = visited.contains(after); - // Now cases (c) and (d)... - endOfSequence = willChangeDirection || cycleFound; + // Now cases (c), (d) and (e)... + endOfSequence = willChangeDirection || cycleFound || data->isCenterAnchor; if (endOfSequence) { if (!willChangeDirection) { @@ -839,9 +1042,10 @@ bool QGraphicsAnchorLayoutPrivate::simplifyGraphIteration(QGraphicsAnchorLayoutP // If 'beforeSequence' and 'afterSequence' already had an anchor between them, we'll // create a parallel anchor between the new sequence and the old anchor. - AnchorData *newAnchor = addAnchorMaybeParallel(&g, sequence); + bool newFeasible; + AnchorData *newAnchor = addAnchorMaybeParallel(sequence, &newFeasible); - if (!newAnchor) { + if (!newFeasible) { *feasible = false; return false; } @@ -861,48 +1065,70 @@ bool QGraphicsAnchorLayoutPrivate::simplifyGraphIteration(QGraphicsAnchorLayoutP return false; } -static void restoreSimplifiedAnchor(Graph<AnchorVertex, AnchorData> &g, - AnchorData *edge, - AnchorVertex *before, - AnchorVertex *after) +void QGraphicsAnchorLayoutPrivate::restoreSimplifiedAnchor(AnchorData *edge) { - Q_ASSERT(edge->type != AnchorData::Normal); #if 0 static const char *anchortypes[] = {"Normal", "Sequential", "Parallel"}; qDebug("Restoring %s edge.", anchortypes[int(edge->type)]); #endif - if (edge->type == AnchorData::Sequential) { - SequentialAnchorData* seqEdge = static_cast<SequentialAnchorData*>(edge); - // restore the sequential anchor - AnchorVertex *prev = before; - AnchorVertex *last = after; - if (edge->from != prev) - qSwap(last, prev); - - for (int i = 0; i < seqEdge->m_edges.count(); ++i) { - AnchorVertex *v1 = (i < seqEdge->m_children.count()) ? seqEdge->m_children.at(i) : last; - AnchorData *data = seqEdge->m_edges.at(i); - if (data->type != AnchorData::Normal) { - restoreSimplifiedAnchor(g, data, prev, v1); - } else { - g.createEdge(prev, v1, data); - } - prev = v1; + + Graph<AnchorVertex, AnchorData> &g = graph[edge->orientation]; + + if (edge->type == AnchorData::Normal) { + g.createEdge(edge->from, edge->to, edge); + + } else if (edge->type == AnchorData::Sequential) { + SequentialAnchorData *sequence = static_cast<SequentialAnchorData *>(edge); + + for (int i = 0; i < sequence->m_edges.count(); ++i) { + AnchorData *data = sequence->m_edges.at(i); + restoreSimplifiedAnchor(data); } + + delete sequence; + } else if (edge->type == AnchorData::Parallel) { - ParallelAnchorData* parallelEdge = static_cast<ParallelAnchorData*>(edge); - AnchorData *parallelEdges[2] = {parallelEdge->firstEdge, - parallelEdge->secondEdge}; - for (int i = 0; i < 2; ++i) { - AnchorData *data = parallelEdges[i]; - if (data->type == AnchorData::Normal) { - g.createEdge(before, after, data); - } else { - restoreSimplifiedAnchor(g, data, before, after); - } - } + + // Skip parallel anchors that were created by vertex simplification, they will be processed + // later, when restoring vertex simplification. + // ### we could improve this check bit having a bit inside 'edge' + if (anchorsFromSimplifiedVertices[edge->orientation].contains(edge)) + return; + + ParallelAnchorData* parallel = static_cast<ParallelAnchorData*>(edge); + restoreSimplifiedConstraints(parallel); + + // ### Because of the way parallel anchors are created in the anchor simplification + // algorithm, we know that one of these will be a sequence, so it'll be safe if the other + // anchor create an edge between the same vertices as the parallel. + Q_ASSERT(parallel->firstEdge->type == AnchorData::Sequential + || parallel->secondEdge->type == AnchorData::Sequential); + restoreSimplifiedAnchor(parallel->firstEdge); + restoreSimplifiedAnchor(parallel->secondEdge); + + delete parallel; + } +} + +void QGraphicsAnchorLayoutPrivate::restoreSimplifiedConstraints(ParallelAnchorData *parallel) +{ + if (!parallel->isCenterAnchor) + return; + + for (int i = 0; i < parallel->m_firstConstraints.count(); ++i) { + QSimplexConstraint *c = parallel->m_firstConstraints.at(i); + qreal v = c->variables[parallel]; + c->variables.remove(parallel); + c->variables.insert(parallel->firstEdge, v); + } + + for (int i = 0; i < parallel->m_secondConstraints.count(); ++i) { + QSimplexConstraint *c = parallel->m_secondConstraints.at(i); + qreal v = c->variables[parallel]; + c->variables.remove(parallel); + c->variables.insert(parallel->secondEdge, v); } } @@ -917,19 +1143,93 @@ void QGraphicsAnchorLayoutPrivate::restoreSimplifiedGraph(Orientation orientatio orientation == Horizontal ? "Horizontal" : "Vertical"); #endif + // Restore anchor