diff options
Diffstat (limited to 'src/gui/graphicsview/qgraphicsview.cpp')
| -rw-r--r-- | src/gui/graphicsview/qgraphicsview.cpp | 360 |
1 files changed, 110 insertions, 250 deletions
diff --git a/src/gui/graphicsview/qgraphicsview.cpp b/src/gui/graphicsview/qgraphicsview.cpp index e8330a9117..e3e5723103 100644 --- a/src/gui/graphicsview/qgraphicsview.cpp +++ b/src/gui/graphicsview/qgraphicsview.cpp @@ -39,8 +39,6 @@ ** ****************************************************************************/ -//#define QGRAPHICSVIEW_DEBUG - static const int QGRAPHICSVIEW_REGION_RECT_THRESHOLD = 50; static const int QGRAPHICSVIEW_PREALLOC_STYLE_OPTIONS = 503; // largest prime < 2^9 @@ -329,8 +327,6 @@ QGraphicsViewPrivate::QGraphicsViewPrivate() #endif lastDragDropEvent(0), fullUpdatePending(true), - dirtyRectCount(0), - updatingLater(false), updateSceneSlotReimplementedChecked(false) { styleOptions.reserve(QGRAPHICSVIEW_PREALLOC_STYLE_OPTIONS); @@ -391,7 +387,7 @@ void QGraphicsViewPrivate::recalculateContentSize() int left = q_round_bound(viewRect.left()); int right = q_round_bound(viewRect.right() - width); if (left >= right) { - q->horizontalScrollBar()->setRange(0, 0); + hbar->setRange(0, 0); switch (alignment & Qt::AlignHorizontal_Mask) { case Qt::AlignLeft: @@ -406,9 +402,9 @@ void QGraphicsViewPrivate::recalculateContentSize() break; } } else { - q->horizontalScrollBar()->setRange(left, right); - q->horizontalScrollBar()->setPageStep(width); - q->horizontalScrollBar()->setSingleStep(width / 20); + hbar->setRange(left, right); + hbar->setPageStep(width); + hbar->setSingleStep(width / 20); leftIndent = 0; } @@ -417,7 +413,7 @@ void QGraphicsViewPrivate::recalculateContentSize() int top = q_round_bound(viewRect.top()); int bottom = q_round_bound(viewRect.bottom() - height); if (top >= bottom) { - q->verticalScrollBar()->setRange(0, 0); + vbar->setRange(0, 0); switch (alignment & Qt::AlignVertical_Mask) { case Qt::AlignTop: @@ -432,9 +428,9 @@ void QGraphicsViewPrivate::recalculateContentSize() break; } } else { - q->verticalScrollBar()->setRange(top, bottom); - q->verticalScrollBar()->setPageStep(height); - q->verticalScrollBar()->setSingleStep(height / 20); + vbar->setRange(top, bottom); + vbar->setPageStep(height); + vbar->setSingleStep(height / 20); topIndent = 0; } @@ -446,7 +442,7 @@ void QGraphicsViewPrivate::recalculateContentSize() // scroll instead. if (oldLeftIndent != leftIndent || oldTopIndent != topIndent) { dirtyScroll = true; - q->viewport()->update(); + viewport->update(); } else if (q->isRightToLeft() && !leftIndent) { // In reverse mode, the horizontal scroll always changes after the content // size has changed, as the scroll is calculated by summing the min and @@ -472,7 +468,7 @@ void QGraphicsViewPrivate::centerView(QGraphicsView::ViewportAnchor anchor) if (q->underMouse()) { // Last scene pos: lastMouseMoveScenePoint // Current mouse pos: - QPointF transformationDiff = q->mapToScene(q->viewport()->rect().center()) + QPointF transformationDiff = q->mapToScene(viewport->rect().center()) - q->mapToScene(q->mapFromGlobal(QCursor::pos())); q->centerOn(lastMouseMoveScenePoint + transformationDiff);; } else { @@ -494,7 +490,7 @@ void QGraphicsViewPrivate::centerView(QGraphicsView::ViewportAnchor anchor) void QGraphicsViewPrivate::updateLastCenterPoint() { Q_Q(QGraphicsView); - lastCenterPoint = q->mapToScene(q->viewport()->rect().center()); + lastCenterPoint = q->mapToScene(viewport->rect().center()); } /*! @@ -532,15 +528,15 @@ void QGraphicsViewPrivate::updateScroll() scrollX = qint64(-leftIndent); if (q->isRightToLeft()) { if (!leftIndent) { - scrollX += q->horizontalScrollBar()->minimum(); - scrollX += q->horizontalScrollBar()->maximum(); - scrollX -= q->horizontalScrollBar()->value(); + scrollX += hbar->minimum(); + scrollX += hbar->maximum(); + scrollX -= hbar->value(); } } else { - scrollX += q->horizontalScrollBar()->value(); + scrollX += hbar->value(); } - scrollY = qint64(q->verticalScrollBar()->value() - topIndent); + scrollY = qint64(vbar->value() - topIndent); dirtyScroll = false; } @@ -580,7 +576,7 @@ void QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent *event) return; QGraphicsSceneMouseEvent mouseEvent(QEvent::GraphicsSceneMouseMove); - mouseEvent.setWidget(q->viewport()); + mouseEvent.setWidget(viewport); mouseEvent.setButtonDownScenePos(mousePressButton, mousePressScenePoint); mouseEvent.setButtonDownScreenPos(mousePressButton, mousePressScreenPoint); mouseEvent.setScenePos(q->mapToScene(event->pos())); @@ -627,7 +623,7 @@ void QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent *event) if (hasStoredOriginalCursor) { // Restore the original viewport cursor. hasStoredOriginalCursor = false; - q->viewport()->setCursor(originalCursor); + viewport->setCursor(originalCursor); } #endif } @@ -659,8 +655,6 @@ QRegion QGraphicsViewPrivate::rubberBandRegion(const QWidget *widget, const QRec #ifndef QT_NO_CURSOR void QGraphicsViewPrivate::_q_setViewportCursor(const QCursor &cursor) { - Q_Q(QGraphicsView); - QWidget *viewport = q->viewport(); if (!hasStoredOriginalCursor) { hasStoredOriginalCursor = true; originalCursor = viewport->cursor(); @@ -686,9 +680,9 @@ void QGraphicsViewPrivate::_q_unsetViewportCursor() // Restore the original viewport cursor. hasStoredOriginalCursor = false; if (dragMode == QGraphicsView::ScrollHandDrag) - q->viewport()->setCursor(Qt::OpenHandCursor); + viewport->setCursor(Qt::OpenHandCursor); else - q->viewport()->setCursor(originalCursor); + viewport->setCursor(originalCursor); } #endif @@ -727,7 +721,7 @@ void QGraphicsViewPrivate::populateSceneDragDropEvent(QGraphicsSceneDragDropEven dest->setProposedAction(source->proposedAction()); dest->setDropAction(source->dropAction()); dest->setMimeData(source->mimeData()); - dest->setWidget(q->viewport()); + dest->setWidget(viewport); dest->setSource(source->source()); #else Q_UNUSED(dest) @@ -750,12 +744,13 @@ QRect QGraphicsViewPrivate::mapToViewRect(const QGraphicsItem *item, const QRect } // Translate-only + // COMBINE QPointF offset; const QGraphicsItem *parentItem = item; const QGraphicsItemPrivate *itemd; do { itemd = parentItem->d_ptr; - if (itemd->hasTransform) + if (itemd->transformData) break; offset += itemd->pos; } while ((parentItem = itemd->parent)); @@ -787,223 +782,103 @@ QRegion QGraphicsViewPrivate::mapToViewRegion(const QGraphicsItem *item, const Q const_cast<QGraphicsViewPrivate *>(this)->updateScroll(); // Accurate bounding region - QTransform itv = item->sceneTransform() * q->viewportTransform(); + QTransform itv = item->deviceTransform(q->viewportTransform()); return item->boundingRegion(itv) & itv.mapRect(rect).toAlignedRect(); } /*! \internal */ -void QGraphicsViewPrivate::itemUpdated(QGraphicsItem *item, const QRectF &rect) -{ - if (fullUpdatePending || viewportUpdateMode == QGraphicsView::NoViewportUpdate) - return; - if (item->d_ptr->dirty) - updateLater(); - - QRectF updateRect = rect; - if ((item->d_ptr->flags & QGraphicsItem::ItemClipsChildrenToShape) || item->d_ptr->children.isEmpty()) { - updateRect &= adjustedItemBoundingRect(item); - if (updateRect.isEmpty()) - return; - } - - QGraphicsItem *clipItem = item; - if (item->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren) { - // Minimize unnecessary redraw. - QGraphicsItem *parent = item; - while ((parent = parent->d_ptr->parent)) { - if (parent->d_ptr->flags & QGraphicsItem::ItemClipsChildrenToShape) { - // Map update rect to the current parent and itersect with its bounding rect. - updateRect = clipItem->itemTransform(parent).mapRect(updateRect) - & adjustedItemBoundingRect(parent); - if (updateRect.isEmpty()) - return; - clipItem = parent; - } - - if (!