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1 /* | 1 /* |
2 * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
reserved. | 2 * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
reserved. |
3 * | 3 * |
4 * Portions are Copyright (C) 1998 Netscape Communications Corporation. | 4 * Portions are Copyright (C) 1998 Netscape Communications Corporation. |
5 * | 5 * |
6 * Other contributors: | 6 * Other contributors: |
7 * Robert O'Callahan <roc+@cs.cmu.edu> | 7 * Robert O'Callahan <roc+@cs.cmu.edu> |
8 * David Baron <dbaron@fas.harvard.edu> | 8 * David Baron <dbaron@fas.harvard.edu> |
9 * Christian Biesinger <cbiesinger@gmail.com> | 9 * Christian Biesinger <cbiesinger@gmail.com> |
10 * Randall Jesup <rjesup@wgate.com> | 10 * Randall Jesup <rjesup@wgate.com> |
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635 // PaintLayerScrollableArea does not maintain that flag: it gets set, bu
t it never | 635 // PaintLayerScrollableArea does not maintain that flag: it gets set, bu
t it never |
636 // gets unset. We should unset the flag after layout. | 636 // gets unset. We should unset the flag after layout. |
637 scrollPositionChanged(scrollPositionDouble(), ProgrammaticScroll); | 637 scrollPositionChanged(scrollPositionDouble(), ProgrammaticScroll); |
638 } | 638 } |
639 | 639 |
640 m_scrollbarManager.setCanDetachScrollbars(false); | 640 m_scrollbarManager.setCanDetachScrollbars(false); |
641 | 641 |
642 bool hasHorizontalOverflow = this->hasHorizontalOverflow(); | 642 bool hasHorizontalOverflow = this->hasHorizontalOverflow(); |
643 bool hasVerticalOverflow = this->hasVerticalOverflow(); | 643 bool hasVerticalOverflow = this->hasVerticalOverflow(); |
644 | 644 |
| 645 // Don't add auto scrollbars if the box contents aren't visible. |
| 646 bool shouldHaveAutoHorizontalScrollbar = hasHorizontalOverflow && box().pixe
lSnappedClientHeight(); |
| 647 bool shouldHaveAutoVerticalScrollbar = hasVerticalOverflow && box().pixelSna
ppedClientWidth(); |
| 648 |
645 { | 649 { |
646 // Hits in compositing/overflow/automatically-opt-into-composited-scroll
ing-after-style-change.html. | 650 // Hits in compositing/overflow/automatically-opt-into-composited-scroll
ing-after-style-change.html. |
647 DisableCompositingQueryAsserts disabler; | 651 DisableCompositingQueryAsserts disabler; |
648 | 652 |
649 // overflow:scroll should just enable/disable. | 653 // overflow:scroll should just enable/disable. |
650 if (box().style()->overflowX() == OverflowScroll && horizontalScrollbar(
)) | 654 if (box().style()->overflowX() == OverflowScroll && horizontalScrollbar(
)) |
651 horizontalScrollbar()->setEnabled(hasHorizontalOverflow); | 655 horizontalScrollbar()->setEnabled(hasHorizontalOverflow); |
652 if (box().style()->overflowY() == OverflowScroll && verticalScrollbar()) | 656 if (box().style()->overflowY() == OverflowScroll && verticalScrollbar()) |
653 verticalScrollbar()->setEnabled(hasVerticalOverflow); | 657 verticalScrollbar()->setEnabled(hasVerticalOverflow); |
654 } | 658 } |
655 | 659 |
656 // We need to layout again if scrollbars are added or removed by overflow:au
to, | 660 // We need to layout again if scrollbars are added or removed by overflow:au
to, |
657 // or by changing between native and custom. | 661 // or by changing between native and custom. |
658 bool horizontalScrollBarChanged = (box().hasAutoHorizontalScrollbar() && (ha
sHorizontalScrollbar() != hasHorizontalOverflow)) | 662 bool horizontalScrollBarChanged = (box().hasAutoHorizontalScrollbar() && (ha
sHorizontalScrollbar() != shouldHaveAutoHorizontalScrollbar)) |
659 || (box().style()->overflowX() == OverflowScroll && !horizontalScrollbar
()); | 663 || (box().style()->overflowX() == OverflowScroll && !horizontalScrollbar
()); |
660 bool verticalScrollBarChanged = (box().hasAutoVerticalScrollbar() && (hasVer
ticalScrollbar() != hasVerticalOverflow)) | 664 bool verticalScrollBarChanged = (box().hasAutoVerticalScrollbar() && (hasVer
ticalScrollbar() != shouldHaveAutoVerticalScrollbar)) |