simplification Graph<AnchorVertex, AnchorData> &g = graph[orientation]; - QList<QPair<AnchorVertex*, AnchorVertex*> > connections = g.connections(); for (int i = 0; i < connections.count(); ++i) { AnchorVertex *v1 = connections.at(i).first; AnchorVertex *v2 = connections.at(i).second; AnchorData *edge = g.edgeData(v1, v2); - if (edge->type != AnchorData::Normal) { - AnchorData *oldEdge = g.takeEdge(v1, v2); - restoreSimplifiedAnchor(g, edge, v1, v2); - delete oldEdge; + + // We restore only sequential anchors and parallels that were not created by + // vertex simplification. + if (edge->type == AnchorData::Sequential + || (edge->type == AnchorData::Parallel && + !anchorsFromSimplifiedVertices[orientation].contains(edge))) { + + g.takeEdge(v1, v2); + restoreSimplifiedAnchor(edge); } } + + restoreVertices(orientation); +} + +void QGraphicsAnchorLayoutPrivate::restoreVertices(Orientation orientation) +{ + Q_Q(QGraphicsAnchorLayout); + + Graph<AnchorVertex, AnchorData> &g = graph[orientation]; + QList<AnchorVertexPair *> &toRestore = simplifiedVertices[orientation]; + + // We will restore the vertices in the inverse order of creation, this way we ensure that + // the vertex being restored was not wrapped by another simplification. + for (int i = toRestore.count() - 1; i >= 0; --i) { + AnchorVertexPair *pair = toRestore.at(i); + QList<AnchorVertex *> adjacents = g.adjacentVertices(pair); + + // Restore the removed edge, this will also restore both vertices 'first' and 'second' to + // the graph structure. + AnchorVertex *first = pair->m_first; + AnchorVertex *second = pair->m_second; + g.createEdge(first, second, pair->m_removedAnchor); + + // Restore the anchors for the first child vertex + for (int j = 0; j < pair->m_firstAnchors.count(); ++j) { + AnchorData *ad = pair->m_firstAnchors.at(j); + Q_ASSERT(ad->from == pair || ad->to == pair); + + replaceVertex_helper(ad, pair, first); + g.createEdge(ad->from, ad->to, ad); + } + + // Restore the anchors for the second child vertex + for (int j = 0; j < pair->m_secondAnchors.count(); ++j) { + AnchorData *ad = pair->m_secondAnchors.at(j); + Q_ASSERT(ad->from == pair || ad->to == pair); + + replaceVertex_helper(ad, pair, second); + g.createEdge(ad->from, ad->to, ad); + } + + for (int j = 0; j < adjacents.count(); ++j) { + g.takeEdge(pair, adjacents.at(j)); + } + + // The pair simplified a layout vertex, so place back the correct vertex in the variable + // that track layout vertices + if (pair->m_item == q) { + AnchorVertex *layoutVertex = first->m_item == q ? first : second; + Q_ASSERT(layoutVertex->m_item == q); + changeLayoutVertex(orientation, pair, layoutVertex); + } + + delete pair; + } + toRestore.clear(); + + // The restoration process for vertex simplification also restored the effect of the + // parallel anchors created during vertex simplification, so we just need to restore + // the constraints in case of parallels that contain center anchors. For the same + // reason as above, order matters here. + QList<AnchorData *> ¶llelAnchors = anchorsFromSimplifiedVertices[orientation]; + + for (int i = parallelAnchors.count() - 1; i >= 0; --i) { + ParallelAnchorData *parallel = static_cast<ParallelAnchorData *>(parallelAnchors.at(i)); + restoreSimplifiedConstraints(parallel); + delete parallel; + } + parallelAnchors.clear(); } QGraphicsAnchorLayoutPrivate::Orientation @@ -959,9 +1259,10 @@ void QGraphicsAnchorLayoutPrivate::createLayoutEdges() data->maxSize = QWIDGETSIZE_MAX; data->skipInPreferred = 1; - // Set the Layout Left edge as the root of the horizontal graph. - AnchorVertex *v = internalVertex(layout, Qt::AnchorLeft); - graph[Horizontal].setRootVertex(v); + // Save a reference to layout vertices + layoutFirstVertex[Horizontal] = internalVertex(layout, Qt::AnchorLeft); + layoutCentralVertex[Horizontal] = 0; + layoutLastVertex[Horizontal] = internalVertex(layout, Qt::AnchorRight); // Vertical data = new AnchorData; @@ -970,17 +1271,18 @@ void QGraphicsAnchorLayoutPrivate::createLayoutEdges() data->maxSize = QWIDGETSIZE_MAX; data->skipInPreferred = 1; - // Set the Layout Top edge as the root of the vertical graph. - v = internalVertex(layout, Qt::AnchorTop); - graph[Vertical].setRootVertex(v); + // Save a reference to layout vertices + layoutFirstVertex[Vertical] = internalVertex(layout, Qt::AnchorTop); + layoutCentralVertex[Vertical] = 0; + layoutLastVertex[Vertical] = internalVertex(layout, Qt::AnchorBottom); } void