(parent->d_ptr->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren)) - break; - } - } - - // Map update rect from clipItem coordinates to view coordinates. - Q_ASSERT(clipItem); - if (!item->d_ptr->hasBoundingRegionGranularity) - this->updateRect(mapToViewRect(clipItem, updateRect) & viewport->rect()); - else - updateRegion(mapToViewRegion(clipItem, updateRect) & viewport->rect()); -} - -void QGraphicsViewPrivate::updateLater() +void QGraphicsViewPrivate::processPendingUpdates() { - Q_Q(QGraphicsView); - if (updatingLater) - return; - updatingLater = true; - QMetaObject::invokeMethod(q, "_q_updateLaterSlot", Qt::QueuedConnection); -} - -void QGraphicsViewPrivate::_q_updateLaterSlot() -{ - Q_Q(QGraphicsView); if (!scene) return; - QRect vr = viewport->rect(); - QTransform viewTransform = q->viewportTransform(); - const QList<QGraphicsItem *> &dirtyItems = scene->d_func()->dirtyItems; - for (int i = 0; i < dirtyItems.size(); ++i) { - const QGraphicsItem *item = dirtyItems.at(i); - if (item->d_ptr->discardUpdateRequest(/*ignoreClipping=*/false, - /*ignoreVisibleBit=*/false, - /*ignoreDirtyBit=*/true)) { - continue; - } - QTransform x = item->sceneTransform() * viewTransform; - updateRect(x.mapRect(item->boundingRect()).toAlignedRect() & vr); + if (fullUpdatePending) { // We have already called viewport->update() + dirtyBoundingRect = QRect(); + dirtyRegion = QRegion(); + return; } - dirtyRectCount += dirtyRects.size(); - - bool noUpdate = !fullUpdatePending && viewportUpdateMode == QGraphicsView::FullViewportUpdate; - if ((dirtyRectCount > 0 || !dirtyBoundingRect.isEmpty()) && !fullUpdatePending && !noUpdate) { - if (viewportUpdateMode == QGraphicsView::BoundingRectViewportUpdate - || (viewportUpdateMode == QGraphicsView::SmartViewportUpdate - && dirtyRectCount >= QGRAPHICSVIEW_REGION_RECT_THRESHOLD)) { - if (!(optimizationFlags & QGraphicsView::DontAdjustForAntialiasing)) { - viewport->update(dirtyBoundingRect.adjusted(-2, -2, 2, 2)); - } else { - viewport->update(dirtyBoundingRect); - } - } else { - // ### Improve this block, which is very slow for complex regions. We - // need to strike the balance between having an accurate update - // region, and running fast. The below approach is the simplest way to - // create a region from a bunch of rects, but we might want to use - // other approaches; e.g., a grid of a fixed size representing - // quadrants of the viewport, which we mark as dirty depending on the - // rectangles in the list. Perhaps this should go into a - // QRegion::fromRects(rects, how) function. - QRegion region; - if (!(optimizationFlags & QGraphicsView::DontAdjustForAntialiasing)) { - for (int i = 0; i < dirtyRegions.size(); ++i) { - QVector<QRect> rects = dirtyRegions.at(i).rects(); - for (int j = 0; j < rects.size(); ++j) - region += rects.at(j).adjusted(-2, -2, 2, 2); - } - for (int i = 0; i < dirtyRects.size(); ++i) - region += dirtyRects.at(i).adjusted(-2, -2, 2, 2); - } else { - for (int i = 0; i < dirtyRegions.size(); ++i) - region += dirtyRegions.at(i); - for (int i = 0; i < dirtyRects.size(); ++i) - region += dirtyRects.at(i); - } - - viewport->update(region); - } + if (viewportUpdateMode == QGraphicsView::BoundingRectViewportUpdate) { + if (optimizationFlags & QGraphicsView::DontAdjustForAntialiasing) + viewport->update(dirtyBoundingRect); + else + viewport->update(dirtyBoundingRect.adjusted(-2, -2, 2, 2)); + } else { + viewport->update(dirtyRegion); // Already adjusted in updateRect/Region. } - dirtyRegions.clear(); - dirtyRects.clear(); - dirtyRectCount = 0; dirtyBoundingRect = QRect(); - updatingLater = false; + dirtyRegion = QRegion(); } void QGraphicsViewPrivate::updateAll() { - Q_Q(QGraphicsView); - q->viewport()->update(); + viewport->update(); fullUpdatePending = true; - dirtyRectCount = 0; dirtyBoundingRect = QRect(); - updatingLater = false; + dirtyRegion = QRegion(); } void QGraphicsViewPrivate::updateRegion(const QRegion &r) { - if (r.isEmpty()) + if (r.isEmpty() || fullUpdatePending) return; - Q_Q(QGraphicsView); - // Rect intersects viewport - update everything? switch (viewportUpdateMode) { case QGraphicsView::FullViewportUpdate: fullUpdatePending = true; - q->viewport()->update(); + viewport->update(); break; case QGraphicsView::BoundingRectViewportUpdate: dirtyBoundingRect |= r.boundingRect(); - if (dirtyBoundingRect == q->viewport()->rect()) { + if (dirtyBoundingRect.contains(viewport->rect())) { fullUpdatePending = true; - q->viewport()->update(); - } else { - updateLater(); + viewport->update(); } break; - case QGraphicsView::SmartViewportUpdate: - dirtyBoundingRect |= r.boundingRect(); - if ((dirtyRectCount + r.numRects()) < QGRAPHICSVIEW_REGION_RECT_THRESHOLD) - dirtyRegions << r; - dirtyRectCount += r.numRects(); - updateLater(); - break; + case QGraphicsView::SmartViewportUpdate: // ### DEPRECATE case QGraphicsView::MinimalViewportUpdate: - dirtyRegions << r; - dirtyRectCount += r.numRects(); - updateLater(); + if (optimizationFlags & QGraphicsView::DontAdjustForAntialiasing) { + dirtyRegion += r; + } else { + const QVector<QRect> &rects = r.rects(); + for (int i = 0; i < rects.size(); ++i) + dirtyRegion += rects.at(i).adjusted(-2, -2, 2, 2); + } break; case QGraphicsView::NoViewportUpdate: // Unreachable break; } - - // Compress the regions... - if (dirtyRectCount > QGRAPHICSVIEW_REGION_RECT_THRESHOLD && dirtyRegions.size() > 1) { - QRegion masterRegion; - for (int i=0; i<dirtyRegions.size(); ++i) { - masterRegion |= dirtyRegions.at(i); - } - dirtyRectCount = masterRegion.numRects(); - dirtyRegions.clear(); - dirtyRegions << masterRegion; - } } void QGraphicsViewPrivate::updateRect(const QRect &r) { - if (r.isEmpty()) + if (r.isEmpty() || fullUpdatePending) return; - Q_Q(QGraphicsView); - // Rect intersects viewport - update everything? switch (viewportUpdateMode) { case QGraphicsView::FullViewportUpdate: fullUpdatePending = true; - q->viewport()->update(); + viewport->update(); break; case QGraphicsView::BoundingRectViewportUpdate: dirtyBoundingRect |= r; - if (dirtyBoundingRect == q->viewport()->rect()) { + if (dirtyBoundingRect.contains(viewport->rect())) { fullUpdatePending = true; - q->viewport()->update(); - } else { - updateLater(); + viewport->update(); } break; - case QGraphicsView::SmartViewportUpdate: - dirtyBoundingRect |= r; - if ((dirtyRectCount + dirtyRects.size()) < QGRAPHICSVIEW_REGION_RECT_THRESHOLD) - dirtyRects << r; - updateLater(); - break; + case QGraphicsView::SmartViewportUpdate: // ### DEPRECATE case QGraphicsView::MinimalViewportUpdate: - dirtyRects << r; - updateLater(); + if (optimizationFlags & QGraphicsView::DontAdjustForAntialiasing) + dirtyRegion += r; + else + dirtyRegion += r.adjusted(-2, -2, 2, 2); break; case QGraphicsView::NoViewportUpdate: // Unreachable @@ -2595,9 +2470,11 @@ void QGraphicsView::updateScene(const QList<QRectF> &rects) // Extract and reset dirty scene rect info. QVector<QRect> dirtyViewportRects; - for (int i = 0; i < d->dirtyRegions.size(); ++i) - dirtyViewportRects += d->dirtyRegions.at(i).rects(); - d->dirtyRegions.clear(); + const QVector<QRect> &dirtyRects = d->dirtyRegion.rects(); + for (int i = 0; i < dirtyRects.size(); ++i) + dirtyViewportRects += dirtyRects.at(i); + d->dirtyRegion = QRegion(); + d->dirtyBoundingRect = QRect(); bool fullUpdate = !d->accelerateScrolling || d->viewportUpdateMode == QGraphicsView::FullViewportUpdate; bool boundingRectUpdate = (d->viewportUpdateMode == QGraphicsView::BoundingRectViewportUpdate) @@ -3337,16 +3214,15 @@ void QGraphicsView::paintEvent(QPaintEvent *event) d->scene->d_func()->painterStateProtection = !(d->optimizationFlags & DontSavePainterState); // Determine the exposed region - QRegion exposedRegion = event->region(); + d->exposedRegion = event->region(); if (!d->accelerateScrolling) - exposedRegion = viewport()->rect(); + d->exposedRegion = viewport()->rect(); else if (d->viewportUpdateMode == BoundingRectViewportUpdate) - exposedRegion = event->rect(); - QRectF exposedSceneRect = mapToScene(exposedRegion.boundingRect()).boundingRect(); + d->exposedRegion = event->rect(); + QRectF exposedSceneRect = mapToScene(d->exposedRegion.boundingRect()).boundingRect(); // Set up the painter QPainter painter(viewport()); - QTransform original = painter.worldTransform(); #ifndef QT_NO_RUBBERBAND if (d->rubberBanding && !d->rubberBandRect.isEmpty()) painter.save(); @@ -3357,22 +3233,9 @@ void QGraphicsView::paintEvent(QPaintEvent *event) // Set up viewport transform const QTransform viewTransform = viewportTransform(); - painter.setTransform(viewTransform, true); - -#ifdef QGRAPHICSVIEW_DEBUG - QTime stopWatch; - stopWatch.start(); - qDebug() << "QGraphicsView::paintEvent(" << exposedRegion << ')'; -#endif - - // Find all exposed items - bool allItems = false; - QList<QGraphicsItem *> itemList = d->findItems(exposedRegion, &allItems); - -#ifdef QGRAPHICSVIEW_DEBUG - int exposedTime = stopWatch.elapsed(); -#endif + painter.setWorldTransform(viewTransform); + // Draw background if ((d->cacheMode & CacheBackground) #ifdef Q_WS_X11 && X11->use_xrender @@ -3402,10 +3265,9 @@ void QGraphicsView::paintEvent(QPaintEvent *event) } // Blit the background from the background pixmap - QTransform oldMatrix = painter.worldTransform(); - painter.setWorldTransform(original); + painter.setWorldTransform(QTransform()); painter.drawPixmap(QPoint(), d->backgroundPixmap); - painter.setWorldTransform(oldMatrix); + painter.setWorldTransform(viewTransform); } else { if (!(d->optimizationFlags & DontSavePainterState)) painter.save(); @@ -3414,33 +3276,31 @@ void QGraphicsView::paintEvent(QPaintEvent *event) painter.restore(); } -#ifdef QGRAPHICSVIEW_DEBUG - int backgroundTime = stopWatch.elapsed() - exposedTime; -#endif - - if (!itemList.isEmpty()) { - // Generate the style options. - const int numItems = itemList.size(); - QGraphicsItem **itemArray = &itemList[0]; // Relies on QList internals, but is perfectly valid. - QStyleOptionGraphicsItem *styleOptionArray = d->allocStyleOptionsArray(numItems); - for (int i = 0; i < numItems; ++i) - itemArray[i]->d_ptr->initStyleOption(&styleOptionArray[i], viewTransform, exposedRegion, allItems); - // Draw the items. - drawItems(&painter, numItems, itemArray, styleOptionArray); - d->freeStyleOptionsArray(styleOptionArray); + // Items + if (!