| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com) |
| * (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com) |
| * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. |
| * Copyright (C) 2010, 2012 Google Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "config.h" |
| #include "RenderLayerModelObject.h" |
| |
| #include "RenderLayer.h" |
| #include "RenderLayerCompositor.h" |
| #include "RenderView.h" |
| #include "Settings.h" |
| |
| namespace WebCore { |
| |
| bool RenderLayerModelObject::s_wasFloating = false; |
| bool RenderLayerModelObject::s_hadLayer = false; |
| bool RenderLayerModelObject::s_hadTransform = false; |
| bool RenderLayerModelObject::s_layerWasSelfPainting = false; |
| |
| RenderLayerModelObject::RenderLayerModelObject(Element& element, RenderStyle&& style, BaseTypeFlags baseTypeFlags) |
| : RenderElement(element, WTFMove(style), baseTypeFlags | RenderLayerModelObjectFlag) |
| { |
| } |
| |
| RenderLayerModelObject::RenderLayerModelObject(Document& document, RenderStyle&& style, BaseTypeFlags baseTypeFlags) |
| : RenderElement(document, WTFMove(style), baseTypeFlags | RenderLayerModelObjectFlag) |
| { |
| } |
| |
| RenderLayerModelObject::~RenderLayerModelObject() |
| { |
| if (isPositioned()) { |
| if (style().hasViewportConstrainedPosition()) |
| view().frameView().removeViewportConstrainedObject(this); |
| } |
| |
| // Our layer should have been destroyed and cleared by now |
| ASSERT(!hasLayer()); |
| ASSERT(!m_layer); |
| } |
| |
| void RenderLayerModelObject::destroyLayer() |
| { |
| ASSERT(!hasLayer()); // Callers should have already called setHasLayer(false) |
| ASSERT(m_layer); |
| m_layer = nullptr; |
| } |
| |
| void RenderLayerModelObject::createLayer() |
| { |
| ASSERT(!m_layer); |
| m_layer = std::make_unique<RenderLayer>(*this); |
| setHasLayer(true); |
| m_layer->insertOnlyThisLayer(); |
| } |
| |
| bool RenderLayerModelObject::hasSelfPaintingLayer() const |
| { |
| return m_layer && m_layer->isSelfPaintingLayer(); |
| } |
| |
| void RenderLayerModelObject::styleWillChange(StyleDifference diff, const RenderStyle& newStyle) |
| { |
| s_wasFloating = isFloating(); |
| s_hadLayer = hasLayer(); |
| s_hadTransform = hasTransform(); |
| if (s_hadLayer) |
| s_layerWasSelfPainting = layer()->isSelfPaintingLayer(); |
| |
| // If our z-index changes value or our visibility changes, |
| // we need to dirty our stacking context's z-order list. |
| const RenderStyle* oldStyle = hasInitializedStyle() ? &style() : nullptr; |
| if (oldStyle) { |
| if (parent()) { |
| // Do a repaint with the old style first, e.g., for example if we go from |
| // having an outline to not having an outline. |
| if (diff == StyleDifferenceRepaintLayer) { |
| layer()->repaintIncludingDescendants(); |
| if (!(oldStyle->clip() == newStyle.clip())) |
| layer()->clearClipRectsIncludingDescendants(); |
| } else if (diff == StyleDifferenceRepaint || newStyle.outlineSize() < oldStyle->outlineSize()) |
| repaint(); |
| } |
| |
| if (diff == StyleDifferenceLayout || diff == StyleDifferenceSimplifiedLayout) { |
| // When a layout hint happens, we do a repaint of the layer, since the layer could end up being destroyed. |
| if (hasLayer()) { |
| if (oldStyle->position() != newStyle.position() |
| || oldStyle->zIndex() != newStyle.zIndex() |
| || oldStyle->hasAutoZIndex() != newStyle.hasAutoZIndex() |
| || !(oldStyle->clip() == newStyle.clip()) |
| || oldStyle->hasClip() != newStyle.hasClip() |
| || oldStyle->opacity() != newStyle.opacity() |
| || oldStyle->transform() != newStyle.transform() |
| || oldStyle->filter() != newStyle.filter() |
| ) |
| layer()->repaintIncludingDescendants(); |
| } else if (newStyle.hasTransform() || newStyle.opacity() < 1 || newStyle.hasFilter() || newStyle.hasBackdropFilter()) { |
| // If we don't have a layer yet, but we are going to get one because of transform or opacity, |
| // then we need to repaint the old position of the object. |
| repaint(); |
| } |
| } |
| } |
| |
| RenderElement::styleWillChange(diff, newStyle); |
| } |
| |
| #if ENABLE(CSS_SCROLL_SNAP) |
| static bool scrollSnapContainerRequiresUpdateForStyleUpdate(const RenderStyle& oldStyle, const RenderStyle& newStyle) |
| { |
| return !(oldStyle.scrollSnapType() == newStyle.scrollSnapType() |
| && oldStyle.scrollSnapPointsX() == newStyle.scrollSnapPointsX() |
