diff options
| -rw-r--r-- | src/gui/graphicsview/qgraphicsanchorlayout_p.cpp | 51 |
1 files changed, 35 insertions, 16 deletions
diff --git a/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp b/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp index 4ee58d1..9114fc3 100644 --- a/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp +++ b/src/gui/graphicsview/qgraphicsanchorlayout_p.cpp @@ -633,16 +633,25 @@ AnchorData *QGraphicsAnchorLayoutPrivate::addAnchorMaybeParallel(AnchorData *new AnchorData *child = children[i]; QList<QSimplexConstraint *> *childConstraints = childrenConstraints[i]; + // We need to fix the second child constraints if the parallel group will have the + // opposite direction of the second child anchor. For the point of view of external + // entities, this anchor was reversed. So if at some point we say that the parallel + // has a value of 20, this mean that the second child (when reversed) will be + // assigned -20. + const bool needsReverse = i == 1 && !parallel->secondForward(); + if (!child->isCenterAnchor) continue; parallel->isCenterAnchor = true; - for (int i = 0; i < constraints.count(); ++i) { - QSimplexConstraint *c = constraints[i]; + for (int j = 0; j < constraints.count(); ++j) { + QSimplexConstraint *c = constraints[j]; if (c->variables.contains(child)) { childConstraints->append(c); qreal v = c->variables.take(child); + if (needsReverse) + v *= -1; c->variables.insert(parallel, v); } } @@ -1165,9 +1174,15 @@ void QGraphicsAnchorLayoutPrivate::restoreSimplifiedConstraints(ParallelAnchorDa c->variables.insert(parallel->firstEdge, v); } + // When restoring, we might have to revert constraints back. See comments on + // addAnchorMaybeParallel(). + const bool needsReverse = !parallel->secondForward(); + for (int i = 0; i < parallel->m_secondConstraints.count(); ++i) { QSimplexConstraint *c = parallel->m_secondConstraints.at(i); qreal v = c->variables[parallel]; + if (needsReverse) + v *= -1; c->variables.remove(parallel); c->variables.insert(parallel->secondEdge, v); } @@ -1209,7 +1224,24 @@ void QGraphicsAnchorLayoutPrivate::restoreVertices(Orientation orientation) 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 + // Since we keep a list of parallel anchors and vertices that were created during vertex + // simplification, we can now iterate on those lists instead of traversing the graph + // recursively. + + // First, restore the constraints changed when we created parallel anchors. Note that this + // works at this point because the constraints doesn't depend on vertex information and at + // this point it's always safe to identify whether the second child is forward or backwards. + // In the next step, we'll change the anchors vertices so that would not be possible anymore. + 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(); + + // Then, 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); @@ -1254,19 +1286,6 @@ void QGraphicsAnchorLayoutPrivate::restoreVertices(Orientation orientation) 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 |