QGraphicsAnchorLayoutPrivate::deleteLayoutEdges() { Q_Q(QGraphicsAnchorLayout); - Q_ASSERT(internalVertex(q, Qt::AnchorHorizontalCenter) == NULL); - Q_ASSERT(internalVertex(q, Qt::AnchorVerticalCenter) == NULL); + Q_ASSERT(!internalVertex(q, Qt::AnchorHorizontalCenter)); + Q_ASSERT(!internalVertex(q, Qt::AnchorVerticalCenter)); removeAnchor_helper(internalVertex(q, Qt::AnchorLeft), internalVertex(q, Qt::AnchorRight)); @@ -1019,6 +1321,8 @@ void QGraphicsAnchorLayoutPrivate::createItemEdges(QGraphicsLayoutItem *item) void QGraphicsAnchorLayoutPrivate::createCenterAnchors( QGraphicsLayoutItem *item, Qt::AnchorPoint centerEdge) { + Q_Q(QGraphicsAnchorLayout); + Orientation orientation; switch (centerEdge) { case Qt::AnchorHorizontalCenter: @@ -1061,24 +1365,32 @@ void QGraphicsAnchorLayoutPrivate::createCenterAnchors( c->variables.insert(data, 1.0); addAnchor_helper(item, firstEdge, item, centerEdge, data); data->isCenterAnchor = true; + data->dependency = AnchorData::Master; data->refreshSizeHints(0); data = new AnchorData; c->variables.insert(data, -1.0); addAnchor_helper(item, centerEdge, item, lastEdge, data); data->isCenterAnchor = true; + data->dependency = AnchorData::Slave; data->refreshSizeHints(0); itemCenterConstraints[orientation].append(c); // Remove old one removeAnchor_helper(first, last); + + if (item == q) { + layoutCentralVertex[orientation] = internalVertex(q, centerEdge); + } } void QGraphicsAnchorLayoutPrivate::removeCenterAnchors( QGraphicsLayoutItem *item, Qt::AnchorPoint centerEdge, bool substitute) { + Q_Q(QGraphicsAnchorLayout); + Orientation orientation; switch (centerEdge) { case Qt::AnchorHorizontalCenter: @@ -1120,7 +1432,7 @@ void QGraphicsAnchorLayoutPrivate::removeCenterAnchors( AnchorData *oldData = g.edgeData(first, center); // Remove center constraint for (int i = itemCenterConstraints[orientation].count() - 1; i >= 0; --i) { - if (itemCenterConstraints[orientation][i]->variables.contains(oldData)) { + if (itemCenterConstraints[orientation].at(i)->variables.contains(oldData)) { delete itemCenterConstraints[orientation].takeAt(i); break; } @@ -1151,6 +1463,10 @@ void QGraphicsAnchorLayoutPrivate::removeCenterAnchors( // by this time, the center vertex is deleted and merged into a non-centered internal anchor removeAnchor_helper(first, internalVertex(item, lastEdge)); } + + if (item == q) { + layoutCentralVertex[orientation] = 0; + } } @@ -1180,7 +1496,7 @@ void QGraphicsAnchorLayoutPrivate::removeCenterConstraints(QGraphicsLayoutItem * // Look for our anchor in all item center constraints, then remove it for (int i = 0; i < itemCenterConstraints[orientation].size(); ++i) { - if (itemCenterConstraints[orientation][i]->variables.contains(internalAnchor)) { + if (itemCenterConstraints[orientation].at(i)->variables.contains(internalAnchor)) { delete itemCenterConstraints[orientation].takeAt(i); break; } @@ -1690,7 +2006,7 @@ QList<AnchorData *> getVariables(QList<QSimplexConstraint *> constraints) { QSet<AnchorData *> variableSet; for (int i = 0; i < constraints.count(); ++i) { - const QSimplexConstraint *c = constraints[i]; + const QSimplexConstraint *c = constraints.at(i); foreach (QSimplexVariable *var, c->variables.keys()) { variableSet += static_cast<AnchorData *>(var); } @@ -1724,12 +2040,19 @@ QList<AnchorData *> getVariables(QList<QSimplexConstraint *> constraints) void QGraphicsAnchorLayoutPrivate::calculateGraphs( QGraphicsAnchorLayoutPrivate::Orientation orientation) { - Q_Q(QGraphicsAnchorLayout); - #if defined(QT_DEBUG) || defined(Q_AUTOTEST_EXPORT) lastCalculationUsedSimplex[orientation] = false; #endif + // ### This is necessary because now we do vertex simplification, we still don't know + // differentiate between invalidate()s that doesn't need resimplification and those which + // need. For example, when size hint of an item changes, this may cause an anchor to reach 0 or to + // leave 0 and get a size. In both cases we need resimplify. + // + // ### one possible solution would be tracking all the 0-sized anchors, if this set change, we need + // resimplify. + restoreSimplifiedGraph(orientation); + // Reset the nominal sizes of each anchor based on the current item sizes. This function // works with both simplified and non-simplified graphs, so it'll work when the // simplification is going to be reused. @@ -1768,12 +2091,12 @@ void QGraphicsAnchorLayoutPrivate::calculateGraphs( // Now run the simplex solver to calculate Minimum, Preferred and Maximum sizes // of the "trunk" set of constraints and variables. // ### does trunk always exist? empty = trunk is the layout left->center->right - QList<QSimplexConstraint *> trunkConstraints = parts[0]; + QList<QSimplexConstraint *> trunkConstraints = parts.at(0); QList<AnchorData *> trunkVariables = getVariables(trunkConstraints); // For minimum and maximum, use the path between the two layout sides as the // objective function. - AnchorVertex *v = internalVertex(q, pickEdge(Qt::AnchorRight, orientation)); + AnchorVertex *v = layoutLastVertex[orientation]; GraphPath trunkPath = graphPaths[orientation].value(v); bool feasible = calculateTrunk(orientation, trunkPath, trunkConstraints, trunkVariables); @@ -1787,7 +2110,7 @@ void QGraphicsAnchorLayoutPrivate::calculateGraphs( if (!feasible) break; - QList<QSimplexConstraint *> partConstraints = parts[i]; + QList<QSimplexConstraint *> partConstraints = parts.at(i); QList<AnchorData *> partVariables = getVariables(partConstraints); Q_ASSERT(!partVariables.isEmpty()); feasible &= calculateNonTrunk(partConstraints, partVariables); @@ -1836,27 +2159,19 @@ bool QGraphicsAnchorLayoutPrivate::calculateTrunk(Orientation orientation, const if (feasible) { solvePreferred(allConstraints, variables); - // Note that we don't include the sizeHintConstraints, since they - // have a different logic for solveExpanding(). - solveExpanding(constraints, variables); - - // Calculate and set the preferred and expanding sizes for the layout, + // Calculate and set the preferred size for the layout, // from the edge sizes that were calculated above. qreal pref(0.0); - qreal expanding(0.0); foreach (const AnchorData *ad, path.positives) { pref += ad->sizeAtPreferred; - expanding += ad->sizeAtExpanding; } foreach (const AnchorData *ad, path.negatives) { pref -= ad->sizeAtPreferred; - expanding -= ad->sizeAtExpanding; } sizeHints[orientation][Qt::MinimumSize] = min; sizeHints[orientation][Qt::PreferredSize] = pref; sizeHints[orientation][Qt::MaximumSize] = max; - sizeAtExpanding[orientation] = expanding; } qDeleteAll(sizeHintConstraints); @@ -1870,13 +2185,11 @@ bool QGraphicsAnchorLayoutPrivate::calculateTrunk(Orientation orientation, const AnchorData *ad = path.positives.toList()[0]; ad->sizeAtMinimum = ad->minSize; ad->sizeAtPreferred = ad->prefSize; - ad->sizeAtExpanding = ad->expSize; ad->sizeAtMaximum = ad->maxSize; sizeHints[orientation][Qt::MinimumSize] = ad->sizeAtMinimum; sizeHints[orientation][Qt::PreferredSize] = ad->sizeAtPreferred; sizeHints[orientation][Qt::MaximumSize] = ad->sizeAtMaximum; - sizeAtExpanding[orientation] = ad->sizeAtExpanding; } #if defined(QT_DEBUG) || defined(Q_AUTOTEST_EXPORT) @@ -1899,10 +2212,9 @@ bool QGraphicsAnchorLayoutPrivate::calculateNonTrunk(const QList<QSimplexConstra // Propagate size at preferred to other sizes. Semi-floats always will be // in their sizeAtPreferred. for (int j = 0; j < variables.count(); ++j) { - AnchorData *ad = variables[j]; + AnchorData *ad = variables.at(j); Q_ASSERT(ad); ad->sizeAtMinimum = ad->sizeAtPreferred; - ad->sizeAtExpanding = ad->sizeAtPreferred; ad->sizeAtMaximum = ad->sizeAtPreferred; } } @@ -1955,7 +2267,7 @@ void QGraphicsAnchorLayoutPrivate::findPaths(Orientation orientation) QSet<AnchorData *> visited; - AnchorVertex *root = graph[orientation].rootVertex(); + AnchorVertex *root = layoutFirstVertex[orientation]; graphPaths[orientation].insert(root, GraphPath()); @@ -2013,7 +2325,7 @@ void QGraphicsAnchorLayoutPrivate::constraintsFromPaths(Orientation orientation) QList<GraphPath> pathsToVertex = graphPaths[orientation].values(vertex); for (int i = 1; i < valueCount; ++i) { constraints[orientation] += \ - pathsToVertex[0].constraint(pathsToVertex[i]); + pathsToVertex[0].constraint(pathsToVertex.at(i)); } } } @@ -2041,9 +2353,37 @@ void QGraphicsAnchorLayoutPrivate::updateAnchorSizes(Orientation orientation) QList<QSimplexConstraint *> QGraphicsAnchorLayoutPrivate::constraintsFromSizeHints( const QList<AnchorData *> &anchors) { + if (anchors.isEmpty()) + return QList<QSimplexConstraint *>(); + + // Look for the layout edge. That can be either the first half in case the + // layout is split in two, or the whole layout anchor. + Orientation orient = Orientation(anchors.first()->orientation); + AnchorData *layoutEdge = 0; + if (layoutCentralVertex[orient]) { + layoutEdge = graph[orient].edgeData(layoutFirstVertex[orient], layoutCentralVertex[orient]); + } else { + layoutEdge = graph[orient].edgeData(layoutFirstVertex[orient], layoutLastVertex[orient]); + + // If maxSize is less then "infinite", that means there are other anchors + // grouped together with this one. We can't ignore its maximum value so we + // set back the variable to NULL to prevent the continue condition from being + // satisfied in the loop below. + if (layoutEdge->maxSize < QWIDGETSIZE_MAX) + layoutEdge = 0; + } + + // For each variable, create constraints based on size hints QList<QSimplexConstraint *> anchorConstraints; + bool unboundedProblem = true; for (int i = 0; i < anchors.size(); ++i) { - AnchorData *ad = anchors[i]; + AnchorData *ad = anchors.at(i); + + // Anchors that have their size directly linked to another one don't need constraints + // For exammple, the second half of an item has exactly the same size as the first half + // thus constraining the latter is enough. + if (ad->dependency == AnchorData::Slave) + continue; if ((ad->minSize == ad->maxSize) || qFuzzyCompare(ad->minSize, ad->maxSize)) { QSimplexConstraint *c = new QSimplexConstraint; @@ -2051,6 +2391,7 @@ QList<QSimplexConstraint *> QGraphicsAnchorLayoutPrivate::constraintsFromSizeHin c->constant = ad->minSize; c->ratio = QSimplexConstraint::Equal; anchorConstraints += c; + unboundedProblem = false; } else { QSimplexConstraint *c = new QSimplexConstraint; c->variables.insert(ad, 1.0); @@ -2058,14 +2399,30 @@ QList<QSimplexConstraint *> QGraphicsAnchorLayoutPrivate::constraintsFromSizeHin c->ratio = QSimplexConstraint::MoreOrEqual; anchorConstraints += c; + // We avoid adding restrictions to the layout internal anchors. That's + // to prevent unnecessary fair distribution from happening due to this + // artificial restriction. + if (ad == layoutEdge) + continue; + c = new QSimplexConstraint; c->variables.insert(ad, 1.0); c->constant = ad->maxSize; c->ratio = QSimplexConstraint::LessOrEqual; anchorConstraints += c; + unboundedProblem = false; } } + // If no upper boundary restriction was added, add one to avoid unbounded problem + if (unboundedProblem) { + QSimplexConstraint *c = new QSimplexConstraint; + c->variables.insert(layoutEdge, 1.0); + c->constant = QWIDGETSIZE_MAX; + c->ratio = QSimplexConstraint::LessOrEqual; + anchorConstraints += c; + } + return anchorConstraints; } @@ -2075,38 +2432,26 @@ QList<QSimplexConstraint *> QGraphicsAnchorLayoutPrivate::constraintsFromSizeHin QList< QList<QSimplexConstraint *> > QGraphicsAnchorLayoutPrivate::getGraphParts(Orientation orientation) { - Q_Q(QGraphicsAnchorLayout); + Q_ASSERT(layoutFirstVertex[orientation] && layoutLastVertex[orientation]); - // Find layout vertices and edges for the current orientation. - AnchorVertex *layoutFirstVertex = \ - internalVertex(q, pickEdge(Qt::AnchorLeft, orientation)); - - AnchorVertex *layoutCentralVertex = \ - internalVertex(q, pickEdge(Qt::AnchorHorizontalCenter, orientation)); - - AnchorVertex *layoutLastVertex = \ - internalVertex(q, pickEdge(Qt::AnchorRight, orientation)); - - Q_ASSERT(layoutFirstVertex && layoutLastVertex); - - AnchorData *edgeL1 = NULL; - AnchorData *edgeL2 = NULL; + AnchorData *edgeL1 = 0; + AnchorData *edgeL2 = 0; // The layout may have a single anchor between Left and Right or two half anchors // passing through the center - if (layoutCentralVertex) { - edgeL1 = graph[orientation].edgeData(layoutFirstVertex, layoutCentralVertex); - edgeL2 = graph[orientation].edgeData(layoutCentralVertex, layoutLastVertex); + if (layoutCentralVertex[orientation]) { + edgeL1 = graph[orientation].edgeData(layoutFirstVertex[orientation], layoutCentralVertex[orientation]); + edgeL2 = graph[orientation].edgeData(layoutCentralVertex[orientation], layoutLastVertex[orientation]); } else { - edgeL1 = graph[orientation].edgeData(layoutFirstVertex, layoutLastVertex); + edgeL1 = graph[orientation].edgeData(layoutFirstVertex[orientation], layoutLastVertex[orientation]); } QLinkedList<QSimplexConstraint *> remainingConstraints; for (int i = 0; i < constraints[orientation].count(); ++i) { - remainingConstraints += constraints[orientation][i]; + remainingConstraints += constraints[orientation].at(i); } for (int i = 0; i < itemCenterConstraints[orientation].count(); ++i) { - remainingConstraints += itemCenterConstraints[orientation][i]; + remainingConstraints += itemCenterConstraints[orientation].at(i); } QList<QSimplexConstraint *> trunkConstraints; @@ -2276,6 +2621,21 @@ void QGraphicsAnchorLayoutPrivate::setItemsGeometries(const QRectF &geom) } /*! + \internal + + Fill the distance in the vertex and in the sub-vertices if its a combined vertex. +*/ +static void setVertexDistance(AnchorVertex *v, qreal distance) +{ + v->distance = distance; + if (v->m_type == AnchorVertex::Pair) { + AnchorVertexPair *pair = static_cast<AnchorVertexPair *>(v); + setVertexDistance(pair->m_first, distance); + setVertexDistance(pair->m_second, distance); + } +} + +/*! \internal Calculate the position of each vertex based on the paths to each of @@ -2288,9 +2648,9 @@ void QGraphicsAnchorLayoutPrivate::calculateVertexPositions( QSet<AnchorVertex *> visited; // Get root vertex - AnchorVertex *root = graph[orientation].rootVertex(); + AnchorVertex *root = layoutFirstVertex[orientation]; - root->distance = 0; + setVertexDistance(root, 0); visited.insert(root); // Add initial edges to the queue @@ -2314,7 +2674,7 @@ void QGraphicsAnchorLayoutPrivate::calculateVertexPositions( continue; visited.insert(pair.second); - interpolateEdge(pair.first, edge, orientation); + interpolateEdge(pair.first, edge); QList<AnchorVertex *> adjacents = graph[orientation].adjacentVertices(pair.second); for (int i = 0; i < adjacents.count(); ++i) { @@ -2343,7 +2703,6 @@ void QGraphicsAnchorLayoutPrivate::setupEdgesInterpolation( result = getFactor(current, sizeHints[orientation][Qt::MinimumSize], sizeHints[orientation][Qt::PreferredSize], - sizeAtExpanding[orientation], sizeHints[orientation][Qt::MaximumSize]); interpolationInterval[orientation] = result.first; @@ -2358,7 +2717,6 @@ void QGraphicsAnchorLayoutPrivate::setupEdgesInterpolation( - minimum size, - preferred size, - - size when all expanding anchors are expanded, - maximum size. These three key values are calculated in advance using linear @@ -2370,36 +2728,32 @@ void QGraphicsAnchorLayoutPrivate::setupEdgesInterpolation( vertices to be initalized, so it calls specialized functions that will recurse back to interpolateEdge(). */ -void QGraphicsAnchorLayoutPrivate::interpolateEdge(AnchorVertex *base, - AnchorData *edge, - Orientation orientation) +void QGraphicsAnchorLayoutPrivate::interpolateEdge(AnchorVertex *base, AnchorData *edge) { + const Orientation orientation = Orientation(edge->orientation); const QPair<Interval, qreal> factor(interpolationInterval[orientation], interpolationProgress[orientation]); qreal edgeDistance = interpolate(factor, edge->sizeAtMinimum, edge->sizeAtPreferred, - edge->sizeAtExpanding, edge->sizeAtMaximum); + edge->sizeAtMaximum); Q_ASSERT(edge->from == base || edge->to == base); - if (edge->from == base) - edge->to->distance = base->distance + edgeDistance; - else - edge->from->distance = base->distance - edgeDistance; + // Calculate the distance for the vertex opposite to the base + if (edge->from == base) { + setVertexDistance(edge->to, base->distance + edgeDistance); + } else { + setVertexDistance(edge->from, base->distance - edgeDistance); + } // Process child anchors if (edge->type == AnchorData::Sequential) - interpolateSequentialEdges(edge->from, - static_cast<SequentialAnchorData *>(edge), - orientation); + interpolateSequentialEdges(static_cast<SequentialAnchorData *>(edge)); else if (edge->type == AnchorData::Parallel) - interpolateParallelEdges(edge->from, - static_cast<ParallelAnchorData *>(edge), - orientation); + interpolateParallelEdges(static_cast<ParallelAnchorData *>(edge)); } -void QGraphicsAnchorLayoutPrivate::interpolateParallelEdges( - AnchorVertex *base, ParallelAnchorData *data, Orientation orientation) +void QGraphicsAnchorLayoutPrivate::interpolateParallelEdges(ParallelAnchorData *data) { // In parallels the boundary vertices are already calculate, we // just need to look for sequential groups inside, because only @@ -2407,46 +2761,44 @@ void QGraphicsAnchorLayoutPrivate::interpolateParallelEdges( // First edge if (data->firstEdge->type == AnchorData::Sequential) - interpolateSequentialEdges(base, - static_cast<SequentialAnchorData *>(data->firstEdge), - orientation); + interpolateSequentialEdges(static_cast<SequentialAnchorData *>(data->firstEdge)); else if (data->firstEdge->type == AnchorData::Parallel) - interpolateParallelEdges(base, - static_cast<ParallelAnchorData *>(data->firstEdge), - orientation); + interpolateParallelEdges(static_cast<ParallelAnchorData *>(data->firstEdge)); // Second edge if (data->secondEdge->type == AnchorData::Sequential) - interpolateSequentialEdges(base, - static_cast<SequentialAnchorData *>(data->secondEdge), - orientation); + interpolateSequentialEdges(static_cast<SequentialAnchorData *>(data->secondEdge)); else if (data->secondEdge->type == AnchorData::Parallel) - interpolateParallelEdges(base, - static_cast<ParallelAnchorData *>(data->secondEdge), - orientation); + interpolateParallelEdges(static_cast<ParallelAnchorData *>(data->secondEdge)); } -void