| && oldStyle.scrollSnapPointsY() == newStyle.scrollSnapPointsY() |
| && oldStyle.scrollSnapDestination() == newStyle.scrollSnapDestination()); |
| } |
| #endif |
| |
| void RenderLayerModelObject::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) |
| { |
| RenderElement::styleDidChange(diff, oldStyle); |
| updateFromStyle(); |
| |
| if (requiresLayer()) { |
| if (!layer() && layerCreationAllowedForSubtree()) { |
| if (s_wasFloating && isFloating()) |
| setChildNeedsLayout(); |
| createLayer(); |
| if (parent() && !needsLayout() && containingBlock()) { |
| layer()->setRepaintStatus(NeedsFullRepaint); |
| // There is only one layer to update, it is not worth using |cachedOffset| since |
| // we are not sure the value will be used. |
| layer()->updateLayerPositions(0); |
| } |
| } |
| } else if (layer() && layer()->parent()) { |
| #if ENABLE(CSS_COMPOSITING) |
| if (oldStyle->hasBlendMode()) |
| layer()->parent()->dirtyAncestorChainHasBlendingDescendants(); |
| #endif |
| setHasTransformRelatedProperty(false); // All transform-related propeties force layers, so we know we don't have one or the object doesn't support them. |
| setHasReflection(false); |
| // Repaint the about to be destroyed self-painting layer when style change also triggers repaint. |
| if (layer()->isSelfPaintingLayer() && layer()->repaintStatus() == NeedsFullRepaint && layer()->hasComputedRepaintRect()) |
| repaintUsingContainer(containerForRepaint(), layer()->repaintRect()); |
| layer()->removeOnlyThisLayer(); // calls destroyLayer() which clears m_layer |
| if (s_wasFloating && isFloating()) |
| setChildNeedsLayout(); |
| if (s_hadTransform) |
| setNeedsLayoutAndPrefWidthsRecalc(); |
| } |
| |
| if (layer()) { |
| layer()->styleChanged(diff, oldStyle); |
| if (s_hadLayer && layer()->isSelfPaintingLayer() != s_layerWasSelfPainting) |
| setChildNeedsLayout(); |
| } |
| |
| bool newStyleIsViewportConstrained = style().hasViewportConstrainedPosition(); |
| bool oldStyleIsViewportConstrained = oldStyle && oldStyle->hasViewportConstrainedPosition(); |
| if (newStyleIsViewportConstrained != oldStyleIsViewportConstrained) { |
| if (newStyleIsViewportConstrained && layer()) |
| view().frameView().addViewportConstrainedObject(this); |
| else |
| view().frameView().removeViewportConstrainedObject(this); |
| } |
| |
| #if ENABLE(CSS_SCROLL_SNAP) |
| const RenderStyle& newStyle = style(); |
| if (oldStyle && scrollSnapContainerRequiresUpdateForStyleUpdate(*oldStyle, newStyle)) { |
| if (RenderLayer* renderLayer = layer()) { |
| renderLayer->updateSnapOffsets(); |
| renderLayer->updateScrollSnapState(); |
| } else if (isBody() || isDocumentElementRenderer()) { |
| FrameView& frameView = view().frameView(); |
| frameView.updateSnapOffsets(); |
| frameView.updateScrollSnapState(); |
| frameView.updateScrollingCoordinatorScrollSnapProperties(); |
| } |
| } |
| if (oldStyle && oldStyle->scrollSnapCoordinates() != newStyle.scrollSnapCoordinates()) { |
| const RenderBox* scrollSnapBox = enclosingBox().findEnclosingScrollableContainer(); |
| if (scrollSnapBox && scrollSnapBox->layer()) { |
| const RenderStyle& style = scrollSnapBox->style(); |
| if (style.scrollSnapType() != ScrollSnapType::None) { |
| scrollSnapBox->layer()->updateSnapOffsets(); |
| scrollSnapBox->layer()->updateScrollSnapState(); |
| if (scrollSnapBox->isBody() || scrollSnapBox->isDocumentElementRenderer()) |
| scrollSnapBox->view().frameView().updateScrollingCoordinatorScrollSnapProperties(); |
| } |
| } |
| } |
| #endif |
| } |
| |
| bool RenderLayerModelObject::shouldPlaceBlockDirectionScrollbarOnLeft() const |
| { |
| // RTL Scrollbars require some system support, and this system support does not exist on certain versions of OS X. iOS uses a separate mechanism. |
| #if PLATFORM(IOS) || (PLATFORM(MAC) && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200) |
| return false; |
| #else |
| switch (frame().settings().userInterfaceDirectionPolicy()) { |
| case UserInterfaceDirectionPolicy::Content: |
| return style().shouldPlaceBlockDirectionScrollbarOnLeft(); |
| case UserInterfaceDirectionPolicy::System: |
| return frame().settings().systemLayoutDirection() == RTL; |
| } |
| ASSERT_NOT_REACHED(); |
| return style().shouldPlaceBlockDirectionScrollbarOnLeft(); |
| #endif |
| } |
| |
| } // namespace WebCore |
| |