661 || (box().style()->overflowY() == OverflowScroll && !verticalScrollbar()
); | 665 || (box().style()->overflowY() == OverflowScroll && !verticalScrollbar()
); |
662 if (!visualViewportSuppliesScrollbars() && (horizontalScrollBarChanged || ve
rticalScrollBarChanged)) { | 666 if (!m_inOverflowRelayout |
| 667 && !visualViewportSuppliesScrollbars() |
| 668 && (horizontalScrollBarChanged || verticalScrollBarChanged)) { |
663 if (box().hasAutoHorizontalScrollbar()) | 669 if (box().hasAutoHorizontalScrollbar()) |
664 setHasHorizontalScrollbar(hasHorizontalOverflow); | 670 setHasHorizontalScrollbar(shouldHaveAutoHorizontalScrollbar); |
665 else if (box().style()->overflowX() == OverflowScroll) | 671 else if (box().style()->overflowX() == OverflowScroll) |
666 setHasHorizontalScrollbar(true); | 672 setHasHorizontalScrollbar(true); |
667 if (box().hasAutoVerticalScrollbar()) | 673 if (box().hasAutoVerticalScrollbar()) |
668 setHasVerticalScrollbar(hasVerticalOverflow); | 674 setHasVerticalScrollbar(shouldHaveAutoVerticalScrollbar); |
669 else if (box().style()->overflowY() == OverflowScroll) | 675 else if (box().style()->overflowY() == OverflowScroll) |
670 setHasVerticalScrollbar(true); | 676 setHasVerticalScrollbar(true); |
671 | 677 |
672 if (hasVerticalOverflow || hasHorizontalOverflow) | 678 if (hasScrollbar()) |
673 updateScrollCornerStyle(); | 679 updateScrollCornerStyle(); |
674 | 680 |
675 layer()->updateSelfPaintingLayer(); | 681 layer()->updateSelfPaintingLayer(); |
676 | 682 |
677 // Force an update since we know the scrollbars have changed things. | 683 // Force an update since we know the scrollbars have changed things. |
678 if (box().document().hasAnnotatedRegions()) | 684 if (box().document().hasAnnotatedRegions()) |
679 box().document().setAnnotatedRegionsDirty(true); | 685 box().document().setAnnotatedRegionsDirty(true); |
680 | 686 |
681 // Our proprietary overflow: overlay value doesn't trigger a layout. | 687 // Our proprietary overflow: overlay value doesn't trigger a layout. |
682 if ((horizontalScrollBarChanged && box().style()->overflowX() != Overflo
wOverlay) || (verticalScrollBarChanged && box().style()->overflowY() != Overflow
Overlay)) { | 688 if ((horizontalScrollBarChanged && box().style()->overflowX() != Overflo
wOverlay) || (verticalScrollBarChanged && box().style()->overflowY() != Overflow
Overlay)) { |
683 if (!m_inOverflowRelayout) { | 689 if ((verticalScrollBarChanged && box().isHorizontalWritingMode()) |
| 690 || (horizontalScrollBarChanged && !box().isHorizontalWritingMode
())) { |
| 691 box().setPreferredLogicalWidthsDirty(); |
| 692 } |
| 693 if (delayedLayoutScope) { |
| 694 box().updateLogicalWidth(); |
| 695 if (box().isLayoutBlock()) |
| 696 toLayoutBlock(box()).scrollbarsChanged(horizontalScrollBarCh
anged, verticalScrollBarChanged); |
| 697 delayedLayoutScope->setNeedsLayout(&box(), LayoutInvalidationRea
son::ScrollbarChanged); |
| 698 didMarkForDelayedLayout = true; |
| 699 } else { |
684 m_inOverflowRelayout = true; | 700 m_inOverflowRelayout = true; |
685 if (delayedLayoutScope) { | 701 SubtreeLayoutScope layoutScope(box()); |
686 if (box().isLayoutBlock()) | 702 layoutScope.setNeedsLayout(&box(), LayoutInvalidationReason::Scr
ollbarChanged); |
687 toLayoutBlock(box()).scrollbarsChanged(horizontalScrollB
arChanged, verticalScrollBarChanged); | 703 if (box().isLayoutBlock()) { |
688 delayedLayoutScope->setNeedsLayout(&box(), LayoutInvalidatio
nReason::ScrollbarChanged); | 704 LayoutBlock& block = toLayoutBlock(box()); |
689 didMarkForDelayedLayout = true; | 705 block.scrollbarsChanged(horizontalScrollBarChanged, vertical
ScrollBarChanged); |
| 706 block.layoutBlock(true); |
690 } else { | 707 } else { |
691 SubtreeLayoutScope layoutScope(box()); | 708 box().layout(); |
692 layoutScope.setNeedsLayout(&box(), LayoutInvalidationReason:
:ScrollbarChanged); | |
693 if (box().isLayoutBlock()) { | |
694 LayoutBlock& block = toLayoutBlock(box()); | |
695 block.scrollbarsChanged(horizontalScrollBarChanged, vert