QGraphicsAnchorLayoutPrivate::interpolateSequentialEdges( - AnchorVertex *base, SequentialAnchorData *data, Orientation orientation) +void QGraphicsAnchorLayoutPrivate::interpolateSequentialEdges(SequentialAnchorData *data) { - AnchorVertex *prev = base; + // This method is supposed to handle any sequential anchor, even out-of-order + // ones. However, in the current QGAL implementation we should get only the + // well behaved ones. + Q_ASSERT(data->m_edges.first()->from == data->from); + Q_ASSERT(data->m_edges.last()->to == data->to); - // ### I'm not sure whether this assumption is safe. If not, - // consider that m_edges.last() could be used instead (so - // at(0) would be the one to be treated specially). - Q_ASSERT(base == data->m_edges.at(0)->to || base == data->m_edges.at(0)->from); + // At this point, the two outter vertices already have their distance + // calculated. + // We use the first as the base to calculate the internal ones + + AnchorVertex *prev = data->from; - // Skip the last for (int i = 0; i < data->m_edges.count() - 1; ++i) { - AnchorData *child = data->m_edges.at(i); - interpolateEdge(prev, child, orientation); - prev = child->to; + AnchorData *edge = data->m_edges.at(i); + interpolateEdge(prev, edge); + + // Use the recently calculated vertex as the base for the next one + const bool edgeIsForward = (edge->from == prev); + prev = edgeIsForward ? edge->to : edge->from; } // Treat the last specially, since we already calculated it's end // vertex, so it's only interesting if it's a complex one if (data->m_edges.last()->type != AnchorData::Normal) - interpolateEdge(prev, data->m_edges.last(), orientation); + interpolateEdge(prev, data->m_edges.last()); } bool QGraphicsAnchorLayoutPrivate::solveMinMax(const QList<QSimplexConstraint *> &constraints, @@ -2472,9 +2824,10 @@ bool QGraphicsAnchorLayoutPrivate::solveMinMax(const QList<QSimplexConstraint *> // Save sizeAtMinimum results QList<AnchorData *> variables = getVariables(constraints); for (int i = 0; i < variables.size(); ++i) { - AnchorData *ad = static_cast<AnchorData *>(variables[i]); - Q_ASSERT(ad->result >= ad->minSize || qFuzzyCompare(ad->result, ad->minSize)); + AnchorData *ad = static_cast<AnchorData *>(variables.at(i)); ad->sizeAtMinimum = ad->result; + Q_ASSERT(ad->sizeAtMinimum >= ad->minSize || + qAbs(ad->sizeAtMinimum - ad->minSize) < 0.00000001); } // Calculate maximum values @@ -2482,9 +2835,10 @@ bool QGraphicsAnchorLayoutPrivate::solveMinMax(const QList<QSimplexConstraint *> // Save sizeAtMaximum results for (int i = 0; i < variables.size(); ++i) { - AnchorData *ad = static_cast<AnchorData *>(variables[i]); - Q_ASSERT(ad->result <= ad->maxSize || qFuzzyCompare(ad->result, ad->maxSize)); + AnchorData *ad = static_cast<AnchorData *>(variables.at(i)); ad->sizeAtMaximum = ad->result; + // Q_ASSERT(ad->sizeAtMaximum <= ad->maxSize || + // qAbs(ad->sizeAtMaximum - ad->maxSize) < 0.00000001); } } return feasible; @@ -2515,7 +2869,7 @@ bool QGraphicsAnchorLayoutPrivate::solvePreferred(const QList<QSimplexConstraint // A + A_shrinker - A_grower = A_pref // for (int i = 0; i < variables.size(); ++i) { - AnchorData *ad = variables[i]; + AnchorData *ad = variables.at(i); if (ad->skipInPreferred) continue; @@ -2546,7 +2900,7 @@ bool QGraphicsAnchorLayoutPrivate::solvePreferred(const QList<QSimplexConstraint // Save sizeAtPreferred results for (int i = 0; i < variables.size(); ++i) { - AnchorData *ad = variables[i]; + AnchorData *ad = variables.at(i); ad->sizeAtPreferred = ad->result; } @@ -2563,139 +2917,6 @@ bool QGraphicsAnchorLayoutPrivate::solvePreferred(const QList<QSimplexConstraint /*! \internal - Calculate the "expanding" keyframe - - This new keyframe sits between the already existing sizeAtPreferred and - sizeAtMaximum keyframes. Its goal is to modify the interpolation between - the latter as to respect the "expanding" size policy of some anchors. - - Previously all items would be subject to a linear interpolation between - sizeAtPreferred and sizeAtMaximum values. This will change now, the - expanding anchors will change their size before the others. To calculate - this keyframe we use the following logic: - - 1) Ask each anchor for their desired expanding size (ad->expSize), this - value depends on the anchor expanding property in the following way: - - - Expanding normal anchors want to grow towards their maximum size - - Non-expanding normal anchors want to remain at their preferred size. - - Sequential anchors wants to grow towards a size that is calculated by: - summarizing it's child