(d->optimizationFlags & IndirectPainting)) { + d->scene->d_func()->drawSubtreeRecursive(0, &painter, viewTransform, &d->exposedRegion, + viewport(), 0); + } else { + // Find all exposed items + bool allItems = false; + QList<QGraphicsItem *> itemList = d->findItems(d->exposedRegion, &allItems); + + if (!itemList.isEmpty()) { + // Generate the style options. + const int numItems = itemList.size(); + QGraphicsItem **itemArray = &itemList[0]; // Relies on QList internals, but is perfectly valid. + QStyleOptionGraphicsItem *styleOptionArray = d->allocStyleOptionsArray(numItems); + for (int i = 0; i < numItems; ++i) + itemArray[i]->d_ptr->initStyleOption(&styleOptionArray[i], viewTransform, d->exposedRegion, allItems); + // Draw the items. + drawItems(&painter, numItems, itemArray, styleOptionArray); + d->freeStyleOptionsArray(styleOptionArray); + } } -#ifdef QGRAPHICSVIEW_DEBUG - int itemsTime = stopWatch.elapsed() - exposedTime - backgroundTime; -#endif - // Foreground drawForeground(&painter, exposedSceneRect); -#ifdef QGRAPHICSVIEW_DEBUG - int foregroundTime = stopWatch.elapsed() - exposedTime - backgroundTime - itemsTime; -#endif - #ifndef QT_NO_RUBBERBAND // Rubberband if (d->rubberBanding && !d->rubberBandRect.isEmpty()) { @@ -3462,17 +3322,6 @@ void QGraphicsView::paintEvent(QPaintEvent *event) painter.end(); -#ifdef QGRAPHICSVIEW_DEBUG - qDebug() << "\tItem discovery....... " << exposedTime << "msecs (" << itemList.size() << "items," - << (exposedTime > 0 ? (itemList.size() * 1000.0 / exposedTime) : -1) << "/ sec )"; - qDebug() << "\tDrawing background... " << backgroundTime << "msecs (" << exposedRegion.numRects() << "segments )"; - qDebug() << "\tDrawing items........ " << itemsTime << "msecs (" - << (itemsTime > 0 ? (itemList.size() * 1000.0 / itemsTime) : -1) << "/ sec )"; - qDebug() << "\tDrawing foreground... " << foregroundTime << "msecs (" << exposedRegion.numRects() << "segments )"; - qDebug() << "\tTotal rendering time: " << stopWatch.elapsed() << "msecs (" - << (stopWatch.elapsed() > 0 ? (1000.0 / stopWatch.elapsed()) : -1.0) << "fps )"; -#endif - // Restore painter state protection. d->scene->d_func()->painterStateProtection = true; } @@ -3519,10 +3368,7 @@ void QGraphicsView::scrollContentsBy(int dx, int dy) if (d->viewportUpdateMode != QGraphicsView::NoViewportUpdate) { if (d->viewportUpdateMode != QGraphicsView::FullViewportUpdate) { - for (int i = 0; i < d->dirtyRects.size(); ++i) - d->dirtyRects[i].translate(dx, dy); - for (int i = 0; i < d->dirtyRegions.size(); ++i) - d->dirtyRegions[i].translate(dx, dy); + d->dirtyRegion.translate(dx, dy); if (d->accelerateScrolling) { #ifndef QT_NO_RUBBERBAND // Update new and old rubberband regions @@ -3656,8 +3502,10 @@ void QGraphicsView::drawItems(QPainter *painter, int numItems, const QStyleOptionGraphicsItem options[]) { Q_D(QGraphicsView); - if (d->scene) - d->scene->drawItems(painter, numItems, items, options, viewport()); + if (d->scene) { + QWidget *widget = painter->device() == viewport() ? viewport() : 0; + d->scene->drawItems(painter, numItems, items, options, widget); + } } /*! @@ -3686,6 +3534,18 @@ QTransform QGraphicsView::viewportTransform() const } /*! + Returns true if the view is transformed (i.e., a non-identity transform + has been assigned, or the scrollbars are adjusted). + + \sa setTransform(), horizontalScrollBar(), verticalScrollBar() +*/ +bool QGraphicsView::isTransformed() const +{ + Q_D(const QGraphicsView); + return !d->identityMatrix || d->horizontalScroll() || d->verticalScroll(); +} + +/*! Sets the view's current transformation matrix to \a matrix. If \a combine is true, then \a matrix is combined with the current matrix; |