icalScrollBarChanged); | |
696 block.layoutBlock(true); | |
697 } else { | |
698 box().layout(); | |
699 } | |
700 } | 709 } |
701 LayoutObject* parent = box().parent(); | |
702 if (parent && parent->isFlexibleBox()) | |
703 toLayoutFlexibleBox(parent)->clearCachedMainSizeForChild(box
()); | |
704 m_inOverflowRelayout = false; | 710 m_inOverflowRelayout = false; |
705 } | 711 } |
| 712 LayoutObject* parent = box().parent(); |
| 713 if (parent && parent->isFlexibleBox()) |
| 714 toLayoutFlexibleBox(parent)->clearCachedMainSizeForChild(box()); |
706 } | 715 } |
707 } | 716 } |
708 | 717 |
709 { | 718 { |
710 // Hits in compositing/overflow/automatically-opt-into-composited-scroll
ing-after-style-change.html. | 719 // Hits in compositing/overflow/automatically-opt-into-composited-scroll
ing-after-style-change.html. |
711 DisableCompositingQueryAsserts disabler; | 720 DisableCompositingQueryAsserts disabler; |
712 | 721 |
713 // Set up the range (and page step/line step). | 722 // Set up the range (and page step/line step). |
714 if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) { | 723 if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) { |
715 int clientWidth = box().pixelSnappedClientWidth(); | 724 int clientWidth = box().pixelSnappedClientWidth(); |
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1439 if (!layer->scrollsOverflow()) | 1448 if (!layer->scrollsOverflow()) |
1440 return false; | 1449 return false; |
1441 | 1450 |
1442 Node* node = layer->enclosingNode(); | 1451 Node* node = layer->enclosingNode(); |
1443 if (node && node->isElementNode() && (toElement(node)->compositorMutableProp
erties() & (CompositorMutableProperty::kScrollTop | CompositorMutableProperty::k
ScrollLeft))) | 1452 if (node && node->isElementNode() && (toElement(node)->compositorMutableProp
erties() & (CompositorMutableProperty::kScrollTop | CompositorMutableProperty::k
ScrollLeft))) |
1444 return true; | 1453 return true; |
1445 | 1454 |
1446 if (mode == PaintLayerScrollableArea::ConsiderLCDText && !layer->compositor(
)->preferCompositingToLCDTextEnabled()) | 1455 if (mode == PaintLayerScrollableArea::ConsiderLCDText && !layer->compositor(
)->preferCompositingToLCDTextEnabled()) |
1447 return false; | 1456 return false; |
1448 | 1457 |
1449 return !layer->hasDescendantWithClipPath() | 1458 return !layer->size().isEmpty() |
| 1459 && !layer->hasDescendantWithClipPath() |
1450 && !layer->hasAncestorWithClipPath() | 1460 && !layer->hasAncestorWithClipPath() |
1451 && !layer->layoutObject()->style()->hasBorderRadius(); | 1461 && !layer->layoutObject()->style()->hasBorderRadius(); |
1452 } | 1462 } |
1453 | 1463 |
1454 void PaintLayerScrollableArea::updateNeedsCompositedScrolling(LCDTextMode mode) | 1464 void PaintLayerScrollableArea::updateNeedsCompositedScrolling(LCDTextMode mode) |
1455 { | 1465 { |
1456 const bool needsCompositedScrolling = layerNeedsCompositedScrolling(mode, la
yer()); | 1466 const bool needsCompositedScrolling = layerNeedsCompositedScrolling(mode, la
yer()); |
1457 if (static_cast<bool>(m_needsCompositedScrolling) != needsCompositedScrollin
g) { | 1467 if (static_cast<bool>(m_needsCompositedScrolling) != needsCompositedScrollin
g) { |
1458 m_needsCompositedScrolling = needsCompositedScrolling; | 1468 m_needsCompositedScrolling = needsCompositedScrolling; |
1459 layer()->didUpdateNeedsCompositedScrolling(); | 1469 layer()->didUpdateNeedsCompositedScrolling(); |
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1611 } | 1621 } |
1612 | 1622 |
1613 DEFINE_TRACE(PaintLayerScrollableArea::ScrollbarManager) | 1623 DEFINE_TRACE(PaintLayerScrollableArea::ScrollbarManager) |
1614 { | 1624 { |
1615 visitor->trace(m_scrollableArea); | 1625 visitor->trace(m_scrollableArea); |
1616 visitor->trace(m_hBar); | 1626 visitor->trace(m_hBar); |
1617 visitor->trace(m_vBar); | 1627 visitor->trace(m_vBar); |
1618 } | 1628 } |
1619 | 1629 |
1620 } // namespace blink | 1630 } // namespace blink |
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