anchors, where it will use preferred size for non-expanding anchors - and maximum size for expanding anchors. - - Parallel anchors want to grow towards the smallest maximum size of all the expanding anchors. - - 2) Clamp their desired values to the value they assume in the neighbour - keyframes (sizeAtPreferred and sizeAtExpanding) - - 3) Run simplex with a setup that ensures the following: - - a. Anchors will change their value from their sizeAtPreferred towards - their sizeAtMaximum as much as required to ensure that ALL anchors - reach their respective "desired" expanding sizes. - - b. No anchors will change their value beyond what is NEEDED to satisfy - the requirement above. - - The final result is that, at the "expanding" keyframe expanding anchors - will grow and take with them all anchors that are parallel to them. - However, non-expanding anchors will remain at their preferred size unless - they are forced to grow by a parallel expanding anchor. - - Note: For anchors where the sizeAtPreferred is bigger than sizeAtMaximum, - the visual effect when the layout grows from its preferred size is - the following: Expanding anchors will keep their size while non - expanding ones will shrink. Only after non-expanding anchors have - shrinked all the way, the expanding anchors will start to shrink too. -*/ -void QGraphicsAnchorLayoutPrivate::solveExpanding(const QList<QSimplexConstraint *> &constraints, - const QList<AnchorData *> &variables) -{ - QList<QSimplexConstraint *> itemConstraints; - QSimplexConstraint *objective = new QSimplexConstraint; - bool hasExpanding = false; - - // Construct the simplex constraints and objective - for (int i = 0; i < variables.size(); ++i) { - // For each anchor - AnchorData *ad = variables[i]; - - // Clamp the desired expanding size - qreal upperBoundary = qMax(ad->sizeAtPreferred, ad->sizeAtMaximum); - qreal lowerBoundary = qMin(ad->sizeAtPreferred, ad->sizeAtMaximum); - qreal boundedExpSize = qBound(lowerBoundary, ad->expSize, upperBoundary); - - // Expanding anchors are those that want to move from their preferred size - if (boundedExpSize != ad->sizeAtPreferred) - hasExpanding = true; - - // Lock anchor between boundedExpSize and sizeAtMaximum (ensure 3.a) - if (boundedExpSize == ad->sizeAtMaximum || qFuzzyCompare(boundedExpSize, ad->sizeAtMaximum)) { - // The interval has only one possible value, we can use an "Equal" - // constraint and don't need to add this variable to the objective. - QSimplexConstraint *itemC = new QSimplexConstraint; - itemC->ratio = QSimplexConstraint::Equal; - itemC->variables.insert(ad, 1.0); - itemC->constant = boundedExpSize; - itemConstraints << itemC; - } else { - // Add MoreOrEqual and LessOrEqual constraints. - QSimplexConstraint *itemC = new QSimplexConstraint; - itemC->ratio = QSimplexConstraint::MoreOrEqual; - itemC->variables.insert(ad, 1.0); - itemC->constant = qMin(boundedExpSize, ad->sizeAtMaximum); - itemConstraints << itemC; - - itemC = new QSimplexConstraint; - itemC->ratio = QSimplexConstraint::LessOrEqual; - itemC->variables.insert(ad, 1.0); - itemC->constant = qMax(boundedExpSize, ad->sizeAtMaximum); - itemConstraints << itemC; - - // Create objective to avoid the anchors from moving away from - // the preferred size more than the needed amount. (ensure 3.b) - // The objective function is the distance between sizeAtPreferred - // and sizeAtExpanding, it will be minimized. - if (ad->sizeAtExpanding < ad->sizeAtMaximum) { - // Try to shrink this variable towards its sizeAtPreferred value - objective->variables.insert(ad, 1.0); - } else { - // Try to grow this variable towards its sizeAtPreferred value - objective->variables.insert(ad, -1.0); - } - } - } - - // Solve - if (hasExpanding == false) { - // If no anchors are expanding, we don't need to run the simplex - // Set all variables to their preferred size - for (int i = 0; i < variables.size(); ++i) { - variables[i]->sizeAtExpanding = variables[i]->sizeAtPreferred; - } - } else { - // Run simplex - QSimplex simplex; - - // Satisfy expanding (3.a) - bool feasible = simplex.setConstraints(constraints + itemConstraints); - Q_ASSERT(feasible); - - // Reduce damage (3.b) - simplex.setObjective(objective); - simplex.solveMin(); - - // Collect results - for (int i = 0; i < variables.size(); ++i) { - variables[i]->sizeAtExpanding = variables[i]->result; - } - } - - delete objective; - qDeleteAll(itemConstraints); -} - -/*! - \internal Returns true if there are no arrangement that satisfies all constraints. Otherwise returns false. |